دوره 28، شماره 4 - ( 10-1399 )
جلد 28 شماره 4 صفحات 962-949 |
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Ebrahimnejad, Arvin, Dargahi, Nakashima. The mineral chemistry and geothermobarometry of gabbroic rocks crystallization of Dehsard area (Southeast of Iran). www.ijcm.ir 2020; 28 (4) :949-962
URL: http://ijcm.ir/article-1-1560-fa.html
URL: http://ijcm.ir/article-1-1560-fa.html
ابراهیم‌نژاد مهدی، آروین محسن، درگاهی سارا، ناکاشیما کازو. شیمی کانی و زمین دما فشار سنجی تبلور سنگهای گابرویی منطقه دهسرد
(جنوب‌شرق ایران). مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (4) :949-962
مهدی ابراهیم‌نژاد* 
1، محسن آروین2 ، سارا درگاهی2 ، کازو ناکاشیما3
1، محسن آروین2 ، سارا درگاهی2 ، کازو ناکاشیما3
1- دانشگاه پیام نور کرمان
2- دانشگاه شهید باهنر
3- دانشگاه یاماگاتا
2- دانشگاه شهید باهنر
3- دانشگاه یاماگاتا
چکیده: (1211 مشاهده)
توده گابرویی منطقه دهسرد به سن تریاس پسین در جنوبغرب کرمان و جنوبیترین بخش پهنه سنندج- سیرجان قرار دارد. براساس پیمایشهای صحرایی و بررسیهای سنگ نگاری، این توده مافیکی از نوع هورنبلندگابرو است. توده گابرویی مورد بررسی شامل کانیهای پلاژیوکلاز، کلینوپیروکسن، آمفیبول، تیتانیت، آپاتیت، اپیدوت و کلریت است. بررسی شیمی کانیها نشان میدهد که ترکیب پلاژیوکلازها از نوع آلبیت تا الیگوکلاز است و کلینوپیروکسنها از نوع دیوپسید هستند. کلینوپیروکسنهای مورد بررسی در گستره کلسیم، منیزیم و آهندار واقع هستند. آمفیبولها در گروه آمفیبولهای کلسیمدار و از نوع مگنزیوهورنبلند و اکتینولیت هستند. بررسی زمیندماسنجی کلینوپیروکسن و آمفیبول گابروها دمای 1000 تا 1200 درجه سانتیگراد را برای تبلور این سنگها تعیین میکند. زمینفشار سنجی بر اساس کانی کلینوپیروکسن، فشار تبلور سنگهای گابرویی مورد بررسی را در گستره 58/5-05/2 کیلوبار معادل عمق میانگین 14 کیلومتر تعیین میکند. ترکیب شیمیایی کانیهای کلینوپیروکسن و آمفیبولها نشاندهنده تبلور آنها از ماگمایی نیمه قلیایی- آهکی قلیایی است. محیط پیدایش این ماگماها کمان آتشفشانی وابسته به محیط فرورانش است.
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