Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/117348
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dc.contributor.authorAlessio, B.en
dc.contributor.authorBlades, M.en
dc.contributor.authorMurray, G.en
dc.contributor.authorThorpe, B.en
dc.contributor.authorCollins, A.en
dc.contributor.authorKelsey, D.en
dc.contributor.authorFoden, J.en
dc.contributor.authorPayne, J.en
dc.contributor.authorAl-Khirbash, S.en
dc.contributor.authorJourdan, F.en
dc.date.issued2018en
dc.identifier.citationGeological Magazine, 2018; 155(5):1150-1174en
dc.identifier.issn0016-7568en
dc.identifier.issn1469-5081en
dc.identifier.urihttp://hdl.handle.net/2440/117348-
dc.description.abstractThe Omani basement is located spatially distant from the dominantly juvenile Arabian–Nubian Shield (ANS) to its west, and its relationship to the amalgamation of those arc terranes has yet to be properly constrained. The Jebel Ja'alan (NE Oman) basement inlier provides an excellent opportunity to better understand the Neoproterozoic tectonic geography of Oman and its relationship to the ANS. To understand the origin of this basement inlier, we present new radiogenic isotopic data from igneous bodies in Jebel Ja'alan. U–Pb and 40Ar/39Ar geochronological data are used to constrain the timing of magmatism and metamorphism in the jebel. Positive εHf and εNd values indicate a juvenile origin for the igneous lithologies. Phase equilibria modelling is used to constrain the metamorphic conditions recorded by basement. Pressure–temperature (P–T) pseudosections show that basement schists followed a clockwise P–T path, reaching peak metamorphic conditions of c. 650–700°C at 4–7.5 kbar, corresponding to a thermal gradient of c. 90–160°C/kbar. From the calculated thermal gradient, in conjunction with collected trace-element data, we interpret that the Jebel Ja'alan basement formed in an arc environment. Geochronological data indicate that this juvenile arc formed during Tonian time and is older than basement further west in Oman. We argue that the difference in timing is related to westwards arc accretion and migration, which implies that the Omani basement represents its own tectonic domain separate to the ANS and may be the leading edge of the Neoproterozoic accretionary margin of India.en
dc.description.statementofresponsibilityBrandon L . Alessio, Morgan L . Blades, George Murray, Benjamin Thorpe, Alan S . Collins, David E . Kelsey, John Foden, Justin Payne, Salah Al-Khirbash and Fred Jourdanen
dc.language.isoenen
dc.publisherCambridge University Pressen
dc.rights© Cambridge University Press 2017.en
dc.subjectJebel Ja'alan; U–Pb geochronology; thermochronology; pseudosection; palaeogeographyen
dc.titleOrigin and tectonic evolution of the NE basement of Oman: a window into the Neoproterozoic accretionary growth of India?en
dc.typeJournal articleen
dc.identifier.rmid0030065896en
dc.identifier.doi10.1017/S0016756817000061en
dc.relation.granthttp://purl.org/au-research/grants/arc/FT120100340en
dc.identifier.pubid292531-
pubs.library.collectionGeology & Geophysics publicationsen
pubs.library.teamDS10en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidAlessio, B. [0000-0001-7288-8713]en
dc.identifier.orcidCollins, A. [0000-0002-3408-5474]en
dc.identifier.orcidFoden, J. [0000-0003-3564-7253]en
Appears in Collections:Geology & Geophysics publications

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