بررسی سنگ‌‌نگاری، شیمی‌کانی و زمین دما فشارسنجی آمفیبولیت‌های معدن گل‌گهر سیرجان، استان کرمان

نوع مقاله : مقاله پژوهشی

نویسندگان

بخش زمین‌شناسی، دانشگاه شهید باهنر کرمان، کرمان، ایران

چکیده

معدن سنگ آهن گل‏گهر، در جنوب‏غربی شهرستان سیرجان، از دیدگاه ساختاری در پهنه ساختاری سنندج-سیرجان قرار دارد و بیشتر آن از سنگ‏های دگرگونه پالئوزوئیک تشکیل شده است. بالاترین درجه دگرگونی سنگ­های منطقه مربوط به رخساره آمفیبولیت است. آمفیبولیت­های منطقه آشکارا به دو نوع آمفیبولیت و بیوتیت آمفیبولیت تقسیم می­شوند که شامل کانی‏های اصلی هورنبلند و پلاژیوکلاز همراه با کانی‏های فرعی بیوتیت، اسفن، کوارتز، تورمالین و کانی‏های کدر هستند. در بعضی از نمونه­ها، بیوتیت نیز به عنوان کانی اصلی یافت شد. کانی‏های ثانویه کلریت، اپیدوت، کلسیت، اکسیدهای آهن و سریسیت به عنوان فازهای برآمده از دگرسانی و همچنین کلریتی و اپیدوتی شدن بیوتیت‏ها و آمفیبول‏ها به عنوان شواهدی از دگرگونی پسرونده در حد رخساره اپیدوت آمفیبولیت گسترش یافته‏اند. بافت آمفیبولیت­های منطقه اغلب دانه شکفتی است. براساس داده­های شیمی‏کانی آمفیبول،‏ نمونه‏های مورد بررسی در دو گروه کلسیمی، با ترکیب مگنزیوهورنبلند و پاراگاسیت و سدیمی-کلسیمی با ترکیب وینچیت قرار می­گیرند. باتوجه به نتایج دما-فشار سنجی، آمفیبول‏ها در شرایط گریزندگی اکسیژن بالا و در دمای 600 تا 750 درجه سانتیگراد و فشار تقریبی 3 تا 7 کیلوبار تشکیل شده‏اند.

کلیدواژه‌ها

عنوان مقاله [English]

Petrography, mineral chemistry and geothermobarometry of amphibolits in Gol-e-Gohar area (Sirjan), Kerman Province

نویسندگان [English]

  • Ghafouri
  • Moeinzadeh
Department of Geology, Shahid Bahonar University of Kerman, Kerman, Iran
چکیده [English]

The Gol-e- Gohar iron ore mine, in southwest of Sirjan city, is structurally located in the Sanandaj-Sirjan zone and is mostly composed of Paleozoic metamorphic rocks. The highest degree of metamorphism of the rocks of the region is related to the amphibolite facies. The studied of amphibolite indicates that the hornblende and plagioclase are the main and biotite, sphene, quartz, tourmaline and opaque minerals are the accessory minerals. Secondary minerals include chlorite, epidote, calcite, iron oxides, and sericite that have been developed during the alteration phases, as well as chloritization and epidotization of biotites and amphiboles as evidence of retrograde metamorphism. Based on amphibole mineral chemistry studies, amphiboles are formed as a combinations of magnesio hornblende, paragasite and winchite types. According to Geothermobarometry studies, amphiboles are formed under conditions of high oxygen fugacity and at a temperature of 600 to 750° and an approximate pressure of 3 to 7 kbar.

کلیدواژه‌ها [English]

  • Sirjan
  • Gol-e-Gohar
  • amphibolite
  • Mineral chemistry
  • geothermobarometry

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سابقه مقاله

  • تاریخ دریافت: 23 آبان 1401
  • تاریخ بازنگری: 12 دی 1401
  • تاریخ پذیرش: 15 بهمن 1401

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