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Integrating 40Ar–39Ar, 87Rb–87Sr and 147Sm–143Nd geochronology of authigenic illite to evaluate tectonic reactivation in an intraplate setting, central Australia

机译:整合自生伊利石的40Ar–39Ar,87Rb–87Sr和147Sm–143Nd地质年代学,以评估澳大利亚中部板块内构造的活化

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摘要

The Warburton-Cooper basins, central Australia, include a multitude of reactivated fracture-fault networks related to a complex, and poorly understood, tectonic evolution. We investigated authigenic illites from a granitic intrusion and sedimentary rocks associated with prominent structural features (Gidgealpa-Merrimelia-Innamincka Ridge and the Nappamerri Trough). These were analysed by 40Ar-39Ar, 87Rb-87Sr and 147Sm-143Nd geochronology to explore the thermal and tectonic histories of central Australian basins. The combined age data provide evidence for three major periods of fault reactivation throughout the Phanerozoic. While Carboniferous (323.3±9.4Ma) and Late Triassic ages (201.7±9.3Ma) derive from basin-wide hydrothermal circulation, Cretaceous ages (~128 to ~86Ma) reflect episodic fluid flow events restricted to the synclinal Nappamerri Trough. Such events result from regional extensional tectonism derived from the transferral of far-field stresses to mechanically and thermally weakened regions of the Australian continent. Specifically, Cretaceous ages reflect continent-wide transmission of tensional stress from a >2500km long rifting event on the eastern (and southern) Australian margin associated with break-up of Gondwana and opening of the Tasman Sea. By integrating 40Ar-39Ar, 87Rb-87Sr and 147Sm-143Nd dating, this study highlights the use of authigenic illite in temporally constraining the tectonic evolution of intracontinental basins that would otherwise remain unknown. Furthermore, combining Sr- and Ar-isotopic systems enables more accurate dating of authigenesis whilst significantly reducing geochemical pitfalls commonly associated with these radioisotopic dating methods.
机译:澳大利亚中部的沃伯顿-库珀盆地包括许多与复杂的,鲜为人知的构造演化有关的活化断裂-断层网络。我们调查了花岗岩侵入体和与突出的结构特征(吉德阿尔帕-梅里米利亚-因南辛卡海岭和纳帕默里海槽)相关的沉积岩的自生伊利石。通过40Ar-39Ar,87Rb-87Sr和147Sm-143Nd年代学对这些进行了分析,以探索澳大利亚中部盆地的热和构造历史。综合的年龄数据为整个古生代断层重新激活的三个主要时期提供了证据。石炭纪(323.3±9.4Ma)和三叠纪晚期(201.7±9.3Ma)来自整个盆地的热液循环,白垩纪(〜128至〜86Ma)反映了仅限于向斜Nappamerri槽的间歇性流体流动事件。此类事件是由于将远场应力转移到澳大利亚大陆的机械和热弱地区而引起的区域扩张构造的结果。具体而言,白垩纪年龄反映了在澳大利亚东部(和南部)边缘发生> 2500 km长的裂谷事件,与冈瓦纳解体和塔斯曼海开放有关,拉张应力在整个大陆范围内传播。通过整合40Ar-39Ar,87Rb-87Sr和147Sm-143Nd测年,这项研究强调了自生伊利石在时间上限制了大陆内盆地的构造演化,否则这些大陆仍将是未知的。此外,结合使用Sr和Ar同位素系统可以更准确地对自生作用进行定年,同时显着减少通常与这些放射性同位素定年方法相关的地球化学陷阱。

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