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U–Pb detrital zircon ages from Gorgoglione Flysch sandstones in Southern Apennines (Italy) as provenance indicators
Geological Magazine ( IF 2.0 ) Pub Date : 2020-09-04 , DOI: 10.1017/s0016756820000886
Annamaria Fornelli , Salvatore Gallicchio , Francesca Micheletti , Antonio Langone

Twenty-one sandstone samples belonging to the intermediate part of Gorgoglione Flysch (GF) dated Middle-Miocene, cropping out in the Southern Apennines (Italy), have been studied to highlight the detritus provenance. Petrographic and chemical composition indicates that the successions consist of feldspatho-quartzose and litho-feldspatho-quartzose arenites interbedded with pelitic and calciclastic layers and reveals a provenance from a basement formed by low- to medium-grade metamorphic rocks with abundant granitoids covered by sedimentary rocks in which a volcanic component was also present. In the Mediterranean area, basements with these characteristics are widespread both in western and southwestern domains. The supply provenance of Gorgoglione Flysch has been better detailed utilizing U–Pb detrital zircon ages recording the geological history of the source rocks. Fifty-eight crystals from six samples of coarse- and fine-grained sandstones have been analysed using the U–Pb isotopic systematic (LA-ICP-MS). They produce 70 concordant zircon ages forming three defined clusters at 672 ± 28 Ma, 458 ± 9 Ma and 297 ± 8 Ma, and four zircon ages corresponding to 24 ± 1 Ma. An evaluation of the entire collected data suggests that the provenance area is better identified in northwestern sectors of the Mediterranean area in which the Sardinia–Corsica (pro-part) block plays a fundamental role.

中文翻译:

来自南亚平宁山脉(意大利)Gorgoglione Flysch 砂岩的 U-Pb 碎屑锆石年龄作为物源指标

已经研究了在南亚平宁山脉(意大利)出土的 21 个属于 Gorgoglione Flysch (GF) 中间部分的砂岩样品,这些样品的年代为中中新世,以突出碎屑的来源。岩石学和化学成分表明,该层序由长石-石英砂和岩屑-长石-石英砂岩组成,夹有泥质和钙质碎屑层,表明其物源来自中低品位变质岩形成的基底,沉积岩覆盖着丰富的花岗岩其中还存在火山成分。在地中海地区,具有这些特征的地下室在西部和西南部地区普遍存在。利用 U-Pb 碎屑锆石年龄记录了烃源岩的地质历史,可以更好地详细说明 Gorgoglione Flysch 的供应来源。使用 U-Pb 同位素系统 (LA-ICP-MS) 分析了来自 6 个粗粒和细粒砂岩样品的 58 个晶体。它们产生了 70 个一致的锆石年龄,在 672 ± 28 Ma、458 ± 9 Ma 和 297 ± 8 Ma 处形成三个定义的簇,以及对应于 24 ± 1 Ma 的四个锆石年龄。对整个收集数据的评估表明,在撒丁岛-科西嘉岛(前部分)地块发挥基本作用的地中海地区西北部地区,可以更好地确定物源区。它们产生了 70 个一致的锆石年龄,在 672 ± 28 Ma、458 ± 9 Ma 和 297 ± 8 Ma 处形成三个定义的簇,以及对应于 24 ± 1 Ma 的四个锆石年龄。对整个收集数据的评估表明,在撒丁岛-科西嘉岛(前部分)地块发挥基本作用的地中海地区西北部地区,可以更好地确定物源区。它们产生了 70 个一致的锆石年龄,在 672 ± 28 Ma、458 ± 9 Ma 和 297 ± 8 Ma 处形成三个定义的簇,以及对应于 24 ± 1 Ma 的四个锆石年龄。对整个收集数据的评估表明,在撒丁岛-科西嘉岛(前部分)地块发挥基本作用的地中海地区西北部地区,可以更好地确定物源区。
更新日期:2020-09-04
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