The Australo-Antarctic Columbia to Gondwana transition
The Australo-Antarctic Columbia to Gondwana transition
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DOI：
10.1016/j.gr.2014.10.019
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发表时间：
2016-01-01
影响因子：
6.1
通讯作者：
Siegert, M. J.
中科院分区：
文献类型：
--
作者：
Aitken, A. R. A.;Betts, P. G.;Siegert, M. J.
从中元古界到寒武纪，澳南极洲的构造特征是作为超级大陆哥伦比亚、Rodinia和Gondwana的一部分而重新构造。南极洲威尔克斯地区的新构造知识允许通过重建到ca. 160 Ma Gondwana.我们还解决了330 +/- 30公里的左旋走滑偏移>3000公里长的蒙德拉比拉-弗罗斯特剪切带和260 +/- 20公里的右旋偏移>1000公里长的极光断层重建ca。1150 Ma南极洲-澳大利亚的几何学。使用此修改后的几何形状，我们推导出第一个模型的哥伦比亚冈瓦纳大陆的重新配置过程，是几何约束到类似于100公里的规模。在这个模型中，中元古代早期的构造是由两个相对的俯冲系统驱动的。在南-南极东缘存在一个以西倾为主的俯冲带。1.55-1.50 Ga。一个主要向东倾斜的俯冲带从约1000年开始在莫森盆地西缘活动。1.70我来了。1.42佐治亚州后者导致莫森海盆相对于西澳大利亚海盆和北澳大利亚海盆逐渐向西运动和顺时针旋转，并导致一系列大陆带的增生，这些大陆带现在保存在马斯格雷夫省及其南部延伸部分。中元古界中期，在西澳大利亚岩带下方，主要向西倾斜俯冲，导致莫森岩带与北澳大利亚岩带和西澳大利亚岩带沿着罗多纳-托滕剪切带最终闭合。在1.31 Ga之前实现了收敛，但最终的碰撞可能直到大约1.31 Ga才发生。1.29佐治亚州1.29 Ga后的板内活动涉及1.22至1.12 Ga的长期高温造山作用，以及1.13至1.09 Ga之间的Mundrabilla-Frost剪切带的显著运动，这可能是对Rodinia在约1.09 Ga组装的响应。1.1佐治亚州南-澳板块沿着印度-南-澳缝合带（IAAS）和昆加造山运动，可能在新元古代晚期至寒武纪早期与印度-南极板块合并。(C)2014年国际冈瓦纳研究协会。Elsevier B. V.出版，保留所有权利。
From the Mesoproterozoic to Cambrian, Australo-Antarctica was characterised by tectonic reconfiguration as part of the supercontinents Columbia, Rodinia and Gondwana. New tectonic knowledge of the Wilkes Land region of Antarctica allows Australo-Antarctic tectonic linkages to be resolved through reconstruction into ca. 160 Ma Gondwana. We also resolve 330 +/- 30 km of sinistral strike-slip offset on the >3000 km long Mundrabilla-Frost Shear Zone and 260 +/- 20 km of dextral offset on the >1000 km long Aurora Fault to reconstruct the ca. 1150 Ma geometry of Australo-Antarctica. Using this revised geometry, we derive the first model of the Columbia to Gondwana reconfiguration process that is geometrically constrained to similar to 100 km scale. In this model, early Mesoproterozoic tectonics is driven by two opposing subduction systems. A dominantly west-dipping subduction zone existed at the eastern margin of Australo-Antarctica until ca. 1.55-1.50 Ga. A predominantly east-dipping subduction zone operated at the western margin of the Mawson Craton from ca. 1.70 Ga to ca. 1.42 Ga. The latter caused gradual westwards motion and clockwise rotation of the Mawson Craton relative to the West and North Australian Craton and the accretion of a series of continental ribbons now preserved in the Musgrave Province and its southern extensions. A mid-Mesoproterozoic switch to predominantly west-dipping subduction beneath the West Australian Craton brought about the final closure of the Mawson Craton with the North and West Australian Craton along the Rodona-Totten Shear Zone. Convergence was achieved prior to 1.31 Ga, but final collision may not have occurred until ca. 1.29 Ga. Post-1.29 Ga intraplate activity involved prolonged high-temperature orogenesis from 1.22 to 1.12 Ga, and significant movement on the Mundrabilla-Frost Shear Zone between 1.13 and 1.09 Ga, perhaps in response to the assembly of Rodinia at ca. 1.1 Ga. The Australo-Antarctic Craton was amalgamated with Indo-Antarctica along the Indo-Australo-Antarctic Suture (IAAS) and Kuunga Orogeny, probably in the latest Neoproterozoic to early Cambrian. (C) 2014 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.