زمین دماسنجی و زمین فشارسنجی مینت‌‌های منطقه کوله سنگی، شمال زاهدان، جنوب شرقی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین شناسی، دانشکده علوم، دانشگاه سیستان و بلوچستان، زاهدان، ایران

چکیده

برای برآورد دماها و فشارهای تعادلی سنگ‌‌های لامپروفیر نوع مینت در منطقه کوله سنگی، شمال زاهدان، جنوب شرق ایران، از سه زمین دماسنج و یک زمین فشارسنج استفاده شد. زمین دماسنج‌‌ها عبارتند از دماسنج تبادلی TiO2 بین فلوگوپیت و مذاب همزیست، دماسنج تبادلی F-OH بین فلوگوپیت و آپاتیت، و دماسنج تبادلی Cr-Al-Fe3+ بین الیوین و اسپینل. زمین فشارسنج به کار رفته نیز بر اساس توزیع BaO در فلوگوپیت است. دماهای متوسط محاسبه شده با استفاده از سه زمین دماسنج به ترتیب
oC 1106 (با انحراف معیار 25)، oC1078 (با انحراف معیار 31) و oC 1069 (با انحراف معیار 77) هستند. دماهای محاسبه شده با هر سه زمین دماسنج نزدیکی قابل قبولی نشان می‌دهند. از این رو، دمای متوسط برابر باoC  1084 با انحراف معیار کوچک (19) است.  فشارهای محاسبه شده نیز بین 3/7 تا 3/10 کیلوبار و به طور متوسط برابر با 7/8 کیلوبار (با انحراف معیار 9/0) بوده که متناسب با عمق تقریبی 25 کیلومتر، نشانگر شرایط سنگ کره­ای و در منطقه لیتوسفری است.

کلیدواژه‌ها

عنوان مقاله [English]

Geothermobaromertry of minettes from Kouleh sangi area, north of Zahedan, southeast Iran

نویسندگان [English]

  • Ali Ahmadi
  • Habib Biabangard
Department of Geology, University of Sistan and Baluchestan, Zahedan, Iran
چکیده [English]

To determine the equilibrium temperatures and pressures of intrusive and hypabbyssal minettes from north of Zahedan (NZM), eastern Iran, three geothermometers and one geobarometer have been deployed.  These are phlogopite/liquid TiO2 exchange geothermometer, phlogopite-apatite F-OH exchange geothermometer, olivine-spinel Cr-Al-Fe3+ exchange geothermometer, and phlogopite geobarometer. The calculated temperatures show reasonable consistency for the three geothermometers.  Average temperatures for NZM rocks are: 1106 °C (SD = 25), 1078 °C (SD = 31) and 1069 °C (SD = 77) for the three geothermometers, respectively.  The calculated pressures are in the range 7.3 to 10.3 kbar (mean = 8.7; SD = 0.9), corresponding to depths of 23 to 30 km, well within the lithospheric mantle.  Phlogopite is the most abundant mineral and a near-liquidus phase in these rocks, the original P-T calibration has been done on a Mexican lamprophyre similar to NZMs and calculated temperatures show a narrow range with small standard deviations.  Therefore, the average pressure (8.7 kbar) and temperature (1106 ⁰C) obtained from phlogopite/liquid geothermobarometry are suggested for these rocks.
 

کلیدواژه‌ها [English]

  • geothermobarometry
  • olivine
  • spinel
  • phlogopite
  • north of Zahedan
  • SE Iran

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  • تاریخ دریافت: 12 دی 1402
  • تاریخ بازنگری: 20 بهمن 1402
  • تاریخ پذیرش: 26 اسفند 1402

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