Regional metamorphism and tectonic evolution of the Inner Mongolian suture zone

Journal of Metamorphic Geology - Tập 11 Số 4 - Trang 511-522 - 1993
Tang Kedong1, Yan Zhuyun1
1Shenyang Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, Beiling Street, Shenyang, Liaoning 110032, China

Tóm tắt

Abstract Regional metamorphism in central Inner Mongolia has occurred during four different periods: the middle Proterozoic, the early Palaeozoic, the middle Palaeozoic and the late Palaeozoic tectonic cycles. The middle Proterozoic and late Palaeozoic metamorphic events are associated with rifting and are characterized by low‐pressure facies series. The early Palaeozoic metamorphism occurred in two stages: (1) subduction zone metamorphism resulted in paired metamorphic belts in the Ondor Sum ophiolite and Bainaimiao island arc complex; and (2) orogenic metamorphism occurred during the collision of an island arc with the continent. Two types of middle Palaeozoic metamorphism are represented: (1) subduction zone metamorphism, which affected the melange; and (2) orogenic metamorphism that resulted from continent–continent collision.

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