Basement Reactivation and Control of Neogene Structures in the Outer Browse Basin, North West Shelf
Basement Reactivation and Control of Neogene Structures in the Outer Browse Basin, North West Shelf
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西北陆架外布劳斯盆地新近纪构造的基底活化与控制
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
S. Moss
中科院分区：
文献类型：
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作者：
Keep Keep;S. Moss
基底控制沿着西北大陆架的再活化已被广泛假定，但与新近纪事件的直接联系尚未得到证实。其中一个原因是，西北大陆架附近的新近纪变形样式各不相同，并且已被发现在地理上严格限制在某些地区，如巴尔科次盆地。在Browse盆地的巴尔科次盆地，晚二叠世至早三叠世伸展期间形成的构造强烈影响了随后的新近纪变形模式。最近对巴尔科次盆地新生代和中生界地层的构造和地层分析表明，深部构造对中新世剖面内构造的位置和性质有很大影响。特别是自早三叠世以来，NE-SW向伸展断层多次重新活动，随后形成了反转构造，如三叠纪半地堑生长序列中发育的开放褶皱。这些早三叠世伸展断层在白垩纪和新生代继续活化。轻微的断层运动记录在Cenomanian-Turonian，而更明显的断层发生在渐新世中期和中新世中期至晚期。后者与NE-SW断层的纯走滑和压扭再活化以及广泛反转构造（如巴尔科和Lombardina-Lynher构造）的形成有关。这些断层上的持续运动的其他影响可以从白垩纪剖面的披覆背斜的位置和中新世剖面的浅海生物礁的优先位置看出，这些生物礁直接位于三叠纪地垒和下盘块体顶部的边缘。
Basement control on reactivation along the North West Shelf has been broadly postulated, but direct links with Neogene events have yet to be substantiated. One reason for this is that styles of Neogene deformation vary around the North West Shelf, and have been found to be tightly geographically constrained to certain areas, such as the Barcoo Sub-basin. In the Barcoo Sub-basin of the Browse Basin structures initiated during Late Permian to Early Triassic extension have strongly influenced patterns of subsequent Neogene deformation. Recent structural and stratigraphic analyses of Cenozoic and Mesozoic horizons in the Barcoo Sub-basin have revealed the strong influence of deep structures upon the location and nature of structures within the Miocene section. In particular NE-SW extensional faults have been reactivated at several times since the early Triassic, with the subsequent formation of inversion structures such as open folds developed in Triassic half graben growth sequences. Reactivation of these Early Triassic extensional faults continued during the Cretaceous and Cenozoic. Minor fault movement is recorded in the Cenomanian-Turonian, whilst more pronounced faulting occurred in the Middle Oligocene and Middle to Late Miocene. The latter was associated with pure strike-slip and transpressional reactivation of NE-SW faults and formation of extensive inversion structures such as the Barcoo and Lombardina-Lynher structures. Other effects of continued motion on these faults can be seen from the location of drape anticlines in the Cretaceous section and the preferential location of shallow marine reefs in the Miocene section directly over the edge of Triassic horsts and crests of footwall blocks.