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    北淮阳新开岭地区花岗岩锆石U-Pb年龄和氧同位素组成

    吴元保 郑永飞 龚冰 赵子福

    吴元保, 郑永飞, 龚冰, 赵子福, 2005. 北淮阳新开岭地区花岗岩锆石U-Pb年龄和氧同位素组成. 地球科学, 30(6): 659-672.
    引用本文: 吴元保, 郑永飞, 龚冰, 赵子福, 2005. 北淮阳新开岭地区花岗岩锆石U-Pb年龄和氧同位素组成. 地球科学, 30(6): 659-672.
    WU Yuan-bao, ZHENG Yong-fei, GONG Bing, ZHAO Zi-fu, 2005. Zircon U-Pb Ages and Oxygen Isotope Compositions for Granite at Xinkailing in the Beihuaiyang Zone and Their Significance. Earth Science, 30(6): 659-672.
    Citation: WU Yuan-bao, ZHENG Yong-fei, GONG Bing, ZHAO Zi-fu, 2005. Zircon U-Pb Ages and Oxygen Isotope Compositions for Granite at Xinkailing in the Beihuaiyang Zone and Their Significance. Earth Science, 30(6): 659-672.

    北淮阳新开岭地区花岗岩锆石U-Pb年龄和氧同位素组成

    基金项目: 

    国家自然科学基金项目 40334036

    详细信息
      作者简介:

      吴元保(1971—),男,博士,地球化学专业.E-mail:ybwu@ustc.edu.cn; yfzheng@Hstc.edu.cn

    • 中图分类号: P597

    Zircon U-Pb Ages and Oxygen Isotope Compositions for Granite at Xinkailing in the Beihuaiyang Zone and Their Significance

    • 摘要: 对大别造山带北麓的北淮阳新开岭地区岩浆岩进行了锆石阴极发光显微结构观察和SHRIMP法锆石微区UPb定年.在锆石阴极发光图像中, 一个花岗岩样品中的大部分锆石颗粒具有明显的初始岩浆振荡环带, 为典型的岩浆锆石, 少有蚀变的颗粒和/或区域; 而另一个花岗岩样品中的锆石虽然同样具有振荡环带, 但是大部分颗粒中心的初始岩浆环带被扰动, 指示这些锆石为岩浆锆石, 受到了较强的后期热液蚀变的改造.对锆石具有初始岩浆环带和溶蚀结构的区域分别进行SHRIMP法UPb微区定年结果表明, 这些岩浆岩的形成年龄为(820±4) Ma, 热液蚀变作用发生的时间为(780±4) Ma.新开岭地区新元古代花岗质岩石的形成和后期超固相热液蚀变作用分别对应于超大陆裂解之前的约830~795Ma岩浆活动和裂解过程中约780~745Ma的岩浆作用.单矿物激光氟化氧同位素分析结果表明, 这些岩浆岩具有非常低的δ18O值, 其中锆石为1.90‰~5.78‰, 石英为-2.88‰~-7.67‰, 斜长石为-4.01‰~-11.40‰.锆石和其他矿物之间表现出强烈的氧同位素不平衡, 而其他矿物之间则达到了氧同位素的再平衡.结合不同δ18O值锆石的内部结构特征, 认为该地区的热液蚀变作用为超固相条件下的高温热液蚀变.这一过程不但改变了石英等矿物的氧同位素组成, 同时也不同程度地改变了锆石的氧同位素组成, 所以这些样品中低δ18O值锆石可能是超固相条件下热液蚀变的结果.石英中具有异常低的δ18O值表明蚀变流体来源应为寒冷气候大气降水.所以, 新开岭地区亏损18O蚀变岩石的形成与裂谷岩浆作用和雪球地球事件相耦合的高温大气降水热液蚀变有关.

       

    • 图  1  北淮阳地区地质简图

      Fig.  1.  Sketch geological map of the Beihuaiyang zone

      图  2  新开岭地区地质图及采样点位置

      Fig.  2.  Geological map and sample locations of Xinkailing

      图  3  03BHY15和03BHY16中典型锆石CL图像

      Fig.  3.  Typical CL images of zircons with 206Pb/238U ages for granite samples 03BHY15 and 03BHY16 at Xinkailing in the Beihuaiyang zone

      图  4  新开岭花岗岩03BHY15和03BHY16锆石U-Pb一致曲线图

      Fig.  4.  Concordia diagrams of zircon U-Pb ages for granite samples 03BHY15 and 03BHY16 at Xinkailing in the Beihuaiyang zone

      图  5  新开岭地区岩浆岩锆石和石英氧之间氧同位素分馏与锆石δ18O值

      Fig.  5.  Plot of O isotope composition of quartz vs. oxygen isotope composition of zircon for granites at Xinkailing in the Beihuaiyang zone

      图  6  新开岭岩浆岩石英与其他矿物δ-δ图解

      矿物对氧同位素分馏方程据Zheng(1993a, 1993b, 1995)

      Fig.  6.  δ-δ plot of oxygen isotope compositions for quartz and other minerals for granite at Xinkailing

      表  1  北淮阳新开岭地区花岗岩SHRIMP锆石U-Pb年龄测定结果

      Table  1.   Zircon U-Pb ages for granite at Xinkailing in the Beihuaiyang zone

      表  2  北淮阳新开岭地区岩浆岩单矿物氧同位素组成及矿物对温度

      Table  2.   O isotope composition and temperature of mineral couple for grantites at Xinkailing in the Beihuaiyang zone

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    • 收稿日期:  2005-07-21
    • 刊出日期:  2005-11-25

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