首页   按字顺浏览 期刊浏览 卷期浏览 Geodynamic evolution of Korea: A view
Geodynamic evolution of Korea: A view

 

作者: Dominique Cluzel,   Jean‐Paul Cadet,  

 

期刊: Island Arc  (WILEY Available online 1992)
卷期: Volume 1, issue 1  

页码: 64-70

 

ISSN:1038-4871

 

年代: 1992

 

DOI:10.1111/j.1440-1738.1992.tb00058.x

 

出版商: Blackwell Publishing Ltd

 

关键词: geodynamic evolution;Korea;Ogcheon Belt

 

数据来源: WILEY

 

摘要:

AbstractEvidence for South Korean Palaeozoic geodynamic evolution is restricted to the Ogcheon Belt, which is a complex polycyclic domain forming the boundary between the Precambrian Gyeonggi Block to the northwest and the Ryeongnam Block to the southeast. Two independent sub‐zones can be distinguished: the Taebaeksan Zone to the northeast and the Ogcheon Zonesensu stricto.The Taebaeksan Zone and Ryeongnam Block display characteristic features of the North China palaeocontinent. This domain remained relatively stable during the Palaeozoic.In contrast, the Ogcheon Belt s. s. is a highly mobile zone that belongs to the South China palaeocontinent and corresponds to a rift that opened during the Early Palaeozoic. In lowermost Devonian times, the rift basin was closed and the Ogcheon Belt was structured in a pile of nappes. From the lack of suture in the Ogcheon Belt it can be inferred that the Gyeonggi Block belongs to the South China palaeocontinent. Thus, the boundary between the North China and South China blocks should be located to the north of Gyeonggi Block, that is, in the Palaeozoic Imjingang Belt. From the Middle Carboniferous, sedimentation started again on a weakly subsiding paralic platform located in the hinterland of the Late Palaeozoic orogen of southwest Japan. In the Late Carboniferous, increasing subsidence recorded extensional tectonics related to the opening of the Yakuno Oceanic Basin (southwest Japan). In the Middle Permian, the end of marine influences in the platform and emplacement of terrestrial coal measures, may be correlated with the closure of the oceanic area and subsequent ophiolite obduction. In Late Permian to Early Triassic times, the Honshu Block (the eastern palaeomargin of the Yakuno Basin) collided with Sino‐Korea.Post‐collisional intracontinental tectonics reached the Ogcheon Belt in the Middle Triassic (Songnim tectonism). Ductile dextral shear zones associated with synkinematic granitoids were emplaced in the southwest of the belt. In the Upper Triassic, the late stages of the intracontinental transcurrent tectonics generated narrow intramontane troughs (Daedong Supergroup). The Daedong basins were deformed during two tectonic events, in the Middle (?) and Late Jurassic. The Upper Jurassic to Lower Cretaceous basins (Gyeongsang Supergroup), that are controlled by left‐lateral faults, may have resulted from the same tectoni

 

点击下载:  PDF (715KB)



返 回