安徽潜山县双河大理岩锆石U-Pb年龄及其地质意义
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国家重点基础研究发展计划(973计划),中国科学院知识创新项目


Zircon U-Pb ages of the marble from Shuanghe Qianshan County and their geological significance
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    摘要:

    本文分析了双河大理岩的岩石化学成分、微量元素和稀土元素,并通过锆石“CL”图像,研究确定变质锆石和变质复合锆石测点位置。定年结果:1)变质复合锆石中老核“继承锆石”,共测定32个点,年龄范围在2357~342Ma:属于元古宙的15个,年龄范围在2357~572Ma,古生代17个年龄范围在524~342Ma;2)变质锆石部分共测定8个点,其中5个点年龄范围在249~234Ma,相当超高压变质时间。年龄范围在228~221Ma,即退变质时间。前述大量古生代的岩浆碎屑锆石(继承锆石)存在,表明双河大理岩的原岩泥灰岩,时代不会早于古生代。

    Abstract:

    The paper analyzes the chemical composition and trace elements of the Shuanghe marble rock and also studies on confirming the point position of the Metamorphic and metamorphic complex zircon by CL zircon image. The dating result as follows: 1) The older core \"inherited zircon\" in the metamorphic complex zircon were measured 32 points ranging from 2357Ma to 342Ma, among these 15 belong to Proterozoic era with the age range from 2357Ma to 572Ma and 17 are Paleozoic from 524Ma to 342Ma. 2)8 points had been made in the Metamorphic zircon and 5 in which within the scope of 249Ma to 234Ma corresponding to the UHP time, furthermore age ranging at 228Ma ~221Ma are retrograde time. Above all, the existing of a large number of Paleozoic magmatic inherited zircon indicates the original rock of the Shuanghe marble rock will not earlier than the Paleozoic era.

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夏斌,袁亚娟,张玉泉,王敏,夏连泽,李贺,汪方跃,张红,吴维平.2012.安徽潜山县双河大理岩锆石U-Pb年龄及其地质意义[J].地质学报,86(4):619-625.
LIU Zhen, HUANG Yanhui, LIU Jingjing, PAN Gaofeng, WU Xunda, WANG Jing, ZHANG Shengbin.2012. Zircon U-Pb ages of the marble from Shuanghe Qianshan County and their geological significance[J]. Acta Geologica Sinica,86(4):619-625.

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  • 收稿日期:2011-09-13
  • 最后修改日期:2012-01-18
  • 录用日期:2012-01-29
  • 在线发布日期: 2012-03-26
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