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Thermotectonic evolution of the Rauer Group and Vestfold Hills in Prydz Bay: Implications for Neoproterozoic assembly of the East Antarctic shield
Polar Science ( IF 1.8 ) Pub Date : 2023-11-15 , DOI: 10.1016/j.polar.2023.101015
Sandro Chatterjee , Aishi Debnath , Suvankar Samantaray , Devsamridhi Arora , Soham Dey , Saibal Gupta , Naresh Chandra Pant

The Rauer Group and Vestfold Hills are critical components of the East Antarctic Shield and are believed to have been parts of the supercontinents Rodinia and Gondwana. The Rauer Group is characterized by Archean to Pan-African thermal history, while the Pan-African signature in the Vestfold Hills is restricted to its southwestern margin. The correlation between the Rauer Group and Vestfold Hills remains controversial, while the significance of amalgamation between these two terranes remains unclear. Most importantly, the precise nature and timing of the Rauer-Vestfold contact is disputed. In this review, we compare the available structural, metamorphic, geochronological and geophysical data in these two East Antarctic terranes and suggest that (i) the Rauer Group and Vestfold Hills of East Antarctica were amalgamated during the late Mesoproterozoic to early Neoproterozoic (∼1000 Ma), and (ii) the Rauer-Vestfold contact is located beneath the Sørsdal Glacier in the East Antarctic Shield. Finally, we argue that juxtaposition of the Rauer-Vestfold contiguous crustal unit with the Eastern Ghats Province (EGP)-Rayner amalgam took place in the Pan-African time (∼500 Ma).



中文翻译:

普里兹湾劳尔群和西福尔德山的热构造演化:对东南极地盾新元古代组装的影响

劳尔群和西福尔山是东南极地盾的重要组成部分,据信是超级大陆罗迪尼亚和冈瓦纳的一部分。劳尔群的特征是太古宙到泛非热历史,而西福尔德山的泛非特征仅限于其西南边缘。劳尔群和西福尔德山之间的相关性仍然存在争议,而这两个地体之间合并的意义仍不清楚。最重要的是,劳尔-西福尔德接触的确切性质和时间存在争议。在这篇综述中,我们比较了这两个东南极地体的现有结构、变质、年代学和地球物理数据,并提出:(i) 东南极洲的劳尔群和西福尔德山在中元古代晚期到新元古代早期(∼1000 Ma)合并),以及 (ii) Rauer-Vestfold 接触面位于东南极地盾的 Sørsdal 冰川下方。最后,我们认为 Rauer-Vestfold 连续地壳单元与东高止山脉省 (EGP)-Rayner 混合物的并置发生在泛非时代(∼500 Ma)。

更新日期:2023-11-16
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