Biostratigraphy and Paleoenvironment in Cheju Sedimentary Basin, Determined by Materials from Exploration Wells Geobuk-1 and Okdom-1     

Yun Hyesu  Yi Sangheon  Kim Jae-Ho  Yi Songsuk  Kim Gi-Hyoun  Park Dong Bae 《中国地质大学学报(英文版)》2000,11(2)

A micropaleontological analysis was made using materi-als from exploration wells Geobuk-1 (Td:2 72 2 .5m) andOkdom-1 (Td:2 90 3 .7m) for the purpose of biostratigraphicand paleoenvironmental interpretation of the Cheju sedimenta-ry basin.Two wells yield relatively abundant microfossilssuch as dinoflagellates,calcareous nannofossils,pollen andspores.The biostratigraphic and paleoenvironmental settingsanalyzed by microfossil assemblages seem to be closely relatedto the framework of the local t…  相似文献   

Micropaleontological and seismic observations for early developmental stage of the southwestern Ulleung Basin, East Sea (Japan Sea)   总被引：1，自引：0，他引：1  

Hyesu  Yun  Songsuk  Yi  Jinyong  Oh  Hyunsook  Byun  Kooksun  Shin 《Island Arc》2007,16(2):262-275

Abstract   The Ulleung Basin is located in the southwestern part of the East Sea (Japan Sea) and contains thick Neogene sediment. Detailed examination of the stratigraphic distribution of dinoflagellates was carried out on samples from the onshore Pohang Basin (E well) and two wells (Gorae I and Dolgorae VII) in the southwestern Ulleung Basin, to investigate the early evolution of the basin. The results show that thick syn-rift sediments mainly consist of terrestrial deposits and are widespread over the basin. This supports an extensional tectonic origin for the basin. The initiation of the deposits dates back to 17–16.4 Ma. Furthermore, well-preserved Eocene to Oligocene dinoflagellate taxa found in Miocene deposits of wells implies that the age of initial rifting might be Oligocene or earlier. Our results provide constraints for understanding the opening process of the East Sea.  相似文献