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Advances in Earth Science  2010, Vol. 25 Issue (7): 730-745    DOI: 10.11867/j.issn.1001-8166.2010.07.0730
The Characteristics of Trace Element and REE Geochemistry of the Cretaceous Mudrocks and Shales from Southern Tibet and Its Analysis of Redox Condition
Xiong Guoqing1, Jiang Xinsheng1, Cai Xiyao2, Wu Hao1
1.Chengdu Institute of Geology and Mineral Resources,Chengdu 610082,China;
2.The West Department of Exploration & Production Research Institute, SINOPEC,Urumchi 830011,China
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To understand the redox conditions of bottom water column of the Cretaceous mudrocks and shales during their deposition from two main marine basins in southern Tibet,  the tests and analysises of trace elements and REEs from the samples were done by the ICP-MS method. The results reveal that the trace elemens in study area have changed both spatially and temporally, and the changes are related to redox-sensive extent of those elements to the water-column. The variable trends of all Al-normalized elements are almost different and  their vertical variations have reflected redox condition of bottom water column of sediments and biological production, related to multiple facters: sea-level osccilation, the flux of terrigenous debris, remobilization of diagensis and post-deposition oxygen. The ratios of V/(V+Ni)、U/Th、V/Cr、Ni/Co、Re/Mo、Uau and δU indicate that condition of bottom water column in southern Tibet basins is generally moderate-stratified oxic condition during the early cretaceous and middle and late  cretaceous, but those elements have suddenly changed between the Cenomanian-Turonian boundary during the early  cretaceous in Gamba-Tingri basin, and revealed anoxic condition. Chondritic-normalized REEs both exhibit LREE enriched,right-tilted, LREE/HREE between 7.42 and 14.80, LaN/YbN range from 7.93 to 18.54, δEu negative abnormal,δCe unclearly abnormal,showing oxic condition. The analysis of trace elements and their REEs  combined  with field observation of outcrop  can be direct foundation for divided and contrasted strata, and determine the condition of bottom water column more accurately and effectively during the deposition.

Key words:  Trace elements and REEs      Bottom water column      Redox condition      Oxic condition      Cenomanian Turonian boundary      Chondritic-normalized.     
Received:  08 August 2009      Published:  10 July 2010
Corresponding Authors:  Xiong Guoqing     E-mail:
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Xiong Guoqing, Jiang Xinsheng, Cai Xiyao, Wu Hao. The Characteristics of Trace Element and REE Geochemistry of the Cretaceous Mudrocks and Shales from Southern Tibet and Its Analysis of Redox Condition. Advances in Earth Science, 2010, 25(7): 730-745.

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