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Salt, sediments and weathering environments in Bunger Hills
Antarctic Science ( IF 1.8 ) Pub Date : 2020-02-27 , DOI: 10.1017/s0954102020000073
Damian B. Gore , Michelle R. Leishman

Terrestrial environments at Bunger Hills, East Antarctica, vary from vegetation-rich, little-weathered rock surfaces retaining glacial polish and striations near the glacier and ice-sheet margins to salty, vegetation-poor, extensively weathered regions near to and downwind of marine bays and inlets. Weathering forms include tafoni and orientated pits, which record former wind directions. Although salts are found all over Bunger Hills, the strongly weathered area is coincident with the distribution of halite (NaCl) and thenardite (Na2SO4), both of which are derived from seawater and marine salt spray. Salts elsewhere in Bunger Hills are either subglacial calcium carbonates or rock weathering products including gypsum (CaSO4⋅2H2O) and a range of rarer minerals. These other salt minerals do not weather rocks and sediment. The distribution of halite and thenardite acts as a major control on the geomorphology, sediment geochemistry and biogeography of Bunger Hills.

中文翻译:

邦格山的盐、沉积物和风化环境

南极洲东部邦格山的陆地环境各不相同,从植被丰富、风化程度低的岩石表面保留冰川和冰盖边缘附近的冰川抛光和条纹,到靠近海洋海湾和顺风处的盐碱、植被贫瘠、风化广泛的区域和入口。风化形式包括 tafoni 和定向坑,它们记录了以前的风向。虽然在 Bunger Hills 各处都发现了盐类,但强烈风化的区域与石盐 (NaCl) 和芒硝 (Na2所以4),两者均来自海水和海洋盐雾。邦格山其他地方的盐是冰下碳酸钙或岩石风化产物,包括石膏(CaSO4⋅2H2O) 和一系列稀有矿物。这些其他盐矿物不会风化岩石和沉积物。岩盐和芒硝的分布是对邦格山地貌、沉积物地球化学和生物地理学的主要控制。
更新日期:2020-02-27
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