Timing of ophiolite obduction in the Grampian orogen

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F10%3A00000015" target="_blank" >RIV/00025798:_____/10:00000015 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Timing of ophiolite obduction in the Grampian orogen
Original language description
We address the p-T-t conditions of ophiolite obduction of the 470 Ma Grampian orogeny of Scotland and Ireland. This event gave rise to the main structural and metamorphic characteristics of the Grampian type area for Barrovian metamorphism. Zircons fromthe Highland Border ophiolite define a 499Ma U-Pb concordia age, interpreted as dating magmatism. Its metamorphism is dated by a 490Ma 40Ar-39Ar hornblende age, and a 488Ma 40Ar-39Ar muscovite age from a metasedimentary xenolith. Metamorphism of the Deerpark complex ophiolitic mélange is constrained by a 514Ma 40Ar-39Ar hornblende age, while mica schist slivers yield detrital zircon U-Pb ages consistent with Laurentian provenance and Rb-Sr and 40Ar-39Ar muscovite ages of ca. 482 Ma. Metamorphic mineralages from the Grampian terrane (Dalradian Supergroup) are substantially younger (ca. 475?465Ma). If conductive heating in overthickened crust caused Barrovian metamorphism, then collisional thickening must have started soon after ophiolit
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DB - Geology and mineralogy
OECD FORD branch
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Project
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Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2010
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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