Tectonic modification of the Australian North‐West Shelf: episodic rejuvenation of long‐lived basin divisions
Tectonic modification of the Australian North‐West Shelf: episodic rejuvenation of long‐lived basin divisions
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澳大利亚西北陆架的构造改造：长期盆地划分的间歇性复兴
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Keep
中科院分区：
文献类型：
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作者：
M. Harrowfield;M. Keep
新近纪澳大利亚和班达弧之间的碰撞改变了澳大利亚西北陆架内两个相邻的沉积中心，Browse盆地和Bonaparte盆地。我们确定了这一变化的两个组成部分：(1)二叠系—石炭系基底地形的连续长波放大，(2)三叠系—新近沉积盖层的弯曲和正断裂。尽管这种变形在Browse盆地和Bonaparte盆地中是连续的，但两个盆地的基底构造控制程度、断裂联动机制和同构造可容纳空间分布存在显著差异。这些变化反映了断裂障碍式容纳带（Browse/Bonaparte过渡带）两侧裂陷基底的构造起伏、幅度和深度的根本差异。这种长期存在的建筑差异，没有离散的结构表达，被新近纪的碰撞放大了。我们研究了Browse/Bonaparte过渡期的构造复兴，并描述了积极维持长期大陆架分割的机制。
Neogene collision between Australia and the Banda Arc modified two adjacent depocentres within Australia's North‐West Shelf, the Browse and Bonaparte Basins. We identify two components of this modification: (1) continuous long‐wavelength amplification of Permo‐Carboniferous basement topography, and (2) flexure and normal faulting of Triassic–Recent sedimentary cover. Although this deformation was continuous across the Browse and Bonaparte Basins, the degree of basement architectural control, mechanisms of fault linkage and distribution of syntectonic accommodation space varied significantly between the two basins. These variations reflect fundamental differences in the structural relief, amplitude and depth of rifted basement on either side of a rupture‐barrier‐style accommodation zone, the Browse/Bonaparte Transition. This long‐lived architectural divide, of which there is no discrete structural expression, was amplified by Neogene collision. We examine tectonic rejuvenation of the Browse/Bonaparte Transition and describe a mechanism for actively sustaining long‐lived segmentation of the continental shelf.