极地研究2013，Vol.25Issue(2)：161-166,6.DOI:10.3724/SP.J.1084.2013.00161
西南极南设得兰群岛中新生代地层特征
STRATIGRAPHIC CHARACTERISTICS OF THE MESOZOIC-CENOZOIC IN THE SOUTH SHETLAND ISLANDS, ANTARCTICA
摘要
Abstract
The South Shetland Islands were formed from the subduction of the palaeo-Pacific plate beneath the Antarctic Plate in the late Mesozoic.However,there are no comprehensive records of the stratigraphic characteristics and sedimentary evolution of the entire islands.We examined the distribution of strata by reviewing the literature on the islands published nationally and internationally.The exposed strata in the southwestern South Shetland Islands were mainly from the upper Jurassic-lower Cretaceous.The sedimentary facies included submarine fan,deep sea,marine slope apron,and fan delta.The volcanism was manifested by the eruption of alkaline basalt and basaltic andesite.The evolution from fore-arc basin to volcanic islands has been recorded.The strata in the northeastern South Shetland Islands is mainly upper Cretaceous to Neogene.The sedimentary environment of the upper CretaceousEocene is continental basin in warm climate.The lithology is mainly consisted of basaltic lava,pyroclastic debris and sedimentary rock.Geochemically,the volcanics were transitional from alkaline basalt to tholeiite.The Oligocene-Miocene yielded the transformation from normal marine facies in the interglacial stage to glacio-marine facies in the glacial stage.关键词
地层特征/岩浆活动/中新生代/南设得兰群岛Key words
South Shetland/ Mesozoic-Cenozoic/ stratigraphic characteristics/ magmatic activity引用本文复制引用
王改云,邓希光,刘金萍,杜民..西南极南设得兰群岛中新生代地层特征[J].极地研究,2013,25(2):161-166,6.基金项目
国土资源部重大专项(GT-YQ-QQ-2011-8-25)资助 （GT-YQ-QQ-2011-8-25）
