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首页> 外文期刊>Journal of Asian earth sciences >Mid-Neoproterozoic mafic rocks in the western Jiangnan orogen, South China: Intracontinental rifting or subduction?
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Mid-Neoproterozoic mafic rocks in the western Jiangnan orogen, South China: Intracontinental rifting or subduction?

机译：华南西部江南造山带中新元古代镁铁质岩石：陆内裂谷还是俯冲？

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摘要

Widely distributed Meso- to Neoproterozoic igneous rocks record the evolution of the Jiangnan orogen. We present integrated geochemical and geochronological data for basalts from the Gaoqiao area, northwestern Hunan Province. U-Pb dating of zircons indicates that the formation of Gaoqiao basalts occurred in the Neoproterozoic, no earlier than 757 +/- 16 Ma. Like the contemporaneous mafic rocks in neighboring areas, the Gaoqiao basalts show trace element characteristics suggesting derivation from a source similar to ocean-island basalts (OIBs), including strong enrichment in large-ion lithophile elements (LILEs), high-field strength elements (HFSEs) and TiO2, and high Ti/Y ratios. Placed in a regional tectonic context, however, the Gaoqiao suite is most consistent with an intracontinental rift model and offers no support to the idea of ongoing subduction in middlelate Mid-Neoproterozoic time in the western Jiangnan orogen. Despite the coincidence between the age of this rift and the separation of East Antarctica-Australia from Laurentia, we argue that the rift recorded in the South China Block (SCB) was an independent and probably unrelated event during the break-up of the Rodinia supercontinent.
机译：中元古代至新元古代火成岩分布广泛，记录了江南造山带的演化。我们介绍了湘西北高桥地区玄武岩的综合地球化学和地球年代学数据。锆石的U-Pb定年表明高元玄武岩的形成发生在新元古代，不早于757 +/- 16Ma。像邻近地区的同期镁铁质岩石一样，高桥玄武岩也表现出痕量元素特征，表明其来源类似于海洋-岛玄武岩（OIBs），包括强离子富锂亲石元素（LILE），高场强元素（ HFSEs和TiO2，以及高的Ti / Y比。然而，高桥组位于区域构造背景下，与大陆内裂谷模型最吻合，并没有支持江南造山带中新中古中期中晚期俯冲的想法。尽管该裂谷的年代与南极东澳大利亚与劳伦西亚分离之间的巧合，我们认为在华南地块（Rodinia supercontinent）解体期间，华南地块（SCB）中记录的裂谷是一个独立且可能无关的事件。 。

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