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Hydrothermal activity during Ediacaran–Cambrian transition: Silicon isotopic evidence
Haifeng Fan;  Hanjie Wen;  Xiangkun Zhu;  Ruizhong Hu;  Shihong Tian
2013
Source PublicationPrecambrian Research
Volume224Pages:23-35
Abstract

Abundant bedded chert deposits occurred at the Ediacaran–Cambrian transition interval at the Yangtze Platform, South China. However, there is not a non-controversial and integrated model for the origin of these chert deposits from trace element patterns and oxygen isotopic evidence. To understand the origin and the oceanic environment of these chert deposits, we analyzed the Si isotopic composition, major and trace elements of chert samples from two stratigraphically correlated sections with a depositional age around 542 Ma. The relationship between Al2O3 content and Si isotopic values indicated three end-member sources of Si derivation. The most negative δ30Si values (−0.3‰ to −0.5‰) reflect the silicon derived from hydrothermal fluids due to intense tectonic activity. The most positive δ30Si values (up to +1.2‰) could reflect the increase of 30Si in the hydrothermal fluid by precipitation, or the signature of seawater. The medium δ30Si value (+0.2‰ to +0.7‰) could be interpreted as the mixing of the hydrothermal fluid and volcanic materials with negative δ30Si and ambient seawater with positive δ30Si. It is obvious that the injection of Si-rich hydrothermal fluid would affect the δ30Si and trace element distribution of seawater. In addition, we estimated that the δ30Si values of Ediacaran–Cambrian transitional seawater range from +2.2‰ to +3.5‰ based on assumed fractionation factors −2.3‰ < ɛ < −1.0‰ between precipitated Si in chert deposits and initial dissolved Si in seawater. According to Si isotopic composition and other geochemical evidence, we maintain that hydrothermal activity played an important role not only in the formation of bedded chert and polymetallic ore deposits, but also in the oceanic environment and concurrent evolution of life during Ediacaran–Cambrian transition interval.

KeywordEdiacaran–cambrian Transition Interval bedded Chert Deposits si Isotope hydrothermal Activity
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9422
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550002, China
2.Institute of Geology, Chinese Academy of Geological Sciences (CAGS), Beijing 100037, China
3.Institute of Mineral Resources, Chinese Academy of Geological Sciences (CAGS), Beijing 100037, China
Recommended Citation
GB/T 7714
Haifeng Fan;Hanjie Wen;Xiangkun Zhu;Ruizhong Hu;Shihong Tian. Hydrothermal activity during Ediacaran–Cambrian transition: Silicon isotopic evidence[J]. Precambrian Research,2013,224:23-35.
APA Haifeng Fan;Hanjie Wen;Xiangkun Zhu;Ruizhong Hu;Shihong Tian.(2013).Hydrothermal activity during Ediacaran–Cambrian transition: Silicon isotopic evidence.Precambrian Research,224,23-35.
MLA Haifeng Fan;Hanjie Wen;Xiangkun Zhu;Ruizhong Hu;Shihong Tian."Hydrothermal activity during Ediacaran–Cambrian transition: Silicon isotopic evidence".Precambrian Research 224(2013):23-35.
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