دوره 31، شماره 2 - ( 3-1402 )
جلد 31 شماره 2 صفحات 318-305 |
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Torabi G, Salim H, Shirdashtzadeh N. Mineralogy of the Lower Oligocene alkali basalts and their sillimanitite xenoliths (SW of Jandaq, Isfahan Province, Central Iran). www.ijcm.ir 2023; 31 (2) :305-318
URL: http://ijcm.ir/article-1-1777-fa.html
URL: http://ijcm.ir/article-1-1777-fa.html
ترابی قدرت، سلیم حنان، شیردشت زاده نرگس. کانی‌‌شناسی بازالتهای قلیایی الیگوسن و بیگانه سنگهای سیلیمانیتیت موجود در آنها (جنوب غرب جندق، استان اصفهان، ایران مرکزی). مجله بلورشناسی و کانی شناسی ایران. 1402; 31 (2) :305-318
قدرت ترابی* 
1، حنان سلیم1 ، نرگس شیردشت زاده2
1، حنان سلیم1 ، نرگس شیردشت زاده2
1- گروه زمین‌شناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران
2- بخش زمین شناسی، دانشکده علوم پایه، دانشگاه تربیت مدرس، تهران، ایران
2- بخش زمین شناسی، دانشکده علوم پایه، دانشگاه تربیت مدرس، تهران، ایران
چکیده: (947 مشاهده)
رخنمون بازالتهای قلیایی الیگوسن پیشین در راستای گسل تویره، در شمال‌غربی خردقاره شرق - ایران مرکزی، از نظر سنگنگاری و شیمیکانی‌ها بررسی شد. این بازالتهای قلیایی از درشت بلورهای کریزولیت (90- 70Fo)، اوژیت-دیوپسید (82/0Mg#=) و لابرادوریت (70-30An) در زمینهای شامل بلورهای ریز همین کانی‌ها افزون بر سانیدین و کانی‌های ثانویه (سرپانتین، زئولیت) و کانی‌های کدر تشکیل شده‌اند. همچنین، این سنگ‌ها دارای بیگانه سنگهای سیلیمانیتیت هستند که از کانی اصلی سیلیمانیت فیبرولیتی و منشوری، کانی فرعی کروندوم و کانی‌های ثانویه (کلریت و اسکاپولیت) تشکیل شده‌اند و بافتهای دانه شکفتی، نخ شکفتی، غربالی و تاجخروسی نشان می‌دهند. این بیگانه سنگهای غنی از آلومینیم و دارای سیلیس متوسط به احتمال بسیار فراورده دگرگونی سنگهای رسوبی پوسته قاره‌ای هستند و با ماگمای بازالتی قلیایی سریع به سطح زمین آورده شده‌اند. تشکیل فیبرولیت پیرامون برخی سیلیمانیت‌های منشوری و تشکیل اسپینل‌های غنی از آلومینیم (4/0-5/0Mg#=) در مرز بیگانه سنگ با بازالت میزبان گویای کاهش دما و فشار طی صعود و واکنش مذاب بازالتی با بیگانه سنگ هستند.
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