بررسی سنگ‌نگاری، شیمی‌کانی‌ها و چگونگی تشکیل توده آمفیبول متاگابروی اسکاپولیتی، مجموعه دگرگونی بنه‌شورو، شرق ساغند، ایران مرکزی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه پیام نور، تهران، ایران

2 گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه تربیت مدرس، تهران، ایران

چکیده

توده آمفیبول متاگابروی مورد بررسی از معدود رخنمون‌های منطقه بوده که با وجود عملکرد فرایندهای دگرگونی، دگرشکلی‌های شکل‌پذیر و دگرنهادی بر مجموعه، آثاری از بافت آذرین اولیه را در خود حفظ کرده‌است. بافت این گروه سنگی، از بافت آذرین باقی‌مانده، تا بافت نواری جهت‌یافته در تغییر است. آمفیبول و پلاژیوکلاز ازکانی‌های اصلی و پیروکسن، کوارتز، فلوگوپیت، اسکاپولیت، کلسیت، تیتانیت و کانی‌های کدر، سایرکانی‌های تشکیل‌دهنده این توده هستند. بر اساس بررسی شیمی کانی، بلورهای آمفیبول موجود در زمینه و آمفیبول‌های واقع در لبه بلورهای کلینوپیروکسن اغلب ترکیب کلسیمی داشته و به ترتیب در مرز مشترک گستره آمفیبول‌های آذرین - آمفیبول‏های کلسیمی دگرگونی فشار پایین و آمفیبول‌های آذرین قرار دارند. ترکیب بلور پیروکسن، در گستره پیروکسن‌های آذرین و رده اوژیت سدیمی واقع هستند و بلورهای پلاژیوکلاز ترکیب اولیگوکلاز دارند. بررسی شیمی کانی در کنار بازدیدهای صحرایی نشان می‌دهد که تغییر از گابرو به آمفیبول متاگابروی اسکاپولیتی به احتمال بسیار طی فرایند آبدار شدن و آمفیبولی شدن توده گابرویی اولیه و مراحل مختلف جایگزینی کانی‌ها صورت گرفته‌است. 

کلیدواژه‌ها

عنوان مقاله [English]

Petrography, mineral chemistry and formation of scapolitic amphibole metagabbro, Boneh-Shoruw metamorphic complex, east of Saghand, Central Iran

نویسندگان [English]

  • Leila Maleki 1
  • Nematollah Rashidnezhad-e-Omran 2
1 Department of Geology, Faculty of Science, Payame Noor University (PNU), Tehran,Iran
2 Department of Geology, Faculty of Science, Tarbiat Modares University, Tehran, Iran
چکیده [English]

The studied amphibole metagabbro is one of the few lithologic units that, in spite of the metamorphic events, ductile deformations and metasomatism have preserved the primary magmatic texture in some locations .The texture is variable from relict igneous texture to foliated texture. Amphibole and plagioclase are the main minerals and pyroxene, quartz, phlogopite, scapolite, calcite, titanite and opaque minerals are the other constituents. Based on petrographic studies and mineral chemistry, calcic amphiboles of the matrix and amphiboles around the clinopyroxens belong to the boundary between low pressure metamorphic hornblende and unaltered igneous Ca- amphibole and magmatic amphibole, respectively. Pyroxene composition shows the magmatic affinity belongs to the sodic augite group. Plagioclase minerals are oligoclase in compositions. Field observations along with the mineral chemistry studies suggest that, the gabbro to scapolitic amphibole metagabbro probably have been enhanced by hydration and amphibolitization of original gabbro and replacement of former minerals.

کلیدواژه‌ها [English]

  • Central Iran
  • Saghand
  • amphibole metagabbro
  • amphibole
  • pyroxene

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  • تاریخ دریافت: 03 تیر 1403
  • تاریخ بازنگری: 17 مرداد 1403
  • تاریخ پذیرش: 12 شهریور 1403

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