دوره 28، شماره 3 - ( 7-1399 )
جلد 28 شماره 3 صفحات 696-685 |
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فاطمه یاری* 
1، محمدحسین زرین‌کوب1 ، سیدسعید محمدی1
1، محمدحسین زرین‌کوب1 ، سیدسعید محمدی1
1- دانشگاه بیرجند
چکیده: (1482 مشاهده)
منطقه مورد بررسی در 105 کیلومتری شرق سربیشه در استان خراسان جنوبی و در پهنه جوش خورده سیستان قرار دارد. سنگهای ماگمایی این منطقه بهصورت تودههای عمیق و نیمه عمیق شامل دیوریت، کوارتز دیوریت، کوارتز دیوریت پورفیری و دیوریت پورفیری با سن الیگو میوسن رخنمون دارند. این سنگها دارای بافتهای دانهای، پورفیری با زمینه ریزدانه، افیتیک، میان دانهای و گلومروپورفیری هستند. کانیهای سازنده سنگهای بررسی شده شامل پلاژیوکلاز، هورنبلند و کوارتز، بیوتیت، کلینوپیروکسن، آپاتیت، زیرکن و اسفن هستند. ماگمای سازنده این سنگها دارای ماهیت آهکی قلیایی پتاسیم پایین است. نمونهها غنی شدگی نسبی از عناصر خاکی نادر سبک و تهیشدگی از عناصر خاکی نادر سنگین را نشان میدهند. ناهنجاری منفی عناصر P ,Nb و Tiو ناهنجاری مثبت K و Cs در این نمونهها نشانگر تشابه آنها با فعالیت ماگمایی کمانهای آتشفشانی است. غنی شدگی در عناصر سنگ دوست بزرگ یون نسبت به عناصر با شدت میدان بالا نشان دهنده ماگمای وابسته به مناطق فرورانش است.
فهرست منابع
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