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学科主题: Geochemistry & Geophysics
题名: Detrital U-Pb zircon dating of lower Ordovician syn-arc-continent collision conglomerates in the Irish Caledonides
作者: Clift, PD ; Carter, A ; Draut, AE ; Van Long, H ; Chew, DM ; Schouten, HA
通讯作者: pclift@abdn.ac.uk
关键词: Collision ; Erosion ; Zircon ; Caledonides ; Grampian
刊名: TECTONOPHYSICS
发表日期: 2009-01-01
卷: 479, 期:40545, 页:165-174
收录类别: sci
部门归属: [Clift, Peter D.; Van Long, Hoang] Univ Aberdeen, Sch Geosci, Aberdeen AB24 3UE, Scotland; [Carter, Andrew] Univ London, Sch Earth Sci, London WC1E 7HX, England; [Draut, Amy E.] USGS Pacific Sci Ctr, US Geol Survey, Santa Cruz, CA 95060 USA; [Chew, David M.] Trinity Coll Dublin, Dept Geol, Dublin 2, Ireland; [Schouten, Hans A.] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA
项目归属: 海洋地质
摘要: The Early Ordovician Grampian Orogeny in the British Isles represents a classic example of collision between an oceanic island arc and a passive continental margin, starting around 480 Ma. The South Mayo Trough in western Ireland preserves a complete and well-dated sedimentary record of arc collision. We sampled sandstones and conglomerates from the Rosroe, Maumtrasna and Derryveeny Formations in order to assess erosion rates and patterns during and after arc collision. U-Pb dating of zircons reveals a provenance dominated by erosion from the upper levels of the Dalradian Supergroup (Southern Highland and Argyll Groups), with up to 20% influx from the colliding arc into the Rosroe Formation, but only 6% in the Maumtrasna Formation (similar to 465 Ma). The dominant source regions lay to the northeast (e.g. in the vicinity of the Ox Mountains, 50 km distant, along strike). The older portions of the North Mayo Dalradian and its depositional basement (the Armagh Gneiss Complex) do not appear to have been important sources, while the Connemara Dalradian only plays a part after 460 Ma, when it supplies the Derryveeny Formation. By this time all erosion from the arc had effectively ceased and exhumation rates had slowed greatly. The Irish Grampian Orogeny parallels the modern Taiwan collision in showing little role for the colliding arc in the production of sediment. Negligible volumes of arc crust are lost because of erosion during accretion to the continental margin. (C) 2008 Elsevier B.V. All rights reserved.
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4664
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Clift, PD; Carter, A; Draut, AE; Van Long, H; Chew, DM; Schouten, HA.Detrital U-Pb zircon dating of lower Ordovician syn-arc-continent collision conglomerates in the Irish Caledonides,TECTONOPHYSICS,2009,479(40545):165-174
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