بررسی محیط زمین‌ شناسی سیلیس‌ های منطقه دهنو- عبید (شمال شرقی عشق‌ آباد) با استفاده از مطالعات شاره‌ های درگیر

زمین شناسی اقتصادی

مقاله 10، دوره 8، شماره 2 - شماره پیاپی 15، بهمن 1395، صفحه 457-472   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v8i2.43673

نویسندگان

امید یزدان پناه؛ علی اکبر حسن نژاد^*

دامغان

چکیده

منطقه دهنو- عبید در فاصله 20 کیلومتری شمال شرق شهر عشق‌آباد در بلوک طبس و در قسمت شرقی زون ساختاری ایران مرکزی واقع شده است. لیتولوژی غالب در محدوده مورد بررسی شامل شیل‌های تیره رنگ و ماسه سنگهای ریزدانه‌ و درشت‌دانه‌ی آرکوزی و لیتیک آرکوز است که تا اندازه‌ای دگرگونی درجه پایین را نشان می‌دهند. در این منطقه، کانی‌سازی سیلیس به‌صورت رگه‌ای، رگه‌چه‌ای و در قسمتهایی به‌صورت عدسیهای بزرگ سیلیسی رخ داده است. بررسی ریز دماسنجی شاره‌های درگیر در کانی کوارتز نشان می‌دهد که دمای همگن‌شدگی بین 247 تا 336 درجه سانتی‌گراد و درجه شوری از 9/0 تا 8/15 درصد وزنی معادل نمک طعام و چگالی سیال کانی‌ساز بین 7/0 تا 9/0 گرم بر سانتی‌متر مکعب در تغییر است. با توجه به شواهد به‌دست آمده از بررسیهای صحرایی و آزمایشگاهی، از جمله بررسی ریز دماسنجی و همچنین حضور فاز کربنیک در شاره‌های درگیر، احتمالاً سیلیس‌های منطقه زیر شرایط دگرگونی تشکیل شده‌اند.

کلیدواژه‌ها

سیلیس؛ شاره‌ های درگیر؛ فاز کربنیک؛ دگرگونی؛ دهنو- عبید

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