Timing of ophiolite obduction in the Grampian orogen

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Fältnamn	Indikatorer	Metadata
000		03186naa a2200349 4500
001		oai:lup.lub.lu.se:a73050eb-af65-409d-b379-e86c751c083d
003		SwePub
008		160401s2010 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://lup.lub.lu.se/record/17196902 URI
024	7	a https://doi.org/10.1130/B30139.12 DOI
040		a (SwePub)lu
041		a engb eng
042		9 SwePub
072	7	a art2 swepub-publicationtype
072	7	a ref2 swepub-contenttype
100	1	a Chew, David M.4 aut
245	1 0	a Timing of ophiolite obduction in the Grampian orogen
264	1	c 2010
520		a This study addresses the timing and pressure-temperature (P-T) conditions of ophiolite obduction, one of the proposed causes of the ca. 470 Ma Grampian orogeny of Scotland and Ireland. This event gave rise to the main structural and metamorphic characteristics of the Grampian terrane-the type area for Barrovian metamorphism, the cause of which remains enigmatic despite a century of research. Zircons from the Highland Border ophiolite, Scotland, define a 499 +/- 8 Ma U-Pb concordia age, which is interpreted as dating magmatism. Its metamorphism is dated by a 490 +/- 4 Ma Ar-40-Ar-39 hornblende age, and a 488 +/- 1 Ma Ar-40-Ar-39 muscovite age from a metasedimentary xenolith within it, from which P-T estimates of 5.3 kbar and 580 degrees C relate to ophiolite obduction. Metamorphism of the Deerpark complex ophiolitic melange (Irish correlative of the Highland Border ophiolite) is constrained by a 514 +/- 3 Ma Ar-40-Ar-39 hornblende age, while mica schist slivers within it yield detrital zircon U-Pb ages consistent with Laurentian provenance and Rb-Sr and Ar-40-Ar-39 muscovite ages of ca. 482 Ma. P-T values of 3.3 kbar and 580 degrees C for the mica schist constrain the conditions of ophiolite obduction. Metamorphic mineral ages from the Grampian terrane (Dalradian Supergroup) are substantially younger (ca. 475-465 Ma) than those from the ophiolites. If conductive heating in overthickened crust was the cause of Barrovian metamorphism, then collisional thickening must have started soon after ophiolite obduction at ca. 490 Ma in order to generate the ca. 470 Ma metamorphic peak in the Grampian terrane.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geologi0 (SwePub)105042 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geology0 (SwePub)105042 hsv//eng
700	1	a Daly, J. Stephen4 aut
700	1	a Magna, Tomas4 aut
700	1	a Page, Laurenceu Lund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science4 aut0 (Swepub:lu)geol-lpa
700	1	a Kirkland, Christopher L.4 aut
700	1	a Whitehouse, Martin J.4 aut
700	1	a Lam, Rebecca4 aut
710	2	a Berggrundsgeologib Geologiska institutionen4 org
773	0	t Geological Society of America Bulleting 122:11-12, s. 1787-1799q 122:11-12<1787-1799x 0016-7606
856	4	u http://dx.doi.org/10.1130/B30139.1y FULLTEXT
856	4 8	u https://lup.lub.lu.se/record/1719690
856	4 8	u https://doi.org/10.1130/B30139.1

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Av författaren/redakt...: Chew, David M.; Daly, J. Stephen; Magna, Tomas; Page, Laurence; Kirkland, Christ ...; Whitehouse, Mart ...; visa fler...; Lam, Rebecca; visa färre...

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Av lärosätet: Lunds universitet

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