کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4458409 1620961 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dolomite formation in breccias at the Musandam Platform border, Northern Oman Mountains, United Arab Emirates
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
پیش نمایش صفحه اول مقاله
Dolomite formation in breccias at the Musandam Platform border, Northern Oman Mountains, United Arab Emirates
چکیده انگلیسی

The presence of dolomite breccia patches along Wadi Batha Mahani suggests large-scale fluid flow causing dolomite formation. The controls on dolomitization have been studied, using petrography and geochemistry. Dolomitization was mainly controlled by brecciation and the nearby Hagab thrust. Breccias formed as subaerial scree deposits, with clay infill from dissolved platform limestones, during Early Cretaceous emergence. Cathodoluminescence of the dolostones indicates dolomitization took place in two phases. First, fine-crystalline planar-s dolomite replaced the breccias. Later, these dolomites were recrystallized by larger non-planar dolomites. The stable isotope trend towards depleted values (δ18O: − 2.7‰ to − 10.2‰ VPDB and δ13C: − 0.6‰ to − 8.9‰ VPDB), caused by mixing dolomite types during sampling, indicates type 2 dolomites were formed by hot fluids. Microthermometry of quartz cements and karst veins, post-dating dolomites, also yielded high temperatures. Hot formation waters which ascended along the Hagab thrust are invoked to explain type 2 dolomitization, silicification and hydrothermal karstification.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Geochemical Exploration - Volume 89, Issues 1–3, April–June 2006, Pages 19–22
نویسندگان
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