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    用接触变质作用标志初步判别北京房山岩体的岩浆侵位机制

    陈能松 陈冰寒 RogerMason 杨婷婷 夏彬 刘嵘 王国庆 徐冉

    陈能松, 陈冰寒, RogerMason, 杨婷婷, 夏彬, 刘嵘, 王国庆, 徐冉, 2018. 用接触变质作用标志初步判别北京房山岩体的岩浆侵位机制. 地球科学, 43(1): 99-108. doi: 10.3799/dqkx.2018.006
    引用本文: 陈能松, 陈冰寒, RogerMason, 杨婷婷, 夏彬, 刘嵘, 王国庆, 徐冉, 2018. 用接触变质作用标志初步判别北京房山岩体的岩浆侵位机制. 地球科学, 43(1): 99-108. doi: 10.3799/dqkx.2018.006
    Chen Nengsong, Chen Binghan, Roger Mason, Yang Tingting, Xia Bin, Liu Rong, Wang Guoqing, Xu Ran, 2018. Using Contact Metamorphic Criteria in Contact Aureole to Preliminarily Discriminate Magma Emplacement Mechanisms of Fangshan Pluton, Beijing. Earth Science, 43(1): 99-108. doi: 10.3799/dqkx.2018.006
    Citation: Chen Nengsong, Chen Binghan, Roger Mason, Yang Tingting, Xia Bin, Liu Rong, Wang Guoqing, Xu Ran, 2018. Using Contact Metamorphic Criteria in Contact Aureole to Preliminarily Discriminate Magma Emplacement Mechanisms of Fangshan Pluton, Beijing. Earth Science, 43(1): 99-108. doi: 10.3799/dqkx.2018.006

    用接触变质作用标志初步判别北京房山岩体的岩浆侵位机制

    doi: 10.3799/dqkx.2018.006
    基金项目: 

    中国地质大学(武汉)本科教学工程项目 ZL201610

    国家自然科学基金项目 41672060

    详细信息
      作者简介:

      陈能松(1956-), 男, 教授, 主要从事岩石学教学和变质作用地球动力学研究

    • 中图分类号: P581

    Using Contact Metamorphic Criteria in Contact Aureole to Preliminarily Discriminate Magma Emplacement Mechanisms of Fangshan Pluton, Beijing

    • 摘要: 近同心状房山岩体接触变质晕中变斑晶-基质关系与变质作用P-T轨迹样式的结合可以区分岩浆底劈式侵位与气球膨胀式侵位机制.例如,该房山岩体南侧接触变质晕中的下马岭组泥质变质岩的变斑晶-基质关系显示强烈的面状压扁应变变形,其变质作用P-T轨迹具等压加热趋势,综合前人成果估算该岩体4个依次侵位的岩石单元的最终就位岩浆结晶深度彼此近于一致,倾向于认为该岩体的岩浆侵位机制为气球膨胀式.

       

    • 图  1  房山岩体岩浆底劈侵位模式

      图据He et al.(2009)重绘并略作修改;图中展示了位于接触变质晕内环的高温剪切晕(HTSA)、由岩体中心向外辐射的陡倾面理构造、显著垂直上升的太古代岩片、边缘向斜构造和向斜压缩程度与深度的关系

      Fig.  1.  Magmatic diapir intrusive model for Fangshan pluton

      图  2  底劈型岩浆侵位岩体变质晕(a)和相应的变质P-T轨迹示意(b)

      图据He et al.(2009)简化

      Fig.  2.  Diapiric magma pluton (a) aureole and corresponding metamorphic P-T path (b)

      图  3  房山岩体和围岩构造地质简略

      第一次侵入体:Qηd.细粒闪长岩-斑状石英二长闪长岩单元;第二次侵入体:Cqd.粗粒石英闪长岩,Cpgd.粗斑花岗闪长岩,Mpgd.巨斑花岗闪长岩;虚线示房山岩体内部高温剪切带大致边界,点线示岩体西北缘内部固相线下变形带界线;产状和倾角单位为度

      Fig.  3.  Brief geological map of Fangshan pluton and country rock tectonics

      图  4  接触变质晕代表性显微构造照片

      a.夕线石-白云母带柱状红柱石核部为玫瑰红色的低温晶体相,边部为无色的中-高温晶体相,中-高温相红柱石末端多型转变为纤维状夕线石集合体,另一红柱石晶体的横断面显示十字包裹物迹线,由其分割的4个扇形区内可见断续排列的管状石英包体垂直于晶面;b.夕线石-白云母带的红柱云母片岩中的红柱石变斑晶和黑云母呈眼球状或鱼状,晶内面理呈平直状被晶外面理交切,显示变质结晶早于剪切面理;c.夕线石-钾长石带的眼球状钾长石变斑晶与夕线石共生,其核部由黑云母、石英和白云母组成的平直的晶内面理与由纤维状夕线石、黑云母等组成的晶外面理呈~45°相交;d.石榴子石呈自形-半自形晶,显示弱的溶蚀特征,核部的石英包裹体呈不定向或弱的直线状排列,近边部由一环状石英包裹体为界划分出两个带

      Fig.  4.  Representative microtectonic photos of contact aureole

      图  5  房山岩体接触变质晕夕线石-钾长石带的初步限定的P-T轨迹

      图中黑色轨迹由本文约束,红色轨迹据刘小丽(2015).底图据Mueller and Saxena(1977).反应资料:①And、Ky和Sil的相平衡是Mueller and Saxena(1977)Richardson(1968)Holdaway(1971)的实验成果和Ganguly的论据推断;②Pyp=And+3Q+H2O,据Kerrick(1968);③Chd+Al2SiO5=St+Q+H2O,据Richardson(1968);④(Fe-Mg)Chl+Ms=(Fe-Mg)St+(Fe-Mg)Bi+Q+H2O,据Hoschek(1969);⑤(Fe-Mg)St+Ms+Q=Al2SiO5+(Fe-Mg)Bi+H2O,据Hoschek(1969);⑥Ma+Q=Al2SiO5+K-fs+H2O,据Day(1973);⑦Fe-St+Q=Alm+Al2SiO5+H2O;⑧Fe-St+Fe-Bi=Fe-Cord+Ms,据Richardson(1968);⑨Ab+Ms+Q+H2O=L(熔体),据Storre and Karotke(1971);⑩Ar-Or-Q-H2O体系熔融开始,据Merrill et al.(1970);⑪ Ma+Q=L(熔体)+Al2SiO5+K-fs,据Storre(1972).矿物代号:Q.石英;Ab.钠长石;Or.正长石;Ms.白云母;Bi.黑云母;Chl.绿泥石;Chd.硬绿泥石;Alm.铁铝榴石;St.十字石;Cord.堇青石;K-fs.钾长石;And.红柱石;Ky.蓝晶石;Sil.夕线石

      Fig.  5.  P-T path preliminarily constrained for the sillimanite-K-feldspar zone in Fangshan pluton contact aureole

      表  1  岩浆气球膨胀与底劈侵位机制在围岩接触变质晕中的判别标志

      Table  1.   Criteria in contact aureole for discrimination of ballooning from diapiric intrusive mechanisms

      岩浆底劈机制 气球膨胀机制 房山岩体
      He et al.(2009) 本文和前人观察资料
      前进变质阶段拉伸线理 向岩体外辐射和陡倾 不发育 向外辐射和陡倾 另有不同的线理产状测量结果,可能是峰期后退变质作用相关的线理?
      变质峰期的面理构造 同心状 同心状 同心状 同心状
      前进变质阶段高温剪切晕 发育 不发育 发育 剪切明显,但可能不属前进变质阶段的同剪切构造变晶,强烈剪切面理发育在峰期变质之后变质峰期
      垂向位移 明显 不明显 明显 有岩体侵位前拆离断层剥露的不同意见
      边缘向斜 发育,为不对称型 可能发育,对称型或不对称 发育,为不对称型 发育,为不对称型
      前进变质阶段应变类型 剪切为主,压扁次之 压扁为主,剪切次之 剪切 前进变质以压扁为主,峰期变质后强烈剪切
      前进变质阶段变斑晶-基质关系 变斑晶主体发育同岩体侵位的上、下剪切相关的旋转型晶内面理,次之为平直的晶内面理 变斑晶主体发育同岩体侵位的平直的晶内面理,或与水平剪切相关的旋转型晶内面理 主体为平直晶内面理,少量为微弱的S-型或Z-型剪切面理变质作用
      P-T轨迹 具体视岩石所处部位而定,顶部为减压幅度较大的升温轨迹,边缘向斜内为明显增压的升温轨迹 总体为近等压升温或压力变化幅度较小,升温明显的P-T轨迹 未研究 近等压升温轨迹
      注:表据He et al.(2009)修改.
      下载: 导出CSV
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    • 收稿日期:  2017-10-13
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