کاربرد شیمی کانی‌های آمفیبول و پلاژیوکلاز در بررسی خاستگاه و زمین‌دما- فشارسنجی گرانیتوئید جبال‌بارز (بم، استان کرمان)

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه شهید باهنر

چکیده

گرانیتوئید جبال­بارز به سن الیگوسن در جنوب­شرقی شهرستان بم، و جنوب­شرقی کمربند ماگمایی ارومیه-دختر واقع است. براساس بررسی­های سنگ­شناسی، این توده شامل تونالیت، گرانودیوریت، گرانیت و ­گرانیت قلیایی است که کانی­های اصلی کوارتز، پلاژیوکلاز، آمفیبول، بیوتیت و فلدسپارقلیایی تشکیل ­دهنده­ی آن­هاست. آلبیت پلاژیوکلازها از 38/38 تا 26/67 درصد و ترکیب آن­ها از الیگوکلاز تا آندزین است. آمفیبول ­ها کلسیمی هستند و ترکیب آن­ها از مگنزیوهورنبلند تا چرماکیت تغییر می­کند که مشخصه­ی I بودن توده است. مقدار Na2O و ماهیت آهکی-قلیایی آمفیبول­ها نشان از نظام زمین­ساخت فرورانشی و مقادیر Al2O3، TiO2 و Mg#  آمفیبول­ها نشان از آمیزش منابع پوسته­ای و گوشته­ای در تشکیل ماگمای مولد دارند. بررسی زمین­فشارسنجی، میانگین فشار تبلور هورنبلند را 2 کیلوبار و دماسنجی برپایه مقدار آلومینیوم آمفیبول و زوج کانی هورنبلند- پلاژیوکلاز، میانگین دمای تبلور را 800 درجه سانتی­گراد برآورد می­کند. سنجش گریزندگی اکسیژن این توده، اکسیده بودن ماگمای مولد را نشان می­دهد.     

کلیدواژه‌ها

عنوان مقاله [English]

Application of amphibole and plagioclase mineral chemistry for studying of Jebal-E-Barez granitoid genesis and geothermobarometry (Kerman province, Bam)

نویسندگان [English]

  • shirin Behpour
  • Abbas Moradian
  • hamid Ahmadipour
Shahid Bahonar University of Kerman
چکیده [English]

The Jebal-E-Barez Oligocene granitoid is located in the southeastern Bam, and in the southeastern part of the Urumieh-Dokhtar Magmatic Assemblage. Based on petrographic studies, this granitoid includes tonalite, granodiorite, granite and alkaligranite, which are composed of quartz, plagioclase, amphibole, biotite and alkali feldspar. The albite of plagioclase ranges from 38.38 to 67.26 percent, and its composition is oligoclase to andesine. Composition of calcic amphiboles varies from magnesiohornblende to tschermakite, which is feature of I type granite. The Na2O amount and calc-alkaline nature of amphiboles indicate subduction zone for this granitoid, furthermore Al2O3, TiO2 and Mg#  amounts of amphiboles indicate crust and mantle mixing in the formation of granitoid magma. The geobarometry studies clarify that hornblende crystallization occurred in 2 kb, in addition to the geothermometry studies on aluminum of  amphibole and hornblende-plagioclase pair minerals display crystallization temperature average of Jebal-E-Barez granitoid is 800 oC. Jebal-E-Barez granitoid ƒO2 determine magma oxidation state.

کلیدواژه‌ها [English]

  • geothermobarometry
  • amphibole
  • plagioclase
  • Jebal-E-Barez granitoid
  • Bam

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  • تاریخ دریافت: 15 مهر 1396
  • تاریخ بازنگری: 08 دی 1396
  • تاریخ پذیرش: 14 بهمن 1396

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