The Upper Permian Gohan Formation,a terrestrial stratum deposited in the foreland basin in central eastern Korea,provides information on the provenance,tectonic setting,and paleoclimatic conditions of the eastern marg...The Upper Permian Gohan Formation,a terrestrial stratum deposited in the foreland basin in central eastern Korea,provides information on the provenance,tectonic setting,and paleoclimatic conditions of the eastern margin of the Sino-Korean block(SKB)composed of the North China craton and the Korean Peninsula.Geochemical composition of Gohan mudrocks suggests that the source rocks consisted of a mixture of intermediate−mafic igneous rocks and some sedimentary rocks.The source terrain was situated in an Andean-type active continental margin setting.In the clay mineral composition,kaolinite predominates in the lower section,illite in the middle,and illite and chlorite in the upper section.Such upsection changes are consistent with the upward decrease of chemical weathering index,which indicates that the climatic conditions of Late Permian time changed from hot and humid to semiarid.展开更多
基金supported by the National Research Foundation of Korea(grant number 2014R1A2A2A01005404)H.Kwon acknowledges support from the SEES-BK21+Program at SNU.M.G.Kim also acknowledges support from the Korea Institute of Geoscience and Mineral Resources(GP2020-003)funded by the Ministry of Science and ICT,Korea.
文摘The Upper Permian Gohan Formation,a terrestrial stratum deposited in the foreland basin in central eastern Korea,provides information on the provenance,tectonic setting,and paleoclimatic conditions of the eastern margin of the Sino-Korean block(SKB)composed of the North China craton and the Korean Peninsula.Geochemical composition of Gohan mudrocks suggests that the source rocks consisted of a mixture of intermediate−mafic igneous rocks and some sedimentary rocks.The source terrain was situated in an Andean-type active continental margin setting.In the clay mineral composition,kaolinite predominates in the lower section,illite in the middle,and illite and chlorite in the upper section.Such upsection changes are consistent with the upward decrease of chemical weathering index,which indicates that the climatic conditions of Late Permian time changed from hot and humid to semiarid.
