气候变化领域集成服务门户(CCPortal): Towards understanding the origin of massive dolostones

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DOI	10.1016/j.epsl.2020.116403
	Towards understanding the origin of massive dolostones
	Ning M.; Lang X.; Huang K.; Li C.; Huang T.; Yuan H.; Xing C.; Yang R.; Shen B.
发表日期	2020
ISSN	0012821X
卷号	545
英文摘要	The origin of ancient massive dolostones, i.e. continuous dolostone sequence with a thickness >100 m and a platform-wide distribution, is the key issue of the ‘Dolomite Problem’ that cannot be clearly demonstrated by any existing dolomitization model individually or sequentially. It has been proposed that the massive dolostone could be generated by the stacking of multistage dolomitization events linked to the sea-level fluctuation, which results in repeatedly occurring of limestone precipitation-dolomitization cycles. However, the sequence of dolomitization events cannot be differentiated by any sedimentological or traditional geochemical techniques. Here we report Mg isotopic compositions of the massive dolostone (δ26Mgdol) from the middle Cambrian Qinjiamiao Formation (QJM) in the Yangtze Platform, South China, which consists of cyclic depositions of shoaling upward sequences. The stratigraphic variation of δ26Mgdol is coincident with the depositional cycles, suggesting the dolomitization might be periodic and be coupled with the sea-level oscillation. As dolomitization fluids experience changes in δ26Mg values during dolomitization processes, the intra-cycle stratigraphic δ26Mgdol profile reflects the processes of dolomitization. Our study indicates that the massive dolostone could be generated by the temporal and spatial stacking of multiple dolomitization events that are associated with sea-level fluctuation. If this model can be verified by other massive dolostone successions, the origin of massive dolostone may be resolved. © 2020 Elsevier B.V.
关键词	Cambrian Dolomite problem magnesium isotope sea level change sedimentary cycles South China
英文关键词	Deposition; Lime; Stratigraphy; Cyclic deposition; Dolomitization; Dolomitization models; Geochemical techniques; Isotopic composition; Sea-level fluctuations; Sea-level oscillations; Temporal and spatial; Sea level; Cambrian; deposition; dolomitization; dolostone; isotopic composition; magnesium; sea level change; stratigraphy; China; Yangtze Platform
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202807
作者单位	Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Beijing, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, China; State Key Laboratory of Continental Dynamics, Shannxi Key Laboratory of Early Life and Environment, Department of Geology, Northwest University, Xi'an, China; National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing, China
推荐引用方式 GB/T 7714	Ning M.,Lang X.,Huang K.,et al. Towards understanding the origin of massive dolostones[J],2020,545.
APA	Ning M..,Lang X..,Huang K..,Li C..,Huang T..,...&Shen B..(2020).Towards understanding the origin of massive dolostones.Earth and Planetary Science Letters,545.
MLA	Ning M.,et al."Towards understanding the origin of massive dolostones".Earth and Planetary Science Letters 545(2020).