扬子克拉通峡东地区新元古代-寒武纪黑色岩系Os同位素地球化学特征及其地质意义

王浩; 凌文黎; 段瑞春; 杨红梅; 陈子万; 秦雅东

doi:10.3799/dqkx.2012.052

Volume 37 Issue 3

May 2012

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WANG Hao, LING Wen-li, DUAN Rui-chun, YANG Hong-mei, CHEN Zi-wan, QIN Ya-dong, 2012. Os Isotopic Geochemistry of Neoproterozoic-Cambrian Black Shales in Eastern Three Gorges of Yangtze Craton and Its Geological Significance. Earth Science, 37(3): 451-462. doi: 10.3799/dqkx.2012.052

Citation:

WANG Hao, LING Wen-li, DUAN Rui-chun, YANG Hong-mei, CHEN Zi-wan, QIN Ya-dong, 2012. Os Isotopic Geochemistry of Neoproterozoic-Cambrian Black Shales in Eastern Three Gorges of Yangtze Craton and Its Geological Significance. Earth Science, 37(3): 451-462. doi: 10.3799/dqkx.2012.052

Citation:

WANG Hao, LING Wen-li, DUAN Rui-chun, YANG Hong-mei, CHEN Zi-wan, QIN Ya-dong, 2012. Os Isotopic Geochemistry of Neoproterozoic-Cambrian Black Shales in Eastern Three Gorges of Yangtze Craton and Its Geological Significance. Earth Science, 37(3): 451-462. doi: 10.3799/dqkx.2012.052

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Os Isotopic Geochemistry of Neoproterozoic-Cambrian Black Shales in Eastern Three Gorges of Yangtze Craton and Its Geological Significance

doi: 10.3799/dqkx.2012.052

WANG Hao^{1, 2
,},
LING Wen-li^{1, 3
,
,},
DUAN Rui-chun⁴,
YANG Hong-mei⁴,
CHEN Zi-wan^{1, 2, 3},
QIN Ya-dong^{1, 2}

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Graduate School, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
4.
Wuhan Institute of Geology and Mineral Resources, Wuhan 430205, China

Received Date: 2011-04-10
Available Online: 2021-11-09
Publish Date: 2012-05-01

Abstract

Abstract

This paper presents an integrated Re-Os isotope and trace element investigation of the Neoproterozoic to Cambrian organic-bearing black mudstones in the eastern Three Gorges, the Yangtze Craton. Their sedimentary environmental evolution and geological significance are then discussed. It shows that (1) initial Os isotopic ratios of fine-grained sedimentary rocks from the strata display regular variations along the stratigraphic column. Of the strata, layers with negative δ¹³C excursions are coupled with high initial Os isotopic ratios; (2) the Nantuo tillite displays higher initial Os isotopic ratio than that of the overlying cap carbonate, while the overlying successive strata show an increase trend with several fluctuations; (3) geochemical features of U/Th ratio and δU value for the samples suggest that the Liantuo sandstone and Nantuo tillite were formed within oxidation environments, whereas black mudstones of the Doushantuo, Dengying and Shuijingtuo Formations were formed within reductive environments; (3) negative correlation between Y/Ho ratio and δCe value for the black mudstones is likely indicative of variable involvement of seafloor hydrothermal activity during some sediments deposited, which likely accounts for their low Os isotopic ratios. The correlation between high initial Os isotopic ratios and pulsed oxidation of deep ocean as well as appearance of metazoan in Late Neoproterozoic-Early Cambrian afford a new clue for the linking of continental weathering extent with oxygen content in atmosphere and ocean. These Os isotopic and trace element features infer that the Nantuo tillites were formed in an environment where the earth's surface had not been fully covered by ice layer, and continent-derived inputs by intensive weathering played an important role.
- stratigraphy,
- eastern Three Gorges,
- Late Neoproterozoic,
- Cambrian,
- black shales,
- Re-Os isotope,
- environmental evolution

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References(62)

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