Adakitic Signatures of the Jindong Granitoids

진동화강암체의 아다카이틱한 특성

  • Wee, Soo-Meen (Dept. of Earth Sciences, Korea National Univ. Education) ;
  • Kim, Yun-Ji (Dept. of Earth Sciences, Korea National Univ. Education) ;
  • Choi, Seon-Gyu (Dept. of Earth & Environmental Sciences, Korea Univ.) ;
  • Park, Jung-Woo (Dept. of Earth & Environmental Sciences, Korea Univ.) ;
  • Ryu, In-Chang (Dept. of Geology, Kyeongbuk National Univ.)
  • 위수민 (한국교원대학교 지구과학교육과) ;
  • 김윤지 (한국교원대학교 지구과학교육과) ;
  • 최선규 (고려대학교 지구환경시스템과학과) ;
  • 박정우 (고려대학교 지구환경시스템과학과) ;
  • 유인창 (경북대학교 지질학과)
  • Published : 2007.04.28

Abstract

The eastern extension of the Cordilleran-type orogenic belt continues from southeastern China to the Chukot Peninsula through the Korean Peninsula. The Gyeongsang basin, located in the southeastern part of the Korean Peninsula and the Inner Zone of southwest Japan are characterized by extensive distribution of Cretaceous to Tertiary I-type calc-alkaline series of intrusive rocks. These intrusive rocks are possibly the result of intensive magmatism which occurred in response to the subduction of the Izanagi Plate beneath the northeastern part of the Eurasian Plate. The Jindong granitoids within the Gyeongsang basin are reported to be adakites, whose signatures are high $SiO_2,\;Al_2O_3$, Sr, Sr/Y La/Yb and, low Y and Yb contents. The major and trace element contents of the Jindong granitoids fall well within the adakitic field, whereas other Cretaceous granites in the same basin are plotted in the island arc ADR area in discrimination diagrams. Chondrite normalized REE patterns show generally enriced LREEs (La/Yb)C = 3.6-13.8) and slight negative to flat Eu anomalies. The mean Rb-Sr whole rock isotopic age of the Jindong granitoids is $114.6{\pm}9.1$ Ma with an initial Sr isotope ratio of 0.70457. These values suggest that the magma has mantle signature and intruded into the area during Early Cretaceous. The Jindong granitoids have similar paleogeographical locations, paleotectonic environments and intrusion ages to those of the Shiraishino granodiorites of Kyushu Island and the Tamba granitoids of San'yo belt located on southwestern Japanese arc.

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