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Basin evolution and destruction in an Early Proterozoic continental margin : the Rinkian fold–thrust belt of central West Greenland.

机译:原始元古代大陆边缘的盆地演化和破坏:西格陵兰中部的林肯褶皱冲断带。

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摘要

In central West Greenland, early Palaeoproterozoic siliciclastic and carbonate sequences of the Karrat Group (shelf sequences of the Rae craton margin) were deposited in sedimentary basins controlled by NW- and SW-trending linked extensional fault systems. The shelf basins were later filled and overtopped by turbidite systems filling a foredeep advancing ahead of a thrust system – the Karrat Fjord thrust system – that propagated west to east. Deformation culminated in emplacement of basement-cored nappes, progressive deformation and high-grade metamorphism at c. 1.87 Ga. Reactivation of lower plate growth faults formed dome- and basin-like folds and related thrusts that refolded the structure of the Karrat Fjord thrust system and inverted the shelf basins. The southern Karrat Fjord thrust system was reworked in a belt of intense ductile NW-directed thrusting – the Nunaarsussuaq thrust system – formed at c. 1.84 Ga at the northern limit of the Nagssugtoqidian orogen. Kinematics of these events are at odds with the consensus view that the Rinkian fold–thrust belt is a northward extension of the Nagssugtoqidian orogen resulting from north–south convergence between the Rae and North Atlantic cratons. Application of structural restoration techniques to basin analysis of Palaeoproterozoic rocks has potential to provide new insights into Proterozoic orogenic processes worldwide.
机译:在西格陵兰中部,Karrat群的早古元古代硅质碎屑岩和碳酸盐岩层序(Rae克拉通边缘的陆架层序)沉积在受西北向和西南向联系的伸展断裂系统控制的沉积盆地中。陆架盆地后来被浑浊的系统充满,并被顶部的浊积系统所覆盖,该系统在推力系统(Karrat Fjord推力系统)之前向西传播,并向西传播。变形最终导致在c处基层带芯的尿布的位置,渐进形变和高级变质作用。 1.87 Ga。下部板块发育断层的复活形成了圆顶状和盆地状的褶皱以及相关的逆冲作用,从而使Karrat Fjord逆冲系统的结构发生了褶皱,并使陆架盆地反转。南部的Karrat Fjord逆冲系统在c处形成的强烈延性的NW定向逆冲带(Nunaarsussuaq逆冲系统)中进行了改造。 Nassugtoqidian造山带北限为1.84 Ga。这些事件的运动学与共识观点不一致,后者认为Rinkian褶皱冲断带是Nassugtoqidian造山带的北向延伸,这是Rae和北大西洋克拉通之间的南北汇合所致。结构修复技术在古元古代岩石盆地分析中的应用可能为世界范围内的元古代造山过程提供新的见解。

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    Grocott John; McCaffrey Ken;

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