北爱尔兰特雷纳岩石微砾岩的成因:伊阿佩图斯洋关闭期的中志留纪(哈维克组)海底通道扇形沉积物

N. Moles, Mark R. Cooper, S. Hollis, B. McConnell
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引用次数: 0

摘要

位于莫恩山脉 Trainor's Rocks 的鹅卵状砂岩-微砾岩露头是奥陶纪-志留纪南高地-唐-龙福德地层中最年轻(430 Ma)的粗碎屑岩单元之一。400 米乘 1 公里的露头位于细粒霍维克组(文洛克)地层中,富含形态外碎屑岩,包括花岗岩、流纹岩、安山岩、玄武岩、脉石英和变质岩,以及泥岩的形态内裂隙碎屑岩。经 SHRIMP 分析的碎屑锆石主要得出 450-490 Ma 的奥陶纪 U-Pb 年龄,峰值在 ∼470 Ma,与米德兰谷地带的弧状岩浆活动相吻合。整块岩石的地球化学数据与钙碱性大陆弧的衍生物一致,碎屑来源与泰隆火成岩群的 473-464 Ma 弧火山岩和侵入岩相吻合。一小部分经分析的锆石具有典型的新生代和新元古代年龄,这些锆石来自达拉地亚超群(格兰扁地层)的沉积物。所分析的最年轻的锆石(435 ±8 Ma)可能表明,岩浆活动在兰德韦尔的伊佩图斯闭合期间仍在继续。在这些样本中,没有证据表明冈瓦纳沉积物来自冈瓦纳。从火山弧-洛伦兹腹地涌入的碎屑表明,在联合沉积的走向-滑动运动的作用下,发生了偶发性的构造解顶。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Provenance of the Trainor's Rocks microconglomerate, Northern Ireland: a mid-Silurian (Hawick Group) submarine channel fan deposit in the closing Iapetus Ocean
A pebbly gritstone–microconglomerate outcrop at Trainor's Rocks in the Mourne Mountains is one of the youngest (∼430 Ma) coarse clastic units within the Ordovician-Silurian Southern Uplands – Down-Longford Terrane. The ∼400m by 1 km outcrop lies within fine-grained Hawick Group (Wenlock) strata, and is rich in extraformational clasts including granite, rhyolite, andesite, basalt, vein quartz and metamorphic rocks, plus intraformational rip-up clasts of mudstone. Detrital zircons, analysed by SHRIMP, yield predominantly Ordovician U-Pb ages of 450-490 Ma, peaking at ∼470 Ma, coincident with arc-related magmatism in the Midland Valley Terrane. Whole rock geochemical data are consistent with derivation from a calc-alkaline continental arc, with clast provenance matching 473-464 Ma arc volcanic and intrusive rocks from the Tyrone Igneous Complex. A small proportion of analysed zircons have Proterozoic and Neoarchaean ages typical of sediments derived from the Dalradian Supergroup (Grampian Terrane). The youngest zircon analysed, 435 ±8 Ma, may indicate that magmatism continued during closure of Iapetus in the Llandovery. In these samples there is no evidence for Gondwana-derived sediment. The influx of detritus from the volcanic arc–Laurentian hinterland suggests episodic tectonic unroofing in response to syndepositional strike-slip movements.
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