Abstract The Adelaide Rift Complex is arguably one of the most complete and best studied Neoproterozoic to early Cambrian successions worldwide, preserving evidence of the breakup of Rodinia, two Cryogenian glaciations and the interglacial phase, and one of the best documented Ediacaran to early Cambrian biotic transitions. However, the complex and protracted tectono-sedimentary history of this 0.8–0.5 Ga province is still being debated. We present new and published U Pb ages and Hf and O isotope data for detrital zircons from the Adelaide Rift Complex, representing the most complete assembly of such data for this succession. Deposition during initial mid-Tonia extension was largely sourced locally from rift shoulders. As the basin evolved from rift- to sag-phase following continental breakup in the Cryogenian the provenance regions extended to more distal late Mesoproterozoic terranes to west and northwest. New data from Sturtian Glacial Epoch deposits are consistent with termination of this event at 0.66 Ga, with most deposition during deglaciation. Uplift of the Musgrave region during the Ediacaran to early Cambrian Petermann Orogeny led to dominant sediment supply from that terrane at that time in the north. In the south, earliest Cambrian deposition followed local tectonism, initially revitalising local proximal basement sources. An abrupt change in provenance occurred at the base of the Cambrian Kanmantoo Group, the youngest sediment package in the south. Paleocurrent data indicates transports from the south, probably from formerly contiguous Antarctica, possibly reflecting the onset of convergent tectonics and deposition in a foreland basin, consistent with the near depositional age of the dominant detrital zircon population. Whilst several episodes of significant crustal reworking are identified in the Hf and O isotope data, many of the zircon TDM ages lie within 0.5 Ga of the U Pb ages indicating that new additions from the mantle were common in the provenance regions.

中文翻译：

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新的 U-Pb、Hf 和 O 同位素对阿德莱德裂谷杂岩沉积物来源的限制——记录了新元古代到早期寒武纪演替的关键

摘要 阿德莱德裂谷杂岩可以说是世界范围内最完整、研究最深入的新元古代到早期寒武纪的序列之一，保存了罗迪尼亚分裂、两次低温纪冰川和间冰期的证据，也是埃迪卡拉纪到早寒武纪生物转变的最好记录之一。 . 然而，这个 0.8-0.5 Ga 省复杂而漫长的构造沉积历史仍在争论中。我们提供了来自阿德莱德裂谷杂岩体的碎屑锆石的新的和已发表的 U Pb 年龄以及 Hf 和 O 同位素数据，代表了该序列中此类数据的最完整集合。最初的中托尼亚延伸期间的沉积主要来自裂谷肩部。随着低温纪大陆分裂后盆地从裂谷阶段演变为凹陷阶段，物源区扩展到更远的中元古代晚期地体，向西和西北部。来自 Sturtian Glacial Epoch 沉积物的新数据与该事件在 0.66 Ga 时的终止一致，大部分沉积物发生在冰消期。埃迪卡拉纪至早寒武纪彼得曼造山运动期间 Musgrave 地区的隆升导致当时北部该地体的主要沉积物供应。在南部，最早的寒武纪沉积跟随局部构造作用，最初使局部近端基底源恢复活力。在寒武纪坎曼图群的底部发生了物源的突然变化，这是南部最年轻的沉积物包。古流数据表明来自南方的运输，可能来自以前毗连的南极洲，可能反映了前陆盆地的会聚构造和沉积的开始，与主要碎屑锆石种群的近沉积年龄相一致。虽然在 Hf 和 O 同位素数据中确定了几次显着的地壳改造事件，但许多锆石 TDM 年龄位于 U Pb 年龄的 0.5 Ga 之内，表明来自地幔的新添加物在物源区很常见。