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The Abu Mahara Group (Ghubrah and Fiq formations), Jabal Akhdar, Oman

By
Philip A. Allen
Philip A. Allen
1
Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
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Jonathan Leather
Jonathan Leather
2
Tullow Oil, 5th Floor, Block C, Central Park Leopardstown, Dublin 18, Ireland
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Martin D. Brasier
Martin D. Brasier
3
Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK
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Ruben Rieu
Ruben Rieu
4
TOTAL E&P Nederland, Bordewijklaan 18, Den Haag, The Netherlands
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Margaret Mccarron
Margaret Mccarron
3
Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK
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Erwan le Guerroué
Erwan le Guerroué
5
Beicip-Franlab, 232, Avenue Napoléon Bonaparte, 92502 Rueil-Malmaison, PO Box 213, France
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James L. Etienne
James L. Etienne
6
Neftex Petroleum Consultants Ltd, 97 Milton Park, Abingdon, Oxfordshire OX14 4RY, UK
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Andrea Cozzi
Andrea Cozzi
7
ENI Angola, Rua Nicola Gomes Spencer, 140, PO Box 1289, Luanda, Angola
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Published:
January 01, 2011

Abstract

The Abu Mahara Group (c. 725–<645 Ma) of the Huqf Supergroup in the Jabal Akhdar of northern Oman hosts two glacial successions in the Ghubrah and Fiq formations, separated by the <50-m-thick volcanogenic Saqlah Member. The >400-m-thick Ghubrah Formation is dominated by distal glaciogenic rainout diamictites, laminites and turbiditic siltstones, whereas the <1.5-km-thick Fiq Formation exhibits a cyclical stratigraphy of proximal and distal marine glaciogenic facies, and non-glacial sediment gravity flow and shallow marine facies. The Fiq Formation is overlain by a transgressive, isotopically light carbonate known as the Hadash Formation. A tuffaceous ash interbedded with glacial diamictites of the Ghubrah Formation in Wadi Mistal has yielded a U–Pb zircon age of 713.7±0.5 Ma. The Fiq Formation contains detrital zircons as young as 645 Ma. The use of the CIA (Chemical Index of Alteration) shows the Fiq Formation to be climatically cyclic, with alternations of high and low chemical weathering of contemporary land surfaces driven by phases of glaciation and deglaciation. The transgression into the post-glacial Masirah Bay Formation is marked by a major increase in chemical weathering.

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Contents

Geological Society, London, Memoirs

The Geological Record of Neoproterozoic Glaciations

Emmanuelle Arnaud
Emmanuelle Arnaud
University of Guelph, Canada
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Galen P. Halverson
Galen P. Halverson
McGill University, Canada
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Graham Shields-Zhou
Graham Shields-Zhou
University College London, UK
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Geological Society of London
Volume
36
ISBN electronic:
9781862394117
Publication date:
January 01, 2011

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