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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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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dc.contributor.author Nasir, S.
dc.contributor.author Al-Saad, H.
dc.contributor.author Alsayigh, A.
dc.contributor.author Weidlich, O.
dc.date.accessioned 2009-12-29T06:39:12Z
dc.date.available 2009-12-29T06:39:12Z
dc.date.issued 2008-02-07
dc.identifier.citation Volume 33, Issue 5-6, 25 August 2008, Pages 353-365 en_US
dc.identifier.uri http://dx.doi.org/10.1016/j.jseaes.2008.02.003
dc.identifier.uri http://hdl.handle.net/10576/10551
dc.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
dc.language.iso en en_US
dc.subject Cambrian en_US
dc.subject Dolomite en_US
dc.subject Geochemistry en_US
dc.subject Halul Island en_US
dc.subject Hormuz en_US
dc.subject Qatar en_US
dc.subject Shraouh Island en_US
dc.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
dc.type Article en_US

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