Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Characteristics and Provenance of Heavy Minerals in the Yellow Sea and Northern East China Sea

황해 및 동중국해 북부의 중광물 특성과 기원

  • Koo, Hyo Jin (Department of Geology and Research Institute of Natural Science, Gyeongsang National University) ;
  • Lee, Bu Yeong (Gyeongsangnamdo Ramsar Environmental Foundation) ;
  • Cho, Hyen Goo (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
  • 구효진 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 이부영 (경상대학교 지질과학과 및 기초과학연구소) ;
  • 조현구 (경상대학교 지질과학과 및 기초과학연구소)
  • Received : 2020.06.29
  • Accepted : 2020.09.13
  • Published : 2020.10.28
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Abstract

The Yellow Sea and northern East China Sea contain a transgressive sand layer. Numerous sedimentary studies have been carried out in these sand deposits using seismic exploration and core sediment techniques, but few mineralogical studies have been reported. The major purposes of this study are to describe the distributions of heavy minerals throughout the Yellow sea and northern East China Sea and to identify the provenance of coarse sediments using the mineral chemistry. Eight heavy mineral species were identified in the study area (epidote, amphibole, garnet, zircon, sphene, rutile, apatite, and monazite). The study region was divided into six areas (areas A to F) based on heavy mineral distributions and sampling locations. In mineral chemistry, the amphiboles present are classified as edenite and hornblende in the calcic amphibole group, and the garnets are identified primarily as almandine in the pyralspite group. A combined data set of heavy mineral distributions and mineral chemistry showed clear differentiation of the characteristics of the six classified areas, enabling determination of provenance and sedimentary environment. Area A and B in the eastern Yellow Sea were originated from the Korean peninsula, and these regions showed different heavy mineral characteristics by tidal current and coastal current. In addition, monazite was only found in the area B and could be used as an indicator from the southwestern Korean peninsula. Area D and E in the western Yellow Sea showed the characteristics of sediments originating from the Huanghe, and sediment in the area E was derived from the Changjiang. Area C in the northern East China Sea appeared to have Changjiang-origin sediment, and abundant apatite indicated that area C was formed close to the Last Glacial Maximum.

황해와 동중국해 북부에는 해퇴에 의한 사질 퇴적체가 분포한다. 이러한 사질 퇴적체들은 지구물리 탐사와 코어를 이용한 다양한 연구들이 수행되었지만, 광물학적 연구는 거의 수행되지 않았다. 이번 연구에서는 황해와 동중국해 북부지역의 중광물 특성을 파악하고, 광물화학적 분석을 통해 조립질 퇴적물의 기원지와 퇴적환경을 알아보고자 하였다. 연구지역에서는 8종의 중광물(녹염석, 각섬석, 석류석, 저어콘, 스핀, 금홍석, 인회석, 모나자이트)이 확인되었으며, 중광물의 분포와 퇴적물의 특성을 기반으로 6개의 지역(area A-F)으로 구분되었다. 연구지역의 각섬석은 칼슘 각섬석군의 에데나이트와 보통각섬석으로 분류되었으며, 석류석은 주로 파이랄스파이트군의 알만딘으로 확인되었다. 중광물 조성과 광물화학 결과는 구분된 6개의 지역에서 뚜렷한 차이를 보였으며, 기원지와 퇴적환경을 결정하는데 이용되었다. 황해 동부의 area A와 B는 한반도 기원의 퇴적물로 판단되며, 두 지역은 조류와 연안류에 의해 서로 다른 중광물 특성을 나타낸다. 또한, 모나자이트는 area B에서만 발견되며, 한반도 서남부 기원지의 지시자로 이용될 수 있다. 황해 서부의 area D와 E는 황하 기원 퇴적물의 특성을 보이며, area E는 양쯔강 퇴적물로 구성된다. 동중국해 북부의 area C는 양쯔강 기원의 중광물 특성을 보이며, 해수면 상승과 함께 고하구의 해퇴에 의해 형성되었다. 또한, 풍부한 인회석은 area C의 퇴적 시기가 최후빙기극대기와 가까움을 나타낸다.

Keywords

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