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Author Nasir, Sobhien_US
Author Al-Saad, Hamaden_US
Author Alsayigh, Abudlrazaken_US
Author Weidlich, Oliveren_US
Available date 2009-12-29T06:39:12Zen_US
Publication Date 2008-02-07en_US
Publication Name Journal of Asian Earth Sciences
Identifier http://dx.doi.org/10.1016/j.jseaes.2008.02.003
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), 353–365en_US
URI http://hdl.handle.net/10576/10551en_US
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 enen_US
Publisher Elsevier Ltden_US
Subject Cambrianen_US
Subject Dolomiteen_US
Subject Geochemistryen_US
Subject Halul Islanden_US
Subject Hormuzen_US
Subject Qataren_US
Subject Shraouh Islanden_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 Qataren_US
Type Articleen_US


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