بررسی کانی سازی اسکارن مزرعه، شمال اهر، با تاکید بر مطالعه میانبارهای شاری

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه شهید بهشتی

چکیده

کانسار اسکارن مزرعه در کمربند فلززایی قفقاز کوچک – البرز غربی بر اثر تزریق توده گرانیتوییدی شیورداغ به سن اولیگومیوسن به درون مجموعه کربناته، آتشفشانی قدیمی­تر و به شکل برون اسکارن گارنت ـ اپیدوت­دار ایجاد شده است. ترکیب کانی­شناسی فلزی شامل مگنتیت، پیریت، کالکوپیریت، بورنیت، کوولیت، هماتیت، گوتیت و مالاکیت است و بیشتر کانه­زایی در مرحله اسکارن پسرونده ایجاد شده است. نتایج تجزیه عناصر فرعی نشانگر تاثیر شاره­های با خاستگاه پوسته بر توده نفوذی طی فرآیندهای اسکارن­زایی است. در کانی­های کوارتز و کلسیت نمونه­های اسکارن دو دسته شاره درگیر نوع (L+V) با شوری کم تا متوسط (57/1 تا 94/17درصد وزنی نمک) و گستره دمای همگن­شدگی 120 تا 356 درجه و نوع (L+V+S)  با شوری زیاد (06/32 تا 77/41 درصد وزنی نمک) و گستره دمای همگن­شدگی 227 تا 375 درجه سانتی­گراد دیده می­شوند که هر دو در مرحله اسکارن پسرونده ایجاد شده­اند. خاستگاه میانبارهای شاره­ای نوع(L+V)  و نوع (L+V+S) به ترتیب شاره­های دگرگونی و ترکیب ماگمایی – شورابه­های سطحی هستند. دو فرآیند آمیختگی هم­دمای شاره­های با شوری مختلف و رقیق­شدگی سطحی شاره­ها بر اثر مخلوط شدن آب­های جوی با شاره­های ماگمایی- دگرگونی عوامل اصلی تکوین شاره­های کانه­ساز هستند. فشار شاره در زمان تشکیل کانسنگ در حدود 100 بار و دمای تقریبی بین 250 تا 340 درجه سانتی­گراد بوده است و بر این اساس می­توان کانسار اسکارن مزرعه را با ژرفای تشکیل 350 تا 400 متر نسبت به سطح ایستابی قدیمی، به عنوان یک کانسار اسکارن کم ژرفا معرفی کرد.    

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of Mazraeh Skarn mineralization, North of Ahar, with an emphasis on fluid inclusion studies

نویسندگان [English]

  • Gharesi
  • Rasa
  • Yazdi
چکیده [English]

The emplacement of Oligo-Miocene age Sheyvardagh intrusive body within the older carbonate and volcanoclastic rocks is responsible for contact metamorphism and creating of Mazraeh deposit in epidote - garnet exoskarn of Western Alborz- lesser Caucasus metallogenic belt. Mineralogical paragenesis consist of magnetite, pyrite, chalcopyrite, bornite, covellite, hematite, goethite and malachite and main mineralization stage occurs in retrograde skarn phase. Trace element analysis show the effects of meteoric fluids on intrusive body during the Skarnification .Two types of fluid inclusions were identified in quartz and calcite minerals of retrograde skarn stage. (L+V) type is recognize with low-medium salinity and low homogenization temperature range (120-356°) and (L+V+S( type is identified in high salinity and slightly higher homogenization temperature range (227-375°). Both of inclusion types entrapped in retrograde skarn stage. (L+V) inclusions originated from metamorphic fluids and (L+V+S (inclusions originated from magmatic – meteoric mixing fluids. Isothermal minxing and surface fluid dilution are main evolution factors in mineralization fluids. Microthermometric values in ore formation stage are conformable with pressure (100 bar) and depth figures (350 - 400 meters). Mazraeh skarn deposit is characterized as an shallow skarn.

کلیدواژه‌ها [English]

  • Western Alborz- lesser Caucasus metallogenic belt
  • Mazraeh deposit
  • Skarn
  • fluid inclusions
  • microthermometry

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مجله بلورشناسی و کانی شناسی ایران
دوره 26، شماره 1 - شماره پیاپی 69
فروردین 1397
صفحه 229-244

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  • تاریخ دریافت: 27 فروردین 1396
  • تاریخ بازنگری: 08 تیر 1396
  • تاریخ پذیرش: 18 مرداد 1396

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