Fluctuations in chemical weathering on the Yangtze Block during the Ediacaran-Cambrian transition: Implications for paleoclimatic conditions and the marine carbon cycle

doi:10.1016/j.palaeo.2017.11.006

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Fluctuations in chemical weathering on the Yangtze Block during the Ediacaran-Cambrian transition: Implications for paleoclimatic conditions and the marine carbon cycle
	Zhai, Lina 1,2,3; Wu, Chaodong 2,3; Ye, Yuntao 2,3; Zhang, Shuichang 4,5; Wang, Yizhe 2,3
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2018-01-15
卷号	490 页码:280-292
关键词	Provenance Organic enrichment Redox condition Organic carbon isotope Black shale
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2017.11.006
通讯作者	Wu, Chaodong(cdwu@pku.edu.cn)
英文摘要	The Ediacaran-Cambrian transition was characterized by profound climatic, tectonic, and oceanographic fluctuations, followed by the reniarkable radiation of metazoans. To further understand the paleoclimatic and paleoenvironmental conditions during this interval, comprehensive mineralogical and geochemical analyses were performed on Ediacaran-Cambrian shales (in the Doushantuo through Jiumenchong to Bianmachong formations) at Daotuo, South China. Their major and trace element compositions and ratios indicate that all of the studied shales were derived from basically uniform source rocks that were similar to granodiorite. The chemical index of alteration (CIA) values in the Doushantuo and Bianmachong formations mostly range from 65 to 80, indicating that they experienced a moderate degree of chemical weathering and were thus deposited in a warm and humid climate. In contrast, a sharp drop in CIA values (similar to 60-70) in the lower Jiumenchong Formation, together with decreased Al/Ti ratios that are indicative of increased eolian inputs, are suggestive of a relatively cold and arid climate for the Early Cambrian Yangtze Block. In this scenario, eolian fluxes could have supplied nutrients to the marine environment; increased upwelling, along with a rising thermocline and nutricline during the extensive marine transgression, could have returned abundant nutrients to the surface seawater, thus greatly stimulating primary productivity and intensifying anoxic conditions, which would ultimately have resulted in a high degree of organic burial in the sediments. Therefore, the negative correlation between the corrected CIA values and the total organic carbon (TOC) content may imply that climate-related changes played a role in the enrichment of organic matter during the Early Cambrian.
资助项目	Specialized Research Fund for the Doctoral Program of Higher Education[20120001110052]
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000423637900020
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/157829]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Wu, Chaodong
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China 3.Peking Univ, Inst Oil & Gas, Beijing 100871, Peoples R China 4.China Natl Petr Corp, Key Lab Petr Geochem, Beijing 100083, Peoples R China 5.PetroChina, State Key Lab Enhancing Oil Recovery, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Zhai, Lina,Wu, Chaodong,Ye, Yuntao,et al. Fluctuations in chemical weathering on the Yangtze Block during the Ediacaran-Cambrian transition: Implications for paleoclimatic conditions and the marine carbon cycle[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2018,490:280-292.
APA	Zhai, Lina,Wu, Chaodong,Ye, Yuntao,Zhang, Shuichang,&Wang, Yizhe.(2018).Fluctuations in chemical weathering on the Yangtze Block during the Ediacaran-Cambrian transition: Implications for paleoclimatic conditions and the marine carbon cycle.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,490,280-292.
MLA	Zhai, Lina,et al."Fluctuations in chemical weathering on the Yangtze Block during the Ediacaran-Cambrian transition: Implications for paleoclimatic conditions and the marine carbon cycle".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 490(2018):280-292.