U–Pb zircon constraints on obduction initiation of the Unst Ophiolite: an oceanic core complex in the Scottish Caledonides?
收藏Geological Society of London research repository2016-06-21 更新2026-05-11 收录
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https://geolsoc.figshare.com/articles/dataset/U_Pb_zircon_constraints_on_obduction_initiation_of_the_Unst_Ophiolite_an_oceanic_core_complex_in_the_Scottish_Caledonides_/3453911/1
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资源简介：
The Unst Ophiolite is the best exposed of a chain of early Ordovician ophiolites in the Scottish Caledonides and is widely regarded as having formed in a supra-subduction zone setting within the Iapetus Ocean. Reinterpretation of sheeted dykes suggests that it formed as an oceanic core complex, presumably during subduction roll-back immediately prior to obduction onto the Laurentian margin. A new U–Pb zircon age of 484 ± 4 Ma for development of the metamorphic sole places a lower limit on the timing of obduction, which was subsequently followed by regional-scale crustal thickening and Barrovian metamorphism during the Grampian orogenic event.
提供机构：
Q. G. Crowley; R. A. Strachan
创建时间：
2016-06-21
