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- W2353393611 abstract "The black rock series of Lower Cambrian are well developed in Chengkou district,Chongqing.ICP-MS techniques was used to analyze trace element contents in Lower Cambrian black rock series,including cherts,black siltstones and multi-elements concentrated layers.Compared to northern Guizhou and northwestern Hunan,the REE in these rocks is very low with the value ranging from 111.41×10-6 to 184.13×10-6,averaging 138.83×10-6.LREE/HREE ratios vary from 2.49 to 3.44,indicating that LREE is relative abundant.δCe values range from 0.39 to 0.46,showing almost negative anomaly,and the δEu shows unconspicuous anomaly,with the value between 0.84 and 1.10.The indicators of δCe,δU,V/Cr,Ni/Cr and V/(V+Ni) demonstrated that these black rock series formed in the anoxic environment.REE geochemical characteristics and their diagrams,high enrichments of Cr,Sb,As,Bi and U/Th ratios indicated that black rock series mainly formed by hydrothermal deposition.Meanwhile,the petrogenesis of black rock series was associated with volcanism,which provided the composition and dynamics to the hydrothermal activity." @default.
- W2353393611 created "2016-06-24" @default.
- W2353393611 creator A5031879016 @default.
- W2353393611 date "2011-01-01" @default.
- W2353393611 modified "2023-09-23" @default.
- W2353393611 title "ELEMENTAL CHARACTERISTICS OF THE LOWER CAMBRIAN BLACK ROCK SERIES IN CHENGKOU DISTRICT,CHONGQING AND THEIR GENETIC SIGNIFICANCES" @default.
- W2353393611 hasPublicationYear "2011" @default.
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