Stromatolites in Middle Ordovician carbonate–evaporite sequences and their carbon and sulfur isotopes stratigraphy, Ordos Basin, northwestern China

被引：2

作者：

Fan-Wei Meng

Zhi-li Zhang

Xian-qin Yan

Pei Ni

Wen-Hang Liu

Fu Fan

Gu-Wei Xie

机构：

[1] Nanjing Institute of Geology and Paleontology,State Key Laboratory of Palaeobiology and Stratigraphy

[2] Chinese Academy of Sciences,State Key Laboratory for Mineral Deposit Research, Institute of Geo

[3] Petroleum Exploration and Development Research Institute,Fluids, School of Earth Science and Engineering

[4] SINOPEC,undefined

[5] Geological Exploration Technology Institute of Jiangsu Province,undefined

[6] Nanjing University,undefined

[7] Institute of Geological Sciences,undefined

[8] Polish Academy of Sciences,undefined

[9] Institute of Mineral Resources,undefined

[10] Chinese Academy of Geological Science,undefined

[11] Institute of Exploration,undefined

[12] Development and Research of PetroChina Company Limited Changqing Oilfield Brand,undefined

[13] National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields,undefined

来源：

Carbonates and Evaporites | 2019年 / 34卷

关键词：

Stromatolites; Ordovician; Carbonate; Ordos Basin; China;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

At the present day, stromatolites are very rare and limited to high-salinity settings. However, abundant and variable stromatolite fossils occur in thick evaporite sequences, the Middle Ordovician Majiagou Formation of the Ordos Basin, northwestern China. The setting and fossil assemblage imply that the high salinity prevented metazoan grazing and allowed stromatolites to flourish. The carbon isotope curve based on new data (average data range from −4.52 to +0.56‰) from drilling cores in Majiagou Formation is in good agreement with Middle Ordovician (Darriwilian), and supports the Middle Ordovician age inferred from biostratigraphy. Sulfur isotopes values (range from +27.1 to +28.0‰) are higher than those of the Upper Ordovician but much lower than those of the Lower Middle Cambrian; thus, the sulfur values imply that the Majiagou Formation is of Middle Ordovician age. New carbon and sulfur isotope data imply that these strata are of Middle Ordovician age, in good agreement with previous paleontological dating.

引用

页码：11 / 20

页数：9

共 104 条

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