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    威海地区超高压变质花岗片麻岩锆石U-Pb定年和氧同位素研究

    唐俊 郑永飞 吴元保 龚冰

    唐俊, 郑永飞, 吴元保, 龚冰, 2005. 威海地区超高压变质花岗片麻岩锆石U-Pb定年和氧同位素研究. 地球科学, 30(6): 692-706.
    引用本文: 唐俊, 郑永飞, 吴元保, 龚冰, 2005. 威海地区超高压变质花岗片麻岩锆石U-Pb定年和氧同位素研究. 地球科学, 30(6): 692-706.
    TANG Jun, ZHENG Yong-fei, WU Yuan-bao, GONG Bing, 2005. A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu. Earth Science, 30(6): 692-706.
    Citation: TANG Jun, ZHENG Yong-fei, WU Yuan-bao, GONG Bing, 2005. A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu. Earth Science, 30(6): 692-706.

    威海地区超高压变质花岗片麻岩锆石U-Pb定年和氧同位素研究

    基金项目: 

    国家自然科学基金项目 40334036

    中国科学院知识创新工程项目 KZCX3-SW-141

    详细信息
      作者简介:

      唐俊(1965一),男,博士,地球化学专业

      通讯作者:

      郑永飞,Email:yfzheng@ustc.edu.crl

    • 中图分类号: P597

    A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu

    • 摘要: 在苏鲁超高压变质带东北端山东威海地区皂埠镇发现锆石δ18O值低至-7.8‰左右的花岗片麻岩, 与前人在苏鲁超高压变质带西南端江苏东海青龙山地区发现的锆石δ18O值为-7‰~-9‰左右的花岗片麻岩一致.对这些低δ18O值花岗片麻岩进行了锆石SHRIMP法UPb定年和系统的激光氟化法矿物氧同位素分析, 结果对低δ18O值锆石成因和花岗片麻岩的原岩性质提供了制约.研究得到: (1) 这些低δ18O值锆石以新元古代岩浆锆石为主, 但部分岩浆锆石在印支期超高压变质作用过程中发生了不同程度的重结晶作用.δ18O值为-7.08‰的岩浆核锆石UPb定年得到的花岗片麻岩原岩谐和年龄和不一致线上交点年龄分别为(760±49) Ma和(751±27) Ma, 变质谐和年龄和不一致线下交点年龄分别为(232±4) Ma和(241±33) Ma, 指示其原岩为新元古代花岗岩并经历了印支期变质作用; (2) 锆石δ18O值在局部范围内变化于-7.76‰~5.40‰之间, 低δ18O值岩浆锆石表明它们是从新元古代低δ18O值岩浆中直接结晶形成, 锆石δ18O值的局部变化表明其原岩岩浆的氧同位素组成具有不均一性, 指示低δ18O值岩浆源区物质曾经在地表与极度亏损18O的大气降水发生过不同程度的高温水岩反应; (3) 低δ18O值花岗片麻岩在印支期板块俯冲和折返过程中基本没有与外部发生显著的氧同位素交换, 在退变质作用过程中花岗片麻岩内部缓冲流体对原岩岩浆锆石的δ18O值影响不大.威海皂埠镇地区和东海青龙山地区的花岗片麻岩在原岩时代、变质时代和氧同位素组成等方面基本相同, 指示它们应具有相同的原岩性质, 并经历了相同的变质作用和水岩相互作用过程.因此, 极度亏损18O的新元古代双峰式基性-酸性岩浆岩可能分布于整个大别-苏鲁造山带.

       

    • 图  1  胶东地块东部地质简图

      Fig.  1.  Sketch geological map of the eastern part of Shandong peninsula

      图  2  威海地区皂埠镇花岗片麻岩样品分布

      Fig.  2.  Sketch map of granitic gneiss sample locality at Zaobuzhen area in the Weihai region, eastern part of the Shandong peninsula

      图  3  威海地区皂埠镇花岗片麻岩显微照片

      a.03SD27 (正交偏光), 浅色矿物石英和长石呈他形不规则状, 石英和长石被定向拉长.钾长石发育格子双晶, 部分石英裂隙发育, 具波状消光, 总体具韧性剪切结构特征, 暗色矿物角闪石和黑云母也具有明显的定向性; b.04SD03 (单偏光), 花岗片麻岩中呈定向排列的黑云母, 见有半自形榍石零星分布于黑云母附近.浅色矿物也具有一定的定向性; c.03SD27 (单偏光), 花岗片麻岩中角闪石被黑云母交代, 角闪石和黑云母均定向分布; d.03SD27 (单偏光), 花岗片麻岩中零星分布于长石附近的红褐色石榴石, 石榴石内部见有来自于花岗片麻岩中残留的石英包裹体, 表明石榴石应该是在变质过程中形成.矿物符号: Qz.石英; Kfs.钾长石; Pl.斜长石; Bi.黑云母; Hb.角闪石; Gt.石榴石; Sph.榍石

      Fig.  3.  Photomicrograph of granitic gneiss at Zaobuzhen area in the Weihai region, eastern part of the Shandong peninsula

      图  4  威海地区皂埠镇花岗片麻岩锆石CL照片

      Fig.  4.  CL images of zircons from granitic gneiss at Zaobuzhen in the Weihai region

      图  5  威海地区皂埠镇花岗片麻岩锆石U-Pb谐和曲线图

      Fig.  5.  U-Pb concordant diagram of zircons from granitic gneiss at Zaobuzhen in the Weihai region

      图  6  威海地区皂埠镇花岗片麻岩石英-矿物对δ-δ图解

      Fig.  6.  δ-δ plot between minerals and quartz from granitic gneisses at Zaobuzhen in the Weihai region

      图  7  胶东地块东部新元古代花岗片麻岩锆石δ18O值直方图

      Fig.  7.  Histogram of the oxygen isotope composition for zircons from the Neoproterozoic granitic gneisses in the eastern part of the Shandong peninsula

      图  8  胶东地块东部新元古代花岗片麻岩锆石δ18O值与全岩SiO2含量相关图

      Fig.  8.  Diagram of relationship between zircon δ18O value and whole-rock SiO2 content for the Neoproterozoic granitic gneisses in the eastern part of the Shandong peninsula

      图  9  威海地区皂埠镇花岗片麻岩氧同位素剖面

      Fig.  9.  Profile for the oxygen isotope compositions of minerals from the granitic gneisses at Zaobuzhen in the Weihai region

      表  1  海地区皂埠镇花岗片麻岩03SD27锆石SHRIMP U-Pb同位素数据

      Table  1.   SHRIMP zircon U-Pb isotope data for granitic gneiss 03SD27 at Zaobuzhen in the Weihai region

      表  2  海地区皂埠镇花岗片麻岩全岩和单矿物氧同位素组成及温度

      Table  2.   Oxygen isotope compositions of mineral separates and whole rocks of granitic gneiss at Zaobuzhen in Weihai region and estimated temperatures

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