STRATIGRAPHIC CHARACTERISTICS OF THE MESOZOIC-CENOZOIC IN THE SOUTH SHETLAND ISLANDS, ANTARCTICA

doi:10.3724/SP.J.1084.2013.00161

Abstract

Abstract: South Shetland Islands is a magmatic arc formed in the subduction of the palaeo-Pacific plate beneath Antarctic Plate since late Mesozoic. Due to the subduction, the distribution of strata is rather regular in time and space. The exposing strata in southwestern South Shetland Islands is mainly the upper Jurassic- lower Cretaceous, The types of sedimentary facies are submarine fan, deep sea, marine slope apron, fan delta, and so on. The volcanism is manifested by eruption of alkaline basalt and basaltic andesite. It has recorded the evolution from fore-arc basin to volcanic islands. While the strata in northeastern South Shetland Islands is mainly upper Cretaceous to Neogene. The sedimentary environment of the upper Cretaceous-Eocene is continental basin in warm climate, which consist mainly of basaltic lava, pyroclastic debris and sedimentary rock. The volcanics are transitional from alkaline basalt to tholeiite in geochemistry. The Oligocene- Miocene has recorded the transformation from normal marine facies in interglacial stage to glacio-marine facies in glacial stage.

Key words: South Shetland, Mesozoic-Cenozoic, stratigraphic characteristics, magmatic activity

Wang Gaiyun，Deng Xiguang，Liu Jinping，Du Min. STRATIGRAPHIC CHARACTERISTICS OF THE MESOZOIC-CENOZOIC IN THE SOUTH SHETLAND ISLANDS, ANTARCTICA[J]. ADVANCES IN POLAR SCIENCE, 2013, 25(2): 161-166.

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STRATIGRAPHIC CHARACTERISTICS OF THE MESOZOIC-CENOZOIC IN THE SOUTH SHETLAND ISLANDS, ANTARCTICA

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