Late Pliocene–recent tectonic setting for the Tianchi volcanic zone, Changbai Mountains, northeast China |
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| Authors: | Yu Wang Chunfeng Li Haiquan Wei Xinjian Shan |
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| Institution: | a Geologic Laboratories Center and Department of Geology, China University of Geosciences, Xueyan Road 29, Haidian District, Beijing 100083, People's Republic of China;b Seismological Bureau of Jilin Province, Changchun 130022, People's Republic of China;c Institute of Geology, China Seismological Bureau, Beijing 100029, People's Republic of China |
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| Abstract: | Mafic volcanic rocks have erupted in the Tianchi volcanic zone, Changbai Mountains, northeast China, since late Pliocene time. The zone formed in an extensional environment during early-middle Cenozoic time, and in a compressional environment during late Cenozoic. Crustal thickness (about 40 km) in the Changbai Mountains is larger than the regional average of 34–36 km to the northwest and southeast. The conduit for magma upwelling was not coincident with the NE-striking regional faults, but seem to be confined to a deep-seated NW–WNW-striking fault zone. Since the late Pliocene, the Tianchi volcanic zone was subjected to crustal uplift within an intracontinental, weakly compressional environment (with minor WNW–ESE shearing) related to the westward subduction of the West Pacific plate. The nature of this volcanism is not typical of active, subduction-related continental margin volcanism. The magmatic evolutionary process evolved from trachybasalt through basaltic trachyandesite, trachyte, and pantellerite. |
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| Keywords: | Tianchi volcanic zone Tectonic setting Fault zone Volcanic eruption Late Pliocene– Recent |
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