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塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景

于炳松 陈建强 李兴武 林畅松

于炳松, 陈建强, 李兴武, 林畅松. 塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景[J]. 沉积学报, 2004, 22(1): 59-66.
引用本文: 于炳松, 陈建强, 李兴武, 林畅松. 塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景[J]. 沉积学报, 2004, 22(1): 59-66.
YUBing song, CHENJian qiang, LIXing wu, LINChang song. Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments[J]. Acta Sedimentologica Sinica, 2004, 22(1): 59-66.
Citation: YUBing song, CHENJian qiang, LIXing wu, LINChang song. Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments[J]. Acta Sedimentologica Sinica, 2004, 22(1): 59-66.

塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景

基金项目: 国家自然科学基金项目(批准号:40172042);国家重大基础研究发展规划项目(编号:G1999043304);国家博士学科点专项基金项目(编号:200049107)资助
详细信息
    作者简介:

    于炳松,男,1962年出生,博士,教授,沉积学,层序地防学和地球化学

  • 中图分类号: P588.2;P595

Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments

  • 摘要: 对塔里木盆地北部肖尔布拉克寒武系露头剖面中 8.8m厚的黑色页岩夹硅质岩组合中的硅质岩的系统采样分析表明,该硅质岩具有深源成因特征。其低的Th/U和Rb/Sr比也证明了其沉积时所具有的深部物源和热水注入迹象。硅质岩的稀土元素经北美页岩标准化后的Ce/Ce 从 0.4 2到 0.79,平均 0.5 7。Ce的负异常明显。这些稀土元素的参数特征与加利福尼亚弗朗希斯科杂岩 (FranciscanComplex)中沉积在大洋海底硅质岩的稀土元素特征十分相似。北美页岩标准化后的Eu/Eu 值从 8.0 5下降到 1.0 3。其相对较高的Eu/Eu 值很有可能反映了热水的注入。Eu/Eu 值从剖面底部到顶部的系统降低反映了剖面底部的热水作用最强烈,向上热水作用逐渐减弱。上述一系列的地球化学标志指示该硅质岩应沉积在离洋中脊不远的、具有深源物质/热水注入的远洋盆地背景中。结合区域地质和伴生黑色页岩地球化学的综合分析认为,该套硅质岩的形成与上升洋流的影响有关。上升洋流将形成于大洋盆地背景中的物质带到大陆边缘陆棚环境中发生沉积,造成了沉积在陆棚环境中的硅质岩,在地球化学组成上保留了其大洋盆地背景的特征
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目录

    塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景

      基金项目:  国家自然科学基金项目(批准号:40172042);国家重大基础研究发展规划项目(编号:G1999043304);国家博士学科点专项基金项目(编号:200049107)资助
      作者简介:

      于炳松,男,1962年出生,博士,教授,沉积学,层序地防学和地球化学

    • 中图分类号: P588.2;P595

    摘要: 对塔里木盆地北部肖尔布拉克寒武系露头剖面中 8.8m厚的黑色页岩夹硅质岩组合中的硅质岩的系统采样分析表明,该硅质岩具有深源成因特征。其低的Th/U和Rb/Sr比也证明了其沉积时所具有的深部物源和热水注入迹象。硅质岩的稀土元素经北美页岩标准化后的Ce/Ce 从 0.4 2到 0.79,平均 0.5 7。Ce的负异常明显。这些稀土元素的参数特征与加利福尼亚弗朗希斯科杂岩 (FranciscanComplex)中沉积在大洋海底硅质岩的稀土元素特征十分相似。北美页岩标准化后的Eu/Eu 值从 8.0 5下降到 1.0 3。其相对较高的Eu/Eu 值很有可能反映了热水的注入。Eu/Eu 值从剖面底部到顶部的系统降低反映了剖面底部的热水作用最强烈,向上热水作用逐渐减弱。上述一系列的地球化学标志指示该硅质岩应沉积在离洋中脊不远的、具有深源物质/热水注入的远洋盆地背景中。结合区域地质和伴生黑色页岩地球化学的综合分析认为,该套硅质岩的形成与上升洋流的影响有关。上升洋流将形成于大洋盆地背景中的物质带到大陆边缘陆棚环境中发生沉积,造成了沉积在陆棚环境中的硅质岩,在地球化学组成上保留了其大洋盆地背景的特征

    English Abstract

    于炳松, 陈建强, 李兴武, 林畅松. 塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景[J]. 沉积学报, 2004, 22(1): 59-66.
    引用本文: 于炳松, 陈建强, 李兴武, 林畅松. 塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景[J]. 沉积学报, 2004, 22(1): 59-66.
    YUBing song, CHENJian qiang, LIXing wu, LINChang song. Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments[J]. Acta Sedimentologica Sinica, 2004, 22(1): 59-66.
    Citation: YUBing song, CHENJian qiang, LIXing wu, LINChang song. Rare Earth and Trace Element Patterns in Bedded- cherts from the Bottom of the Lower Cambrian in the Northern Tarim Basin, Northwest China :Implication for Depositional Environments[J]. Acta Sedimentologica Sinica, 2004, 22(1): 59-66.
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