| 白云岩埋藏成岩作用过程中的金属元素与同位素再分配规律与受控因素 |
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| 引用本文： | 陈永权,周新源.白云岩埋藏成岩作用过程中的金属元素与同位素再分配规律与受控因素[J].海相油气地质,2009,14(3):65-67. |
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| 作者姓名： | 陈永权 周新源 |
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| 作者单位： | 中国石油塔里木油田分公司勘探开发研究院 |
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| 摘 要： | 前人在白云岩岩石地球化学研究过程中注意到,在开放体系下埋藏成岩作用过程中白云石金属元素含量与同位素组成将发生再分配,然而到目前为止还没有系统的理论来解释这一现象。根据化学平衡原理,提出离子半径理论控制白云岩在埋藏过程中的金属元素与同位素组成再分配规律,基本概念为大半径离子含量减少,小半径离子含量升高。根据这一理论,结合Ca、Mg、Fe、Mn、Sr等+2价离子的离子半径数值得出推论,在埋藏压实成岩作用过程中白云石将向着有序度升高的方向转化,白云石中的Fe、Mn含量升高,Sr含量降低,同位素比值87Sr/86Sr升高。该结论与前人资料有着高度的一致性。
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| 关 键 词： | 白云石 成岩作用 金属元素 锶同位素 离子半径 |
Theory of Ion Radius: The Reassigning Theory of Metal Elements and Isotopes during Burial Diagenesis Process for Dolostone |
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| Chen Yongquan,Zhou Xinyuan.Theory of Ion Radius: The Reassigning Theory of Metal Elements and Isotopes during Burial Diagenesis Process for Dolostone[J].Marine Origin Petroleum Geology,2009,14(3):65-67. |
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| Authors: | Chen Yongquan Zhou Xinyuan |
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| Abstract: | Previous research had proved that concentration of elements and compositions of isotopes in dolostone will reassign during the burial diagenesis in open system but no any principle for interpreting the rules is available yet. Chemical equilibration rules were employed and figured out that it is the ion radius that controls the reassigning of elements and isotopes during diagenesis. According to the principle,associated with the radius values of +2-valenced Ca, Mg, Fe, Mn and Sr ions, we can make deductions as following: 1) The dolostone order will increase during diagenesis; 2) the Fe and Mn concentrations in dolostones will be increase but Sr content will decrease and the ratio of isotope 87Sr/86Sr will increase during diagenesis. All of the deductions were supported by previously published data. |
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| Keywords: | Dolomite Diagenesis Metal element Strontium Isotope Theory of ion radius |
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