بررسی‌های سنگ‌نگاری، کانی‌شناسی و زمین شیمیایی سنگ‌های آتشفشانی در منطقه گرازی، جنوب‌غرب خواف، استان خراسان رضوی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

منطقه­ی مورد بررسی در شمال­شرق ایران و 10 کیلومتری جنوب­غربی شهرستان خواف واقع شده است. این منطقه دارای برونزدهایی از سنگ­های رسوبی (کنگلومرا)، آتشفشانی (داسیت، آندزیت، بازالت) و آذرآواری (ایگنمبریت) با سن ائوسن پسین است. واحد بازالتی دارای بافت­های پورفیری، گلومروپورفیری، شیشه­ای، غربالی و بادامکی است. کانی­های این واحد شامل پلاژیوکلاز، پیروکسن، هورنبلند و الیوین هستند. در واحد آندزیتی، بافت­های پورفیری با زمینه ریزسنگی، شیشه­ای، گلومروپورفیری و غربالی شناسایی شدند. کانی­های اصلی آن پلاژیوکلاز، هورنبلند و فلدسپار قلیایی هستند. واحد داسیتی دارای بافت پورفیری بوده و شامل کانی­های پلاژیوکلاز و کوارتز و به مقدار کمتر فلدسپار قلیایی است. واحدهای آتشفشانی گرازی ماهیت آهکی قلیایی تا آهکی قلیایی با پتاسیم بالا دارند. غنی شدگی عناصر خاکی نادر سبک (LREE)ها نسبت به عناصر خاکی نادر سنگین (HREE)ها و غنی­شدگی عناصر سنگ دوست بزرگ یون (LILE) نسبت به عناصر با شدت میدان بالا (HFSE) شواهد مهمی گویای این هستند که این واحدها در کمربند ماگمایی پهنه فرورانش تشکیل شده­اند. با توجه به داده­های زمین شیمیایی، سنگ­های آتشفشانی از گوشته غنی شده شکل گرفته­اند و از بین اجزای فرورانشی، دگرنهادی مربوط به رسوب­ها، مهمترین نقش را داشته­است.   

کلیدواژه‌ها


عنوان مقاله [English]

Petrography, mineralogy and geochemistry of volcanic rocks in Gorazi area, southwest Khaf, Razavi Khorasan Province

نویسندگان [English]

  • Seyed Masoud Homam
  • Farahnaz Mohamadpour
  • Maryam Javidi Moghaddam
Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

The study area is located in northeast Iran, about 10 Km southwest of Khaf city. Geology of the area includes the Upper Eocene sedimentary (conglomerate), volcanic (basalt, andesite, dacite) and pyroclastic (ignimbrite) rocks. The basalt unit displays porphyritic, glomeroporphyry, vitric, sieve and amygdaloidal textures. The minerals are mainly plagioclase, pyroxene, hornblende and olivine. The andesite unit has porphyry, with microlitic groundmass, vitric, glomeroporphyry and sieve, textures. The minerals mainly consist of plagioclase, hornblende, and K-feldspar. The dacite unit has porphyry texture and consists of plagioclase and quartz minerals with lesser amounts of K-feldspar. Volcanic units of Gorazi have characteristic of Calc-alkalic to high-K Calc-alkalic. Enrichment of LREE relative to HREE and LILE to HFSE are important evidences that magma was formed in a magmatic belt of a subduction zone. Based on geochemical data, the volcanic rocks are originated within the enriched mantle source and, among subduction components, metasomatism related to sediments has played the most important role.

کلیدواژه‌ها [English]

  • petrography
  • mineralogy
  • Geochemistry
  • Gorazi
  • Khuf
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