Geologic correlation of Southwest Japan and Korean Peninsula

Petrochemical and Rb·Sr Geochronological数据被用于朝鲜半岛的东南部部分的上Cretaceous到Paleogene Granitic rock。本研究揭示了在活跃的大陆边缘的磁物质的临时和空间变异。Kajopluton位于Kyeongsang盆地外的所有岩石均为约85 Ma和约0.70840的高Sr初始比率。较高的初始Sratio是可以与那些Ryoke-type Granitic rocks相比的。While the Hawan、Deokdong和Girimusa Pluton，在Kyeongsang盆地进行了分析，显示了84 - 35 Ma的整个岩石同位素，初始Sratio为0.70542 - 0.70570。Kyeongsang盆地中的初始Srisopic比率与Kyeongsang盆地中的大多数Cretaceous-Paleogene花岗岩岩石相比较，也与位于日本西部地区的San'和九州北部的Cretaceous-Paleogene花岗岩岩石相比较良好。这是对Cretaceas的建议- ... More 古代花岗岩岩石在韩国南部的一部分和日本南部的一部分是从类似的源材料衍生出来的。新的和先前报告的年龄数据和初始的高级比率建议，即克里特岛-古生物学迁移到东海（日本海），在韩国和西南日本。在这一研究中获得的地理学和初始高级数据是一致的，即Eocene-Oligocene Magmatism可以被归类为一个地幔的上行，可能在东海（日本海）上启动了对其他方面的开放，对西南日本和京桑盆地的上游链路和次级环境的地理化学指示是对这一点的考虑。日本后弧区的上古生物群从Yoshimo和Sengoku形成的沙雷斯，以及京桑基地的Hayang群体类似于PAAS （后Archean Australian Shales）在REE其他痕迹元素。Th-Hf-Co和La-Th-Sc交替诊断。Kyeongsang Basin和日本Sengoku在西南部的形成之间的地质化学相似性建议他们在省关闭连接。目前对这些碎片中相对较高的硫含量和金属含量的研究表明，盐湖环境在较低的克里特岛期间的表现与气候有关。Less（低）

Petrochemical and Rb・Sr geochronological data are pesented for upper Cretaceous to Paleogene granitic rocks in the South Eastern part of the Korean Peninsula. This study revealed the temporal and spacial variation on magmatism at the active continental margine. The Kajopluton situated outside of the Kyeongsang basin have whole rock isochron ages of about 85Ma and a high Sr initial ratio of about 0.70840. The high initial Sr ratio are comparable with those of Ryoke-type Granitic rocks. While the Hwawan, Deokdong and Girimusa pluton, situated in the Kyeongsang basin, show whole rock isochron ages of 84 to 35Ma, with low initial Sr ratio from 0.70542 to 0.70570. The initial Sr isotopic ratios within the Kyeongsang basin are compatible with those of the majority of the Cretaceous-Paleogene granitic rocks in the Kyeongsang basin, and also compare well with those of Cretaceous-Paleogene granitic rocks in the San'in Belt and northern Kyushu, southwest Japan. This suggests that the Cretaceous- … More Paleogene granitic rocks in the southeastern part of Korea and in the southwestern part of Japan were derived from isotopically similar source materials. The new and preveously reported age data and initial Sr ratio suggest that the Cretaceous-Paleogenemagmatism migrated to a narrow belt along the East Sea (Japan Sea), in both Korea and southwest Japan. The geochronological and initial Sr isotope data obtained in this study are consistent with the suggestions that the Eocene-Oligocene magmatism can be ascribed the upwelling of a mantle plume, which probably initiated the opening of the East Sea (Japan Sea)On the other hand, geochemical indication of provenance linkage and sedimentary environment of the Lower Cretaceous of Southwest Japan and Kyeongsang basin were considered. Shales from the Yoshimo and Sengoku formation in the upper Paleozoic in the back arc area in Japan and Hayang group of the Kyeongsang basin are similar to PAAS (Post Archean Australian shales) in REE.other trace elements. Th-Hf-Co and La-Th-Sc ternary diagrams. Geochemical similarity between the Kyeongsang basin and the Sengoku formation of Southwest Japan suggests their close linkage in the provenance. Present examination of relatively higher sulfer content and metal enrichment in these shales indicates appearance of saline lake environment in arid climate during the Lower Cretaceous. Less