یافته‌های نوین زمین‌شناسی کاربردی

یافته‌های نوین زمین‌شناسی کاربردی

کاربرد شیمی­ کانی پیروکسن در ارزیابی زمین دما- فشارسنجی هارزبورژیت ­های موجود در شرق حاجیآباد (استان هرمزگان): رهیافتی بر تحولات سنگ‌زایی و جایگاه زمین‌ساختی

نویسندگان
1 دانشجوی دکترا، گروه زمین‌شناسی، دانشکده علوم طبیعی، دانشگاه تبریز، آذربایجان شرقی، ایران
2 استادیار گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه ولایت، ایرانشهر، سیستان و بلوچستان، ایران
3 دانش‌آموخته کارشناسی‌ارشد، گروه زمین‌شناسی، دانشگاه آزاد اسلامی، زرند، کرمان، ایران
چکیده
پریدوتیت‌های گوشته‌ای بخش مهمی از کمربند افیولیتی اسفندقه- حاجی­آباد در جنوب‌شرق زون سنندج- سیرجان را تشکیل می‌دهند. هارزبورژیت­های شرق حاجیآباد با داشتن کانی‌هایی چون الیوین، ارتوپیروکسن و کلینوپیروکسن، اصلی­ترین واحد در میان این مجموعه سنگ‌های اولترامافیک بوده که لایه­بندی آشکاری ندارند و به صورت توده‌ای مشاهده می‌شوند. جهت­یافتگی موجود در کانی­ها، تبلور دوباره و نسل­های مختلف کانی­ها بیانگر تشکیل این سنگ­ها در گوشته بالایی و جایگیری آن­ها در محیط پوسته‌ای است. بررسی‌های شیمی کانی پیروکسن موجود در هارزبورژیت‌ها نشان می‌دهد که در این سنگ‌ها ارتوپیروکسن‌ها‌ در محدوده انستاتیت و کلینوپیروکسن‌ها­ در گستره دیوپسید واقع شده‌اند. بر اساس مطالعات دماسنجی و فشارسنجی بر روی بلورهای پیروکسن موجود در هارزبورژیت‌ها، دمای تعادل در حدود 11/1342 درجه سانتی­گراد و فشار به دست آمده در زمان تبلور در حدود 12/14 کیلوبار می‌باشد که با محدوده اسپینل پریدوتیت مطابقت دارد. بر مبنای مطالعات ژئوشیمیایی و زمین‌ساختی، هارزبورژیت‌های شرق حاجی‌آباد در محدوده پریدوتیت‌های آبیسال به سوی یک پهنه فرافرورانش احتمالاً مشابه حوضه پشت‌کمانی با حدود 12درصد ذوب‌بخشی تشکیل شده‌اند. رفتار عناصر خاکی نادر مرتبط با نمونه‌های سنگی منطقه مورد مطالعه نیز، فرآیند ذوب‌بخشی و متاسوماتیسم رخ داده در زمان تشکیل این سنگ­ها را اثبات می‌کند.
کلیدواژه‌ها

عنوان مقاله English

Ineral chemistry and geothermobarometry of pyroxenes in East Harzburgites of Hajiabad (Hormozgan province): Implication to petrogenetic evolution and tectonomagmatic setting

نویسندگان English

H. Falahi 1
S. Sedighian 2
R. Akbarpour 3
1 Ph. D. student, Dept., of Geology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
2 Assist. Prof., Dept., of Geology, Faculty of Sciences, Velayat University, Iranshahr, Sistan and Bluchestan, Iran
3 M. Sc. (graduated), Dept., of Geology, Islamic Azad University of Zarand, Kerman, Iran
چکیده English

Mantle peridotites form an important part of Esfandah-Hajiabad ophiolitic belt on the southeast of Sanandaj-Sirjan zone. The East Harzburgites of Hajiabad, having minerals such as olivine, orthopyroxene, and clinopyroxene, are the main unit among this set of ultramafic rocks that do not have obvious layering and are observed as masses. The orientation of minerals, recrystallization and different generations of minerals indicate that these rocks are prouduced in the upper mantle and implacement in the crustal environment. Mineral chemistry of pyroxene in harzburgites show that in these rocks, orthopyroxenes are located in the enstatite range and clinopyroxenes are located in the diopside range. Based on thermometric and barometric studies on pyroxene crystals in harzburgites, the equilibrium temperature is around 1342.11 ͦ C and the crystallization pressure is around 14.12 kb, which corresponds to the range of spinel peridotite. Based on geochemical and tectonic studies, the harzburgites in the east of Hajiabad were formed in the range of abyssal peridotites towards a supersubduction zone, probably similar to back-arc basin with about 12% partialmelting. The behavior of rare earth elements associated with the rock samples of the study area also proves the partialmelting and metasomatism processes that occurred during the formation of these rocks.

کلیدواژه‌ها English

Geothermobarometry
Pyroxene
Metasomatism
Partial melting
Harzburgite
Hajiabad
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  • تاریخ دریافت 30 مرداد 1403
  • تاریخ بازنگری 26 آبان 1403
  • تاریخ پذیرش 19 آذر 1403