یافته‌های نوین زمین‌شناسی کاربردی

یافته‌های نوین زمین‌شناسی کاربردی

فشار و دماسنجی سنگ‌های ماگمایی چلوان با استفاده از کانی‌های آمفیبول، بیوتیت، پلاژیوکلاز، پیروکسن، شمال شهرکرد، پهنه سنندج- سیرجان

نویسنده
استادیار گروه زمین‌شناسی، دانشگاه پیام‌نور، تهران، ایران
چکیده
منطقه مورد مطالعه در 45 کیلومتری شمال شهرکرد و در نزدیکی روستای چلوان در بخش میانی پهنه ‌ساختاری سنندج- سیرجان واقع‌ شده است. ستون چینه‌شناسی منطقه عبارت‌اند از: کربناته‌های کرتاسه، شیل‌ها و ماسه‌سنگ‌های ژوراسیک، و سنگ‌های ولکانیک. مطالعات پتروگرافی سنگ‌های ‌ولکانیکی ‌دال بر حضور سنگ‌های آذرین تیپ آندزیت، آندزیتیک‌بازالت و بازالت با کانی‌های اصلی الیوین، پیروکسن، پلاژیوکلاز و آمفیبول، همراه با بیوتیت و کانی‌های فرعی اسفن، آپاتیت و کدر که دارای بافت غالب میکرولیتیک پورفیری و پورفیری هستند. نتایج آنالیز شیـــمی فنوکریست‌های پیروکسن شاهدی بر حضور پیروکـسن‌های نـوع اوژیـت با طیف ترکیـب شیــمیایی Fs 12.52-17.38 En 42.71 Wo 36.92 – 39.67 است که در طیف دمای 1200 تا 1300درجه سانتی‌گراد و گستره فشار 6 تا 10 کیلوبار تشکیل شده‌اند. آمفیبول‎ها چلوان از نوع منیزیوهورنبلندهای هستند که در فشار 7/2 تا 5 کیلوبار و دمای 720 تا 800 درجه سانتی­گراد تبلور یافته‌اند میکاهای این منطقه از نوع منیزیو بیوتیت‌های اولیه ماگمایی هستند که در دمایی580 تا 680 درجه سانتی­گراد تشکیل شده‌اند. ترکیب پلاژیوکلازها از اولیگوکلاز تا لابرادوریت در نوسان بوده و شاهدی بر دمای تبلور 700 تا800 درجه سانتی‌گراد هستند. تلفیق داده‌های آنالیز شیمی کانی‌ها سنگ‌های آذرین چلوان به موقعیت تکتونیکی ماگمای کالکوآلکالن اشاره دارد که در یک زون در حال فرورانش تشکیل شده‌اند.
کلیدواژه‌ها

عنوان مقاله English

Thermobarometry Chelvan igneous rocks using amphibole, biotite, plagioclase, pyroxene minerals, north of Shahrekord, Sanandaj-Sirjan zone

نویسنده English

M. Ahankoub
Assist. Prof., Dept., of Geology, Payame Noor University, Tehran, Iran
چکیده English

The area is in 45 kilometers north of Shahrekord and near the city of Chelvan in the middle part of the Sanandaj-Sirjan structural zone. The stratigraphic column of the area consists of: Cretaceous carbonates, Jurassic shales and sandstones, and volcanic rocks. The petrographic observation of volcanic rocks indicate the presence of igneous rocks of the andesite, andesite-basalt and basalt types with the main minerals olivine, pyroxene, plagioclase and amphibole, along with biotite and minor and opaque minerals that have a dominant microlitic porphyry and porphyry texture. The results of the chemical analysis of pyroxene phenocrysts indicate the presence of augite-type pyroxenes with a chemical composition spectrum of Fs 12.52-17.38 En 42.71-Wo 36.92-39.67, which were formed in the temperature range of 1200 to 1300 degrees Celsius and a pressure range of 6 to 10 kilobars. The amphiboles are magnesian-hornblende type that crystallized at a pressure of 2.7 to 5 kilobars and a temperature of 720 to 800 degrees Celsius. The micas of this area are primary magmatic magnesian biotites that were formed at a temperature of 580 to 680 degrees Celsius, and the composition of plagioclases fluctuates from oligoclase to labradorite, indicating the crystallization temperature 700-800 degrees Celsius. The combination of mineral chemical analysis data of the Chelwan igneous rocks indicates the tectonic setting of calc-alkaline magmas that formed in a subduction zone.

کلیدواژه‌ها English

Biotite
Pyroxene
Amphibole
Plagioclase
Chelvan
Sanandaj-Sirjan Zone
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