شیمی کانی‌ها و زمین دما – فشارسنجی توده نفوذی اسپید (غرب قم)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تهران

2 دانشگاه صنعتی شاهرود

چکیده

توده نفوذی اسپید با سن نئوژن در کمربند ماگمایی ارومیه - دختر بیرون‌زدگی دارد. آمفیبول­های موجود در این توده نفوذی از نوع کلسیمی و ماگمایی بوده و ترکیب آن­ها از مگنزیوهورنبلند تا اکتینولیت در تغییر است که نشان می­دهد که توده مورد بررسی نوع I است. بررسی­های زمین‌فشارسنجی حاکی از آن است که بلورهای آمفیبول در فشار حدود 5/2 تا 7/3 کیلو بار که معادل با اعماق 8 تا 12 کیلومتری زمین است متبلور شده­اند. همچنین بر اساس زمین­دماسنجی زوج کانی هورنبلند – پلاژیوکلاز و آمفیبول­ها، دمای بین 752 تا 865 درجه سانتی­گراد، برای تبلور این دو کانی در توده نفوذی اسپید به دست آمده است. همچنین مقادیر log ƒO2 برای این توده نفوذی برابر با 18/12- تا 27/15- است که نشان‌دهنده بالا بودن نسبی گریزندگی اکسیژن در ماگمای سازنده‌ی این توده و شاهدی بر تشکیل این توده در محیط­های فرورانش است.     

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry and geothermobarometry of Spid pluton (West Qom)

نویسندگان [English]

  • Rahimi 1
  • Mirnejad 1
  • Sheibi 2
  • Modabberi 1
1
2
چکیده [English]

Spid pluton with Neogene age outcrop in the Urumieh-Dokhtar Magmatic belt. Amphibole in this intrusion is calcic and magmatic and its composition corresponds to magnesiohornblende to actinolite which reflects the type I granitoid. Geobarometry calculations show that the amphibole crystalized at pressure of 2.5 to 3.7 kbr corresponding to a depth of 8 to 12 km. Based on geothermometry of hornblende - plagioclase pairs and amphibole, a temperature of 752 to 865 °C is estimated for crystallization of these two minerals at the Spid pluton. In addition, log ƒO2 for this pluton equals to -12.18 to -15.27, which reflects relatively high oxygen fugacity in magma and indicates the formation of this pluton in the subduction zone.

کلیدواژه‌ها [English]

  • Mineral chemistry
  • geothermobarometry
  • Spid pluton
  • oxygen fugacity

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مجله بلورشناسی و کانی شناسی ایران
دوره 26، شماره 1 - شماره پیاپی 69
فروردین 1397
صفحه 137-148

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  • تاریخ دریافت: 18 بهمن 1395
  • تاریخ بازنگری: 08 خرداد 1396
  • تاریخ پذیرش: 14 تیر 1396

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