سنگ شناسی و زمین شیمی سنگ‌های آذرین مجموعه بغیجان، جنوب راور، استان کرمان

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم، دانشگاه آزاد اسلامی واحد زرند، ایران

چکیده

مجموعه بغیجان در جنوب شهرستان راور در پهنه ساختاری ایران مرکزی قرار دارد. این مجموعه به صورت گسله در مرز با سنگ­های کربناتی کرتاسه واقع بوده که شامل مجموعه­ای از سنگ­های آذرین، دگرگونی و رسوبی است. سنگ­های آذرین این مجموعه بیشتر آتشفشانی از نوع بازالت،­ آندزیت-بازالت، آندزیت، تراکی آندزیت، تراکیت همراه با کانی­های اصلی پیروکسن و پلاژیوکلاز هستند. همچنین سنگ­های آتشفشانی تراکیت، ریولیت و داسیت به طور عمده از کانی­های پلاژیوکلاز، کوارتز و فلدسپار  پتاسیم تشکیل شده­اند. سنگ­های مونزونیت و گرانودیوریت نیز به عنوان سنگ­های نفوذی تشکیل دهنده این منطقه حضور دارند که کانی­های درشت پلاژیوکلاز به عنوان کانی اصلی در این سنگ­ها تشکیل شده­اند. بافت­های پورفیریک، انبوهه پورفیری، غربالی، جریانی، بین دانه­ای و میرمکیت از مهم­ترین بافت­های تشکیل دهنده سنگ­های آذرین (نفوذی و آتشفشانی) مجموعه بغیجان هستند. شواهد زمین شیمیایی نشان می‌دهند که ماگمای سازنده سنگ‌های مجموعه بغیجان از درجه­های پایین ذوب بخشی شکل گرفته و همچنین دچار فرآیند جدایش ماگمایی شده است.بر پایه مقادیر عناصر اصلی و فرعی، سنگ­های مورد بررسی دارای ترکیب بازالتی و قلیایی بازالت هستند و اغلب در گستره قلیایی­ قرار دارند. براساس نمودارهای تشخیص محیط زمین ساختی، سنگ­های مجموعه بغیجان بازالت­های جزایر اقیانوسی در ارتباط با کافت­های درون قاره­ای هستند که در محیط زمین­ساختی کششی فوران کرده­­اند و فعالیت ماگمایی پس از برخورد را نشان می­دهند.

کلیدواژه‌ها


عنوان مقاله [English]

Petrology and geochemistry of igneous rocks of the Baghijan diapiric complex, south of Ravar, Kerman province

نویسندگان [English]

  • mojtaba Sadoghi
  • Seyed abdolreza Jafari sadr
  • Amir Shafiei Bafti
Department of Geology, Faculty of Science, Islamic Azad University, Zarand Branch, Iran
چکیده [English]

The Baghijan diapir complex is located in the south of Ravar County in the Central Iran structural zone. This diapir complex is located in the form of a fault on the border with Cretaceous carbonate rocks, which includes a set of igneous, metamorphic and sedimentary rocks. The igneous rocks of this diapir complex mainly include volcanic rocks of the basalt, andesite-basalt, andesite, trachy-andesite, along with the main minerals pyroxene and plagioclase. Also, the volcanic rocks trachyte, rhyolite and dacite are mainly composed of plagioclase, quartz and potassium feldspar minerals. Monzonite and granodiorite rocks are also present as intrusive rocks forming this area, and coarse plagioclase and quartz minerals are formed as the main minerals in these rocks. Porphyric, glomeroporphyritic, sieve, trachytic, intergranular and myrmekite textures are among the most important textures forming the igneous rocks of the Baghijan diapiric complex. Geochemical evidence shows that the magma forming the rocks of the Baghijan diapiric complex was derived from the differentiation of a mafic magma from the mantle. The main and minor elements of the studied rocks have basaltic and alkaline basaltic compositions and are often in the alkaline range. The use of tectonic environment detection diagrams shows that the rocks of the Baghijan diapiric complex are oceanic island basalts or intracontinental alkaline magmatic rocks associated with intracontinental rifts that erupted in an extensional tectonic environment and show post-collision magmatism

کلیدواژه‌ها [English]

  • Baghijan diapiric complex
  • alkaline magmatic rocks
  • intracontinental rifts
  • Central Iran
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