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Geochemical constraints on the origin and environment of Lower Cambrian, selenium-rich siliceous sedimentary rocks in the Ziyang area, Daba region, central China
Caixia Feng; Guoxiang Chi; Jiajun Liu; Ruizhong Hu; Shen Liu; Ian M. Coulson
2012
Source PublicationInternational Geology Review
Volume54Issue:7Pages:765-778
AbstractThe Ziyang area is one of the two major regions of central China subjected to selenium (Se) poisoning. Systematic studies of Se contents of different lithologies from this area indicate that Lower Cambrian, carbonaceous, and siliceous strata host the highest Se contents (with Se contents of up to 278 ppm). We have investigated their geochemical characteristics (major and trace elements, and Si and O isotopes), origin, and sedimentary environment of formation. The siliceous rocks are characterized by a wide range in major elements, and are enriched in Se, Ba, Cu, Ni, V, As, Sb, and U relative to average continental crust. They are also enriched in light rare earth elements relative to heavy rare earth elements (La-N/Yb-N = 1.64-35.7) and show weak or moderate negative Ce anomalies and strong positive Eu anomalies. delta Si-30(NBS-28) and delta O-18(V)-SMOW values range from -0.3 parts per thousand to 0.6 parts per thousand and 16.1 parts per thousand to 21.7 parts per thousand, respectively. The homogenization temperatures of inclusions within the studied samples range from 113 degrees C to 319 degrees C, and their salinities from 1.2 to 13.7 wt.% NaCl equivalent. Our results suggest that the studied siliceous rocks resulted from hydrothermal sedimentation in a relatively anoxic semi-deep sea sedimentary environment. The hydrothermal fluid responsible for Se-mineralization involved the mixing of low-temperature high-salinity fluid, low-temperature low-salinity fluid, and a high-temperature low-salinity basinal fluid in the NaCl-(KCl)-H2O system.
KeywordSiliceous Rocks Selenium Content Sedimentary Environment Shaanxi Province China
Subject Area矿床地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/7117
Collection矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Caixia Feng,Guoxiang Chi,Jiajun Liu,et al. Geochemical constraints on the origin and environment of Lower Cambrian, selenium-rich siliceous sedimentary rocks in the Ziyang area, Daba region, central China[J]. International Geology Review,2012,54(7):765-778.
APA Caixia Feng,Guoxiang Chi,Jiajun Liu,Ruizhong Hu,Shen Liu,&Ian M. Coulson.(2012).Geochemical constraints on the origin and environment of Lower Cambrian, selenium-rich siliceous sedimentary rocks in the Ziyang area, Daba region, central China.International Geology Review,54(7),765-778.
MLA Caixia Feng,et al."Geochemical constraints on the origin and environment of Lower Cambrian, selenium-rich siliceous sedimentary rocks in the Ziyang area, Daba region, central China".International Geology Review 54.7(2012):765-778.
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