Coastal conglomerates around the Hadjer el Khamis inselbergs (western Chad, central Africa): new evidence for Lake Mega-Chad episodes
This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega‐Chad events. Field observations have shown that: (1) conglomeratic patches of immature to mature clasts are preserved at the feet of the Hadjer el Khamis inselbergs; (2)...
Saved in:
Published in | Earth surface processes and landforms Vol. 28; no. 10; pp. 1059 - 1069 |
---|---|
Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Chichester, UK
John Wiley & Sons, Ltd
15.09.2003
Wiley |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Abstract | This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega‐Chad events. Field observations have shown that: (1) conglomeratic patches of immature to mature clasts are preserved at the feet of the Hadjer el Khamis inselbergs; (2) in cross‐section, their profile reveals a well defined cliff–platform junction at a constant elevation (325 m). The monolithological clasts show all degrees of roundness, from angular cobbles to well rounded pebbles. This wide range of maturity suggests a coastal origin for these cobbles. The system was permanently fed with angular clasts, which were progressively worn by waves. Cobbles that were wave‐worked for the longest time are the best rounded. The cliff–platform junction is the result of erosion by waves, which attacked and undercut the inselberg cliffs during Lake Mega‐Chad events. Asymmetrical erosion profiles moreover suggest a wind regime dominated by SW to NE oriented winds. These interpretations have two implications. The elevation of the cliff–platform junction is an indication of the highest water level of Lake Mega‐Chad at 320–325 m, which is in agreement with other observations elsewhere in the basin. The SW to NE oriented winds show that monsoon‐related winds were prevalent during Lake Mega‐Chad events, suggesting the Inter‐Tropical Convergence Zone was located higher in latitude than today. Copyright © 2003 John Wiley & Sons, Ltd. |
---|---|
AbstractList | Abstract
This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega‐Chad events. Field observations have shown that: (1) conglomeratic patches of immature to mature clasts are preserved at the feet of the Hadjer el Khamis inselbergs; (2) in cross‐section, their profile reveals a well defined cliff–platform junction at a constant elevation (325 m). The monolithological clasts show all degrees of roundness, from angular cobbles to well rounded pebbles. This wide range of maturity suggests a coastal origin for these cobbles. The system was permanently fed with angular clasts, which were progressively worn by waves. Cobbles that were wave‐worked for the longest time are the best rounded. The cliff–platform junction is the result of erosion by waves, which attacked and undercut the inselberg cliffs during Lake Mega‐Chad events. Asymmetrical erosion profiles moreover suggest a wind regime dominated by SW to NE oriented winds. These interpretations have two implications. The elevation of the cliff–platform junction is an indication of the highest water level of Lake Mega‐Chad at 320–325 m, which is in agreement with other observations elsewhere in the basin. The SW to NE oriented winds show that monsoon‐related winds were prevalent during Lake Mega‐Chad events, suggesting the Inter‐Tropical Convergence Zone was located higher in latitude than today. Copyright © 2003 John Wiley & Sons, Ltd. This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega-Chad events. Field observations have shown that: (1) conglomeratic patches of immature to mature clasts are preserved at the feet of the Hadjer el Khamis inselbergs; (2) in cross-section, their profile reveals a well defined cliff-platform junction at a constant elevation (325 m). The monolithological clasts show all degrees of roundness, from angular cobbles to well rounded pebbles. This wide range of maturity suggests a coastal origin for these cobbles. The system was permanently fed with angular clasts, which were progressively worn by waves. Cobbles that were wave-worked for the longest time are the best rounded. The cliff-platform junction is the result of erosion by waves, which attacked and undercut the inselberg cliffs during Lake Mega-Chad events. Asymmetrical erosion profiles moreover suggest a wind regime dominated by SW to NE oriented winds. These interpretations have two implications. The elevation of the cliff-platform junction is an indication of the highest water level of Lake Mega-Chad at 320- 325 m, which is in agreement with other observations elsewhere in the basin. The SW to NE oriented winds show that monsoon-related winds were prevalent during Lake Mega-Chad events, suggesting the Inter-Tropical Convergence Zone was located higher in latitude than today. This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega‐Chad events. Field observations have shown that: (1) conglomeratic patches of immature to mature clasts are preserved at the feet of the Hadjer el Khamis inselbergs; (2) in cross‐section, their profile reveals a well defined cliff–platform junction at a constant elevation (325 m). The monolithological clasts show all degrees of roundness, from angular cobbles to well rounded pebbles. This wide range of maturity suggests a coastal origin for these cobbles. The system was permanently fed with angular clasts, which were progressively worn by waves. Cobbles that were wave‐worked for the longest time are the best rounded. The cliff–platform junction is the result of erosion by waves, which attacked and undercut the inselberg cliffs during Lake Mega‐Chad events. Asymmetrical erosion profiles moreover suggest a wind regime dominated by SW to NE oriented winds. These interpretations have two implications. The elevation of the cliff–platform junction is an indication of the highest water level of Lake Mega‐Chad at 320–325 m, which is in agreement with other observations elsewhere in the basin. The SW to NE oriented winds show that monsoon‐related winds were prevalent during Lake Mega‐Chad events, suggesting the Inter‐Tropical Convergence Zone was located higher in latitude than today. Copyright © 2003 John Wiley & Sons, Ltd. |
Author | Duringer, Philippe Ghienne, Jean-Francois Schuster, Mathieu Mackaye, Hassan Taisso Brunet, Michel Beauvilain, Alain Vignaud, Patrick |
Author_xml | – sequence: 1 givenname: Mathieu surname: Schuster fullname: Schuster, Mathieu email: schuster@illite.u-strasbg.fr organization: Ecole et Observatoire des Sciences de la Terre (EOST), Centre de Géochimie de la Surface (CNRS, UMR 7517), 1 rue Blessig, 67084 Strasbourg Cedex, France – sequence: 2 givenname: Philippe surname: Duringer fullname: Duringer, Philippe organization: Ecole et Observatoire des Sciences de la Terre (EOST), Centre de Géochimie de la Surface (CNRS, UMR 7517), 1 rue Blessig, 67084 Strasbourg Cedex, France – sequence: 3 givenname: Jean-Francois surname: Ghienne fullname: Ghienne, Jean-Francois organization: Ecole et Observatoire des Sciences de la Terre (EOST), Centre de Géochimie de la Surface (CNRS, UMR 7517), 1 rue Blessig, 67084 Strasbourg Cedex, France – sequence: 4 givenname: Patrick surname: Vignaud fullname: Vignaud, Patrick organization: Université de Poitiers, Laboratoire de Géobiologie, Biochronologie et Paléontologie Humaine, UMR 6046, 40 av. Recteur Pineau, 86022 Poitiers Cedex, France – sequence: 5 givenname: Alain surname: Beauvilain fullname: Beauvilain, Alain organization: Centre National d'Appui à la Recherche, BP 1228, N'Djaména, Tchad – sequence: 6 givenname: Hassan Taisso surname: Mackaye fullname: Mackaye, Hassan Taisso organization: Université de Poitiers, Laboratoire de Géobiologie, Biochronologie et Paléontologie Humaine, UMR 6046, 40 av. Recteur Pineau, 86022 Poitiers Cedex, France – sequence: 7 givenname: Michel surname: Brunet fullname: Brunet, Michel organization: Université de Poitiers, Laboratoire de Géobiologie, Biochronologie et Paléontologie Humaine, UMR 6046, 40 av. Recteur Pineau, 86022 Poitiers Cedex, France |
BackLink | http://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=15171098$$DView record in Pascal Francis https://hal.science/hal-03058810$$DView record in HAL |
BookMark | eNp1kctOWzEQhq2KSg2h6it40wsqh9rnbnZRCklFepHaqktr8BknBsdO7RMCD9D3xtFBdMVqpJlvPunXf0gOnHdIyBvOTjlj-SeMm9OK5S_IiDNRZ6ItmgMyYlw0mSiK5hU5jPGaMc7LVozIv6mH2IOlyrul9WsM0GOkEPzWdbRfIZ1Dd42BoqWXK1ibSI2LaK8wLCP9sMPYY3B0uoLuhCp0fUiuiQ5GwfEZdbijeGs6dAqp9oEu4AbpV1xCtv-guDHRdxiPyEsNNuLrxzkmvy_Of03n2eL77Mt0ssig5FWeoa40VNh0aZQtb3iuGeY8nToucl2LsrzqCs3rYr8pG2SqxQpqrnhRNS0UY3I8eFdg5SaYNYR76cHI-WQh9ztWsKptObvliX03sJvg_25TTpnCK7QWHPptlLxlZSnqPIHvB1AFH2NA_WTmTO4rkakSmSpJ5NtHJUQFVgdwysT_eJUisVTYmHwcuJ2xeP-cTp7__DFYs4E2qYu7JxrCjayboqnkn28zKfLZxedclCnhAwlsqOY |
CODEN | ESPLDB |
CitedBy_id | crossref_primary_10_1007_s10933_016_9894_2 crossref_primary_10_1016_j_geomorph_2021_107896 crossref_primary_10_1016_j_yqres_2009_10_010 crossref_primary_10_1016_j_crte_2009_08_006 crossref_primary_10_1080_00359190909519236 crossref_primary_10_1016_j_palaeo_2005_07_016 crossref_primary_10_1016_j_quascirev_2005_02_001 crossref_primary_10_1016_j_palaeo_2007_03_029 crossref_primary_10_1016_j_palaeo_2006_01_003 crossref_primary_10_3390_jmse10091300 crossref_primary_10_1002_2016GC006298 crossref_primary_10_1016_j_quaint_2014_04_065 crossref_primary_10_4236_ijg_2017_812085 crossref_primary_10_1016_j_quascirev_2021_107318 crossref_primary_10_5194_cp_9_1417_2013 crossref_primary_10_1016_j_crte_2009_04_001 crossref_primary_10_1080_01431161003786016 crossref_primary_10_1016_j_jafrearsci_2023_105016 crossref_primary_10_1016_j_jhydrol_2011_04_023 crossref_primary_10_1093_gji_ggx074 crossref_primary_10_1007_s00382_020_05188_4 crossref_primary_10_3390_w12113180 crossref_primary_10_4236_jgis_2021_135031 crossref_primary_10_1073_pnas_0711850106 |
Cites_doi | 10.1016/S1040-6182(01)00063-5 10.1093/oso/9780198233534.001.0001 10.1016/0040-1951(92)90260-D 10.1029/JB092iB11p11493 10.1016/S0025-3227(00)00013-X 10.1016/0025-3227(88)90121-1 10.1002/esp.255 10.1002/9781444304015.ch21 10.1016/S0264-3707(98)00032-5 10.1038/269573a0 10.1016/0169-555X(94)00080-B |
ContentType | Journal Article |
Copyright | Copyright © 2003 John Wiley & Sons, Ltd. Distributed under a Creative Commons Attribution 4.0 International License |
Copyright_xml | – notice: Copyright © 2003 John Wiley & Sons, Ltd. – notice: Distributed under a Creative Commons Attribution 4.0 International License |
DBID | BSCLL IQODW AAYXX CITATION F1W H96 L.G 1XC |
DOI | 10.1002/esp.502 |
DatabaseName | Istex Pascal-Francis CrossRef ASFA: Aquatic Sciences and Fisheries Abstracts Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources Aquatic Science & Fisheries Abstracts (ASFA) Professional Hyper Article en Ligne (HAL) |
DatabaseTitle | CrossRef Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources Aquatic Science & Fisheries Abstracts (ASFA) Professional ASFA: Aquatic Sciences and Fisheries Abstracts |
DatabaseTitleList | CrossRef Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources |
DeliveryMethod | fulltext_linktorsrc |
Discipline | Geography Geology |
EISSN | 1096-9837 |
EndPage | 1069 |
ExternalDocumentID | oai_HAL_hal_03058810v1 10_1002_esp_502 15171098 ESP502 ark_67375_WNG_92GFD294_0 |
Genre | article |
GeographicLocations | Chad West Africa Africa |
GeographicLocations_xml | – name: Africa |
GrantInformation_xml | – fundername: Ministère Tchadien de l'Enseignement Supérieur et de la Recherche – fundername: French Ministère des Affaires Etrangères – fundername: Centre National d'Appui de la Recherche (CNAR) – fundername: Centre National de la Recherche Scientifique (CNRS) |
GroupedDBID | -DZ -~X .3N .GA .Y3 05W 0R~ 10A 1L6 1OB 1OC 1ZS 31~ 33P 3SF 3WU 4.4 4ZD 50Y 50Z 51W 51X 52M 52N 52O 52P 52S 52T 52U 52W 52X 5GY 5VS 66C 702 7PT 8-0 8-1 8-3 8-4 8-5 8UM 930 A03 AAESR AAEVG AAHHS AANLZ AAONW AASGY AAXRX AAZKR ABCQN ABCUV ABHUG ABIJN ABJNI ABPVW ABTAH ABWRO ACAHQ ACBWZ ACCFJ ACCZN ACFBH ACGFS ACIWK ACPOU ACSMX ACXBN ACXME ACXQS ADAWD ADBBV ADDAD ADEOM ADIZJ ADKYN ADMGS ADOZA ADXAS ADZMN ADZOD AEEZP AEIGN AEIMD AENEX AEQDE AEUQT AEUYR AFBPY AFFPM AFGKR AFPWT AFRAH AFVGU AFZJQ AGJLS AHBTC AIURR AIWBW AJBDE AJXKR ALAGY ALMA_UNASSIGNED_HOLDINGS ALUQN AMBMR AMYDB ATUGU AUFTA AZBYB AZFZN AZVAB BAFTC BDRZF BFHJK BHBCM BMNLL BMXJE BNHUX BROTX BRXPI BSCLL BY8 CS3 D-E D-F DCZOG DPXWK DR2 DRFUL DRSTM DU5 EBS EJD F00 F01 F04 FEDTE G-S G.N GNP GODZA H.T H.X HBH HHY HVGLF HZ~ IX1 J0M JPC KQQ LATKE LAW LC2 LC3 LEEKS LH4 LITHE LOXES LP6 LP7 LUTES LW6 LYRES MEWTI MK4 MRFUL MRSTM MSFUL MSSTM MXFUL MXSTM N04 N05 N9A NF~ NNB O66 O9- OHT P2P P2W P2X P4D PALCI Q.N Q11 QB0 QRW R.K ROL RWI RX1 SUPJJ UB1 V2E W8V W99 WBKPD WH7 WIB WIH WIK WOHZO WQJ WRC WUPDE WWD WXSBR WYISQ XG1 XKC XPP XV2 ZY4 ZZTAW ~02 ~IA ~WT AAHBH AITYG HGLYW OIG AAPBV ABEFU ABEML ACSCC AFFNX AI. C45 DDYGU HF~ IQODW M62 OVD RIWAO RJQFR RYL SAMSI TEORI VH1 AAYXX CITATION F1W H96 L.G 1XC |
ID | FETCH-LOGICAL-a4152-ef5fa5e7d5fa481712f0e21152d192f6944bd3f16352d147e0c8e5a61c13578a3 |
IEDL.DBID | DR2 |
ISSN | 0197-9337 |
IngestDate | Fri Sep 06 12:17:22 EDT 2024 Fri Aug 16 23:26:49 EDT 2024 Fri Aug 23 01:57:24 EDT 2024 Sun Oct 22 16:03:44 EDT 2023 Sat Aug 24 00:49:11 EDT 2024 Wed Jan 17 05:02:23 EST 2024 |
IsPeerReviewed | true |
IsScholarly | true |
Issue | 10 |
Keywords | sedimentary rocks inselbergs paleolimnology Africa lake level conglomerate littoral erosion clastic rocks |
Language | English |
License | CC BY 4.0 Distributed under a Creative Commons Attribution 4.0 International License: http://creativecommons.org/licenses/by/4.0 |
LinkModel | DirectLink |
MergedId | FETCHMERGED-LOGICAL-a4152-ef5fa5e7d5fa481712f0e21152d192f6944bd3f16352d147e0c8e5a61c13578a3 |
Notes | Ministère Tchadien de l'Enseignement Supérieur et de la Recherche ark:/67375/WNG-92GFD294-0 Centre National de la Recherche Scientifique (CNRS) istex:CB4C2A93EA13DFA259A07B3C2189E46DF576151F Centre National d'Appui de la Recherche (CNAR) ArticleID:ESP502 French Ministère des Affaires Etrangères ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ORCID | 0000-0002-4196-8953 0000-0001-6213-5726 |
PQID | 18044962 |
PQPubID | 23462 |
PageCount | 11 |
ParticipantIDs | hal_primary_oai_HAL_hal_03058810v1 proquest_miscellaneous_18044962 crossref_primary_10_1002_esp_502 pascalfrancis_primary_15171098 wiley_primary_10_1002_esp_502_ESP502 istex_primary_ark_67375_WNG_92GFD294_0 |
PublicationCentury | 2000 |
PublicationDate | 15 September 2003 |
PublicationDateYYYYMMDD | 2003-09-15 |
PublicationDate_xml | – month: 09 year: 2003 text: 15 September 2003 day: 15 |
PublicationDecade | 2000 |
PublicationPlace | Chichester, UK |
PublicationPlace_xml | – name: Chichester, UK – name: Chichester |
PublicationTitle | Earth surface processes and landforms |
PublicationTitleAlternate | Earth Surf. Process. Landforms |
PublicationYear | 2003 |
Publisher | John Wiley & Sons, Ltd Wiley |
Publisher_xml | – name: John Wiley & Sons, Ltd – name: Wiley |
References | Schneider JL. 1989. Géologie et hydrologie de la République de Tchad. Thesis, University of Avignon. Mainguet M, Chemin MC. 1990. Le massif du Tibesti dans le système éolien du Sahara. Réflexion sur la génèse du lac Tchad. Berliner geographische Studien 30: 261- 276. Trenhaile AS. 1997. Coastal Dynamics and Landforms. Oxford University Press: Oxford. Duringer P. 1997. Dynamics of graben shoulder fan-deltas and rift lakes. The example of the upper Rhine Graben (Lower Tertiary, eastern France, southwestern Germany). 18th IAS Regional European Meeting of Sedimentology, Heidelberg. Excursion B7, September 2-4, Gaea heidelbergensis 4: 159- 168. Prothero DR, Schwab F. 1997. Sedimentary Geology. An Introduction to Sedimentary Rocks and Stratigraphy. W.H. Freeman: New York. Ghienne JF, Schuster M, Bernard A, Duringer P, Brunet M. 2002. The Holocene giant Lake Chad revealed by digital elevation models. Quaternary International 87: 81- 85. L'Homer A, Courbouleix S, Chantraine J, Deroin JP, Bonno-Courtois C, Caline B, Ehrhold A, Lautridou JP, Morzadec-Kerfourn MT. 1999. Notice explicative de la Carte géologique de la France (1/50 000), Feuille Baie du Mont St Michel (208). BRGM: Orléans. Trenhaile AS. 2001. Modelling the Quaternary evolution of shore platforms and erosional continental shelves. Earth Surface Processes and Landforms 26: 1103- 1128. Grove AT. 1985. The Niger and its Neighbours: Environmental History and Hydrobiology, Human Use and Health Hazards of the Major West African Rivers. Balkema: Rotterdam. Grove AT. 1970. Rise and fall of Lake Chad. Geographical Magazine 42: 432- 439. Maley J. 1977. Palaeoclimates of Central Sahara during the early Holocene. Nature 269: 573- 577. Bills BG, May GM. 1987. Lake Bonneville: Constraints on lithospheric thickness and upper mantle viscosity from isostatic warping of Bonneville, Provo and Gilbert stage shorelines. Journal of Geophysical Research 92: 11493- 11508. Servant M. 1983. Séquences continentales et variations climatiques: évolution du bassin du Tchad au Cénozoïque supérieur. Travaux et Documents 159. ORSTOM: Paris. Schneider JL. 1994. Le Tchad depuis 25 000 ans. Géologie-Archéologie-Hydrogéologie. Masson: Paris. Guiraud R, Binks RM, Fairhead JD, Wilson M. 1992. Chronology and geodynamic setting of Cretaceous-Cenozoic rifting in West and Central Africa. Tectonophysics 213: 227- 234. Gracia Prieto FJ. 1995. Shoreline forms and deposits in Gallocanta Lake (NE Spain). Geomorphology 11: 323- 335. Servant-Vildary S. 1978. Etude des Diatomées et paléolimnologie du Bassin Tchadien au Cénozoïque supérieur. Travaux et Documents 84. ORSTOM: Paris. Carter HC, Guy DE. 1988. Coastal erosion: processes, timing and magnitudes at the bluff toe. Marine Geology 84: 1- 17. Barbeau J, Gèze B. 1957. Les coupoles granitiques et rhyolitiques de la région de Fort-Lamy (Tchad). Comptes Rendus Sommaires de la Société Géologique de France 7: 341- 351. Pias J. 1970. Les formations sédimentaires tertiaires et quaternaires de la cuvette tchadienne et les sols qui en dérivent. Memoir 43. ORSTOM: Paris. Olivry JC, Chouret A, Lemoalle J, Bricquet JP. 1996. Hydrologie du lac Tchad. ORSTOM: Paris. Schneider JL. 1967. Evolution du dernier lacustre et peuplement préhistorique aux Pays Bas du Tchad. Bulletin ASEQUA 14/15: 203- 215. Maley J. 1981. Etudes palynologiques dans le bassin du Tchad et Paléoclimatologie de l'Afrique nord tropicale de 30 000 ans à l'époque actuelle. Travaux et Documents 129. ORSTOM: Paris. Tilho J. 1925. Sur l'aire probable d'extension maxima de la mer paléo-tchadienne. Comptes Rendus de l'Académie des Sciences 181: 643- 646. Trenhaile AS. 2000. Modeling the development of wave-cut shore platforms. Marine Geology 166: 163- 178. Azevedo JMM, Portugal-Ferreira MR. 1999. Volcanic gaps and subaerial records of palaeo-sea-levels on Flores Island (Azores): tectonic and morphological implications. Geodynamics 28: 117- 129. Gentil L. 1904. Sur l'existence de roches alcalines dans le Centre africain. Comptes Rendus de l'Académie des Sciences 139: 413- 415. Lacoin L. 1903. Observations sur la géologie de l'Oubangui au Tchad. Bulletin de la Société Géologique de France 3: 484- 496. 1990; 30 1967; 14/15 1925; 181 1987; 92 1999; 28 1995; 11 1903; 3 1997 1957; 7 1996 1973 1977; 269 1994 2001; 26 1993 1970 1991 1997; 4 1978 1999 2001 1984; 10 2002; 87 1992; 213 1985 1963 1970; 42 1904; 139 1983 1988; 84 1981 2000; 166 1989 Servant M (e_1_2_1_30_1) 1983 Duringer P (e_1_2_1_8_1) 1997; 4 Trenhaile AS (e_1_2_1_33_1) 1997 Servant‐Vildary S (e_1_2_1_31_1) 1978 Lacoin L (e_1_2_1_16_1) 1903; 3 Prothero DR (e_1_2_1_24_1) 1997 Mainguet M (e_1_2_1_18_1) 1990; 30 Schneider JL (e_1_2_1_27_1) 1994 Schroeter P (e_1_2_1_28_1) 1973 Gentil L (e_1_2_1_9_1) 1904; 139 Nemec W (e_1_2_1_21_1) 1984 e_1_2_1_29_1 Olivry JC (e_1_2_1_22_1) 1996 Tilho J (e_1_2_1_32_1) 1925; 181 Pias J (e_1_2_1_23_1) 1970 Barbeau J (e_1_2_1_3_1) 1957; 7 L'Homer A (e_1_2_1_17_1) 1999 e_1_2_1_7_1 e_1_2_1_5_1 e_1_2_1_6_1 e_1_2_1_35_1 e_1_2_1_4_1 e_1_2_1_34_1 e_1_2_1_10_1 e_1_2_1_2_1 e_1_2_1_11_1 Grove AT (e_1_2_1_12_1) 1970; 42 Grove AT (e_1_2_1_13_1) 1985 Maley J (e_1_2_1_20_1) 1981 Grove AT (e_1_2_1_14_1) 1963 Schneider JL (e_1_2_1_26_1) 1989 e_1_2_1_15_1 Schneider JL (e_1_2_1_25_1) 1967; 14 e_1_2_1_19_1 |
References_xml | – volume: 4 start-page: 159 year: 1997 end-page: 168 article-title: Dynamics of graben shoulder fan‐deltas and rift lakes. The example of the upper Rhine Graben (Lower Tertiary, eastern France, southwestern Germany) publication-title: 18th IAS Regional European Meeting of Sedimentology, Heidelberg. Excursion B7, September 2–4, Gaea heidelbergensis – year: 1985 – volume: 10 start-page: 1 year: 1984 end-page: 31 – volume: 92 start-page: 11493 year: 1987 end-page: 11508 article-title: Lake Bonneville: Constraints on lithospheric thickness and upper mantle viscosity from isostatic warping of Bonneville, Provo and Gilbert stage shorelines publication-title: Journal of Geophysical Research – year: 1983 – volume: 7 start-page: 341 year: 1957 end-page: 351 article-title: Les coupoles granitiques et rhyolitiques de la région de Fort‐Lamy (Tchad) publication-title: Comptes Rendus Sommaires de la Société Géologique de France – year: 1981 – volume: 139 start-page: 413 year: 1904 end-page: 415 article-title: Sur l'existence de roches alcalines dans le Centre africain publication-title: Comptes Rendus de l'Académie des Sciences – volume: 14/15 start-page: 203 year: 1967 end-page: 215 article-title: Evolution du dernier lacustre et peuplement préhistorique aux Pays Bas du Tchad publication-title: Bulletin ASEQUA – volume: 3 start-page: 484 year: 1903 end-page: 496 article-title: Observations sur la géologie de l'Oubangui au Tchad publication-title: Bulletin de la Société Géologique de France – volume: 26 start-page: 1103 year: 2001 end-page: 1128 article-title: Modelling the Quaternary evolution of shore platforms and erosional continental shelves publication-title: Earth Surface Processes and Landforms – year: 2001 – volume: 213 start-page: 227 year: 1992 end-page: 234 article-title: Chronology and geodynamic setting of Cretaceous‐Cenozoic rifting in West and Central Africa publication-title: Tectonophysics – year: 1989 – volume: 30 start-page: 261 year: 1990 end-page: 276 article-title: Le massif du Tibesti dans le système éolien du Sahara. Réflexion sur la génèse du lac Tchad publication-title: Berliner geographische Studien – year: 1973 – year: 1996 – start-page: 230 year: 1963 end-page: 245 – start-page: 419 year: 1993 end-page: 448 – year: 1994 – volume: 166 start-page: 163 year: 2000 end-page: 178 article-title: Modeling the development of wave‐cut shore platforms publication-title: Marine Geology – volume: 269 start-page: 573 year: 1977 end-page: 577 article-title: Palaeoclimates of Central Sahara during the early Holocene publication-title: Nature – volume: 87 start-page: 81 year: 2002 end-page: 85 article-title: The Holocene giant Lake Chad revealed by digital elevation models publication-title: Quaternary International – volume: 11 start-page: 323 year: 1995 end-page: 335 article-title: Shoreline forms and deposits in Gallocanta Lake (NE Spain) publication-title: Geomorphology – year: 1997 – volume: 28 start-page: 117 year: 1999 end-page: 129 article-title: Volcanic gaps and subaerial records of palaeo‐sea‐levels on Flores Island (Azores): tectonic and morphological implications publication-title: Geodynamics – year: 1970 – year: 1991 – year: 1978 – volume: 181 start-page: 643 year: 1925 end-page: 646 article-title: Sur l'aire probable d'extension maxima de la mer paléo‐tchadienne. publication-title: Comptes Rendus de l'Académie des Sciences – volume: 84 start-page: 1 year: 1988 end-page: 17 article-title: Coastal erosion: processes, timing and magnitudes at the bluff toe publication-title: Marine Geology – volume: 42 start-page: 432 year: 1970 end-page: 439 article-title: Rise and fall of Lake Chad publication-title: Geographical Magazine – year: 1999 – volume: 7 start-page: 341 year: 1957 ident: e_1_2_1_3_1 article-title: Les coupoles granitiques et rhyolitiques de la région de Fort‐Lamy (Tchad) publication-title: Comptes Rendus Sommaires de la Société Géologique de France contributor: fullname: Barbeau J – ident: e_1_2_1_7_1 – ident: e_1_2_1_10_1 doi: 10.1016/S1040-6182(01)00063-5 – volume: 139 start-page: 413 year: 1904 ident: e_1_2_1_9_1 article-title: Sur l'existence de roches alcalines dans le Centre africain publication-title: Comptes Rendus de l'Académie des Sciences contributor: fullname: Gentil L – volume: 42 start-page: 432 year: 1970 ident: e_1_2_1_12_1 article-title: Rise and fall of Lake Chad publication-title: Geographical Magazine contributor: fullname: Grove AT – start-page: 230 volume-title: African Ecology and Human Evolution year: 1963 ident: e_1_2_1_14_1 contributor: fullname: Grove AT – volume: 30 start-page: 261 year: 1990 ident: e_1_2_1_18_1 article-title: Le massif du Tibesti dans le système éolien du Sahara. Réflexion sur la génèse du lac Tchad publication-title: Berliner geographische Studien contributor: fullname: Mainguet M – volume: 181 start-page: 643 year: 1925 ident: e_1_2_1_32_1 article-title: Sur l'aire probable d'extension maxima de la mer paléo‐tchadienne. publication-title: Comptes Rendus de l'Académie des Sciences contributor: fullname: Tilho J – volume-title: Coastal Dynamics and Landforms year: 1997 ident: e_1_2_1_33_1 doi: 10.1093/oso/9780198233534.001.0001 contributor: fullname: Trenhaile AS – ident: e_1_2_1_15_1 doi: 10.1016/0040-1951(92)90260-D – start-page: 1 volume-title: Sedimentology of Gravels and Conglomerates year: 1984 ident: e_1_2_1_21_1 contributor: fullname: Nemec W – ident: e_1_2_1_4_1 doi: 10.1029/JB092iB11p11493 – volume-title: Etude des Diatomées et paléolimnologie du Bassin Tchadien au Cénozoïque supérieur year: 1978 ident: e_1_2_1_31_1 contributor: fullname: Servant‐Vildary S – volume: 4 start-page: 159 year: 1997 ident: e_1_2_1_8_1 article-title: Dynamics of graben shoulder fan‐deltas and rift lakes. The example of the upper Rhine Graben (Lower Tertiary, eastern France, southwestern Germany) publication-title: 18th IAS Regional European Meeting of Sedimentology, Heidelberg. Excursion B7, September 2–4, Gaea heidelbergensis contributor: fullname: Duringer P – volume: 3 start-page: 484 year: 1903 ident: e_1_2_1_16_1 article-title: Observations sur la géologie de l'Oubangui au Tchad publication-title: Bulletin de la Société Géologique de France contributor: fullname: Lacoin L – volume-title: Sedimentary Geology. An Introduction to Sedimentary Rocks and Stratigraphy year: 1997 ident: e_1_2_1_24_1 contributor: fullname: Prothero DR – ident: e_1_2_1_29_1 – volume: 14 start-page: 203 year: 1967 ident: e_1_2_1_25_1 article-title: Evolution du dernier lacustre et peuplement préhistorique aux Pays Bas du Tchad publication-title: Bulletin ASEQUA contributor: fullname: Schneider JL – volume-title: Géologie et hydrologie de la République de Tchad year: 1989 ident: e_1_2_1_26_1 contributor: fullname: Schneider JL – ident: e_1_2_1_34_1 doi: 10.1016/S0025-3227(00)00013-X – volume-title: The Niger and its Neighbours: Environmental History and Hydrobiology, Human Use and Health Hazards of the Major West African Rivers year: 1985 ident: e_1_2_1_13_1 contributor: fullname: Grove AT – ident: e_1_2_1_5_1 doi: 10.1016/0025-3227(88)90121-1 – volume-title: Notice explicative de la Carte géologique de la France (1/50 000), Feuille Baie du Mont St Michel year: 1999 ident: e_1_2_1_17_1 contributor: fullname: L'Homer A – ident: e_1_2_1_35_1 doi: 10.1002/esp.255 – ident: e_1_2_1_6_1 doi: 10.1002/9781444304015.ch21 – volume-title: Etudes palynologiques dans le bassin du Tchad et Paléoclimatologie de l'Afrique nord tropicale de 30 000 ans à l'époque actuelle. year: 1981 ident: e_1_2_1_20_1 contributor: fullname: Maley J – ident: e_1_2_1_2_1 doi: 10.1016/S0264-3707(98)00032-5 – volume-title: Séquences continentales et variations climatiques: évolution du bassin du Tchad au Cénozoïque supérieur year: 1983 ident: e_1_2_1_30_1 contributor: fullname: Servant M – volume-title: Hydrologie du lac Tchad year: 1996 ident: e_1_2_1_22_1 contributor: fullname: Olivry JC – volume-title: Les formations sédimentaires tertiaires et quaternaires de la cuvette tchadienne et les sols qui en dérivent year: 1970 ident: e_1_2_1_23_1 contributor: fullname: Pias J – ident: e_1_2_1_19_1 doi: 10.1038/269573a0 – volume-title: Le Tchad depuis 25 000 ans. Géologie‐Archéologie‐Hydrogéologie year: 1994 ident: e_1_2_1_27_1 contributor: fullname: Schneider JL – volume-title: Etude hydrogéologique year: 1973 ident: e_1_2_1_28_1 contributor: fullname: Schroeter P – ident: e_1_2_1_11_1 doi: 10.1016/0169-555X(94)00080-B |
SSID | ssj0011489 |
Score | 1.890211 |
Snippet | This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega‐Chad events. Field... Abstract This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega‐Chad events. Field... This paper reports on a study dealing with the rhyolitic inselbergs of Hadjer el Khamis that formed palaeoislands during Lake Mega-Chad events. Field... |
SourceID | hal proquest crossref pascalfrancis wiley istex |
SourceType | Open Access Repository Aggregation Database Index Database Publisher |
StartPage | 1059 |
SubjectTerms | coastal conglomerate Earth Sciences Earth, ocean, space Exact sciences and technology inselberg lake level Lake Mega-Chad Marine and continental quaternary Sciences of the Universe Surficial geology wave erosion |
Title | Coastal conglomerates around the Hadjer el Khamis inselbergs (western Chad, central Africa): new evidence for Lake Mega-Chad episodes |
URI | https://api.istex.fr/ark:/67375/WNG-92GFD294-0/fulltext.pdf https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fesp.502 https://search.proquest.com/docview/18044962 https://hal.science/hal-03058810 |
Volume | 28 |
hasFullText | 1 |
inHoldings | 1 |
isFullTextHit | |
isPrint | |
link | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwnV1db9MwFLVgCMELHwNE-RhXaEIgkS7O7MThbSprK9gmBExMe7HsxF5Hq6ZqWsR44o1XfiO_hHuTtFuRkBBPlhxbca6v7WPn-hzGNq3wgpswC6xN44CudgZKcBfkuBYqb51Vls4h9w_i_qF4cySPLkh91fwQywM3GhnVfE0D3Nhy65w01JWTtqxoJIlGj-DQ-yVxFIH8tL4onQS4ZU_q67JUc6upt7IOXR5QFOQVMuxXio40JRrI18oWK9DzIoCtVqDuTXa8aHsdeDJsz2e2nX37g9bxvz7uFrvR4FLYqR3pNrvkxuvsWiORPjhbZ1d7lQbw2R32o1MYxJQjwK30yaigUy3Eq2CmpNAECCgBp7PPbgpuBG8HBh0JTuneO0WSlfC84WaAzsDkL6EJDoVar-jFK0CYD66ROgVE1LBnhg723Yn59f0n1QE3OS2L3JV32WF392OnHzR6DoEhmBA4L72RLskxEYonPPKhww2ojHLEmT5OhbD5tkeESDkicWGmnDQxzzhx8pjte2xtXIzdfQaRUJ5zbzLcUAnps9QhrLFZLDiPEcSoFoNF7-pJTduha4LmSKNtNdq2xZ5iry-fEs12f2dPUx5Ngkrx8AtvsWeVUyyLmemQQuESqT8d9HQa9bqvo1TosMU2Vrzm_K2SU7grtujJwo00Gp5-y5ixK-al5ioUIo2xQZuVS_ytwXr3wztMHvxbsYfsehV3SGoX8hFbm03n7jHip5ndqIbKb4NtFs4 |
link.rule.ids | 230,315,786,790,891,1382,27957,27958,46329,46753 |
linkProvider | Wiley-Blackwell |
linkToHtml | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwnV1Lb9NAEF5BK9ReeBQQ4dGOUIVAwqnX3fWDWxWaBJpECFpRicNq195t2kRJFCeIcuLGld_IL2HGdlKChIQ4WbK98no8u_vN-ptvGNs1wgmu_dQzJgk9Su30YsGtl-FaGDtjTWxoH7LbC9sn4u2pPK1YlZQLU-pDLDfcaGQU8zUNcNqQ3rtSDbX5pC5JR3IdB7sswqn3S-kogvlJmSodeRi0R2XCLDXdqxqurETX-8SDXCfTfiF-pM7RRK6sbbECPn-HsMUa1LzFPi16X1JPBvX5zNTTr38IO_7f691mNytoCgelL91h1-xoi21UVdL7l1vsRqsoA3x5l31vjDXCyiFgNH02HNPGFkJW0FMq0gSIKQFntAs7BTuEo75GX4JzSn0nMlkOzyt5Bmj0dfYSKn4olCWLXrwCRPpgq2qngKAaOnpgoWvP9M9vP6gN2Ml5Ps5sfo-dNA-PG22vKungaUIKnnXSaWmjDA8i5hEPnG8xBpVBhlDThYkQJtt3CBLpjIisn8ZW6pCnnGR59P59tjYaj-wDBoGIHedOpxhTCenSxCKyMWkoOA8Rx8Q1BovPqyalcocqNZoDhbZVaNsae4qffXmVlLbbBx1F52gejGPuf-Y19qzwiuVtejogNlwk1cdeSyVBq_k6SITya2x7xW2unio5MV6xRzsLP1JoePozo0d2PM8Vj30hkhA7tFv4xN86rA4_vMPDw3-7bYdttI-7HdV50zt6xDYLGiIVv5CP2dpsOrdPEE7NzHYxbn4B7XIa8A |
linkToPdf | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwnV1bb9MwFLZgE5cXLgO0ctksNCGQSBenduLwNrVrC-uqCZiYeLHsxF63Vk3VtIjxxBuv_EZ-CeckabciISGeLDm24hwf25-d4-8jZMdwx5n2E8-YOPTwaqcnObNeCmuhdMYaafAc8rAfdo_5uxNxckXqq-SHWB644cgo5msc4JPU7V6Shtp8UhdII7nOw0aADt16v2SOQpQflzelIw_27FF5Xxar7lYVVxai6wMMg1xHy37F8Eidg4VcKW2xgj2vIthiCWrfJZ8XjS8jT4b1-czUk29_8Dr-19fdI3cqYEr3Sk-6T67Z8Qa5VWmkDy42yI1OIQJ88YD8aGYaQOWIwl76dJThsRYAVqqnKNFEAVFSmM_O7ZTaET0YaPAkeoYX3zGULKcvK3IG2hzo9DWtokNpKVj06g0FnE9tpXVKAVLTnh5aemhP9a_vP7EOtZOzPEtt_pAct_c_NrteJejgacQJnnXCaWGjFBIuWcQC51vYgYogBaDpwphzkzYcQETM4ZH1E2mFDlnCkJRHNx6RtXE2tpuEBlw6xpxOYEfFhUtiC7jGJCFnLAQUI2uELnpXTUreDlUyNAcKbKvAtjXyHHp9-RR5trt7PYV5OAtKyfwvrEZeFE6xLKanQ4yFi4T61O-oOOi0W0HMlV8jWytec_lWwTDeFVq0vXAjBYbH_zJ6bLN5rpj0OY9DaNBO4RJ_a7Da_3AEyeN_K7ZNbh612qr3tn_whNwuYhBR-UI8JWuz6dw-Ayw1M1vFqPkNjuQZnw |
openUrl | ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Coastal+conglomerates+around+the+Hadjer+el+Khamis+inselbergs+%28western+Chad%2C+central+Africa%29%3A+new+evidence+for+Lake+Mega-Chad+episodes&rft.jtitle=Earth+surface+processes+and+landforms&rft.au=Schuster%2C+Mathieu&rft.au=Duringer%2C+Philippe&rft.au=Ghienne%2C+Jean+Francois&rft.au=Vignaud%2C+Patrick&rft.date=2003-09-15&rft.pub=Wiley&rft.issn=0197-9337&rft.eissn=1096-9837&rft.volume=28&rft.issue=10&rft.spage=1059&rft.epage=1069&rft_id=info:doi/10.1002%2Fesp.502&rft.externalDBID=HAS_PDF_LINK&rft.externalDocID=oai_HAL_hal_03058810v1 |
thumbnail_l | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/lc.gif&issn=0197-9337&client=summon |
thumbnail_m | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/mc.gif&issn=0197-9337&client=summon |
thumbnail_s | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/sc.gif&issn=0197-9337&client=summon |