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대한지리학회지 = Journal of the Korean Geographical Society v.41 no.5 = no.116, 2006년, pp.513 - 526  
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서남극 남쉐틀랜드 군도의 제4기 후기 빙하 활동의 지형학적 고찰
A Preliminary Geomorphic Overview of Late Quaternary Glacier Fluctuations in the South Shetland Islands, West Antarctica

임현수   윤호일    (   ); 이용일    (   ); 김예동    (   ); Owen Lewis A.    (   ); 성영배    (미국 신시내티 대학교 지질학과  );
  • 초록

    2005~2006남반구 여름기간 동안 서남극 남쉐틀랜드 군도의 빙하지형 및 그에 관련된 제 4기 후기 기후변화에 대하여 조사했다. 빙하지형학적 증거와 방사성탄소 연대측정 결과는 이 지역에서 세 번 이상의 빙하 전전이 있었음을 보여준다. 첫번째는 광범위한 빙하활동으로서 최종빙기 최성기(LGM)에 형성된 것으로 보이며 해저지형과 빙하기저 융빙수 하천, 그리고 찰흔의 기록에 의하면 빙상의 중심이 지금의 북쪽 대륙붕에 있었고 약 1000m의 두께와 바닥면의 온도가 어는점 이상이었던 것으로 추측된다. 이와는 달리 홀로세 후기에도 최소 두 번 이상의 빙하 전진이 있었는데 이들은 현재의 해안선을 넘지 못하는 매우 제한된 범위였고 빙하의 기저면이 어는점 이하에 있어서 침식활동이 미약했던 것으로 판단된다. 이들 제한된 빙하활동은 약 2천년전 그리고 소빙기에 각각 발생하였다.


    The timing and extent of glaciations during the Late Quaternary in the South Shetland Islands, West Antarctica were defined using field mapping, geomorphic analysis and radiocarbon dating. Landforms of glacial erosion and deposition, in particular subglacial meltwater channel erosion, suggest that at least three glaciations occurred during the late Quaternary within the study region. During the global LGM, glacial troughs (such as Maxwell Bay and Admiralty Bay) were overdeepened by an ice stream moving south from $an\sim1000m-thick$ ice cap centered on the present-day continental shelf to the north. This ice was responsible for the subglacial meltwater channel erosion, and glacial polished and striated bedrock on the Fildes Peninsula. The recent local glaciations occurred about 2,000 years ago and during Little Ice Age (LIA). During these glaciations, glaciers were less extensive than the previous one and less erosive as a cold-based ice


  • 주제어

    서남극 남쉐틀랜드 군도 .   제 4기 후기 .   빙하기저 융빙수 하천 .   빙퇴석 .   찰흔 .   빙하평형 고도.  

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