دراسة الانواع الرئيسية لصخور اللابا الوسادية في منطقة البسيط/سورية
Abstract
يعنى البحث بدراسة الأنواع الصخرية المختلفة للابا الوسادية، حيث تم تمييز أربعة أنواع رئيسية من الصخور الأساسية: بازلت أولفيني، وغابرو- بازلت، وغابرو- بازلت ذو امفيبول، وغابرو- دولوريت.
قمنا بدراسة (50) شريحة صخرية مجهرية، وحوالي (150) عينة صخرية، جمعت من عدة نطاقات في منطقة البسيط، وأجرينا عليها مختلف الدراسات البتروغرافية ، والمنرالوجية ، والبنيوية، والنسيجية مستخدمين المجهر الاستقطابي.
اجرينا حوالي (57 ) تحليلا جيوكيميائيا على العينات الصخرية بحيث تشمل كافة الأنواع الصخرية المدروسة ، حيث اشارت التحاليل الى ان صخور اللابا الوسادية عبارةعن انسكابات مهلية بحرية بازلتية التركيب و تنتسب الى عائلة الصخور الكلسية - القلوية منخفضة البوتاسيوم.
لقد تشكلت نتيجة لمرحلتين من التبلور : مرحلة اولية داخل الغرفة المهلية الاولية، ومرحلة سطحية مائية. ولقد تعرضت صخور اللابا الوسادية في مرحلة لاحقة للفساد في ظروف سطحية قارية.
- The aim of this research is to study several types of pillow-lava rocks, there are four fundamental types of basic rooks: Ol -Basalt, Gabbro-Basalt, Gabbro-Basalt-Amphibole, and Gabbro-Dolerite.
- We test (50) thin rock sections, and about (150) rock samples, which taken from different zones in Al-Bassit area we do several studies, petrographic studies, and mineralogical, structure, texture, with polarizing microscope and reflective microscope.
-About (57) geochemical analyses have been done on the rock samples; they include all investigated rocks types. The analyses indicate that pillow-lava rocks are submarine magmatic flows, they have a basaltic composition, calc-alkaline series low potassium.
-They formed by the result two stages of crystallization; first stage inside of magma chamber, and the second, aqueous surface stage. The pillow-lava rocks were destructed in the latter stage on the continental's surface conditions.
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