| 浙西南松阳地区斜长角闪岩变质作用演化及地质意义 |
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| 引用本文： | 郭腾达,郑常青,周喜文,董云峰,周枭,王照元,宋旸,石磊.浙西南松阳地区斜长角闪岩变质作用演化及地质意义[J].地球科学,2021,46(2):489-503. |
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| 作者姓名： | 郭腾达 郑常青 周喜文 董云峰 周枭 王照元 宋旸 石磊 |
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| 作者单位： | 1.吉林大学地球科学学院, 吉林长春 130061 |
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| 基金项目： | 中国地质调查局项目;国家自然科学基金项目 |
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| 摘 要： | 位于浙西南松阳地区八都杂岩的斜长角闪岩是构成前寒武纪基底的主要变质岩之一，但其原岩类型与变质演化特点目前尚不明确.开展了岩相学、矿物微区化学成分及全岩主微量元素研究，发现该斜长角闪岩的原岩类型为高铁拉斑玄武岩，可能形成于岛弧构造环境.石榴石核部保存有进变质信息，峰期变质阶段（M1）矿物组合为石榴石（边部）+浅闪石+斜长石（An=40~43）+单斜辉石+黑云母+钛铁矿；退变质阶段（M2）以阳起石+绿泥石+榍石±黑云母±钛铁矿等退变质矿物组合为特征.结合地质温压计、变质相平衡模拟，获得峰期变质阶段（M1）温压为710~740℃、800~850 MPa，退变质阶段（M2）温压为~440℃、~480 MPa；其变质演化过程具有顺时针型P-T演化轨迹.通过区域对比，八都杂岩斜长角闪岩变质作用时代可能为印支期，并经历了印支-华南-华北板块的俯冲碰撞过程.
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| 关 键 词： | 八都杂岩 斜长角闪岩 岛弧玄武岩 变质作用演化 浙西南 岩石学 |
| 收稿时间： | 2019-06-22 |
Metamorphism Evolution and Geological Significance of Amphibolite in Songyang Area of Southwest Zhejiang Province |
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| Guo Tengda,Zheng Changqing,Zhou Xiwen,Dong Yunfeng,Zhou Xiao,Wang Zhaoyuan,Song Yang,Shi Lei.Metamorphism Evolution and Geological Significance of Amphibolite in Songyang Area of Southwest Zhejiang Province[J].Earth Science-Journal of China University of Geosciences,2021,46(2):489-503. |
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| Authors: | Guo Tengda Zheng Changqing Zhou Xiwen Dong Yunfeng Zhou Xiao Wang Zhaoyuan Song Yang Shi Lei |
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| Affiliation: | (College of Earth Sciences,Jilin University,Changchun 130061,China;MNR Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Jilin University,Changchun 130061,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China) |
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| Abstract: | Amphibolite of the Badu complex in the Songyang area of Southwest Zhejiang Province is one of the major metamorphic rocks consisting of Precambrian metamorphic basement,However,its protolith and metamorphic evolution remain unclear.In this study,on the basis of the investigation of petrography,mineral chemistry and whole-rock major and trace element analyses,it is found that the protolith for amphilbolite belongs to high Fe tholeiite,which likely formed in an island-arc setting.The prograde metamorphic information is preserved in the garnet core,showing that peak metamorphic stage(M1)consists of garnet(rim)+edenite+plagioclase(An=40-43)+clinopyroxene+biotite+ilmenite and decompression metamorphic stage(M2)is characterized by the assemblage of actinolite+chlorite+sphene±biotite±ilmenite.By means of phase equilibrium simulation and traditional thermobarometer,it gets P-T conditions of 800-850 MPa and 710-740℃for M1,~480 MPa and~440℃for M2,respectively.These P and T conditions confine a typical clockwise P-T path.Through regional comparison,the amphibolite in Badu complex may have undergone Indosinian metamorphism and the amalgamation of the Indochina with South China and North China blocks. |
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| Keywords: | Badu complex amphibolite island arc basalt metamorphism evolution Southwest Zhejiang Province petrology |
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