黔东南新元古代板溪群乌叶组微量元素地球化学特征及地质意义
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摘要
晚新元古代至早寒武世是地球演化历史上极其重要的时期,该时期地层岩石地球化学特征以及对古海水、古大气、古气候等方面的研究一直是国际地学界的关注热点。利用电感耦合等离子体质谱(ICP-MS)分析了黔东南板溪群乌叶组中的微量元素地球化学特征。结果表明:乌叶组的稀土总量较高,为64.28×10~(-6)～293.84×10~(-6),LREE/HREE比值相对稳定,介于3.83～12.35之间;在不同类型岩性中,稀土含量和配分模式变化不大,样品测试结果中出现Eu的负异常。乌叶组的δCe值从0.95～1.04,表明原岩黑色岩系形成于缺氧的还原沉积环境。
Late Neoproterozoic to Early Cambrian is a very important period in the history of the evolution of the earth.The rock geochemical characteristics of this period and the research on the ancient sea,ancient atmosphere,ancient climate and other aspects have been a hotspot in the international geosciences community.In this paper,inductively coupled plasma mass spectrometry(ICP-MS) was used to analyze REE geochemical characteristics in the formation of Wuye Group,Qiandongnan.The results showed that the total rare earth content in the Wuye Group was 64.28×10~(-6) to 293.84×10~(-6),LREE/HREE ratio was relatively stable,between 3.83 to 12.35;in different types of lithology,rare earth content and distribution patterns varied little,but the samples showed negative Eu anomalies.The delta Ce values of the Wuye Group were from 0.95 to 1.04,indicating that the protolith black rock series were formed in the anoxic sedimentary environment.
Late Neoproterozoic to Early Cambrian is a very important period in the history of the evolution of the earth.The rock geochemical characteristics of this period and the research on the ancient sea,ancient atmosphere,ancient climate and other aspects have been a hotspot in the international geosciences community.In this paper,inductively coupled plasma mass spectrometry(ICP-MS) was used to analyze REE geochemical characteristics in the formation of Wuye Group,Qiandongnan.The results showed that the total rare earth content in the Wuye Group was 64.28×10~(-6) to 293.84×10~(-6),LREE/HREE ratio was relatively stable,between 3.83 to 12.35;in different types of lithology,rare earth content and distribution patterns varied little,but the samples showed negative Eu anomalies.The delta Ce values of the Wuye Group were from 0.95 to 1.04,indicating that the protolith black rock series were formed in the anoxic sedimentary environment.
引文
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[2]杨剑.黔北地区下寒武统黑色岩系形成环境与地球化学研究[D].西安:长安大学,2009.
[3]吴朝东,储著银.黑色页岩微量元素形态分析及地质意义[J].矿物岩石地球化学通报,2001(1):14-20.WU C D,CHU Z Y.Sequential extraction of trace elements and the geological significance of fractions in black shales,West Hunan and East Guizhou[J].Bulletin of Mineralogy Petrology and Geochemistry,2001(1):14-20.
[4]杨競红,蒋少涌,凌洪飞,等.黑色页岩与大洋缺氧事件的Re-Os同位素示踪与定年研究[J].地学前缘,2005(2):143-150.YANG J H,JIANG S Y,LING H F,et al.Re-Os isotope tracing and dating of black shales and oceanic anoxic events[J].Earth Science Frontiers,2005(2):143-150
[5]MAZUMDAR A,TANAKA K,TAKAHASHI T,et al.Characteristics of rare earth element abundances in shallow marine continental platform carbonates of Late Neoproterozoic successions from India[J].Geochemical Journal,2003,37(2):277-289.
[6]WRIGHT J,SCHRADER H,HOLSER W T.Paleoredox variations in ancient oceans recorded by rare earth elements in fossil apatite[J].Geochimica et Cosmochimica Acta,1987,51(3):631-644.
[7]王中刚,于学元,赵振华.稀土元素地球化学[M].北京:科学出版社,1989:279-291.
[8]杨兴莲,朱茂炎,赵元龙,等.黔东震旦系-下寒武统黑色岩系稀土元素地球化学特征[J].地质论评,2008,54(1):3-15.YANG X L,ZHU M Y,ZHAO Y L,et al.REE geochemical characteristics of the Ediacaran-Lower Cambrian black rock series in Eastern Guizhou[J].Geological Review,2008,54(1):3-15.
[9]王劲松,周家喜,刘金海,等.黔东南从江宰便铜铅锌多金属成矿作用与找矿预测[M].北京:科学出版社,2014.
[10]LIANG Q,JING H,GREGOIRE D C.Determination of trace elements in granites by inductively coupled plasma mass spectrometry[J].Talanta,2000,51(3):507-513.
[11]赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,21(3):409-415.ZHAO H G,LIU C Y.Approaches and prospects of provenance analysis[J].Acta Sedimentologica Sinica,2003,21(3):409-415.
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