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    北大别黄土岭长英质麻粒岩的原岩、变质作用及源区热事件年龄的锆石LA-ICPMS U-Pb测年约束

    陈能松 刘嵘 孙敏 李惠民 何蕾 王勤燕 张宏飞

    陈能松, 刘嵘, 孙敏, 李惠民, 何蕾, 王勤燕, 张宏飞, 2006. 北大别黄土岭长英质麻粒岩的原岩、变质作用及源区热事件年龄的锆石LA-ICPMS U-Pb测年约束. 地球科学, 31(3): 294-300.
    引用本文: 陈能松, 刘嵘, 孙敏, 李惠民, 何蕾, 王勤燕, 张宏飞, 2006. 北大别黄土岭长英质麻粒岩的原岩、变质作用及源区热事件年龄的锆石LA-ICPMS U-Pb测年约束. 地球科学, 31(3): 294-300.
    CHEN Neng-song, LIU Rong, SUN Min, LI Hui-min, HE Lei, WANG Qin-yan, ZHANG Hong-fei, 2006. LA-ICPMS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance. Earth Science, 31(3): 294-300.
    Citation: CHEN Neng-song, LIU Rong, SUN Min, LI Hui-min, HE Lei, WANG Qin-yan, ZHANG Hong-fei, 2006. LA-ICPMS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance. Earth Science, 31(3): 294-300.

    北大别黄土岭长英质麻粒岩的原岩、变质作用及源区热事件年龄的锆石LA-ICPMS U-Pb测年约束

    基金项目: 

    高校博士点基金项目 98049114

    国家自然科学基金项目 49972023

    国家自然科学基金项目 40202008

    中国地质大学地质过程与矿产资源国家重点实验室自由基金项目 MGMR2002-29

    详细信息
      作者简介:

      陈能松(1956-), 男, 教授, 从事造山带变质作用过程和年代学研究. E-mail: nengsongchen@cug.edu.cn

    • 中图分类号: P597

    LA-ICPMS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance

    • 摘要: 本研究应用激光剥蚀技术测定了北大别黄土岭高温-高压长英质麻粒岩锆石3个结构域的U-Pb年龄.变质锆石成因的碎屑锆石域的207Pb/206Pb年龄范围为(2493±54) Ma~(2500±180) Ma, 岩浆成因的碎屑锆石域的207Pb/206Pb年龄范围为2628~2690Ma, 其最大的206Pb/238U年龄为(2790±150) Ma, 变质增生或变质重结晶锆石域的不一致线上交点年龄为(2044.7±29.3) Ma.长英质麻粒岩的矿物组合成分、主量元素地球化学, 尤其是锆石副矿物内部结构特征显示其原岩为沉积岩.这表明, 麻粒岩原岩物质来自具有复杂热历史的蚀源区, 该蚀源区曾发生过~2.8Ga的岩浆作用和~2.5Ga变质作用, 因此其原岩的沉积年龄不应早于2.5Ga.高温-高压麻粒岩相变质作用的精确年龄为(2.04±0.03) Ga, 表明黄土岭麻粒岩是一个晚古元古代超高温变质岩之残块.

       

    • 图  1  大别造山带东段地质和构造单元简图(据Chen and Jahn, 1998; Wang et al., 1998; Hacker et al., 1998,略作修改)

      UAF-GF.高角闪岩相-麻粒岩相带; LAF.低角闪岩相带; EAF.绿帘角闪岩相带

      Fig.  1.  Schetch geological map showing tectonic units in eastern Dabie orogen

      图  2  (al+fm)-(c+alk)-Si图解(Simonen, 1953)

      Fig.  2.  (al+fm)-(c+alk)-Si discrimination diagram

      图  3  长英质麻粒岩锆石阴极发光图像

      Fig.  3.  Cathodoluminescence images of zircons from the felsic granulite

      图  4  变质增生和变质重结晶锆石(Ⅲ域锆石) 的U-Pb年龄谐和图

      图b是图a中椭圆区的放大

      Fig.  4.  Concordia diagram for metamorphic overgrowth or recrystallized zircons (domain Ⅲ zircons)

      表  1  黄土岭长英质麻粒岩岩石化学成分

      Table  1.   Petrochemical composition of the felsic granulite from Huangtuling

      表  2  锆石U-Pb同位素分析和年龄计算结果

      Table  2.   U-Pb zircon dating and isotope analysis

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    • 收稿日期:  2005-08-29
    • 刊出日期:  2006-05-25

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