Characteristics Of Paleozoic Sedimentary From East China-Korean Peninsula And Its Tectonic Evolution

The study area is located in the eastern part of Liaoning Province, southeast ofJilin Province and the Korean Peninsula, in the tectonic position, which includes theeastern Sino-Korean craton (east to the Tan-Lu fault zone) and the southern part ofJilin-Yanbian fold belt. The area had been undergone interaction with the Northeastmicro-plate group and the North China plate. Furthermore, in addition to activity ofthe Pacific plates, therefore the geological structure is very complex and special. Forthe Eastern China and the Korean Peninsula Paleozoic stratigraphy and tectonicevolution, a comparatively large amount of research work have been carried out, andobtained the abundant information and understanding.In recent years, the studies of stratigraphic paleontology and petrology havebeen carried out; such as discovery of the Early Carboniferous and Devonian fossilsin eastern part of Pyongyang of the Pyongnam Basin, detailed study about the fossilassemblage of the Rimjin Group in the Rinjingang belt and systematic research of theGyeryongsan brachiopod fauna in the Hambuk Massif. These studies have provided alot of new information and understanding on the Paleozoic sedimentary characteristicsand geological attributes of the Korean Peninsula and the specific location of theboundary with the northeastern Sino-Korean craton and the southeastern Jilin-Yanbianfold belt.Since the eclogite have been continuously found in the Dabie-Sulu area, theSulu orogenic belt whose east extends to the Korean Peninsula has become toattentional scientific problems for the home and foreign researchers. Discovery of theeclogites (Hongseong complex) at the middle-western Gyonggi Massif, KoreanPeninsula deepened the discussion on its geological attribution. However, thecomplexity of the geological structure of the Korean Peninsula produced manydifferent points of view. Therefore, in this paper we have carried out the detailed comparative research on the development of the Paleozoic sedimentary basin,lithostratigraphic and biostratigraphic characteristics in the Late Ordovician to EarlyCarboniferous into the sedimentary basin, the geological properties of the Rimjingangbelt and Rimjin Group and the Late Paleozoic tectonic evolution in the easternJilin-Yanbian-Hambuk district and etc.1. Correlation of evolution of the sedimentary basins between eastern NorthChina and the Korean Peninsula in the Late Ordovician-Early Carboniferous.Late Ordovician-Middle Silurian series exists only in the Pyongnam Basin inKorean Peninsula, basically composed by marine sediments. Although theirdistribution area is small, but the strata comparatively thick and without lithologicalfacies changes, it therefore can be considered that firstly the deposited area is broaderthan the present distribution area, and later the crustal movements had caused erosionand denudation, and up to now has been changed into a relatively small area of theSongnim, Singye, Goksan and Pobdong districts.From the Namchang Member of the Mandal Formation (previously consideredMiddle Ordovician) in Sungho district of eastern Pyongyang, we can consider thisincludes the geological periods from the late of the Early Carboniferous to early of theLate Carboniferous strata. Moreover the Devonian fossils discovered from the UnhakMember prove that Devonian rocks and strata exist in this area, and further, theDevonian System had been also developed at the northern Haeju subsidence zone.In the Middle Paleozoic, paleogeographic environment and tectonic evolution ofthe central and eastern Sino-Korean Block have some differences. The scale ofsedimentary basin and its evolution in different regions are dissimilarity. In the Singye,Goksan and Pobdong districts, the Ordovician and Silurian System had beencontinuously deposited, whereas the Devonian System and Early Carboniferous Seriesdeveloped in the eastern Pyongyang region.2. The study on the geological structures of the Rimjingang belt, thecharacteristics of biostratigraphy and geological age of the Rimjin Group andcorrelation study between the Rimjingang belt and the Dabie-Sulu orogenic belt.The Rimjin group composed of thick marine-continental volcano-clasticsedimentary rocks completely differs from the Paleozoic stabilization craton-typestrata, and also from the Late Devonian Series of the Yangtze and South China Block.A detailed study on the fossil assemblage of the Rimjin Group shows itsgeological age corresponds from Middle Devonian Givetian to the Upper Devonian Famennian, and is divided into8biostratigraphic zones. Wutong Formation in theLower Yangtze Block is not well compared with Rimjin Group throughout thecomposition of fossil assemblages, lithological characteristics, property ofsedimentary basin and depositional environment.Based on internal structure, sedimentary facies and metamorphic characteristics,the Rimjingang belt does not show conditions and characteristics of the plate collisionorogen, but probably belongs to the intracontinental rift. The entire Korean Peninsulais therefore included in the Sino-Korean craton, and the Rimjingang belt is not thecollisional orogenic belt between the Sino-Korean and the Yangtze plates.3. Integrated correlation study on the Jilin-Yanbian fold belt andnortheastern Korea Hambuk Massif.The Gyeryongsan Permian brachiopod fauna in Korea and Zhesi Permianbrachiopod fauna in North China is obviously different; however, the GyeyongsanPermian brachiopod fauna significantly correlates to the Fanjiatun Formation in theeastern Jilin region, especially Miaoling Formation in the Yanbian region. In addition,the basement, which have been developed in both of the Chinese Jilin-Yanbian foldbelt and the northeastern Korean Hambuk massif, are the Proterozoic strata and rocks,and the Archean rocks are not exposed. In the late Paleozoic, sedimentaryenvironment and magmatic activity of the eastern Jilin-Yanbian region in China issimilar to Hambuk region in the northeastern Korean Peninsula. Moreover, theboundary fault between the Hambuk massif and Rangnim massif in the KoreanPeninsula-Susongchon fault is connected to the eastern end of the suture zonebetween the North China Block and the Jilin-Heilongjiang orogenic belt-GudongheFault Zone. Therefore, the eastern part of Jilin-Heilongjiang orogenic belt and thenortheastern Korea Hambuk massif should be belong to the same tectonic unit in thelate Paleozoic period.