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Marine geological investigation of Edward VIII Gulf, Kemp Coast, East Antarctica
Antarctic Science ( IF 1.8 ) Pub Date : 2020-03-04 , DOI: 10.1017/s0954102020000097
Isabel A. Dove , Amy Leventer , Meredith J. Metcalf , Stefanie A. Brachfeld , Robert B. Dunbar , Patricia Manley , Amelia E. Shevenell , Richard W. Murray , Matthew Hommeyer , Kelly A. Kryc , Natalie McLenaghan , Fiona Taylor , Bruce A. Huber

A physical oceanographic, geophysical and marine geological survey of Edward VIII Gulf, Kemp Coast, collected data from conductivity–temperature–depth casts, multi-beam bathymetric swath mapping and 3.5 kHz sub-bottom surveying. Modified circumpolar deep water (mCDW) is observed in Edward VIII Gulf, as well as notable bathymetric features including mega-scale glacial lineations and a 1750 m-deep trough. Sedimentological, geochemical, rock-magnetic and micropalaeontological analysis of two kasten cores document regional palaeoclimate and palaeo-oceanographic conditions over the past 8000 years, with a warm period occurring from c. 8 to 4 ka and a shift to cooler conditions beginning at c. 4 ka and persisting until at least 0.9 ka. Sediment packages > 40 m thick within deep troughs in Edward VIII Gulf present potential targets for higher-resolution Holocene and deglacial climate studies. Despite the presence of mCDW on the shelf, inland bed topography consisting of highland terrain suggests the likelihood of relative stability of this sector of the East Antarctic Ice Sheet.

中文翻译:

东南极洲肯普海岸爱德华八世湾海洋地质调查

肯普海岸爱德华八世湾的物理海洋学、地球物理和海洋地质调查收集了来自电导率-温度-深度模型、多波束测深条带测绘和 3.5 kHz 海底测量的数据。在爱德华八世湾观察到改良的极地深水 (mCDW),以及显着的测深特征,包括大型冰川线和 1750 米深的海槽。对两个 kasten 岩心的沉积学、地球化学、岩磁和微古生物学分析记录了过去 8000 年的区域古气候和古海洋条件,暖期从C。8 到 4 ka,并从C。4 ka 并持续到至少 0.9 ka。爱德华八世湾深槽内厚度 > 40 m 的沉积物包为更高分辨率的全新世和冰川气候研究提供了潜在目标。尽管大陆架上存在 mCDW,但由高地地形组成的内陆河床地形表明东南极冰盖这一区域相对稳定的可能性。
更新日期:2020-03-04
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