扬子克拉通古元古代变质演化——来自黄陵穹窿石榴斜长角闪岩的证据-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

扬子克拉通古元古代变质演化——来自黄陵穹窿石榴斜长角闪岩的证据

Paleoproterozoic metamorphic evolution of the Yangtze Craton: Evidence from the Huangling Dome garnet-amphibolite

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DOI	10.20086/j.cnki.yskw.2023.0201
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2023, 42(2)
作者	付强，魏君奇*，范堡程，裴康达,
作者单位	1. 西北大学地质学系, 大陆动力学国家重点实验室, 陕西西安 710069; 2. 中国地质调查局西安矿产资源调查中心, 陕西西安 710100
摘要	为探讨扬子克拉通古元古代变质作用特征及其形成的构造背景,对黄陵穹窿北部石榴斜长角闪岩开展了岩相学、地球化学和年代学研究。结果表明,石榴斜长角闪岩中主要矿物有石榴子石、斜长石、角闪石、单斜辉石、石英、钛铁矿等,其中保留有3个阶段的不同变质期次的矿物组合,进变质矿物组合为角闪石+斜长石+石英+钛铁矿,峰期矿物组合为石榴子石+角闪石+斜长石+单斜辉石+石英+钛铁矿,退变质矿物组合为石榴子石+角闪石+斜长石+石英+钛铁矿。石榴斜长角闪岩原岩为亚碱性玄武岩,属于拉斑系列,Mg^#较低,表明其原岩经历了一定程度的分异作用。使用传统地质温压计计算不同变质阶段的温压条件分别为:进变质阶段, t=596~625℃, p=0.70~0.82 GPa;峰期变质阶段, t≈760℃, p≈1.35 GPa;退变质阶段, t=692~738℃, p=0.68~0.74 GPa, 并建立了一条顺时针的p-t轨迹, 显示出先升温升压至峰期阶段, 随后发生近等温减压的过程。这一p-t轨迹体现了汇聚板块边缘俯冲-碰撞的构造背景,对石榴斜长角闪岩中的锆石进行U-Pb定年,获得了2 008±11 Ma的谐和年龄,并结合该地区已有的变质年龄,共同揭示了扬子克拉通在古元古代参与了微陆块的拼接,是Columbia超大陆聚合的响应。
Abstract	In order to explore the characteristics of metamorphism and the tectonic setting in the Yangtze Craton, we carried out petrographic, geochemical and chronological studies on the garnet-amphibolite in the north of the Huangling Dome. The results show that the main minerals in the garnet-amphibolite are garnet, plagioclase, amphibole, cliniopyroxene, quartz and ilmenite, in which the mineral assemblages of 3 different metamorphic stages are retained. The prograde metamorphic stage is characterized by the assemblage of amphibolite+plagiospar+quartz+ilmenite and the peak metamorphic stage consists of garnet+amphibole+plagioclase+clinopyroxene+quartz+ilmenite, while the retrograde assemblage contains garnet+amphibole+plagioclase+quartz+ilmenite. The garnet-amphibolite protolith belongs to subalkaline tholeiite with low Mg^#, indicating that its protolith has experienced a degree of differentiation. By means of conventional geological thermometer, the temperature and pressure conditions of different metamorphic stages were calculated. We obtained the p-t conditions of 596~625℃ and 0.70~0.82 GPa for the prograde metamorphic stage, 760℃ and 1.35 GPa for the peak metamorphic stage, and 692~738℃ and 0.68~0.74 GPa for the retrograde metamorphic stage. Meanwhile, a clockwise p-t path was represented from these p-t conditions, showing the process of warming and pressurization to the peak and then a near isothermal decompression. This p-t path reflects the tectonic setting of subduction-collision at the convergent plate margin. U-Pb dating of zircons in the garnet-amphibolite yields a harmonic age of 2 008±11 Ma. Together with the existing metamorphic ages in the region, these ages reveal that the Yangtze Craton was involved in the splicing of microcontinental blocks during the Paleozoic, which might be a response of the Columbia supercontinent assembly.
关键词	扬子克拉通；黄陵穹窿；石榴斜长角闪岩；变质演化；变质时代；p-t轨迹
KeyWord	Yangtze Craton; Huangling Dome; garnet-amphibolite; metamorphic evolution; metamorphic age; p-t path
基金项目
页码	173-190

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付强，魏君奇*，范堡程，裴康达. 扬子克拉通古元古代变质演化——来自黄陵穹窿石榴斜长角闪岩的证据 [J]. 岩石矿物学杂志. 2023; 42; (2). 173 - 190.

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