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Neoproterozoic evolution of the eastern Arabian basement based on a refined geochronology of the Marbat region, Sultanate of Oman

By
Nina E. Rantakokko
Nina E. Rantakokko
1
Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
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Martin J. Whitehouse
Martin J. Whitehouse
1
Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
2
Swedish Museum of Natural History & Nordic Center for Earth Evolution (NordCEE), Box 50007, SE-104 05 Stockholm, Sweden
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Victoria Pease
Victoria Pease
1
Department of Geological Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
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Brian F. Windley
Brian F. Windley
3
Department of Geology, University of Leicester, Leicester, LE1 7RH, UK
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Published:
January 01, 2014

Abstract

New high spatial resolution secondary ion mass spectrometry (SIMS) U–Pb zircon data from the Sadh gneiss complex and the intruding Marbat granodiorite of the Marbat region, southern Sultanate of Oman, yield Cryogenian magmatic protolith ages for gneisses ranging from c. 850 to 830 Ma. Zircon ages record a c. 815–820 Ma period of deformation and migmatization, followed by intrusion of a hornblende gabbro/diorite and the undeformed Marbat granodiorite at c. 795 Ma. Following break-up and rifting of Rodinia at c. 870 Ma, crustal growth in the Marbat region occurred via arc accretion at c. 850–790 Ma, possibly in the easternmost part of the Mozambique Ocean based on earlier cessation of accretion here compared to the Arabian–Nubian Shield. Similarity of the new zircon geochronology to peaks of detrital zircon ages in the unconformably overlying Ediacaran Marbat sandstone suggests relatively local derivation from uplifted basement for the latter.

Supplementary material:

Detailed petrographic descriptions and photographs of hand specimens and thin-sections are available at http://www.geolsoc.org.uk/SUP18685.

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Contents

Geological Society, London, Special Publications

Tectonic Evolution of the Oman Mountains

H. R. Rollinson
H. R. Rollinson
University of Derby, UK
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M. P. Searle
M. P. Searle
Oxford University, UK
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I. A. Abbasi
I. A. Abbasi
Sultan Qaboos University, Muscat, Oman
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A. I. Al-Lazki
A. I. Al-Lazki
Petroleum Development Oman, Oman
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M. H. Al Kindi
M. H. Al Kindi
Petroleum Development Oman, Oman
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Geological Society of London
Volume
392
ISBN electronic:
9781862396685
Publication date:
January 01, 2014

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