Shifts in the Ediacaran to Lower Ordovician sedimentary zircon provenances of Northwest Gondwana: the Pyrenean files

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2022-10-21 DOI:10.1344/geologicaacta2022.20.14
M. Padel, S. Clausen, M. Poujol, Jose Javier Alvaro Blasco
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Abstract

Detrital zircon grains from Cambrian–Lower Ordovician sandstones and quartzites sampled in the Pyrenees were dated by LA-ICPMS in order to assess their provenance sources. Resulting age distributions are compared to other available datasets from neighbouring margins, such as Morocco, the Iberian Peninsula, southern France and Sardinia. Kolmogorov-Smirnov (K-S) test and Crystallization Age-Depositional Age (CA-DA) diagrams were used to compare zircon populations estimating their possible correlation with the arc/rift/drift geodynamic evolution of the northwestern Gondwana margin. During Terreneuvian times, zircon populations allowed the distinction of i) a southwesternmost edge (Anti-Atlas-Ossa-Morena Rift) mostly influenced by Panafrican and Anti-Atlasian sources (ca. 0.63–0.54), ii) a northeasternmost edge (Sardinia) recording the influence of the Saharan Metacraton and the Arabian Nubian Shield, with an distinct Stenian–Tonian shift (ca. 1.25–0.85Ga) and iii) an intermediate palaeogeographic transect, where lies the Central-Iberian, West Asturian-Leonese and Cantabrian Zones, the Montagne Noire and the Pyrenees sharing similar populations and a chronologically progressive influence from Anti-Atlasian/Panafrican to Saharan Metacraton/Arabian Nubian Shield sources. This gradual modification in zircon percentage populations supports similar trends based on climatically sensitive indicators, biogeographic patterns of Cambrian Epoch 2 archaeocyathan and microfossil assemblages, and laterally correlatable episodes of carbonate production, all of them pointing to a Cambrian setting for the Pyrenean Basin between the Montagne Noire (Occitan Domain) and the Sardinian margins of NW Gondwana. The Terreneuvian zircon patterns recorded in the Pyrenees gradually evolved from Cambrian Epoch 2 to Early Ordovician times, reflecting the geodynamic evolution from Panafrican and Cadomian arc-related to rift-dominant conditions. During Furongian and Ordovician times, the relative percentage of zircon populations led to a more spread age curve, characteristic of extensional settings and pointing to rift (passive margin) conditions.
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冈瓦纳大陆西北部埃迪卡拉纪-下奥陶世沉积锆石来源的变化:比利牛斯纪文件
通过LA-ICPMS对比利牛斯山寒武系-下奥陶统砂岩和石英岩中的碎屑锆石颗粒进行了年代测定,以评估其物源。将由此产生的年龄分布与邻近边缘的其他可用数据集进行比较,如摩洛哥、伊比利亚半岛、法国南部和撒丁岛。Kolmogorov-Smirnov(K-S)检验和结晶年龄-沉积年龄(CA-DA)图用于比较锆石种群,估计它们与冈瓦纳大陆西北边缘弧/裂谷/漂移地球动力学演化的可能相关性。在Terreneuvian时代,锆石种群允许区分i)最西南边缘(Anti-Atlas Ossa Morena裂谷),主要受泛非洲和反大西洋来源的影响(约0.63–0.54),ii)记录撒哈拉元克拉通和阿拉伯-努比亚地盾影响的最东北边缘(撒丁岛),具有明显的斯堪的纳维亚-托尼亚期偏移(约1.25–0.85Ga)和iii)一个中间古地理样带,其中位于中伊比利亚、西阿斯图里亚莱昂和坎塔布里亚带、黑山和比利牛斯山,具有相似的人口和从反大西洋/泛非大陆到撒哈拉元克拉通/阿拉伯-努比亚地盾来源的时间上的渐进影响。锆石百分比种群的这种逐渐变化支持了基于气候敏感指标、寒武纪2古脊椎动物和微体化石组合的生物地理模式以及碳酸盐生产的横向相关事件的类似趋势,所有这些都指向了比利牛斯盆地的寒武纪背景,该盆地位于诺伊山(欧西坦地区)和冈瓦纳大陆西北部的撒丁岛边缘之间。比利牛斯山脉记录的Terreneuvian锆石模式从寒武纪2世到早奥陶世逐渐演化,反映了与裂谷主导条件有关的Panafrican弧和Cadomian弧的地球动力学演化。在芙蓉期和奥陶纪,锆石种群的相对百分比导致了更为广泛的年龄曲线,具有伸展环境的特征,并指向裂谷(被动边缘)条件。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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