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Mineralogical Characteristics of Marine Sediments Cores from Uleung Basin and Hupo Basin, East Sea

동해 울릉분지와 후포분지 해양 퇴적물 코어의 광물학적 특성

  • Lee, Su-Ji (Department of Geology, Kyungpook National University) ;
  • Kim, Chang-Hwan (Dokdo Research Center, East Sea Research Institute, KIOST) ;
  • Jun, Chang-Pyo (Department of Geology, Kyungpook National University) ;
  • Lee, Seong-Joo (Department of Geology, Kyungpook National University) ;
  • Kim, Yeongkyoo (Department of Geology, Kyungpook National University)
  • 이수지 (경북대학교 지질학과) ;
  • 김창환 (한국해양과학기술원 동해연구소 독도전문연구센터) ;
  • 전창표 (경북대학교 지질학과) ;
  • 이성주 (경북대학교 지질학과) ;
  • 김영규 (경북대학교 지질학과)
  • Received : 2015.03.11
  • Accepted : 2015.03.27
  • Published : 2015.03.31

Abstract

This study was carried out in order to investigate the mineralogical characteristics of the core sediments (03GHP-02 and HB13-2), obtained from the Ulleung Basin and Hupo Basin, Korea. The results on mineral compositions, clay mineral compositions, and the total contents and sequential extraction of different fractions of the phosphorus in core samples showed that those values are different in two cores and also at different depths. In both samples, mineral compositions were the same, composed mainly of quartz, microcline, albite, calcite, opal A, pyrite, and clay minerals (illite, chlorite, kaolinite, and smectite). However, the sample from Hupo Basin contains more opal A. Both samples, especially the ones from Hupo Basin contains more smectite than those reported from East Sea, indicating the influence of paleo-Hwangwei River and the Tertiary Formation of Korea Peninsula. For the samples from Uleung Basin, at 0.7-3.5 m range in depth, the low content of opal A and the low illite crystallinity index can be inferred to indicate the relatively cool climate, corresponding to the ice age. Also, the content of total phosphorus was low in those samples. It was reported that East Sea at that time was isolated from the neighboring seas due to the decrease of the sea level, and as a result, the influx of sediments was supposed to be little through the strait and rivers. For the samples from Hupo Basin, there is no significant changes in clay mineral composition and the distribution of phosphorus with increasing depth. This little change can be interpreted to indicate that the sediments comprising the core might be deposited in a relatively short period of time or deposited in sedimentary environment in which there's no significant changes in sediment supplies. The values of crystallinity index of clay minerals are high in those samples, indicating that it was relatively warm during that time. Although the increase of fluctuation pattern can be observed, showing that the climate of this period often changed, it is supposed that it was generally warm.

Acknowledgement

Grant : 동해 심해유입물질 특성과 서식생물 영향연구 I, 동해 중부연안 해저 Eco-mapping 및 환경특성 연구

Supported by : 한국해양과학기술원, 한국연구재단

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