ویژگی‌های زمین شیمیایی و شیمی کانی کلینوپیروکسن سنگ‌های بازالتی منطقه گشت-ماسوله کوه‌های البرز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تبریز

2 دانشگاه پتسدام

چکیده

سنگ­های بازالتی در منطقه گشت-ماسوله در جنوب غرب فومن، استان گیلان، در واحدهای ژوراسیک و نیز واحدهای کرتاسه پسین در منطقه گسترش دارند. براساس شیمی سنگ کل، عدد منیزیم این سنگ­ها بین 30 و 7/31 است. الگوی عناصر خاکی نادر (REE)، غنی شدگی REE سبک را نسبت به REE سنگین نشان می­دهد (8/9 – 7/7  LaN/YbN =). ناهنجاری منفی Nb، Ta و Ti در نمودار عنکبوتی عناصر جزئی بهنجار شده به گوشته اولیه بیانگر تشکیل مذاب این سنگ­ها در محیط وابسته به قوس است. ویژگی شیمیایی درشت بلور کلینوپیروکسن با ترکیب دیوپسید نشانگر تبلور این کانی از یک ماگمای آهکی قلیایی در یک محیط وابسته به کشش است. براساس ویژگی­های زمین شیمیایی و شیمی کانی، این سنگ­ها در یک محیط کششی متبلور شده­اند و همچنین دارای ویژگی­های محیط قوس هستند که به ارث رسیده از فرورانش پیشین به احتمال بسیار فرورانش پوسته اقیانوسی تتیس کهن، در شمال ایران در رشته کوه البرز است.

کلیدواژه‌ها


عنوان مقاله [English]

Geochemistry and clinopyroxene mineral chemistry of basalts in the Gasht-Masuleh area, Alborz Mountains

نویسندگان [English]

  • Rezaei 1
  • Moazzen 1
  • Timmerman 2
1
2
چکیده [English]

Basalts in the Gasht-Masuleh area crop out in the SW Fuman, Gilan Province, and are exposed in the Jurassic and Late Cretaceous units in this area. Whole rock chemistry shows that the rock samples have Mg numbers between 30 and 31.7. Rare earth element patterns (REE) indicate light REE (LREE) enrichment and heavy REE (HREE) depletion (LaN/YbN= 7.7-9.8). Nb, Ta and Ti negative anomalies in primitive mantle normalized multi-element diagrams indicate the formation of parent melt in an arc-related tectonic setting. Clinopyroxene phenocrysts have diopside compositions, crystallized from a calc-alkaline basic parent melt in an extensional tectonic setting. These geochemical features indicate that the basalts of the Gasht-Masuleh area probably formed in an extensional related tectonic setting and inherited their arc signatures from a previous subduction event, possibly of the Paleo-Tethys Ocean crust subduction.
 

کلیدواژه‌ها [English]

  • Alborz Mts
  • Gasht-Masuleh
  • basalt
  • clinopyroxene
  • extensional tectonic setting
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