Petrological and geochemical characteristics of metamorphic and igneous units from the allochthonous Madre de Dios Terrane, Southern Chile
The Denaro Complex, part of the Madre de Dios Terrane is composed of metamorphosed pillow basalts, metahyaloclastites, banded metalliferous and radiolarian metacherts, metapelites and redeposited calcareous metasandstones. The basaltic rocks show primary textures, minerals and structures. They are f...
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| Published in | Gondwana research Vol. 13; no. 2; pp. 238 - 249 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
01.03.2008
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| Abstract | The Denaro Complex, part of the Madre de Dios Terrane is composed of metamorphosed pillow basalts, metahyaloclastites, banded metalliferous and radiolarian metacherts, metapelites and redeposited calcareous metasandstones. The basaltic rocks show primary textures, minerals and structures. They are foliated especially in the vicinities of thrust faults, interpreted to have developed during the accretion of the terrane to the Gondwana margin. Composition of relic primary augite and chromite crystals plots into the MORB field of tectonic discriminant diagrams, as do the analyses of whole rock geochemistry, which indicates that these rocks are akin to volcanic rocks erupted along a constructive plate margin (N- and E-type MORBs), probably in a spreading axis-centered oceanic plateau or ridge. The metamorphic assemblages of pumpellyite–actinolite facies bear witness of metamorphism in a frontal accretionary wedge at elevated
P and low
T conditions, probably related to the Late Triassic–Early Jurassic Chonide event, which has been recognized elsewhere in the Patagonian Andes. |
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| AbstractList | The Denaro Complex, part of the Madre de Dios Terrane is composed of metamorphosed pillow basalts, metahyaloclastites, banded metalliferous and radiolarian metacherts, metapelites and redeposited calcareous metasandstones. The basaltic rocks show primary textures, minerals and structures. They are foliated especially in the vicinities of thrust faults, interpreted to have developed during the accretion of the terrane to the Gondwana margin. Composition of relic primary augite and chromite crystals plots into the MORB field of tectonic discriminant diagrams, as do the analyses of whole rock geochemistry, which indicates that these rocks are akin to volcanic rocks erupted along a constructive plate margin (N- and E-type MORBs), probably in a spreading axis-centered oceanic plateau or ridge. The metamorphic assemblages of pumpellyite–actinolite facies bear witness of metamorphism in a frontal accretionary wedge at elevated
P and low
T conditions, probably related to the Late Triassic–Early Jurassic Chonide event, which has been recognized elsewhere in the Patagonian Andes. |
| Author | Lacassie, J.P. Hervé, F. Calderón, M. Sepúlveda, F.A. |
| Author_xml | – sequence: 1 givenname: F.A. surname: Sepúlveda fullname: Sepúlveda, F.A. email: fersepul@ing.uchile.cl organization: Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile – sequence: 2 givenname: F. surname: Hervé fullname: Hervé, F. organization: Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile – sequence: 3 givenname: M. surname: Calderón fullname: Calderón, M. organization: Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 13518, Correo 21, Santiago, Chile – sequence: 4 givenname: J.P. surname: Lacassie fullname: Lacassie, J.P. organization: Paleoproterozoic Mineralization Research Group, Department of Geology, University of Johannesburg, Auckland Park, Johannesburg, 2006, South Africa |
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| CitedBy_id | crossref_primary_10_1016_j_gr_2007_07_004 crossref_primary_10_1016_j_gr_2015_07_014 crossref_primary_10_1144_SP381_14 crossref_primary_10_1016_j_lithos_2021_106013 crossref_primary_10_1130_B31891_1 crossref_primary_10_1144_0016_76492009_124 crossref_primary_10_1126_science_aav5300 crossref_primary_10_1016_j_lithos_2016_09_001 crossref_primary_10_1093_petrology_egp071 |
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| Keywords | Terrane accretion Seamount subduction Pumpellyite–actinolite facies Frontal accretion Metamorphism |
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| SubjectTerms | Frontal accretion Metamorphism Pumpellyite–actinolite facies Seamount subduction Terrane accretion |
| Title | Petrological and geochemical characteristics of metamorphic and igneous units from the allochthonous Madre de Dios Terrane, Southern Chile |
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