Abstract The Mount Woods Domain in the Gawler Craton, South Australia records a complex tectonic evolution spanning the Palaeoproterozoic and Mesoproterozoic. The regional structural architecture is interpreted to represent a partially preserved metamorphic core complex that developed during the ~1600–1580 Ma Hiltaba Event, making this one of the oldest known core complexes on Earth. The lower plate is preserved in the central Mount Woods Domain, which comprises the Mount Woods Metamorphics. These rocks yield a detrital zircon maximum depositional age of ~1860 Ma and were polydeformed and metamorphosed to upper amphibolite to granulite facies during the ~1740–1690 Ma Kimban Orogeny. The upper plate comprises a younger succession (the Skylark Metasediments) deposited at ~1750 Ma. Within the upper plate, sedimentary and volcanic successions of the Gawler Range Volcanics were deposited into half graben that evolved during brittle normal faulting. The Skylark Shear Zone represents the basal detachment fault separating the upper and lower plate of the core complex. The geometry of normal faults in the upper plate is consistent with NE-SW extension. Both the upper and lower plates are intruded by ~1795–1575 Ma Hiltaba Suite granitic and mafic plutons. The core complex was extensively modified during the ~1570–1540 Ma Kararan Orogeny. Exhumation of the western and eastern Mount Woods Domain is indicated by new 40Ar/39Ar biotite cooling ages that show that rock packages in the central Mount Woods Domain cooled past ~300 °C ± 50 °C at ~1560 Ma, which was ~20 million years before equivalent cooling in the western and eastern Mount Woods Domain. Exhumation was associated with activity along major syn-Kararan Orogeny faults.

中文翻译：

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约的解释。澳大利亚高勒克拉通北部 1600-1580 Ma 变质核杂岩

摘要 南澳大利亚高勒克拉通的伍兹山域记录了跨越古元古代和中元古代的复杂构造演化。区域结构结构被解释为代表在 ~1600–1580 Ma Hiltaba 事件期间发展起来的部分保存的变质核心复合体，使其成为地球上已知最古老的核心复合体之一。下板块保存在伍兹山域的中央，其中包括伍兹山变质岩。这些岩石产生的碎屑锆石最大沉积年龄为~1860 Ma，在~1740-1690 Ma Kimban 造山运动期间多变形并变质为上部角闪岩到麻粒岩相。上板块包括沉积在~1750 Ma 的较年轻的系列（云雀变质沉积物）。在上盘内，高勒山脉火山的沉积和火山序列沉积在半地堑中，该地堑是在脆性正断层作用过程中形成的。云雀剪切带代表了分离核心复合体上下板块的基底拆离断层。上板块正断层的几何形状与 NE-SW 伸展一致。上下板块均被~1795-1575 Ma Hiltaba Suite 花岗岩和镁铁质岩体侵入。在~1570-1540 Ma Kararan 造山运动期间，核心复合体得到了广泛的改造。新的 40Ar/39Ar 黑云母冷却年龄表明西部和东部 Mount Woods 域的开采表明，Mount Woods 域中部的岩石包在~1560 Ma 时冷却超过~300 °C ± 50 °C，即~2000 万数年前，西部和东部 Mount Woods Domain 的同等降温。