بررسی سنگ‌نگاری، زمین‌شیمی و تعیین دما و فشار تبلور کانی‌های پیروکسن و پلاژیوکلاز در دایک‌های دیابازی و لامپروفیری قطعه جوپار در جنوب کرمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه هرمزگان

2 دانشگاه کرمان

چکیده

در جنوب شهر کرمان و در غرب روستای گلومک، مجموعه‌ای از دایک‌های دیابازی و لامپروفیری با روند شمال غرب- جنوب شرق رخنمون دارند. این دایک­ها با ضخامت حدود1-5 متر در سنگ­های آتشفشانی میزبان (به سن نوزا) قطعه جوپار در پهنه ایران مرکزی و بخش جنوبی قطعه پشت بادام نفوذ کرده‌اند. بافت غالب دایک­های دیابازی و لامپروفیری پورفیری و گلومروپورفیری است. بلورهای دیوپسید، الیوین و آمفیبول فازهای اصلی و بلورهای ریز پلاژیوکلاز در زمینه از ویژگی­های لامپروفیرهاست. سنگ‌های دیابازی دارای فازهای اصلی دیوپسید و فلدسپار هستند. بررسی دما- فشارسنجی به روش‌های مختلف نشان می‌دهد که فشار تبلور پیروکسن­ها حدود 6 کیلوبار و دمای تبلور آنها حدود 1200 درجه سانتیگراد بوده است. دماسنجی به روش فلدسپارها دمای حدود 500-650 درجه سانتیگراد را نشان می­دهند که پایین بودن این دما می­تواند ناشی از دگرگونی­های زیر نقطه انجماد ترکیب فلدسپارها طی تبلور باشد. بر اساس ترکیب شیمیایی پیروکسن­ها و برپایه نمودارهای شناسایی جایگاه زمین­ساختی، ماگمای سازنده دایک­های مورد بررسی قلیایی و وابسته به پهنه فروروانش بوده و از ذوب­بخشی گوشته گارنت‌دار پدید آمده است.    

کلیدواژه‌ها


عنوان مقاله [English]

Petrography, geochemistry and determination of temperature and pressure of crystallization of pyroxene and plagioclase minerals in diabasic and lamprophyre dykes of Jupar block (south of Kerman)

نویسندگان [English]

  • Arzhangnezhad 1
  • Ghadami 1
  • Moradian 2
  • Poosti 1
1
2
چکیده [English]

A set of diabasic and lamprophyre dykes, trending NW-SE, cut the Neogene volcanic rocks that exposed in the south of Kerman city and west of Glomac village. They are characterized by porphyritic and glomeroporphyry textures. Lamprophyres contain course- grained phenocryst of olivine- pyroxene- amphibole in a matrix containing feldspars. diabasic rocks are dominated by main minerals including diopside and feldspar. Thermo-barometric studies of pyroxenes show that the rocks under discussion have formed under pressure of 6 Kb and temperature of 1200°C. Thermometry of the feldspar in dykes show 500- 650 °C. This low temperature caused changes in the freezing point of the feldspar composition during crystallization. Based on the pyroxene chemistry and tectonomagmatic environment diagrams, all of studied samples plot in the island arc setting of a subduction zone and show active continental setting characteristics. The primary magma of the studied rocks is the melting of a lherzolite garnet mantle source.

کلیدواژه‌ها [English]

  • Diabae
  • Lamprophyre
  • alkaline
  • garnet mantle
  • Central Iran
  • Jupar
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