یافته‌های نوین زمین‌شناسی کاربردی

یافته‌های نوین زمین‌شناسی کاربردی

پترولوژی توده‌های نفوذی چناسک در شرق قزوین، البرز مرکزی: توضیحی برای ماگماتیسم ائوسن در یک محیط کششی همزمان با برخورد

نویسندگان
1 استادیار گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران
2 دانشجوی دکترا، گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
توده‌های نفوذی چناسک در شرق قزوین و در منتهی­الیه غربی البرز مرکزی قرار گرفته‌اند. این توده‌ها شامل سنگ‌های حدواسط مونزونیت و سینیت با بافت گرانولار با کانی‌شناسی عمدتاً پلاژیوکلاز، فلدسپات پتاسیم، آمفیبول و بیوتیت با درصد حجمی متفاوت می‌باشند. داده‌های سن‌سنجی U-Pb زیرکن نشان می­دهد که مونزونیت و سینیت به ترتیب سن­های تقریبا یکسان 5/0±8/41 و 6/0±2/41 میلیون سال دارند. این سنگ‌ها ویژگی ژئوشیمیایی کالک­آلکالن پتاسیم بالا تا شوشونیتی داشته و دارای غنی­شدگی از عناصر با شعاع یونی بزرگ (LILE) و نادر خاکی سبک (LREE) و تهی­شدگی از عناصر با شدت میدان بالا (HFSE) و نادر خاکی سنگین (HREE) هستند، که نشان‌دهنده­ی ماگماهای تشکیل شده در زون فرورانش می‌باشد. نسبت‌های ایزوتوپی Nd-Sr سنگ کل نشان می‌دهد که مقادیر ɛNd و87Sr/86Sr این سنگ‌ها از 5/0+ تا 2/1+ و 70483/0 تا 70648/0در تغییر است. داده‌های شیمی کل سنگ و ایزوتوپی نشان می‌دهد که ماگمای تشکیل دهنده­ی مونزونیت و سینیت از تفریق بلوری مذاب اولیه مشتق شده از گوشته‌ی متاسوماتیزم شده تشکیل شده که در یک حوضه‌ی کششی بر اثر برگشت به عقب ورقه فرورونده در زمان برخورد ورقه­های ایران و عربستان ایجاد شده است.
کلیدواژه‌ها

عنوان مقاله English

Petrology of Chenask intrusive rocks in the eastern Qazvin, central Alborz: An explanation for Eocene magmatism in an extensional basin related to syn-collisional setting

نویسندگان English

F. Sepidbar 1
B. Borouzi Niyat 2
1 Assist. Prof., Dept., of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
2 Ph. D. student, Dept., of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده English

The Chenasak intrusives are located in eastern Qazvin, western end of the central Alborz. These intrusives consist of granular-textured intermediate menzonite and syenite rocks with mineralogy mainly consisting of plagioclase, potassium feldspar, amphibole, and biotite with varying volume percentages. U-Pb zircon dating data indicate that the menzonite and syenite have approximately the same ages of 41.8±0.5 and 41.2±0.6 Ma, respectively. These rocks have high-potassium calc-alkaline to shoshonite geochemical characteristics and are enriched in large ionic radius elements (LILE) and light rare earth elements (LREE) and depleted in high field strength elements (HFSE) and heavy rare earth elements (HREE), indicating magmas formed in the subduction zone. Whole-rock Nd-Sr isotope ratios indicate that the ɛNd and 87Sr/86Sr values ​​of these rocks vary from +0.5 to +1.2 and 0.70483 to 0.70648. Whole-rock chemistry and isotopic data indicate that the magma forming the menzonite and syenite was formed by the crystalline fractionation of the primary melt derived from the metasomatized mantle in a tensile basin formed by the rollback of the subducting plate during the collision of the Iran and Arabia plates.

کلیدواژه‌ها English

Zircon U-Pb dating
Nd-Sr isotope
Crystal fractionation
Syn-collision extensional basin
Central Alborz
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  • تاریخ دریافت 11 مهر 1403
  • تاریخ بازنگری 26 آذر 1403
  • تاریخ پذیرش 28 آذر 1403