Geochemical characteristics of trace elements and rare earth elements during the Cryogenian-Ediacaran transition in Yangtze Gorges area
Tian Xinglei1,2, Luo Kunli1, Wang Shaobin1,2, Ni Runxiang1,2
1 Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101
2 University of Chinese Academy of Sciences,Beijing 100049
Geochemical characteristics of trace elements and rare earth elements were analyzed on 102 rock samples including tillites from the top of Nantuo Formation in Marinoan glaciation and carbonate from the lower part of Doushantuo Formation (cap carbonate of Member Ⅰ and lower part of Member Ⅱ)of Ediacaran in Tianjiayuanzi section,the stratotype section of Doushantuo Formation,in Yangtze Gorges area. Enrichment characteristics of redox-sensitive elements(RSEs)(Zn,Co,U,Mo,Ni and V)and its probable genetic mechanism and depositional water environment during the Cryogenian-Ediacaran transition in Yangtze Gorges area were systemically researched. The results indicated that only Zn and Co were enriched in the Nantuo Formation,in the lower part of cap carbonate all RSEs changed to be enriched,while in the top of cap carbonate all RSEs were depleted except Zn and V. In the lower of Member Ⅱ of Doushantuo Formation, RSEs changed from depleted in the lower part to relatively stable in the upper. In the lower Doushantuo Formation,there were twice significant enrichments of RSEs. One happened in 0.4 m position of cap carbonate,and the other happened in 6.5 m position of the section(the lower part of Member Ⅱ of Doushantuo Formation). Most of the rock samples had slightly positive Eu anomalies(Eu/Eu* ＜1.6), but two significant positive Eu anomalies happened at the same places with the two significant enrichments of RSEs. Combined with palaeoenvironmental proxies(REE distribution patterns,Y/Ho,Ce anomalies,and La anomalies) in Doushantuo Formation, it was suggested that both of the anomalies were derived primarily from hydrothermal fluids, and upwelling of anoxic water caused those elements reach to peak. U/Th,V/(V+Ni) values and palaeoenvironmental proxies of REE suggested that the sedimentary environment during the top of Nantuo Formation was oxic on the whole,and with glacial ablation,deposition of cap carbonate was affected by melting ice water and sedimentary environment had endured an oxic-anoxic-oxic change with an increasing of the water column stratification. In the lower part of Member Ⅱ of Doushantuo Formation,the depositional environment was mainly suboxic and with a weak water column stratification.
Tian Xinglei,Luo Kunli,Wang Shaobin et al. Geochemical characteristics of trace elements and rare earth elements during the Cryogenian-Ediacaran transition in Yangtze Gorges area[J]. JOPC, 2014, 16(4): 483-502.
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