Abstract

This study focuses on physical modeling of interaction between the Indian and Pacific spreading axes, which resulted in separation of the Tasmania and Adélie blocks during the final stage of the Gondwana breakup, with separation of Australia and Antarctica. The Indian branch of seafloor spreading propagated eastward across the Archean–Mesoproterozoic lithosphere of the western part of Australia–Antarctica, whereas the Pacific branch moved westward through the Paleozoic–Early Mesozoic Fold Belt of eastern Australia–Antarctica. The experiments demonstrated that the interaction between the two spreading axes led to oblique extension (at an angle of 120°–130°) between two continents. At the same time, a rift branch formed between Antarctica and the Adélie Block, but did not developed further. Subsequent opening of the ocean occurred with sinistral strike-slip, which led to transpressional deformations of the Adélie Block and Sorell Basin within the Tasmania Block.

中文翻译：

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塔斯马尼亚岛和阿德利大陆块形成条件在澳大利亚-南极古大陆解体初期的条件的实验模拟

摘要

这项研究的重点是印度和太平洋扩散轴之间相互作用的物理模型，这导致了冈瓦纳解体的最后阶段塔斯马尼亚和阿德利地块分离，澳大利亚和南极洲也分离了。印度海底扩散分支向东传播，穿过澳大利亚-南极洲西部的太古代-中元古代岩石圈，而太平洋分支则向西穿过澳大利亚-南极东部的古生代-早中生褶皱带。实验表明，两个传播轴之间的相互作用导致两大洲之间的倾斜延伸（120°–130°角）。同时，在南极洲和阿德利街区之间形成了裂谷分支，但没有进一步发展。