سنگشناسی و زمینشیمی سنگهای گرانیتوئیدی و حدواسط باغچه مریم (جنوب قروه، استان کردستان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه خوارزمی

2 دانشگاه آزاد اسلامی واحد تهران شمال

چکیده

توده گرانیتوئیدی باغچه مریم در جنوب قروه بخشی از توده‌های نفوذی پهنه سنندج- سیرجان است که روند شمال غربی- جنوب شرقی دارد. بر اساس بررسی­های صحرایی و کانی‌شناسی، مجموعه نفوذی باغچه مریم از دو واحد اسیدی و حدواسط با طیف سنگ‌های دیوریتی، مونزودیوریتی، گرانیتی، سینیتی و آپلیتی تشکیل شده است. بررسی­های زمین‌شیمیایی نشان می‌دهد که سنگ‌های این مجموعه از نوع متاآلومین (81/0-46/0A/CNK=) و آهکی­قلیایی هستند. بر پایه نتایج (از جمله غنی‌شدگی از عناصر خاکی­نادر سبک و تهی‌شدگی آنها از عناصر خاکی­نادر سنگین)، این واحدهای سنگی توسط فرایندهای ماگمایی گوناگون ایجاد شده‌اند و وابسته به محیط زمین‌ساختی کرانه فعال قاره‌ای هستند و ویژگی­های ماگماهای نوع I را نشان می‌دهند. با بررسی­های زمین‌دما فشارسنجی، میانگین دمای نمونه‌ها حدود 700 درجه سانتیگراد و عمق حدود 7 تا 10 کیلومتر برآورد شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Petrology and geochemistry of Baghche-Maryam granitoid and intermediate rocks (south Ghorveh, Kurdistan Province)

نویسندگان [English]

  • Alaminia 1
  • Sheikhi 2
  • Razavi 2
1
2
چکیده [English]

Baghche-Maryam granitoid (in south of Ghorveh Area) is a part of the intrusive bodies of the Sanandaj-Sirjan zone with NW-SE trending. Based on field observations and mineralogical studies, the intrusion complex of Baghche-Maryam including of two acidic and intermediate units: diorite, monzodiorite, granite, syenite, and aplite. Geochemical studies show the rocks of this complex are metaalumine type (A/CNK= 0.81-0.46) and calc-alkaline. Petrological, mineralogical, and geochemical studies together with field observations indicate that these rocks are generated by various magmatic processes and are related to the active continental margin geodynamic environment (e.g. LREE enrichments and HREE depletions) and have I-type magmatic characteristics. According to thermobarometery studies, the average temperature in the studied samples is about 700 oC and the average depth is about 7-10 kilometers.

کلیدواژه‌ها [English]

  • Sanandaj-Sirjan
  • Granitoid
  • Baghche-Maryam
  • geochemical
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