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Fluctuations in chemical weathering on the Yangtze Block during the Ediacaran-Cambrian transition: Implications for paleoclimatic conditions and the marine carbon cycle
Zhai, Lina1,2,3; Wu, Chaodong2,3; Ye, Yuntao2,3; Zhang, Shuichang4,5; Wang, Yizhe2,3
2018-01-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume490Pages:280-292
Corresponding AuthorWu, Chaodong(cdwu@pku.edu.cn)
AbstractThe 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.
KeywordProvenance Organic enrichment Redox condition Organic carbon isotope Black shale
DOI10.1016/j.palaeo.2017.11.006
Indexed BySCI
Language英语
Funding ProjectSpecialized Research Fund for the Doctoral Program of Higher Education[20120001110052]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000423637900020
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/157830
Collection海洋地质与环境重点实验室
Corresponding AuthorWu, Chaodong
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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.
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