سنگ‌‌شناسی، زمین‌شیمی و خاستگاه سنگ‌های آتشفشانی منطقه مهریز یزد

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

2 گروه علوم زمین، دانشگاه پیام نور ایذه

3 گروه علوم زمین، دانشگاه استانبول

10.22128/ijcm.2026.3255.1029

چکیده

سنگ­های آتشفشانی ائوسن در منطقه مهریز از تناوب گدازه و مواد آذرآواری تشکیل شده­اند. بررسی­های زمین­شیمیایی و سنگ­نگاری نشانگر ترکیب بازیک تا حد واسط برای ماگمای سازنده این سنگ­هاست که به طور عمده از بازالت، آندزیت بازالتی و آندزیت تشکیل شده­اند. کانی­های اصلی این سنگ­ها پلاژیوکلاز، آمفیبول، کلینوپیروکسن و الیوین هستند و بافت غالب آنها ریزسنگی پورفیری است. سرشت ماگمایی این سنگ­ها آهکی قلیایی تا آهکی قلیایی پتاسیم بالا و شوشونیتی است. بررسی نمودارهای عنکبوتی نشان دهنده غنی­شدگی این سنگ­ها از عناصر سنگ دوست درشت یون (LILE) و عناصر خاکی نادر سبک (LREE) و تهی­شدگی از عناصر با شدت میدان بالا (HFSE) و عناصر خاکی نادر سنگین (HREE) است. ناهنجاری­های منفی عناصرNb, Ta  و Ti نشان می­دهد که ماگمای مادر سنگ­های آتشفشانی مهریز یک خاستگاه گوشته­ای وابسته به محیط­های فرورانش دارد. همچنین نمودارهای زمین­شیمیایی نشان می­دهد که سنگ­های آتشفشانی منطقه در یک محیط زمین­ساختی منطبق بر قوس­های ماگمایی پس از برخورد شکل گرفته­اند.

کلیدواژه‌ها


عنوان مقاله [English]

Petrology, geochemistry and origin of volcanic rocks in the Mehriz region of Yazd

نویسندگان [English]

  • Hamideh Javadi 1
  • Mohsen Moayyed 1
  • Hamid Harati 2
  • Gultekin Topuz 3
1 Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
2 Department of Earth Sciences, Payam Noor University of Izeh
3 Department of Earth Sciences, Istanbul University
چکیده [English]

The Eocene volcanic rocks in the Mehriz area are composed of an alternation volcanic and pyroclastic rocks. Geochemical and petrographic studies indicate a basic to intermediate composition for the parent rock types, which is mainly composed of basalt, basaltic andesite, and andesite. Plagioclase, amphibole, clinopyroxene and olivine are the main minerals forming these rocks, and the dominant texture forming the rocks is microlithic porphyric. The magmatic series of these rocks is calc-alkaline to high-potassium calc-alkaline and shoshonitic. Examination of spider diagrams shows that these rocks are enriched in large-ion lithophile elements (LILE) and light rare earth elements (LREE) and depleted in high-field-strength elements (HFSE) and heavy rare earth elements (HREE). Negative anomalies of Nb, Ta and Ti elements indicate that the parent magma of volcanic rocks has a mantle origin related to subduction environments. respected geochemical diagrams hint to a post-collisional magmatic arc environment for these rocks.

کلیدواژه‌ها [English]

  • Key words: Mehriz
  • Eocene
  • volcanic rocks
  • magmatic arc
  • post-collisional
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