سنگ‌شناسی و شیمی کانی پریدوتیت‌های سرپانتینی شده جنوب بوانات (استان فارس)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه لرستان، خرم آباد ، ایران

2 گروه زمین‌شناسی، دانشگاه آزاد اسلامی واحد شیراز، شیراز، ایران

چکیده

منطقه مورد بررسی در پهنه زاگرس مرتفع قرار دارد و بخشی از افیولیت نی‌ریز محسوب می‌شود. در این منطقه، مجموعه افیولیتی به صورت آمیزه رنگین کوچک شامل چرت‌های رادیولاریتی و سنگ‌های پریدوتیتی سرپانتینی شده است. سنگ‌های پریدوتیتی اغلب از نوع هارزبورژیت به شدت سرپانتینی شده هستند. این سنگ‌ها دارای الیوین، پیروکسن، سرپانتین و اسپینل هستند که الیوین‌ها به شدت به سرپانتین و پیروکسن‌ها به بستیت تبدیل شده‌اند. از این رو، کانی‌های گروه سرپانتین بسیار در این سنگ‌ها دیده می‌شوند. اسپینل نیز به صورت بی‌شکل و آمیبی در این سنگ‌ها یافت می‌شود. بر اساس شیمی کانی، سرپانتین‌ها در گستره پایداری هر سه فاز کانیایی لیزاردیت، کریزوتیل و آنتیگوریت و در گستره سرپانتینیت‌های شبه ریخت قرار دارند و از این رو برآمده از جایگزینی پسرونده الیوین و پیروکسن با سرپانتین‌ها هستند. همچنین این کانی‌ها بیشتر در گستره‌های شبکه الیوین (Ol-mesh) و بستیت کلینوپیروکسن واقع بوده و از این رو ناشی از دگرگونی پسرونده سنگ‌های هارزبورژیتی و دونیتی هستند. اسپینل‌ها از نوع کروم اسپینل هستند و در گستره پلوناست قرار دارند. این کروم اسپینل‌ها از نوع افیولیتی بوده و دارای ماهیت پسماندی هستند. مقادیر پایین TiO2 و غنی‌شدگی این اسپینل‌ها از Cr شبیه اسپینل در هارزبورژیت‌های جلو قوس است. همچنین این اسپینل‌ها، افزون بر داشتن مشخصه پریدوتیت‌های آلپی، در گستره همپوشی پریدوتیت‌های فرافرورانش با آبیسال نیز قرار می‌گیرند. بنابراین، پریدوتیت­های سرپانتینی شده مورد بررسی از درجه­های بالای ذوب بخشی (30-25 درصدی) یک گوشته تهی شده و زیر اقیانوسی در یک محیط فرافرورانش - جلو قوس تشکیل شده‌اند.     

کلیدواژه‌ها

عنوان مقاله [English]

Petrology and mineral chemistry of serpentinized peridotites in the south of Bavanat (Fars Province)

نویسندگان [English]

  • Maryam Zurmand Sangari 1
  • Ahmad Ahmadi Khalaji 1
  • Kamal Noori Khankahdani 2
  • Zahra Tahmasbi 1
1 Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran
2 Department of Geology, Shiraz Branch, Islamic Azad University, Shiraz, Iran
چکیده [English]

The studied area is located in the high Zagros zone and it is considered a part of the Neyriz ophiolite. In this area, the ophiolitic complex is a small coloured melange including radiolarite cherts and serpentinized peridotite rocks. The peridotite rocks are mostly serpentinized harzburgite. The peridotite rocks are mostly serpentinized harzburgite. These rocks composed mainly of olivine, pyroxene, serpentine and spinel, where olivines have been strongly altered to serpentine and pyroxenes to bastite. So, serpentine group minerals are seen in abundance in these rocks. Also, spinel is found in amorphous and amoebic shape in these rocks. Based on mineral chemistry, serpentines are in the range of stability of all three mineral phases, i.e. lizardite, chrysotile and antigorite, and the range of pseudomorphic serpentinites, which shows they are the result of the regressive replacement of olivine and pyroxene with serpentines. Also, these minerals are mostly located in Ol-mesh and Cpx bastite ranges, which shows they are the result of regressive metamorphism of harzburgite and dunite rocks. The spinels are Cr- spinel and pleonaste type. These Cr spinels are ophiolitic type and have residual nature. The low TiO2 and the enrichment of these spinels from Cr is similar to spinel in fore-arc harzburgites. Also, these spinels, in addition to having the characteristics of alpine peridotites, are placed in the overlapping range between suprasubduction (SSZ) and abyssal peridotites. So, the studied serpentinized peridotites are formed from high degrees of partial melting (25-30%) of a depleted mantle in a suprasubduction (SSZ) - fore-arc setting.

کلیدواژه‌ها [English]

  • High Zagros
  • Bavanat
  • ophiolite
  • serpentinized peridotites
  • serpentine
  • spinel

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  • تاریخ دریافت: 26 دی 1401
  • تاریخ بازنگری: 26 بهمن 1401
  • تاریخ پذیرش: 02 اسفند 1401

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