| 北秦岭官坡地区柯石英榴辉岩变质作用的P－T－t轨迹 |
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| 作者单位： | 西安地质学院资源系 |
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| 摘 要： | 根据矿物包裹和替代关系以及共生组合规律，北秦岭官坡地区柯石英榴辉岩的变质作用演化可划分为５个阶段，即前榴辉岩相的绿帘角闪岩相、榴辉岩相、后榴辉岩相的角闪岩相、绿帘角闪岩相和绿片岩相。Ｓｍ－Ｎｄ同位素定年显示，北秦岭柯石英榴辉岩于４００±１６Ｍａ沿朱夏断裂被推覆上升，Ｐ－Ｔ－ｔ轨迹的地球动力学成因可能与扬子和华北陆块间的俯冲－碰撞作用有关。
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| 关 键 词： | 柯石英榴辉岩 P－T－t轨迹 Sm－Nd同位素年龄 北秦岭 |
METAMORPHIC P-T-t PATH FOR THE COESITE ECLOGITES FROM THE GUANPO AREA, NORTHERN QINLING MOUNTAIN |
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| Authors: | Zhao Donglin |
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| Abstract: | On the studies of the relations of mineral generations and conversion of mineral assemblages, the metamorphic evolution of the coesite eclogite in Guanpo area, northern Qinling mountain, may be divided into five stages: epidote-amphibolitic factes of the pre-eclogite factes, coesite eclogite factes, amphibolitic factes of the post-eclogite factes, epidote-amphibolitic factes and greenschist factes. The. Sin-Nd dating of the rock specimen yields an excellent isochron, indicating that the coesite eclogite was uplifted along Zhuxia fault at about 400 Ma ago. The geodynamic process for the P-T-t path of coesite eclogite might be related to the uderthrust collision between Yangtze and Huabei massifs. |
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| Keywords: | Coesite eclogite P-T-t path Sin-Nd isochron age Northern Qinling mountain |
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