Major, trace and platinum-group element geochemistry of the Upper Triassic nonmarine hot shales in the Ordos basin, Central China

•The Upper Triassic Chang 7 hot shales developed under anoxic environment.•Humid paleoclimate was favorable for the deposition of the Chang 7 hot shales.•Tectonics is the major control on the development of the Chang 7 hot shales. The Upper Triassic Chang 7 non-marine hot shales have been proven to...

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Published inApplied geochemistry Vol. 53; pp. 42 - 52
Main Authors Qiu, Xinwei, Liu, Chiyang, Mao, Guangzhou, Deng, Yu, Wang, Feifei, Wang, Jianqiang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2015
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Abstract •The Upper Triassic Chang 7 hot shales developed under anoxic environment.•Humid paleoclimate was favorable for the deposition of the Chang 7 hot shales.•Tectonics is the major control on the development of the Chang 7 hot shales. The Upper Triassic Chang 7 non-marine hot shales have been proven to contribute to Mesozoic oil reservoirs in the Ordos basin, Central China. These shales have been studied extensively in sedimentology, petrology and organic geochemistry. However, the factors controlling the development of the shales are still ambiguously constrained. This paper presents the major, trace, and platinum-group elements (PGEs) data to address these issues. The Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), C-values and clay mineral compositions indicate that the Chang 7 hot shales were developed in a humid paleoclimate. The indicators of redox conditions (Eu/Eu∗, Ce/Ce∗, Ceanom, δU, U/Th, V/(V+Ni) and V/Cr) suggest that the Chang 7 hot shales were developed under anoxic environment. Uranium enrichment (average 46.10ppm) is an important distinguished signature of the Chang 7 hot shales, which was mainly related to synchronous volcanic ash sediments and/or possibly hydrothermal fluids. The PGE concentrations of the Chang 7 hot shales were reported for the first time here, and can be subdivided into two groups. The total abundances of the Group One samples are relatively lower and derived mainly from detrital minerals, while the Group Two samples are relatively higher, and are also likely linked to the synchronous volcanic ash sediments and/or possibly hydrothermal fluids. Combined with the regional geological setting, we tentatively propose that the tectonics is the major control on the development of the Chang 7 hot shales.
AbstractList •The Upper Triassic Chang 7 hot shales developed under anoxic environment.•Humid paleoclimate was favorable for the deposition of the Chang 7 hot shales.•Tectonics is the major control on the development of the Chang 7 hot shales. The Upper Triassic Chang 7 non-marine hot shales have been proven to contribute to Mesozoic oil reservoirs in the Ordos basin, Central China. These shales have been studied extensively in sedimentology, petrology and organic geochemistry. However, the factors controlling the development of the shales are still ambiguously constrained. This paper presents the major, trace, and platinum-group elements (PGEs) data to address these issues. The Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), C-values and clay mineral compositions indicate that the Chang 7 hot shales were developed in a humid paleoclimate. The indicators of redox conditions (Eu/Eu∗, Ce/Ce∗, Ceanom, δU, U/Th, V/(V+Ni) and V/Cr) suggest that the Chang 7 hot shales were developed under anoxic environment. Uranium enrichment (average 46.10ppm) is an important distinguished signature of the Chang 7 hot shales, which was mainly related to synchronous volcanic ash sediments and/or possibly hydrothermal fluids. The PGE concentrations of the Chang 7 hot shales were reported for the first time here, and can be subdivided into two groups. The total abundances of the Group One samples are relatively lower and derived mainly from detrital minerals, while the Group Two samples are relatively higher, and are also likely linked to the synchronous volcanic ash sediments and/or possibly hydrothermal fluids. Combined with the regional geological setting, we tentatively propose that the tectonics is the major control on the development of the Chang 7 hot shales.
The Upper Triassic Chang 7 non-marine hot shales have been proven to contribute to Mesozoic oil reservoirs in the Ordos basin, Central China. These shales have been studied extensively in sedimentology, petrology and organic geochemistry. However, the factors controlling the development of the shales are still ambiguously constrained. This paper presents the major, trace, and platinum-group elements (PGEs) data to address these issues. The Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), C-values and clay mineral compositions indicate that the Chang 7 hot shales were developed in a humid paleoclimate. The indicators of redox conditions (Eu/Eu super([lowast]), Ce/Ce super([lowast]), Ce sub(anom), delta U, U/Th, V/(V + Ni) and V/Cr) suggest that the Chang 7 hot shales were developed under anoxic environment. Uranium enrichment (average 46.10 ppm) is an important distinguished signature of the Chang 7 hot shales, which was mainly related to synchronous volcanic ash sediments and/or possibly hydrothermal fluids. The PGE concentrations of the Chang 7 hot shales were reported for the first time here, and can be subdivided into two groups. The total abundances of the Group One samples are relatively lower and derived mainly from detrital minerals, while the Group Two samples are relatively higher, and are also likely linked to the synchronous volcanic ash sediments and/or possibly hydrothermal fluids. Combined with the regional geological setting, we tentatively propose that the tectonics is the major control on the development of the Chang 7 hot shales.
The Upper Triassic Chang 7 non-marine hot shales have been proven to contribute to Mesozoic oil reservoirs in the Ordos basin, Central China. These shales have been studied extensively in sedimentology, petrology and organic geochemistry. However, the factors controlling the development of the shales are still ambiguously constrained. This paper presents the major, trace, and platinum-group elements (PGEs) data to address these issues. The Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), C-values and clay mineral compositions indicate that the Chang 7 hot shales were developed in a humid paleoclimate. The indicators of redox conditions (Eu/Eu∗, Ce/Ce∗, Ceanom, δU, U/Th, V/(V+Ni) and V/Cr) suggest that the Chang 7 hot shales were developed under anoxic environment. Uranium enrichment (average 46.10ppm) is an important distinguished signature of the Chang 7 hot shales, which was mainly related to synchronous volcanic ash sediments and/or possibly hydrothermal fluids. The PGE concentrations of the Chang 7 hot shales were reported for the first time here, and can be subdivided into two groups. The total abundances of the Group One samples are relatively lower and derived mainly from detrital minerals, while the Group Two samples are relatively higher, and are also likely linked to the synchronous volcanic ash sediments and/or possibly hydrothermal fluids. Combined with the regional geological setting, we tentatively propose that the tectonics is the major control on the development of the Chang 7 hot shales.
Author Deng, Yu
Mao, Guangzhou
Wang, Feifei
Wang, Jianqiang
Liu, Chiyang
Qiu, Xinwei
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  surname: Qiu
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  email: qxweilt@126.com
  organization: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
– sequence: 2
  givenname: Chiyang
  surname: Liu
  fullname: Liu, Chiyang
  email: lcy@nwu.edu.cn
  organization: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
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  givenname: Guangzhou
  surname: Mao
  fullname: Mao, Guangzhou
  organization: College of Geological Science & Engineering, Shandong University of Science and Technology, Qingdao 266510, China
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  givenname: Yu
  surname: Deng
  fullname: Deng, Yu
  organization: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
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  givenname: Feifei
  surname: Wang
  fullname: Wang, Feifei
  organization: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
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  givenname: Jianqiang
  surname: Wang
  fullname: Wang, Jianqiang
  organization: State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
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Snippet •The Upper Triassic Chang 7 hot shales developed under anoxic environment.•Humid paleoclimate was favorable for the deposition of the Chang 7 hot...
The Upper Triassic Chang 7 non-marine hot shales have been proven to contribute to Mesozoic oil reservoirs in the Ordos basin, Central China. These shales have...
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SubjectTerms Basins
cerium
China
chromium
clay
europium
Fluid dynamics
Fluid flow
Geochemistry
minerals
nickel
oil fields
paleoclimatology
Sediments
Shale
tectonics
thorium
uranium
vanadium
Volcanic ash
weathering
Title Major, trace and platinum-group element geochemistry of the Upper Triassic nonmarine hot shales in the Ordos basin, Central China
URI https://dx.doi.org/10.1016/j.apgeochem.2014.11.028
https://www.proquest.com/docview/1701028975
https://www.proquest.com/docview/2000135163
Volume 53
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