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Late-Proterozoic to Paleozoic history of the peri-Gondwana Calabria–Peloritani Terrane inferred from a review of zircon chronology

机译:从锆石年代学的回顾中推断出冈冈瓦纳卡拉布里亚-佩洛里塔尼地界的晚元古代至古生代历史

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摘要

U–Pb analyses of zircon from ten samples of augen gneisses, eight mafic and intermediate metaigneous rocks and six metasediments from some tectonic domains along the Calabria–Peloritani Terrane (Southern Italy) contribute to knowledge of peri-Gondwanan evolution from Late-Proterozoic to Paleozoic times. All samples were equilibrated under amphibolite to granulite facies metamorphism during the Variscan orogeny. The zircon grains of all considered samples preserve a Proterozoic memory suggestive of detrital, metamorphic and igneous origin. The available data fit a frame involving: (1) Neoproterozoic detrital input from cratonic areas of Gondwana; (2) Pan-African/Cadomian assemblage of blocks derived from East and West African Craton; (3) metamorphism and bimodal magmatism between 535 and 579 Ma, within an active margin setting; (4) rifting and opening of Ordovician basins fed by detrital input from the assembled Cadomian blocks. The Paleozoic basins evolved through sedimentation, metamorphism and magmatism during the Variscan orogeny involving Palaeozoic and pre-Paleozoic blocks. The Proterozoic zircon records decidedly decrease in the high grade metamorphic rocks affected by Variscan pervasive partial melting. Electronic supplementary materialThe online version of this article (doi:10.1186/s40064-016-1839-8) contains supplementary material, which is available to authorized users.
机译:从卡拉布里亚-佩洛里塔尼地形(意大利南部)沿一些构造域的十个奥氏片麻岩样品,八块镁铁质和中间变质岩和六块沉积物中的锆石进行U-Pb分析,有助于人们了解冈古纳河周缘从晚元古代到古生代的演化次。在Variscan造山过程中,所有样品均在角闪石下平衡成粒状相变质作用。所有考虑的样品中的锆石颗粒都保留了元古代记忆,暗示了碎屑,变质和火成岩的起源。现有数据符合以下框架:(1)冈瓦纳克拉通地区的新元古代碎屑输入; (2)源自东非和西非克拉通的泛非/加东地块组合; (3)在活动余量范围内,535至579 Ma之间的变质作用和双峰岩浆作用; (4)奥陶纪盆地的裂谷和开裂是由来自组合的Cadomian块的碎屑输入提供的。在包括古生代和前古生代的瓦里斯卡山造山运动中,古生代盆地通过沉积,变质和岩浆作用演化。受Variscan普遍部分熔融作用影响的高级变质岩中,元古代锆石记录确定减少。电子补充材料本文的在线版本(doi:10.1186 / s40064-016-1839-8)包含补充材料,授权用户可以使用。

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