Paleoenvironmental conditions of organic-rich Upper Permian Dalong Formation shale in the Sichuan Basin, southwestern China
Paleoenvironmental conditions of organic-rich Upper Permian Dalong Formation shale in the Sichuan Basin, southwestern China
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四川盆地上二叠统大隆组页岩富有机质古环境条件
DOI：
10.1016/j.marpetgeo.2017.12.003
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发表时间：
2018-03
影响因子：
4.2
通讯作者：
Wei He
中科院分区：
文献类型：
--
作者：
Zhifu Wei;Yongli Wang;Gen Wang;Zepeng Sun;Ting Zhang;Liang Xu;Xunyun Ma;Wei He
Organic geochemical and trace element analysis of a suite of 33 samples collected from the Shangsi section of the Upper Permian Dalong Formation, located near Guangyuan in the northwestern Sichuan Basin, have been used to better understand the marine depositional environment of its shale lithofacies. A 15 m-thick black shale interval near the middle of the formation is enriched in total organic carbon (TOC = 1.1–14.4%, mean = 6.4%). Then-alkane, terpane and sterane biomarker distributions of the shale suggest that its organic matter is of predominantly marine algal origin. Pr/Ph, Pr/n-C17, Ph/n-C18and gammacerane/C30hopane ratios demonstrate that reducing conditions prevailed during its deposition. This interpretation is supported by the redox-sensitive abundance of Mo and the trace element redox ratios Ni/Co, V/Cr, U/Th and V/(V + Ni), all of which indicate deposition in a euxinic/anoxic setting. The Mo-TOC relationship in the Dalong shales plots mid-way between those of sediments in the present-day Saanich Inlet and Cariaco Basin, suggesting a moderately restricted depocentre. However, the δ13Corgvalues of these shales reveal that their organic matter is isotopically much lighter than that found in modern euxinic sediments, implying extremely anoxic bottom waters and a slow-down of oceanic circulation during the Late Permian.
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DOI：
10.1016/j.palaeo.2012.09.033
发表时间：
2012-12
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
M. L. Quijano;J. M. Castro;R. Pancost;G. A. Gea;M. Najarro;R. Aguado;I. Rosales;J. Martín‑Chivelet
通讯作者：
M. L. Quijano;J. M. Castro;R. Pancost;G. A. Gea;M. Najarro;R. Aguado;I. Rosales;J. Martín‑Chivelet
影响因子：
64.8
作者：
Summons, RE;Jahnke, LL;Logan, GA
通讯作者：
Logan, GA
影响因子：
--
作者：
Quanyou Liu;Zhijun Jin;Z. Bing;Dongya Zhu;Q. Meng
通讯作者：
Quanyou Liu;Zhijun Jin;Z. Bing;Dongya Zhu;Q. Meng
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
5.8
作者：
W. Goodfellow;I. Jonasson
通讯作者：
W. Goodfellow;I. Jonasson