Magnetostratigraphic Study for Lower Gyeongsang Super Group

京都大学与延世大学的合作研究项目--《高丽地区庆生超群下部磁性地层研究》是1996年作为日本文部科学文部省和韩国科斯夫资助的07044306号海外科学研究项目(联合研究)而开展的。庆生盆地是东亚陆相沉积盆地的一部分，形成于白垩纪和新近纪。该盆地出露在日本庆生盆地和平田-三根-山口地区之间，引起了日本和韩国地质学家的注意。虽然进行了多项调查，但仍有关于Debeat等人的证词。1996年2月29日至3月19日，在日本和韩国科学家的合作下，在韩国南部进行了古地磁样品的野外考察和采集，其结果如下：晋州地区(白垩纪)：52个地点(约260个岩样)；高丽地区(白垩纪)：56个地点(约280个岩样)；浦项地区(第三纪)：40个地点(约400个岩样)。将在京都和延世大学进行实验室和总结工作。详细的岩石磁学和古地磁研究可以给出采样点的年龄和极点位置。明确了庆生盆地不同次盆地的沉积时代、不同次盆地的地层对比以及朝鲜半岛南部白垩纪和第三纪的极移轨迹，并与日本西南部的沉积时间密切相关，从而可以确定盆地的沉积时间和盆地内各地层的对比。研究结果将为东亚地区古地磁极移轨迹的形成时间提供基本信息。

The cooperative research project-between Kyoto and Yonsei Universities on "Magnetostratigraphic Study for the Lower Gyeongsang Super Group in Goryeong-Uiryeong Area" was carried out in 1996 as the Oversea Scientific Research Project (Join Research) of Japan No. 07044306 financially supported by the Ministry of Education/Science, Sports and Culture of Japan and KOSEF in Korea.The Gyeongsang Basin is a part of non-marine sedimentary basin in East Asia which formed during the Cretaceous and Neogene. The basin, being exposed between the Gyeongsang basin and Hida-Sangun-Yamaguchi area in Japan, has been noticed by the both the Japanese and Korean geologists. Although a number of investigations, there are debeates on such as the times of deposition. This magnetostratigraphic study has been carried out in Gyeongsang Supergroup.Field examination and collection of paleomagnetic samples were made in Southern part of Korea from February 29 to March 19, 1996, in cooperative work with the collaborators of Japanese and Korean scientists, as follows :Jinju Area (Cretaceous) : 52 sites (about 260 rock samples)Goryeong Area (Cretaceous) : 56 sites (about 280 rock samples)Pohang Area (Tertiary) : 40 sites (about 400 rock samples)The laboratory and summarizing works will be done in Kyoto and Yonsei Universities.Detailed and careful rock magnetic and paleomagnetic studies may give the ages and the pole position of the sampling sites. And then, it is clear that the times of deposition, stratigraphic correlations among different sub-basins of Gyeongsang basin and polar wander path of Cretaceous and Tertiary periods for the Southern part of Korean Peninsula, in close association with that for Southwest Japan.The study may enable us to determine the time of deposition and correlate among formations included in each basins. The results will provide the foundermental informations on the time of formations, paleomagnetic polar wander path in East Asia.