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Origin and tectonic evolution of the NE basement of Oman: a window into the Neoproterozoic accretionary growth of India?

Published online by Cambridge University Press:  07 March 2017

BRANDON L. ALESSIO Open the ORCID record for BRANDON L. ALESSIO [Opens in a new window] ,
MORGAN L. BLADES ,
GEORGE MURRAY ,
BENJAMIN THORPE ,
ALAN S. COLLINS ,
DAVID E. KELSEY ,
JOHN FODEN ,
JUSTIN PAYNE ,
SALAH AL-KHIRBASH  and
FRED JOURDAN
BRANDON L. ALESSIO*
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
MORGAN L. BLADES
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
GEORGE MURRAY
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
BENJAMIN THORPE
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
ALAN S. COLLINS
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
DAVID E. KELSEY
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
JOHN FODEN
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
JUSTIN PAYNE
Affiliation:
Centre for Tectonics, Resources and Exploration (TRaX), School of Built and Natural Environments, University of South Australia, Adelaide, SA 5095, Australia
SALAH AL-KHIRBASH
Affiliation:
Sultan Qaboos University, Al Khoudh 123, Muscat, Oman
FRED JOURDAN
Affiliation:
Western Australian Argon Facility, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
*
†Author for correspondence: [email protected]
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Abstract

The 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.

Keywords

Jebel Ja'alanU–Pb geochronologythermochronologypseudosectionpalaeogeography
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 5 , July 2018 , pp. 1150 - 1174
Copyright
Copyright © Cambridge University Press 2017 

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