中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 南京地质古生物研究所
  3. 中国科学院南京地质古生物研究所
Constraining the terminal Ediacaran seawater chemistry by Mg isotopes in dolostones from the Yangtze Platform, South China

文献类型：期刊论文

作者Zhang, Pan3; Huang, Kang-Jun3; Luo, Mao1,2; Cai, Yaoping3; Bao, Zhian3; Luo, Mao（罗茂）
刊名PRECAMBRIAN RESEARCH
出版日期2022-08-01
卷号377页码:18
关键词Ediacaran Animal biomineralization Dolomite cement Seawater chemistry Mg isotopes
ISSN号0301-9268
DOI10.1016/j.precamres.2022.106700
通讯作者Huang, Kang-Jun(hkj@nwu.edu.cn) ; Luo, Mao(maoluo@nigpas.ac.cn)
英文摘要The advent of animal biomineralization at the terminal Ediacaran remarkably changed the marine ecological system. Changed seawater Mg/Ca ratio is considered as an important external trigger for this transition, but the intrinsic relationship between seawater Mg/Ca variation and animal biomineralization is not well constrained due to the lack of reliable archives. To constrain the coeval seawater chemistry and explore its role in the origin of metazoan biomineralization, we systematically conducted petrographical and geochemical investigations on dolostones from the terminal Ediacaran (similar to 551 Ma) Dengying Formation of the Yangtze Block in South China. The well-preserved sedimentary fabrics, growth zones as well as cathodoluminescent bands in microbialites and fibrous dolomite cements in the Algal Dolomite Member of the Dengying Formation indicate these dolomites were formed during syn-sedimentary diagenesis. The distribution patterns of rare earth elements in these dolomite components documented relatively anoxic shallow water conditions. Furthermore, negative correlations between O and Mg isotope compositions in well-preserved dolomite components indicate the variable mixture of freshwater with seawater in the shallow platform environment. The pervasive influence of freshwater on seawater indicates an enhanced riverine input, and it should be dominated by silicate weathering flux due to the heavier Mg isotopic compositions in freshwater endmember. Enhanced silicate weathering flux at the basal Dengying Formation may be related to the abundant erosions and exposures caused by the significant changes in Earth's surface tectonic and climatic conditions at the late Ediacaran. Consequently, the increased silicate weathering flux would deliver more Mg cations and net alkalinity to the oceans than the mixed weathering flux, which probably facilitated the subsequent skeletonization of early animals.
WOS关键词RARE-EARTH-ELEMENT ; MAGNESIUM-ISOTOPE ; DOLOMITE ; CARBONATES ; DIAGENESIS ; BIOMINERALIZATION ; EVOLUTION ; CERIUM ; BASIN ; SEAS
资助项目National Natural Science Foundation of China[41973008] ; National Natural Science Foundation of China[41890845] ; National Natural Science Foundation of China[42072004] ; National Natural Science Foundation of China[42130206] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Chinese Academy of Sciences Talents Program[2018-039]
WOS研究方向Geology
语种英语
WOS记录号WOS:000832987800005
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Chinese Academy of Sciences Talents Program
源URL[http://ir.nigpas.ac.cn/handle/332004/41120]  
专题中国科学院南京地质古生物研究所
通讯作者Huang, Kang-Jun; Luo, Mao; Luo, Mao（罗茂）
作者单位1.Chinese Acad Sci, Ctr Excellence Life & Palaeoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Peoples R China
3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Pan,Huang, Kang-Jun,Luo, Mao,et al. Constraining the terminal Ediacaran seawater chemistry by Mg isotopes in dolostones from the Yangtze Platform, South China[J]. PRECAMBRIAN RESEARCH,2022,377:18.
APA Zhang, Pan,Huang, Kang-Jun,Luo, Mao,Cai, Yaoping,Bao, Zhian,&Luo, Mao.(2022).Constraining the terminal Ediacaran seawater chemistry by Mg isotopes in dolostones from the Yangtze Platform, South China.PRECAMBRIAN RESEARCH,377,18.
MLA Zhang, Pan,et al."Constraining the terminal Ediacaran seawater chemistry by Mg isotopes in dolostones from the Yangtze Platform, South China".PRECAMBRIAN RESEARCH 377(2022):18.

入库方式： OAI收割

来源：南京地质古生物研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。