Detrital zircon populations from six samples of upper Triassic sandstone (Algarve Basin) were analysed, yielding mostly Precambrian ages. zircon age populations of the Triassic sandstone sampled from the western and central sectors of the basin are distinct, suggesting local recycling and/or lateral changes in their sources. Our findings and the available detrital zircon ages from the Palaeozoic terranes of SW Iberia, Nova Scotia and NW Morocco were jointly examined using the Kolmogorov–Smirnov test and multidimensional scaling diagrams. The obtained results enable direct discrimination of competing Laurussian-type and Gondwanan-type sediment sources, involving recycling and mixing relationships. The detrital zircon populations of the Algarve Triassic sandstone are very different from those of the lower–upper Carboniferous Mértola and Mira formations (South Portuguese Zone), upper Devonian – lower Carboniferous Horta da Torre, Represa and Santa Iria formations (Pulo do Lobo Zone), and the late Carboniferous Santa Susana and early Permian Viar basins, which are ruled out as potential sources. The detrital zircon populations of Triassic sandstone from the central sector and those from the Ossa–Morena Zone Ediacaran–Cambrian siliciclastic rocks, upper Devonian – Carboniferous Ronquillo, Tercenas, Phyllite-Quartzite and Brejeira formations (South Portuguese Zone), and Frasnian siliciclastic rocks of the Pulo do Lobo Zone are not statistically distinguishable. Thus, sedimentation in the central sector was influenced by Gondwanan- and Laurussian-type putative sources exposed in SW Iberia, in contrast to the western sector, where Meguma Terrane and Sehoul Block Cambrian siliciclastic rocks allegedly constituted the main (Laurussian-type) sources. These findings provide insights into the denudation of distinctive source terranes distributed along the late Palaeozoic suture zone that juxtaposed the Laurussian and Gondwanan margins.

中文翻译：

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阿尔加维盆地（伊比利亚西南部）三叠纪砂岩的碎屑锆石来源：冈瓦南型和劳鲁斯型沉积物来源的证据

分析了来自上三叠统砂岩（阿尔加维盆地）的六个样品的碎屑锆石群，主要得出前寒武纪年龄。从盆地的西部和中部取样的三叠纪砂岩的锆石年龄群是不同的，这表明其来源的局部循环和/或横向变化。我们使用 Kolmogorov-Smirnov 检验和多维比例图联合检查了我们的研究结果和来自 SW Iberia、新斯科舍和 NW 摩洛哥的古生代地体的可用碎屑锆石年龄。获得的结果能够直接区分竞争的劳鲁斯型和冈瓦南型沉积物来源，涉及循环和混合关系。阿尔加维三叠统砂岩的碎屑锆石数量与下-上石炭统 Mértola 和 Mira 组（南葡萄牙区）、上泥盆统 - 下石炭统 Horta da Torre、Represa 和 Santa Iria 组（Pulo do Lobo 带）有很大不同，以及石炭纪晚期 Santa Susana 和二叠纪早期 Viar 盆地，被排除为潜在来源。中部三叠系砂岩的碎屑锆石群和来自埃迪卡拉纪-寒武纪硅质碎屑岩、上泥盆统-石炭纪 Ronquillo、Tercenas、千枚岩-石英岩和 Brejeira 组（南葡萄牙区）的碎屑锆石群，以及Pulo do Lobo 区域在统计上无法区分。因此，中部地区的沉积物受到伊比利亚西南部出露的冈瓦南和劳鲁斯型推定物源的影响，而在西部地区，据称 Meguma 地块和 Sehoul 块寒武系硅质碎屑岩构成主要（劳鲁斯型）来源。这些发现提供了对分布在晚古生代缝合带上的独特源地体剥蚀的见解，该缝合带与劳鲁斯和冈瓦南边缘并列。