华北克拉通2.1～1.7Ga地质事件群的分解和构造意义探讨
本文关键词：华北克拉通2.1～1.7Ga地质事件群的分解和构造意义探讨，，由笔耕文化传播整理发布。
《Acta Petrologica Sinica》 2004-06
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华北克拉通2.1～1.7Ga地质事件群的分解和构造意义探讨
ZHAI MingGuo Key Laboratory of Mineral Resources.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 10029,China
Recently, the geological events and their significance during period of ca 2.1～1.7 Ca are attracted as an interesting study focus. Our study shows that a series of geological evenls occurred in the Norlh China cralon at that time do not belong to a simple orogenic or rifting tectonic process. These events could be divided into two event-suhgroups, i.e. 2.1～1.9 Ga orogenic event subgroup and 1.85～1.7 Ga rift event-subgroup. The major indications of the 2.1～1.9 Ga event-subgroup are listed below:(1) several mohile behs developed within the Neoarchean craton; (2) strong folded deformation and metamorphism of greenschist-epidote amphibolite facies; (3) magmatic intrusion of K-granite sills and Mafic dyke swarm. This event-subgroup is represented by the Jinyu and Liaohe mobile belts, and was possihly related to the Pre-Rodinia (Columbia) orogeny. This event-subgroup ended at ca 1.93 Ga. The 1.85～1.7 Ga event-subgroup is a rifting event. Its major indications are: (1) mantle upwelling and lower crust uplifting to the surface at whole, accompanied by strong migmatization and ductile deformation; (2) high-pressure granulites underwent moderatepressure granulite-amphibolite facies overprint with 1820～1800 Ma and 1790～1760 Ma metamorphic ages and decompressional P-T path; (3) rifting event closely followed the basement uplifting, and the Xionger-Angou-Zhongtiao rift and Yanshan rift are of a same rift regime: (4) old mantle rapidly became richer at ca 1900～1760 Ma from a depleted composition. Therefore, we suggest that the ～1.8 Ga event-subgroup represents a continental geological process within craton: an upwelling mantle caused the craton basement uplifting at whole and closely followed by an aulacogen system. Our new study shows that mafic dykes can be divided into two types: metamorphosed and unmetamorphosed. The former has 2150 Ma forming age and 1970～1930 Ma (high-pressure granulite facies) and 1830 Ma (granulite facies) metamorphic ages. The later has 1780～1750 Ma forming age which is similar to that of amphibolit facies overprint of the metamorphosed dykes. The unmetamorphosed dykes obviously intruded after the craton basemenl uplifting.
【Key Words】：
【Fund】：
基金重点项目(40234050);;
中科院创新项目(KZCX1-07)资助
【CateGory Index】：
P542
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本文关键词：华北克拉通2.1～1.7Ga地质事件群的分解和构造意义探讨，由笔耕文化传播整理发布。
本文编号：184027
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