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Damchin mashak S, Torkian A, Furman T. Mineral chemistry and P-T estimation of coexisting minerals in the andesitic rocks from the N-Saqqez, NW Iran. www.ijcm.ir 2024; 32 (2) :339-358
URL: http://ijcm.ir/article-1-1915-fa.html
URL: http://ijcm.ir/article-1-1915-fa.html
دامچین مشاک سارا، ترکیان اشرف، فورمن تانیا. شیمی‌کانی و دما-فشار کانی‌های همزیست در سنگ‌های آندزیتی شمال سقز، شمال غرب ایران. مجله بلورشناسی و کانی شناسی ایران. 1403; 32 (2) :339-358
سارا دامچین مشاک1 
، اشرف ترکیان* 1، تانیا فورمن2
، اشرف ترکیان* 1، تانیا فورمن2
1- گروه زمین شناسی، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان، ایران
2- گروه علوم زمین، دانشگاه ایالتی پنسیلوانیا، دانشگاه پارک، پ.ا. 16802، امریکا
2- گروه علوم زمین، دانشگاه ایالتی پنسیلوانیا، دانشگاه پارک، پ.ا. 16802، امریکا
چکیده: (618 مشاهده)
منطقه سقز در شمال غرب ایران، در شمال پهنه سنندج - سیرجان و استان کردستان قرار دارد. سنگ‌های آندزیتی و آندزیت بازالتی آن از کانی‌های آمفیبول، پلاژیوکلاز، کلینوپیروکسن و ارتوپیروکسن تشکیل شدهاند. ترکیب آمفیبول‌ها از منیزیو-هستینگزیت، منیزیو-هورنبلند تا چرماکیت–پارگازیت متفاوت است. ترکیب پیروکسن‌ها اوژیت- 39.33 En40.37-40.26 Fs20.49-13.89 Wo45.39 و انستاتیت En59.863-71.04Fs26.083-36.850Wo 2.842-3.287است. مقدار آنورتیت پلاژیوکلازها از 23/39 تا 70/68 درصد نوسان دارد و ترکیب آنها بین آندزین تا لابرادوریت متغیر است. براساس دما و فشارسنجی بر پایه آلومینیوم در شبکه آمفیبول‌ها، دما و فشار تبلور °C 895-961 و kbar11/2 – 59/4 بوده است. بر اساس مقدار Ti، دمای °C 800 تا 950 بدست آمده است. بررسی شیمی کانی کلینوپیروکسن نشان می‌دهد که انواع سنگ‌های آتشفشانی مورد بررسی در دمای 1100 تا 1250 درجه سانتی‌گراد و فشار 2 تا 10 کیلوبار متبلور شدهاند. همچنین مقدار AlIV و Si بیانگر تبلور آمفیبول‌ها در فشارهای پایین است که با مقدار AlIV/AlVI در پیروکسن‌های کم فشار تا فشار متوسط این پژوهش همخوانی دارد. افزون بر این، بررسی مقدار کاتیون‌های AlVI+2Ti+Cr و Na+AlIV در شبکه پیروکسن‌ها و مقادیر LogƒO2 و Fe# در شبکه آمفیبول‌ها چنین برداشت می‌گردد که آنها در شرایط فشاربخشی بالا متبلور شدهاند.
واژه‌های کلیدی: پلاژیوکلاز، آمفیبول، پیروکسن، دما- فشارسنجی، فشاربخشی اکسیژن.
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