نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

سنگ نگاری، شیمی کانی و تحولات پتروژنتیکی‌هارزبورژیت‌های مجموعه اولترامافیک آبگرم (جنوب استان کرمان)

نویسندگان
دانشگاه شهید باهنر کرمان، دانشکدۀ علوم، گروه زمین شناسی
چکیده
مجموعه اولترامافیک آبگرم در منتهی­ الیه جنوب شرق زون سنندج- سیرجان و در مجاورت زون زاگرس واقع گردیده است و جزئی از کمربند افیولیتی اسفندقه­- ­­حاجی ­آباد به شمار می­رود. سه گروه سنگی متفاوت در مجموعه وجود دارد که از آن جمله می­توان به سنگ­های اولترامافیک، مافیک و دگرگونی اشاره کرد. سنگ­های اولترامافیک بیشتر در قالب هارزبورژیت، دونیت و لرزولیت می­باشند که از این بین هارزبورژیت­ها بیش از85 درصد از حجم واحدهای سنگی را در این مجموعه تشکیل داده­اند. شواهد میکروسکوپی نشانگر نسل­های مختلف کانی­ها در این سنگ­ها می­باشد. به علاوه شواهد مربوط به شیمی کانی­ها نشان می­دهد که این پریدوتیت­ها مرتبط به حوضه پشت قوس می­باشند که حدود 15 درصد ذوب­ بخشی را متحمل شده ­اند. دمای تعادل محاسبه شده بر اساس پورفیروکلاست­های پیروکسن و اجتماع الیوین­ اسپینل به ترتیب 816 تا 992 و 708 تا 840 درجه سانتی­گراد می­باشد و همچنین تخمین فوگاسیته اکسیژن بین 8/0 تا 9/0(Log-bar) نسبت به بافر کوارتز- مگنتیت- فایالیت می­باشد که تاریخچه چند مرحله ­ای از ذوب و تغییر شکل و تعادل مجدد ساب­ سالیدوس با فشار بین 1.2 تا 2 گیگاپاسکال را که منطبق بر محدوده پریدوتیت اسپینل ­دار می­باشد برای پریدوتیت آبگرم نشان می­دهد. شواهد شیمیایی نشان می­دهد که این سنگ­ها به پریدوتیت­ های آبیسال شباهت دارند و احتمالا در محیط حوضه ­پشت­ قوس شکل گرفته­ اند.
کلیدواژه‌ها

عنوان مقاله English

Petrology, mineral chemistry and petrogenetic evolutions of the harzburgites from Abgarm ultramafic complex (South of Kerman province)

نویسندگان English

Raziyeh Alipour
Hesam Moeinzadeh
Hamid Ahmadipour
Shahid Bahonar University
چکیده English

Abgarm ultramafic complex in termination of the southeast of Sanandaj- Sirjan is a part of the Haji Abad- Esfandagheh ophiolitic belt. This body consist of three different types of rocks includes of ultramafic rocks, mafic and metamorphic. Most ultramafic rocks are harzburgite, dunite, and lherzolite that harzburgites are more than 85 volume percent of this complex. Microscopic evidence suggests that there are several generations of minerals in these rocks. In addition, mineral chemistry data indicate that the Abgarm harzburgites have been formed in an environment similar to those considered for MORB peridotites and they passed about 15% partial melting. Pyroxene porphyroblasts and Olivin- Spinel thermometry in these harzburgites shows 816- 992 and 708- to 840 0C. Moreover, fO2 calculation gives a redox state that lies within a range of 1.6 log bar units around the Fayalite–Magnetite- Quartz buffer FMQ (log = -0.8 - 0.9 log-bar units) in the range of pressure of 1.2 and 2 GPa. For them and suggest that they have been equilibrated in spinel peridotite field for Abgarm peridotites. Chemical evidence shows that these rocks are similar to abyssal peridotites and probably formed in a back-arc basin environment.

کلیدواژه‌ها English

Abgarm ultramafic complex
Esfandagheh- Haji Abad
Harzburgite
ophiolite
Kerman
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