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Register a new userAdvantages of Using Modern Thermodynamic Software in Geothermobarometry Modeling of Geological Processes Compared to the Conventional Methods, Thermocalc as example. Application on Geothermobarometry Modeling for Southern Syria Volcanism (Tal Al-Ashaer).
ميزات استخدام البرمجيات الترموديناميكية الحديثة في النمذجة الجيو ضغط-حرارية للعمليات الجيولوجية مقارنةً بالطرائق التقليدية، ثيرموكالك مثالاً. تطبيق على نمذجة جيو ضغط-حرارية في بركنة جنوب سورية (تل الأشاعر).
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Tishreen University ورقة بحثية
Publication date
2018
fields
Geology
and research's language is
العربية
Authors
بشار بغدادي( باحث )
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تناقش هذه الورقة برنامجاً حاسوبياً للنمذجة الجيو ضغط-حرارية يسمى ثيرموكالك و ذلك من خلال مثال تطبيقي على بركنة جنوب سورية و تحديداً بركان تل الأشاعر. تم إنشاء مخطط بياني بدلالة الضغط و الحرارة من أجل تركيب كيميائي محدد تم حسابه لمجموع من عينات لصخور البيريدوتيت الحامل للسبينيل مأخوذة من بركان تل الأشاعر. تمت مناقشة النتائج و تفسيرها، بالإضافة إلى مناقشة قيود و مآخذ هذه الطريقة. تم حساب التركيب الكيميائي المجمل بناءاً على التحاليل الفلزية من خلال ربطها بالكميات النسبية للمجموع الفلزي المدروس و بناءاً عليه تم عمل نموذج جيو ضغط-حراري باستخدام ثيرموكالك. يُظهر النموذج المنجز أن الشروط العامة التي يمكن للفلزات المتواجدة في الصخر البيريدوتيتي المدروس أن تتواجد مع بعضها البعض متوازنةً عندها تحدد حقلاً من الثباتية ضمن مجال من الحرارة من 700 إلى 1100 درجة مئوية يقابله مجال من الضغط بين 8 و 15 كيلوبار. تم حساب شروط الضغط و الحرارة الأكثر دقة و التي قد تشكل الصخر عندها من خلال استخدام واحدة من أدوات ثيرموكالك (إيزوبليت التراكيب) و تبين أن درجة الحرارة تساوي 982 درجة مئوية، و الضغط يساوي 10.5 كيلوبار. تمَّ تقدير العمق الموافق الذي تشكلت عنده العينات المدروسة بحوالي 36 كم، و توجد الحدود بين القشرة و المعطف العلوي في المنطقة المدروسة بالتالي عند ذلك العمق.
This paper discusses a geothermobarometry modeling computer software called Thermocalc through an applied example from the southern Syria volcanism, specifically from Tal Al-Ashaer volcano, is given. A graphical P-T diagram for a given chemical bulk composition of some spinel-bearing peridotite rocks (from Tal Al-Ashaer) is created. The results and their interpretation, in addition to limitations and constraints are discussed. Based on the mineralogical analysis linked to the studied mineral assemblage modes, the bulk-rock chemical composition is calculated and a geothermobarometry model using Thermocalc is made. The created model shows that the general conditions at which the rock-forming minerals (coexisting in equilibrium) define a field of stability with a range of temperature goes from 700 to 1100 C° corresponding a range of pressure between 8 and 15 Kbar. Using one of Thermocalc tools (composition isopleths) the most precise P-T conditions at which the rock was formed are estimated; T = 892 C° and P = 10.5 Kbar. The corresponding depth at which the studied samples were formed is about 36 Km. Accordingly, the crust-upper mantle boundary in the studied region is placed at that depth.
References used
BAGHDADI B., GODARD G., & JAMBON A. Evolution of the Angrite Parent Body: Implications of Metamorphic Coronas in NWA 3164. Meteoritics and Planetary Science, 2013, 48, 1873-1893
BAKER, J., HOLLAND, T. J. B., & POWELL, R. The Effect of Tschermak Solid Solutions on Assemblages in Aluminous Calc-Pelites. Contributions to Mineralogy and Petrology, 1994, 118, 48–59
BINA, C. R., & WOOD, B. J. Olivine-Spinel Transitions - Experimental and Thermodynamic Constraints and Implications fortThe 400-Km Seismic Discontinuity. Journal of geophysic Researches, 1987, 4, 853-866
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