کاربرد شیمی کانی‌ها در بررسی خاستگاه شکل‌گیری سنگ‌های دونیتی مجموعه اولترامافیک آب بید (شرق حاجی آباد، استان هرمزگان)

نویسندگان

دانشگاه شهید باهنر کرمان

چکیده

 مجموعه­ی اولترامافیک آب بید، واقع در شمال استان هرمزگان، جزئی از آمیزه­ی رنگین اسفندقه – حاجی آباد بوده و شامل هارزبورژیت، لرزولیت، دونیت، پیروکسنیت و کرومیت است. دونیت­ها یا به­صورت توده­های بزرگ و پیوسته دیده می­شوند و یا به شکل دایک­های دونیتی به درون هارزبورژیت­ها نفوذ کرده­اند. شواهد شیمی کانی­ها نشان دهنده دو خاستگاه متفاوت برای این دونیت­هاست. دونیت­های پیوسته همانند پریدوتیت­های دیرگداز گوشته­ای هستند، درحالی که دایک­های دونیتی، از بقایای کانال­های گوشته­ای تشکیل شده­اند که گدازه را به افق­های بالاتر هدایت کرده­اند. دایک­های دونیتی، محصول واکنش گدازه­ی بونینیتی وابسته به محیط بالای فرورانش با گوشته هارزبورژیتی بوده و از انواع دونیت­های جانشینی تشکیل شده­اند، ولی دونیت­های بزرگ و پیوسته، در اثر ذوب بخشی هارزبورژیت­ها در محیط بالای فرورانش ایجاد شده و دونیت پسمانده هستند.       

کلیدواژه‌ها


عنوان مقاله [English]

The use of mineral chemistry in the study of origin and evolution of dunitic rocks from Ab-Bid ultramafic complex (East Haji Abad, Hormozgan Province)

چکیده [English]

Ab-Bid ultramafic complex is a part of Esfandagheh-HadjiAbad coloured mélange at the north of Hormozgan Province. It contains harzburgite, lherzolite, dunites, pyroxenite and chromitite. Dunites occur either as large and continuous masses or as dykes which have been intruded into the harzburgites. Mineral chemistry evidences show that the origin of these two types of dunites are completely different. Continuous dunites are similar to the residual mantle peridotites, while, dunitic dykes are the remnants of mantle channels and conducted the melts toward the upper levels. Dunitic dykes are produced by reaction of suprasubduction zone related  to boninitic melts with the harzburgites and they are replacive dunites, but the large and continuous dunites have formed by partial melting of the harzburgites in a suprasubduction zone setting and so they are residual dunites.

کلیدواژه‌ها [English]

  • dunite
  • Esfandagheh
  • Hadji-Abad
  • Hormozgan
  • Ab-Bid ultramafic complex
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