The Tectonomagmatic Setting of Early to Middle Jurassic Bimodal Volcanism in the Transantarctic Mountains

横贯南极洲的比尔德摩尔冰川地区 山脉有最完整的冈瓦纳层序（维多利亚 Beacon Supergroup（英语：Beacon Supergroup）位于南极洲。 这 序列被拉斑玄武岩覆盖， 与冈瓦纳大陆裂解有关的费拉群。 火山作用和溢流玄武岩喷发反映了 燕山期构造环境变化 山，从一个前陆盆地与一个活跃的 与冈瓦纳大陆有关的大陆裂谷的板块边缘 分手 该项目的目标是： 1)建立详细的地层框架， 火山岩，以评估的重要性， 单元和同沉积的区域减薄 张性正断层作用; 2）研究 这一序列的古火山学，特别是 它由蒸汽岩浆作用形成，为了 了解岩石形成的自然环境 其形成与推断的构造环境的关系; 3)进一步描述地球化学特征 火山岩，以便更好地定义时间依赖性 岩浆成分的变化及其可能的关系 玄武岩和玄武岩之间的关系; 4）尝试 对汞的可能来源区域的初步评估 岩浆。

The Beardmore Glacier region of the Transantarctic Mountains has the most complete Gondwana sequence (Victoria Group of the Beacon Supergroup) in Antarctica. This sequence is overlain by tholeiitic flood basalts of the Ferrar Group which are related to Gondwana fragmentation. The volcanism and flood basalt eruption reflect a major change in tectonic environment in the Transantarctic Mountains, from a foreland basin associated with an active plate margin to a continental rift related to Gondwana breakup. The objectives of this project are to: 1) establish a detailed stratigraphic framework for the volcanogenic rocks in order to assess the importance of regional thinning of units and of syndepositional extensional normal faulting; 2) investigate the paleovolcanology of this sequence, in particular that part of it formed by phreatomagmatic processes, in order to understand the physical environment in which the rocks were formed and the relations to the inferred tectonic setting; 3) further characterize the geochemistry of the volcanogenic rocks in order to better define time dependent changes in magma compositions and possible relations between the silicic and basaltic rocks; 4) attempt a preliminary assessment of possible source regions for the silicic magmas.