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Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate?

文献类型：期刊论文

作者Liu, Mu3,4,5; Chen, Daizhao3,4,5; Zhou, Xiqiang3,5; Tang, Dongjie1,2; Them, Theodore R., II6; Jiang, Maosheng3,5
刊名GLOBAL AND PLANETARY CHANGE
出版日期2019-12-01
卷号183页码:15
关键词Marine red bed Hematite Sandbian Ocean ventilation and oxygenation Climate cooling Carbon cycle
ISSN号0921-8181
DOI10.1016/j.gloplacha.2019.103032
英文摘要Marine red beds (MRB) have been commonly interpreted as products of bottom water oxygenation (or ventilation) and coeval perturbations of the global carbon cycle during greenhouse climates. The Sandbian (Upper Ordovician) successions at Dawangou and Nanyigou in NW Tarim, China are characterized by deep-shelf nodular red limestones. Using ultraviolet-visible-near infrared (UV-VIS-NIR) diffuse reflectance spectroscopy (DRS), field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray spectrometer (EDS), and paired inorganic and organic carbon isotope systematics, this study attempts to reveal the origin of these MRBs and coeval carbon cycling during deposition. Both the DRS and FESEM results consistently show that these red limestones are exclusively impregnated with amorphous to poorly crystalline, submicron ferric oxides (mostly hematite), constituting the dominant components of the red pigment. Hematite aggregates (or lumps) occur either in the calcite crystal interstices and pores or within the lattice structure of calcite crystals, implicating early diagenetic or syndepositional origins. Paired organic and inorganic carbon isotope data through the MRB successions demonstrate a time-specific Sandbian positive carbon isotope plateau (similar to 1 to 2%o VPDB) in both fractions as reported elsewhere around the world. This may have intitially resulted from enhanced burial of organic matter, then a drawdown of atmospheric pCO(2) levels, and subsequent climate cooling. This scenario agrees with the decreasing isotope difference (Delta C-13 = delta C-13(carb )- delta C-13(org); similar to 26 parts per thousand VPDB on average) in the Sandbian MRBs relative to the underlying strata (similar to 29 parts per thousand VPDB) from both sections. A cooling climate could have accelerated oceanic ventilation rates and led to increased oxygenation of deep-shelf water masses, eventually facilitating the widespread deposition of MRBs near continental margins. The persistence of a cool climate and the expansion of oxygenated deep-shelf water masses onto the shelf that initiated during the Darriwilian may have stimulated the rapid biodiversification of marine organisms during the Sandbian.
WOS关键词CARBON-ISOTOPE STRATIGRAPHY ; DELTA-C-13 EXCURSION GICE ; MIDDLE ORDOVICIAN ; SOUTH CHINA ; BIODIVERSIFICATION EVENT ; YANGTZE PLATFORM ; ORGANIC-MATTER ; BLACK SHALES ; BEDS CORBS ; ATMOSPHERIC OXYGEN
资助项目National Natural Science Foundation of China[91755210] ; National Natural Science Foundation of China[41573010] ; National Key R&D Program of China[2017YFC0603103]
WOS研究方向Physical Geography ; Geology
语种英语
WOS记录号WOS:000497250400003
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95794]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Chen, Daizhao
作者单位1.China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China
2.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Key Lab Petr Resources Res, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100049, Peoples R China
6.Coll Charleston, Dept Geol & Environm Geosci, Charleston, SC 29424 USA
推荐引用方式
GB/T 7714		 Liu, Mu,Chen, Daizhao,Zhou, Xiqiang,et al. Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate?[J]. GLOBAL AND PLANETARY CHANGE,2019,183:15.
APA Liu, Mu,Chen, Daizhao,Zhou, Xiqiang,Tang, Dongjie,Them, Theodore R., II,&Jiang, Maosheng.(2019).Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate?.GLOBAL AND PLANETARY CHANGE,183,15.
MLA Liu, Mu,et al."Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate?".GLOBAL AND PLANETARY CHANGE 183(2019):15.

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来源：地质与地球物理研究所

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