Distribution of clay minerals and proxies for productivity in surface sediments of the Bellingshausen and Amundsen seas (West Antarctica) -: Relation to modern environmental conditions
Distribution of clay minerals and proxies for productivity in surface sediments of the Bellingshausen and Amundsen seas (West Antarctica) -: Relation to modern environmental conditions
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DOI：
10.1016/s0025-3227(02)00659-x
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发表时间：
2003-02-15
期刊：
影响因子：
2.9
通讯作者：
Fütterer, DK
中科院分区：
文献类型：
--
作者：
Hillenbrand, CD;Grobe, H;Fütterer, DK
研究人员调查了别令斯豪森海和阿蒙森海（南大洋的太平洋部分）南极大陆边缘的表层沉积物，以破译它们记录现代环境条件的能力。陆源砂泥的空间分布反映了冰川碎屑流再沉积的区域差异。陆架沉积物中的粘土矿物组合受邻近腹地源岩的陆源碎屑供给控制，表明阿蒙森海腹地存在未知的沉积岩。别令斯豪森海大陆隆起的粘土矿物分布表明，从南极半岛上升到西经至少94度的海底流是持续存在的。别令斯豪森海西部和阿蒙森海大陆边缘主要为含有孔虫和贫蛋白石矿床，而别令斯豪森海东部主要为含硅藻和无碳酸盐沉积物。根据海洋同位素1期生物钡积累速率和近期生产力测量推断，不同的生物生产模式明显控制了研究区含蛋白石和碳酸盐岩沉积物的空间格局。(C) 2002 Elsevier Science B.V.版权所有
Surface sediments from the Antarctic continental margin in the Bellingshausen and Amundsen seas (Pacific sector of the Southern Ocean) were investigated in order to decipher their capability to record modern environmental conditions. Spatial distribution of terrigenous sand and mud reflect regional differences in current-induced redeposition of glaciogenic debris. Clay mineral assemblages in the shelf sediments are controlled by the supply of terrigenous detritus from source rocks in the adjacent hinterland suggesting the occurrence of yet unknown sedimentary rocks in the hinterland of the Amundsen Sea. Clay mineral distribution on the continental rise in the Bellingshausen Sea points to the continuation of a bottom current from the Antarctic Peninsula rise to at least 94degreesW. Foraminifer-bearing and opal-poor deposits prevail on the continental margin in the western Bellingshausen Sea and the Amundsen Sea, whereas diatom-bearing and carbonate-free sediments characterize the eastern Bellingshausen Sea. Different modes of biological production, which were deduced from accumulation rates of biogenic barium during Marine Isotope Stage 1 and recent productivity measurements, obviously control the spatial pattern of opal- and carbonate-bearing sediments in the study area. (C) 2002 Elsevier Science B.V. All rights reserved.