Palaeoceanographic redox environments for the lower Cambrian Hetang Formation in South China: Evidence from pyrite framboids, redox sensitive trace elements, and sponge biota occurrence
Zhou, Chuanming (周传明)1; Jiang, Shao-Yong2,3
2009-01-15
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
卷号271期号:3-4页码:279-286
摘要

The lower Cambrian Hetang Formation, a black shale sequence, contains a stone coal (a flammable, organic-rich mudstone) unit. Abundant pyrite framboids occur in this unit, with the average mean sizes falling in a narrow range from 4.6 to 5.4 mu m and the maximum diameters being around 10 mu m. The size distribution pattern of the pyrite framboids indicates a euxinic depositional environment. The redox-sensitive trace metals of the stone coal samples reveal a large enrichment of Mo (10-180 times),V (4-40 times), U (10-60 times) and Ni (2-20 times) compared to the average upper continental crust value, consistent with an anoxic environment for their deposition. The redox-sensitive element ratios (Th/U, V/(V+Ni), V/Cr) indicate that the depositional environment for the lower part of the stone coal unit was the most anoxic and euxinic. In contrast, a sponge biota including eleven species of demosponges and hexactinellids and two undetermined forms indicate an oxic or dysoxic environment. To reconcile these two facts, we propose that although an anoxic/euxinic environment predominated during the deposition of the lower Cambrian Hetang Formation black shales, occasional currents may also have brought free oxygen to the bottom water column to allow the growth of the sponges on the sea floor. (C) 2008 Elsevier B.V. All rights reserved.

关键词Pyrite Framboid Black Shale Palaeoredox Proxies Lower Cambrian South China
DOI10.1016/j.palaeo.2008.10.024
语种英语
关键词[WOS]Mo-pge-au ; Black Shales ; Appalachian Basin ; Yangtze Platform ; Oceanic Anoxia ; Geochemistry ; Sediments ; Metals ; Enrichment ; Evolution
资助项目National Natural Science Foundation of China to Zhou, Jiang[40772021] ; National Natural Science Foundation of China to Zhou, Jiang[40372006] ; National Natural Science Foundation of China to Zhou, Jiang[40221301] ; Chinese Academy of Sciences[1CZCX3-SW-141] ; Chinese Ministry of Science and Technology[2006CB806400]
WOS研究方向Physical Geography ; Geology ; Paleontology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号WOS:000263013200008
项目资助者National Natural Science Foundation of China to Zhou, Jiang ; Chinese Academy of Sciences ; Chinese Ministry of Science and Technology
出版者ELSEVIER SCIENCE BV
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/263
专题中国科学院南京地质古生物研究所
其他
通讯作者Zhou, Chuanming (周传明)
作者单位1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
2.Nanjing Univ, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China
3.Nanjing Univ, Ctr Marine Geochem Res, Dept Earth Sci, Nanjing 210093, Peoples R China
推荐引用方式
GB/T 7714
Zhou, Chuanming ,Jiang, Shao-Yong. Palaeoceanographic redox environments for the lower Cambrian Hetang Formation in South China: Evidence from pyrite framboids, redox sensitive trace elements, and sponge biota occurrence[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2009,271(3-4):279-286.
APA Zhou, Chuanming ,&Jiang, Shao-Yong.(2009).Palaeoceanographic redox environments for the lower Cambrian Hetang Formation in South China: Evidence from pyrite framboids, redox sensitive trace elements, and sponge biota occurrence.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,271(3-4),279-286.
MLA Zhou, Chuanming ,et al."Palaeoceanographic redox environments for the lower Cambrian Hetang Formation in South China: Evidence from pyrite framboids, redox sensitive trace elements, and sponge biota occurrence".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 271.3-4(2009):279-286.
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