Geology and petrology of the Hormuz dolomite, Infra-Cambrian: Implications for the formation of the salt-cored Halul and Shraouh islands, Offshore, State of Qatar

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contributor.author Nasir, Sobhi en_US
contributor.author Al-Saad, Hamad en_US
contributor.author Alsayigh, Abudlrazak en_US
contributor.author Weidlich, Oliver en_US
date.accessioned 2009-12-29T06:39:12Z en_US
date.available 2009-12-29T06:39:12Z en_US
date.issued 2008-02-07 en_US
identifier.citation Nasir, S., Al-Saad, H., Alsayigh, A., & Weidlich, O. (2008). Geology and petrology of the Hormuz dolomite, Infra-Cambrian: Implications for the formation of the salt-cored Halul and Shraouh islands, Offshore, State of Qatar. Journal of Asian Earth Sciences, 33(5–6), 353–365 en_US
identifier.uri http://dx.doi.org/10.1016/j.jseaes.2008.02.003 en_US
identifier.uri http://hdl.handle.net/10576/10551 en_US
description.abstract Geological investigations of the Halul and the Shraouh islands, offshore Qatar, indicate that most of their calcareous rocks, which display abundant stromatolitic bedding, belong to the Infra-Cambrian Hormuz Series. Mineralogical, petrological, and geochemical analyses show that these calcareous rocks consist dominantly of dolomite and have formed in a reducing depositional environment. Faint laminations and small streaks of organic matter furnish evidence for the involvement of algal mats in their genesis and indicate their formation in an intertidal to supratidal setting. The Halul and Shraouh dolomites experienced extensive recrystallization and sulfatization during the emplacement of the Halul and Shraouh salt domes that form the cores of the islands. During mobilization and ascent of the salt, the dolomite recrystallized, and its Sr initial ratios were abnormally enhanced by the incorporation of 87Sr from a source, which is more radiogenic than the attendant seawater at the time of the dolomite formation near the Proterozoic–Cambrian boundary. Geochemical analysis show that Si, Al, Ti Zr, and % of insoluble residue are highly correlative, suggesting the presence of detrital minerals such as rutile and zircon. A paleosabkha model may well agree with this chemical signature. However, the Infra-Cambrian age of the Hormuz rocks and the presence of stromatolitic layers containing organic materials in the studied rocks, suggest that organogenic dolomitization could be an alternative dolomitization model. en_US
language.iso en en_US
publisher Elsevier Ltd en_US
subject Cambrian en_US
subject Dolomite en_US
subject Geochemistry en_US
subject Halul Island en_US
subject Hormuz en_US
subject Qatar en_US
subject Shraouh Island en_US
title Geology and petrology of the Hormuz dolomite, Infra-Cambrian: Implications for the formation of the salt-cored Halul and Shraouh islands, Offshore, State of Qatar en_US
type Article en_US


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