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大别山双河超高压榴辉岩中变质锆石；离子探针和微区结构研究

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陈道公,Etienne DELOULE,夏群科,吴元保,程昊. 大别山双河超高压榴辉岩中变质锆石；离子探针和微区结构研究[J]. 岩石学报, 2002, 18(3): 369-377.
引用本文: 陈道公,Etienne DELOULE,夏群科,吴元保,程昊. 大别山双河超高压榴辉岩中变质锆石；离子探针和微区结构研究[J]. 岩石学报, 2002, 18(3): 369-377.
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Chen DG,Deloule E,Xia QK,Wu YB and Cheng H. 2002. 1. Department of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China 2. CRPG CNRS,Nancy 54501,France. Metamorphic zircon from Shuanghe ultra-high pressure eclogite,Dabieshan: ion microprobe and internal micro-structure study.[J]. Acta Petrologica Sinica, 2002, 18(3): 369-377.
Citation: Chen DG,Deloule E,Xia QK,Wu YB and Cheng H. 2002. 1. Department of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China 2. CRPG CNRS,Nancy 54501,France. Metamorphic zircon from Shuanghe ultra-high pressure eclogite,Dabieshan: ion microprobe and internal micro-structure study.[J]. Acta Petrologica Sinica, 2002, 18(3): 369-377.
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大别山双河超高压榴辉岩中变质锆石；离子探针和微区结构研究

    • 中国科学技术大学地球和空间科学系，岩石地球化学研究中心，中国科学技术大学地球和空间科学系，中国科学技术大学地球和空间科学系，中国科学技术大学地球和空间科学系 合肥230026，南锡54501，法国，合肥230026，合肥230026，合肥230026

  • 基金项目:

    国家重点基础研究发展规划项目 (1999G0 75 5 0 3 )，国家自然科学基金 (4 0 0 3 3 0 1049973 0 19)联合资助

Metamorphic zircon from Shuanghe ultra-high pressure eclogite,Dabieshan: ion microprobe and internal micro-structure study.

    摘要
  • 对南大别双河超高压岩板榴辉岩中锆石进行了阴极发光、喇曼光谱、U- Pb和氧同位素离子探针微区分析。发现大部分锆石具有核边结构 ,其核和边有明显不同的 U ,Th,Pb含量、Th/ U比、2 0 6 Pb/ 2 38U年龄和δ1 8O值。锆石边部具有变质锆石的结构和化学特征 ,核部具有岩浆锆石向变质锆石变化的过渡特征。 17个点 U - Pb同位素分析中大多数为不一致年龄 ,由 14个正向不一致点所构成的不一致线与一致曲线的上、下交点年龄分别为 2 4 89± 2 5和 2 4 8± 16 Ma,它们代表了榴辉岩原岩形成时间和前进变质至峰期变质过程中原岩岩浆锆石重结晶和变质增生作用的时间 ,大别山变质锆石的成因是复杂的 ,它既可以是变质新生锆石 ,呈独立的颗粒或原岩岩浆锆石的增生边 ,也可以是由原岩锆石在固相或流体存在下的重结晶作用形成。不同程度的重结晶作用是超高压条件下双河榴辉岩原岩岩浆锆石发生的主要的物理化学变化 ,它导致锆石中 U、Th、Pb和Th/ U比的降低和岩浆振荡环带的消退
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修回日期:  2001-11-30
刊出日期:  2002-08-31

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