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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Gondwanan basement terranes of the Variscan-Appalachian orogen: Baltican, Saharan and West African hafnium isotopic fingerprints in Avalonia, Iberia and the Armorican Terranes
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Gondwanan basement terranes of the Variscan-Appalachian orogen: Baltican, Saharan and West African hafnium isotopic fingerprints in Avalonia, Iberia and the Armorican Terranes

机译：瓦里坎-阿巴拉契亚造山带的冈瓦南基底地层：阿瓦隆，伊比利亚和阿尔莫里肯山地的波罗的海，撒哈拉沙漠和西非ha同位素指纹图谱

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摘要

Iberia, Avalonia and the "Armorican" terranes form key constituents of the Variscan-Appalachian orogen, but their Neoproterozoic origins along the northern Gondwanan margin continue to be strongly debated. Here, we present a new detrital zircon U-Pb-Hf dataset from Neoproterozoic-Silurian sedimentary sequences in NW Iberia and Avalonia, in conjunction with the comprehensive existing datasets from potential source cratons, to demonstrate that the provenance of each terrane is relatively simple and can be traced back to three major cratons. The enigmatic Tonian-Stenian detrital zircons in autochthonous Iberian rocks were derived from the Saharan metacraton in the latest Neoproterozoic-early Cambrian. Avalonia is commonly considered to have been derived from the Amazonian margin of Gondwana, but the hafnium isotopic characteristics of the detrital zircon grains in early Neoproterozoic rocks bear much stronger similarities to Baltica. The hafnium isotopic array also suggests the early Avalonian oceanic arc was built on a sliver of "Grenvillian-type crust" (similar to 2.0-1.0 Ga) possibly of Baltican affinity at similar to 800 Ma, prior to accretion with a continental margin at similar to 640 Ma. The Upper Allochthon of Iberia is frequently linked to the West African Craton in the late Neoproterozoic-early Cambrian, however the hafnium isotopic array presented here does not support this connection; rather it is more similar to the hafnium array from Avalonia. The Armorican terranes have strong detrital zircon isotopic links to the West African Craton during the late Neoproterozoic-Cambrian. (C) 2015 Elsevier B.V. All rights reserved.
机译：伊比利亚，阿瓦隆和“ Armorican”地层构成了瓦里斯卡纳-阿巴拉契亚造山带的主要成分，但它们在冈瓦纳北部北部沿新元古代的起源一直受到强烈争议。在此，我们结合来自西北伊比利亚和阿瓦隆的新元古代-西罗纪沉积序列的碎屑锆石U-Pb-Hf数据集，以及来自潜在克拉通的综合现有数据集，来证明每个地层的来源相对简单且可以追溯到三个主要克拉通。土生伊比利亚岩石中神秘的Tonian-Stenian碎屑锆石来自最新新元古代-早寒武纪的撒哈拉大克拉通。通常认为Avalonia来自冈瓦纳的亚马逊河边缘，但是新元古代早期岩石中碎屑锆石的the同位素特征与Baltica有更强的相似性。 iso同位素阵列还表明，早期的阿瓦隆洋弧是建立在“格伦维连型地壳”（类似于2.0-1.0 Ga）的条带上的，可能具有类似于800 Ma的波罗的海亲和力，然后在大陆边缘增加了类似的沉积物。至640 Ma。伊比利亚的上等温层通常与新元古代晚期-寒武纪早期的西非克拉通相连，但是这里介绍的ha同位素阵列不支持这种联系。而是与Avalonia的array阵列更相似。在新元古代-寒武纪晚期，阿莫里肯山脉与西非克拉通具有强烈的碎屑锆石同位素联系。 （C）2015 Elsevier B.V.保留所有权利。

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