The central Australian Musgrave Province at the junction of the South, North and West Australian cratons has undergone and continues to retain evidence of significant whole-of-crust, and most likely ‘whole-of-lithosphere’ tectono-magmatic processes. The area is known for some of the largest geophysical anomalies related to significant Moho offsets of up to 15 km, which resulted from repeated intracratonic reworking since the Neoproterozoic. New magnetotelluric (MT) data have been collected across the Musgrave Province in Western Australia and South Australia as part of the Australian Lithospheric Architecture Magnetotelluric Project (AusLAMP). Station spacing was $$\sim 50\,\hbox {km}$$ ∼ 50 km between 96 sites over an area of 500 × 700 km. Long-period MT impedance and tipper data over a bandwidth of 8 s to 10,000 s period have been inverted using a smooth 3D inverse algorithm. The 3D model shows two predominant resistivity trends. There are deep ( $$>65\,\hbox {km}$$ > 65 km ) north–south mantle conductors that we infer to be related to the Palaeo- to Mesoproterozoic north-trending arc-related rocks that experienced ultra-high temperature metamorphism and widespread magmatism during the Mesoproterozoic Musgravian Orogeny. These conductors are preserved in the crust south of the Musgrave Province. The upper mantle also contains a localised resistive zone that possibly represents generation of mafic- to ultramafic magmas during the c. 1090–1040 Ma Giles Event. The crust ( $$<65\,\hbox {km}$$ < 65 km depth) contains strong east–west crustal conductors interpreted to reflect the east–west structural grain that initiated during the c. 1090–1040 Ma Giles Event and overprinted the older N–S-oriented mantle anomalies. These E–W crustal conductors coincide with magnetic anomalies that represent crustal-scale structures, and high gravity anomalies associated with significant Moho offsets resulting from further reactivation during the c. 630–520 Ma Petermann and c. 450–300 Ma Alice Springs orogenies.

中文翻译：

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澳大利亚中部马斯格雷夫省大陆内变形带的 AusLAMP 3D MT 成像

位于南、北和西澳大利亚克拉通交界处的澳大利亚中部马斯格雷夫省经历并继续保留着重要的整体地壳和最有可能的“整体岩石圈”构造岩浆过程的证据。该地区以一些最大的地球物理异常而闻名，这些异常与长达 15 公里的重大莫霍面偏移有关，这是自新元古代以来克拉通内重复改造的结果。作为澳大利亚岩石圈建筑大地电磁项目 (AusLAMP) 的一部分，在西澳大利亚州和南澳大利亚州的马斯格雷夫省收集了新的大地电磁 (MT) 数据。站点间距为 $$\sim 50\,\hbox {km}$$ ~ 50 km，在 500 × 700 km 区域内的 96 个站点之间。8 s 至 10 带宽内的长周期 MT 阻抗和倾卸车数据，000 s 周期已使用平滑的 3D 逆算法反转。3D 模型显示了两个主要的电阻率趋势。有深部（ $$>65\,\hbox {km}$$ > 65 km ）南北地幔导体，我们推断这些导体与古至中元古代北向弧相关的岩石有关，这些岩石经历了超高中元古代Musgravian造山运动期间的温度变质作用和广泛的岩浆作用。这些导体保存在马斯格雷夫省南部的地壳中。上地幔还包含一个局部的电阻带，它可能代表了 c 期间基性至超基性岩浆的产生。1090–1040 Ma Giles 事件。地壳（$$<65\,\hbox {km}$$ < 65 km 深度）包含强大的东西向地壳导体，被解释为反映了在 c. 期间开始的东西向结构颗粒。1090-1040 Ma Giles 事件并叠印了旧的 N-S 方向的地幔异常。这些 E-W 地壳导体与代表地壳尺度结构的磁异常以及与 c 期间进一步重新激活导致的显着莫霍面偏移相关的高重力异常相吻合。630-520 马彼得曼和 c。450–300 Ma 爱丽斯泉造山运动。