زمین دما-فشارسنجی سنگ های گابروئیدی میزبان کانه زایی اکسیدی آهن– تیتانیوم در منطقه درگز (کمپلکس افیولیتی کهنوج)

زمین شناسی اقتصادی

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 28 آذر 1400  

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2021.69934.1016

نویسندگان

مجید قاسمی سیانی؛ حامد ابراهیمی فرد

گروه زمین‌شیمی، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

چکیده

سنگ­های گابروئیدی منطقۀ درگز با طیف سنگ­ شناسی فروگابرو تا پیروکسن-هورنبلند گابروی ­درشت ­بلور، پیروکسن- هورنبلند گابرو ریز­بلور و هورنبلند گابرو واقع در کمپلکس افیولیتی کهنوج، میزبان کانه ­زایی اکسید آهن- تیتانیوم هستند. اولیوین­ها ترکیب کریزولیت تا هیالوسیدریت دارند. ارتوپیروکسن­ها و کلینوپیروکسن­های بررسی­شده، از نوع انستاتیت و اوژیت دیوپسیدی تا دیوپسید اوژیتی است. آمفیبول­های سنگ­های گابروئیدی و دایک­های دیابازی با ترکیب هورنبلند گابرو، منیزیم بالایی داشته و از نوع کلسیک بوده و عمدتاً از نوع پارگازیت، منیزیوهاستینگزیت و منیزیوهورنبلند هستند. ترکیب پلاژیوکلازها از بیتونیت در فروگابرو و پیروکسن – هورنبلند گابرو تا آندزین در هورنبلند گابرو و دایک­های دیابازی متغیر است. مطالعات زمین­دما-فشار­سنجی برپایۀ ترکیب کلینوپیروکسن­ها و آمفیبول­ها، دماهای 750 تا 1258 (زمین­دماسنج پیروکسن) و 776 تا 884 درجۀ سانتی­گراد (زمین ­دماسنج پلاژیوکلاز و پلاژیوکلاز – هورنبلند) را به ترتیب در فشار­های 5/2 و 6 کیلوبار برای سنگ­های گابروئیدی نشان داد. با استفاده از این دماسنجی­ ها، دماهای 700 تا 1145 (زمین­دماسنج پیروکسن) و 911 تا 948 درجۀ سانتی­گراد (زمین­دماسنج پلاژیوکلاز – هورنبلند و هورنبلند) به ترتیب در فشارهای 5/2 و 6 کیلوبار برای دایک­های دیابازی تخمین زده شد. نتایج حاصل از زمین­دما-فشارسنجی سنگ­های گابروئیدی و دایک­های دیابازی میزبان کانه­ زایی اکسیدی آهن – تیتانیوم منطقۀ درگز، با ژرفای جایگیری و تبلور ماگما (34/15 تا 20/21 کیلومتری)، در بخش فوقانی گوشتۀ بالایی مطابقت دارد. مقادیر دما و فوگاسیتۀ بالای اکسیژن به دست آمده برای سنگ­های گابروئیدی، نشان­دهندۀ شرایط اکسیدان در پیدایش این سنگ­ها به همراه کانه ­زایی همزادی (ارتوماگمایی) اکسید آهن- تیتانیوم در حین سرد­شدن و تفریق ماگما و شکل­گیری این توده ­ها در یک حوضه کششی پشت کمانی است.

کلیدواژه‌ها

شیمی کانی؛ زمین دما- فشارسنجی؛ سنگ های گابروئیدی؛ اکسید آهن – تیتانیوم؛ درگز؛ کمپلکس افیولیتی کهنوج

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