Reviews on the Paleozoic-Mesozoic granitoids and sedimentary rocks in North Korea

서지정보

· 발행기관 : 대한지질학회
· 수록지 정보 : 지질학회지 / 57권 / 4호 / 523 ~ 544페이지
· 저자명 : Yan-Bin Zhang, Ming-Guo Zhai, Fu-Yuan Wu, Xiao-Hui Zhang, Qiu-Li Li, Peng Peng, Lei Zhao, Li-Gang Zhou

초록

The lack of relevant geological information and data in North Korea greatly hampers understanding of the geological evolution of the Korean Peninsula. This paper reviews the studies of the Paleozoic-Mesozoic granitoids and sedimentary rocks in North Korea. (1) Phyongnam Basin comprises lower Paleozoic Hwangju Supergroup (Hwangju and Bopdong Groups) and Upper Paleozoic Pyongan Supergroup. δ13C values in the Cambrian Hwangju and lower Bopdong Groups fluctuate little (-4~+4‰), but frequently. (2) The middle Paleozoic Imjin Group only distributed in the southern margin of the Phyongnam Basin and deposited in Late Devonian.
Similar detrital zircon age spectra of representative Paleozoic sequences in the Korean Peninsula and the North China Craton indicates that these two tectonic units might experience similar tectonic evolution, and the Imjingang Belt might not be the eastward extension of the Qinling- Dabie-Sulu Collisional Belt. (3) The late Permian volcano-sedimentary strata Tuman Group is well developed in the Tumangang Belt and Kwanmo Submassif. (4) The Mesozoic sedimentary strata are mostly developed in continental faulted basins, and consist of lower Jurassic Taedong, upper Jurassic-lower Cretaceous Jasong, and lower-upper Cretaceous Taebo Systems. The volcanic activity within 136-110 Ma in North Korea was significant. (5) Phanerozoic granitoids and related igneous rocks with age ranges of 265-213 Ma, 199-163 Ma to 136-83 Ma are widely distributed in North Korea. Except for the absence of early Cretaceous magmatism (136-110 Ma) in South Korea, other magmatic events can be comparable to those in South Korea. (6) The age patterns and geochemical features of Phanerozoic granites in the Tumangang Belt and Kwanmo Submassif are similar to those of the eastern part of the Central Asian Orogenic Belt. (7) The Triassic granitoids in North Korea were most likely formed in intracontinental rift environment and were also influenced by adjacent blocks from the north and south of the Korean Peninsula.

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