典型文献
Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China)
文献摘要：
The Ediacaran-Cambrian (E-C) succession in South China records remarkable oceanic, biological and geochemical variations, but it was not well defined geochronologically, which hinders the interpretation of the spatio-temporal seawater chemical architecture during the time E-C interval. This study presents two Re-Os isochron ages of 520.2 ± 6.1 and 561.7 ± 8.5 Ma for the barite-rich black shales from the top Liuchapo and Doushantuo formations respectively in Tianzhu County, Guizhou Province. In combination with existing age data, the two new Re-Os isochron ages suggest that the Liuchapo Formation was deposited between 550 and 520 Ma. Moreover, like the polymetallic Ni-Mo- PGE layers of shelf margin (or platform) facies and V-rich horizons of transitional (or shelf slope) to deep-water facies, the barite deposits were likely formed due to differential mineralization. The timing offset likely resulted from differential elemental concentration related to certain local factors (i. e., hy- drothermal fluids, seawater redox and biological activity). The isochron-derived initial 187Os/188Os ratios of the top Liuchapo Formation (0.902 ± 0.048) and the Doushantuo Formation (0.740 ± 0.042) fall with- in the range of continental weathering flux (1.54) and oceanic crust (0.126), implying the involvement of marine hydrothermal fluids. Moreover, their difference of initial 187Os/188Os ratios may reflect varia- tions of continental weathering intensity and uplift magnitude.
文献关键词：
中图分类号：
作者姓名：
Yong Fu;Fuliang Wang;Chuan Guo;Chao Li;Peng Xia
作者机构：
College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;Guizhou Geological Environment Monitoring Institute,Guizhou 550081,China;National Research Center for Geoanalysis,Chinese Academy of Geological Sciences,Beijing 100037,China
文献出处：
引用格式：
[1]Yong Fu;Fuliang Wang;Chuan Guo;Chao Li;Peng Xia-.Re-Os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block (South China))[J].地球科学学刊（英文版）,2022(01):25-35
A类：
Liuchapo,geochronologically,barite,Doushantuo,Tianzhu
B类：
Re,Geochronology,Formation,across,Ediacaran,Cambrian,Boundary,Yangtze,Block,South,China,succession,records,remarkable,oceanic,biological,geochemical,variations,but,was,not,well,defined,which,hinders,interpretation,spatio,temporal,seawater,architecture,during,interval,This,study,presents,two,isochron,ages,Ma,rich,black,shales,from,top,formations,respectively,County,Guizhou,Province,In,combination,existing,data,new,suggest,that,deposited,between,Moreover,polymetallic,PGE,layers,shelf,margin,platform,facies,horizons,transitional,slope,deep,deposits,were,likely,formed,due,differential,mineralization,timing,offset,resulted,elemental,concentration,related,certain,local,factors,fluids,redox,activity,derived,initial,187Os,188Os,ratios,fall,range,continental,weathering,flux,crust,implying,involvement,marine,hydrothermal,their,difference,may,reflect,intensity,uplift,magnitude
AB值：
0.554968
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