[논문]북극 척치해 아라온 마운드 퇴적물의 기원지에 관한 연구

장정규; 구효진; 조현구

doi:10.22807/kjmp.2021.34.1.15

북극 척치해 아라온 마운드 퇴적물의 기원지에 관한 연구
Provenance of the Sediments of the Araon Mound in the Chukchi Sea, Arctic Ocean 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.34 no.1, 2021년, pp.15 - 29

장정규 (K-water 연구원) , 구효진 (경상대학교 지질과학과 및 기초과학연구소) , 조현구 (경상대학교 지질과학과 및 기초과학연구소)

초록
AI-Helper

북극해는 기후 변화에 따라 북극의 해빙과 빙상의 분포가 달라지며 쇄설성 퇴적물 내 광물의 특성이 변화한다. 따라서 해빙이나 빙산에 의해 운송된 해양 퇴적물을 연구하는 것은 지구 기후 변화를 이해하는 데에 매우 중요하다. 본 연구에서는 척치해저고원의 아라온 마운드에서 채취한 4개의 중력코어와 아라온 마운드 사이 사면에서 채취한 1개의 중력코어를 사용하여, 벌크광물조성, 점토광물조성, 빙운쇄설물 연구를 통해 쇄설성 퇴적물의 기원지를 알아보고 이를 바탕으로 서북극해의 고환경 변화를 재구성하였다. 코어 퇴적물들은 갈색, 회색, 녹회색을 띠며 서북극해에서 나타나는 간빙기/빙기 순환에 따른 퇴적물 색의 특성을 잘 나타내고 있다. 척치해저고원에서 획득한 코어 퇴적물을 광물 특성과 주변에서 수행된 기존 연구와 비교하여 총 3개의 유닛으로 구분하였다. 최후빙기극대기에 퇴적된 유닛 3 퇴적물은 동시베리아해로 유입되는 콜리마 강과 인디기르카 강 퇴적물들이 동시베리아해 대륙붕에 퇴적된 후, 해빙이나 해류에 의해 유입된 것으로 보인다. 퇴빙기에 해당하는 유닛 2 퇴적물은 동시베리아해로 유입되는 콜리마 강, 인디기르카 강, 보퍼트해로 유입되는 맥켄지강과 캐나다 군도로부터 함께 공급된 것으로 보이며, 로렌타이드 빙상의 융해에 의하여 다량의 빙운쇄설물들이 유입되었다. 간빙기 퇴적물인 유닛 1의 경우, 세립질 퇴적물들은 캐나다 북부와 동시베리아해로부터 해빙과 해류에 의해 공급되었으며, 조립질 퇴적물들은 캐나다 군도로부터 해빙에 의해 유입된 것으로 여겨진다.

Abstract ▼ AI-Helper

In the Arctic Ocean, the distribution of sea ice and ice sheets changes as climate changes. Because the distribution of ice cover influences the mineral composition of marine sediments, studying marine sediments transported by sea ice or iceberg is very important to understand the global climate change. This study analyzes marine sediment samples collected from the Arctic Ocean and infers the provenance of the sediments to reconstruct the paleoenvironment changes of the western Arctic. The analyzed samples include four gravity cores collected from the Araon mound in the Chukchi Plateau and one gravity core collected from the slope between the Araon mounds. The core sediments were brown, gray, and greenish gray, each of which corresponds to the characteristic color of sediments deposited during the interglacial/glacial cycle in the western Arctic Ocean. We divide the core sediments into three units based on the analysis of bulk mineral composition, clay mineral composition, and Ice Rafted Debris (IRD) as well as comparison with previous study results. Unit 3 sediments, deposited during the last glacial maximum, were transported by sea ice and currents after the sediments of the Kolyma and Indigirka Rivers were deposited on the continental shelf of the East Siberian Sea. Unit 2 sediments, deposited during the deglacial period, were from the Kolyma and Indigirka Rivers flowing into the East Siberian Sea as well as from the Mackenzie River and the Canadian Archipelago flowing into the Beaufort Sea. Unit 2 sediments also contained an extensive amount of IRD, which originated from the melted Laurentide Ice Sheet. During the interglacial stage, fine-grained sediments of Unit 1 were transported by sea ice and currents from Northern Canada and the East Siberian Sea, but coarse-grained sediments were derived by sea ice from the Canadian Archipelago.

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표/그림 (7)

그림 Fig. 1. (a) Map showing the locations of Araon mound. The thick arrow represents Beaufort Gyre (BG) and TransPolar Drift (TPD), and the narrow arrow represents coastal currents. (b) Sub-Bot-tom Profiler (SBP) image showing the locations of sediment core of Araon mound.
표 Table 1. Average content of bulk mineral composition by unit
표 Table 2. Average content of relative clay mineral composition by unit (%)
그림 Fig. 2. Correlation of the studied core with PC04/PL04 (Park et al., 2017). (Dark gray color; brown units, Light gray color; gray units, Striped; Laminated layer with abundant IRD)
그림 Fig. 3. Downcore profiles of the IRD contents (%), Kaolinite/Illite ratio, Quartz/Feldspar ratio, Dolomite contents (%), and Gypsum contents (%) for ARA09C ST13 and ARA07C ST13 cores.
그림 Fig. 4. Binary plot of (Kln / Chi) * 100 and Illite (%), and Qz / Fd ratio and Dolomite (%) by unit.: Values of potential provenance sediments comprising the bulk minerals and clay minerals are plotted for compari-son( Silverberg et al., 1972; Naidu et al., 1982; Naidu and Mowatt, 1983; Wahsner, 1999; Darby et al., 2011). (Kln; Kaolinite, C hl; Chlorite, Q z; Q uartz, F d; F eldspar, K R; K oly ma R iver, I R; I ndigirka River, M R; Mackenzie River, CA; Canad Archipelago)
그림 Fig. 5. Schematic reconstruction of environments in the Chukchi Sea and factors controlling sedimenta-tion at the Araon mound (white circle). (a) gla-cial inputs; (b) deglacial inputs; (c) interglacial inputs. (Black arrow; sea ice and current input, White arrow; iceberg input, Gray arrow; sea ice input)

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