سامانه مدیریت نشریات علمی دانشگاه دامغان

آلیانی, فرهاد, دارایی‌زاده, زینب. (1397). نخستین گزارش از وجود کانی‌های فشار بالا در مجموعه افیولیتی کرمانشاه تأییدی بر فرورانش پوسته اقیانوسی نئوتتیس. مجله زمین شیمی ایران, 26(2), 315-326. doi: 10.29252/ijcm.26.2.315
فرهاد آلیانی; زینب دارایی‌زاده. "نخستین گزارش از وجود کانی‌های فشار بالا در مجموعه افیولیتی کرمانشاه تأییدی بر فرورانش پوسته اقیانوسی نئوتتیس". مجله زمین شیمی ایران, 26, 2, 1397, 315-326. doi: 10.29252/ijcm.26.2.315
آلیانی, فرهاد, دارایی‌زاده, زینب. (1397). 'نخستین گزارش از وجود کانی‌های فشار بالا در مجموعه افیولیتی کرمانشاه تأییدی بر فرورانش پوسته اقیانوسی نئوتتیس', مجله زمین شیمی ایران, 26(2), pp. 315-326. doi: 10.29252/ijcm.26.2.315
آلیانی, فرهاد, دارایی‌زاده, زینب. نخستین گزارش از وجود کانی‌های فشار بالا در مجموعه افیولیتی کرمانشاه تأییدی بر فرورانش پوسته اقیانوسی نئوتتیس. مجله زمین شیمی ایران, 1397; 26(2): 315-326. doi: 10.29252/ijcm.26.2.315

نخستین گزارش از وجود کانی‌های فشار بالا در مجموعه افیولیتی کرمانشاه تأییدی بر فرورانش پوسته اقیانوسی نئوتتیس

مجله بلورشناسی و کانی شناسی ایران
مقاله 5، دوره 26، شماره 2 - شماره پیاپی 72، تیر 1397، صفحه 315-326    اصل مقاله (3.76 M)
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.29252/ijcm.26.2.315
نویسندگان
فرهاد آلیانی؛ زینب دارایی‌زاده*
دانشگاه بوعلی‌سینا
چکیده
مجموعه افیولیتی کرمانشاه در پهنه ساختمانی ـ زمین­ساختی غرب ایران در بخش شمالی روراندگی اصلی زاگرس قرار دارد و بخشی از کمربند افیولیتی بشدت گسیخته کرمانشاه ـ پنجوین محسوب می­شود. وجود پهنه چند دگرگونه در منطقه در اصل به توسعه افیولیت­ها و جایگیری زمین­ساختی آنها وابسته است. برخی از سنگ­های دگرگونی موجود در منطقه (یشم و بدل یشم) دارای سختی، وزن مخصوص و تراکم بالا بوده و شامل کانی­هایی چون ترمولیت، اکتینولیت، پلاژیوکلاز، کلینوکلر و گارنت گروسولار هستند. سنگ­های دگرگونی دربردارنده ترمولیت بسیار متراکم و نفریت موجود در منطقه و نیز سرپانتینیت­های آنتی­گوریتی بسیار متراکم موسوم به باونیت، گواهی روشن بر رخداد پدیده فرورانش و رخداد دگرگونی فشار بالا در منطقه هستند. سرپانتینیت­های منطقه با مقدار آنتی­گوریت و کروم مگنتیت بسیار بالا و نیز افت گرمایی (LOI) نسبتاً کم (1/12-9/10 درصد وزنی) با دگرگونی رخساره شیست آبی دما متوسط تا بالا مشخص می­شوند. این شرایط دگرگونی برآمده از سرپانتی­شدن پروتولیت­های هارزبورژیتی به­شدت تهی شده­ای است که در اثر ذوب­بخشی گسترده (بیش از 15 درصد، مطابق با محیط فرورانشی آبدار) رخ داده­اند. گابروها در مجموعه افیولیتی دچار دگرسانی نوع رودنژیتی شده­اند، این گابروهای رودنژیتی، در ادامه یک فرایند رودنژیت­زدایی را نیز پشت سر گذارده­اند.    
کلیدواژه‌ها
نفریت؛ یشم؛ بدل یشم؛ سرپانتینیت؛ باونیت؛ دگرگونی فشار بالا؛ فرورانش؛ افیولیت کرمانشاه
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