爱尔兰南部上泥盆纪老红砂岩的沉积出处:综合多代理析出地质年代研究

B. Fairey, Aidan Kerrison, P. Meere, Kieran F. Mulchrone, M. Zieger-Hofmann, A. Gärtner, Benita-Lisette Sonntag, U. Linnemann, Klaudia F. Kuiper, M. Ennis, Chris Mark, N. Cogné, David Chew
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引用次数: 0

摘要

爱尔兰南部泥盆纪老红砂岩(ORS)岩相位于下泥盆纪丁格尔盆地和上泥盆纪明斯特盆地。在喀里多尼亚造山运动期间伊阿佩图斯洋关闭之后,丁格尔盆地在受到阿卡迪亚构造活动的影响而发生变形之前,发展成为一个拉裂构造。芒斯特盆地在该地区后阿卡迪亚N-S伸展过程中形成了半堑壕结构。因此,爱尔兰ORS在时间和空间上接近于加里东期(475-425 Ma)、阿卡迪亚期(400-390 Ma)和瓦里斯坎期(390-290 Ma)的造山活动,为了解该地区的构造历史提供了线索。本研究首次提出了爱尔兰南部上ORS的锆英石和磷灰石U-Pb地质年代数据,以及白云母40 Ar/ 39 Ar地质年代数据,以帮助揭示爱尔兰上ORS的沉积历史,并评估沉积循环在上泥盆纪盆地发展中可能发挥的作用。 大多数上泥盆纪(UORS)样本几乎不含新近纪晚期的碎屑锆石颗粒,而是以早古生代和大约 1.1 Ga 的锆石为主。这些锆石群代表了具有劳伦伦亲缘关系的南部-高地-隆福-下地层的奥陶纪至志留纪北源地层的再循环,而不是以前认为的下奥陶纪地层的再循环(其中含有大量新近纪晚期的碎屑锆石)。在伊比利亚半岛 Pulo do Lobo 区的给统-新生代石英岩中也观察到了类似的碎屑锆石日期,这提供了莱茵洋与 UORS 的可能联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sedimentary provenance of the Upper Devonian Old Red Sandstone of southern Ireland: An integrated multi-proxy detrital geochronology study
The Devonian Old Red Sandstone (ORS) magnafacies of southern Ireland is hosted in the Lower Devonian Dingle Basin and the Upper Devonian Munster Basin. Following the closure of the Iapetus Ocean during the Caledonian Orogeny, the Dingle Basin developed as a pull-apart structure before being deformed by Acadian tectonic activity. The Munster Basin developed as a half-graben structure in response to post-Acadian N-S extension in the region. Thus, the Irish ORS provides insights into the region's tectonic history due to its temporal and spatial proximity to the Caledonian (∼475-425 Ma), Acadian (∼400-390 Ma) and Variscan orogenic events (∼390-290 Ma). This study presents the first detrital zircon and apatite U-Pb geochronological data for the UORS in southern Ireland in addition to detrital white mica 40 Ar/ 39 Ar geochronological data to help unravel the depositional history of the Irish UORS and to assess the possible role of sedimentary recycling in Upper Devonian basin development.  Most Upper ORS (UORS) samples contain few late Neoproterozoic detrital zircon grains and are instead dominated by early Palaeozoic and ca. 1.1 Ga zircons. These populations represent recycling of northerly-derived Ordovician to Silurian strata of the Southern-Uplands-Longford-Down terrane which are of Laurentian affinity, and not recycling of Lower ORS (which contain a significant number of late Neoproterozoic detrital zircons) as previously thought. Similar detrital zircon dates have been observed in Givetian-Frasnian quartzites of the Pulo do Lobo Zone on the Iberian Peninsula, providing a possible Rheic Ocean link with the UORS.
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