شیمی کانی و زمین دما-فشارسنجی سنگ‌های رسی دگرگون شده مجموعه دگرگونی گیسور، شرق گناباد

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه لرستان

2 دانشگاه فردوسی مشهد

3 دانشگاه زنجان

4 آکادمی علوم

چکیده

منطقه گیسور در شرق شهرستان گناباد، بخشی از شمال قطعه لوت محسوب می­شود. سنگ­های این منطقه شامل سنگ­های گرانیتوئیدی و مجموعه­ دگرگونی هستند. در سنگ­های متاپلیتی (رسی دگرگونه) این منطقه وجود شیستوارگی S1 و کانی کلریتوئید شاخص دگرگونی ناحیه­ای است و به عنوان شواهد دگرگونی مجاورتی می­توان به وجود بافت­های تصادفی در کانی­های آندالوزیت، استارولیت، مسکوویت؛ گارنتِ پس از زمین ساخت و رشد سیلیمانیت منشوری به درون لبه آندالوزیت اشاره کرد. گارنت دارای دو مرحله رشد بوده و بیشتر دارای اعضای پایانی آلماندین، گروسولار و اسپسارتین است. کلریتوئید و استارولیت از نوع آهن­دار هستند. مسکوویت کمی جایگزینی از نوع پاراگونیت دارد. کلریتی شدن بیوتیت و گارنت، سریسیتی شدن آندالوزیت و بروز ریزترک­های شعاعی در گارنت همه نشان دهنده یک دگرگونی پسرونده و بالاآمدگی هستند. براساس روش­های زمین دما-فشارسنجی مرسوم، دما و فشار این مجموعه دگرگونی در گستره­های oC 608 – 550 و kbar 5/4 - 8/3 برآورد شدند. وجود ریزترک­های شعاعی پیرامون میانبار­های کوارتز در گارنت ناشی از یک مؤلفه بزرگ کاهش فشار همدماست.

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry and geothermobarometry of the metapelites of Geysour metamorphic complex, east of Gonabad

نویسندگان [English]

  • Pourmohammad 1
  • Ahmadi Khalaji 1
  • Homam 2
  • Ebrahimi 3
  • Esmaeili 4
  • Tahmasebi 1
1
2
3
4
چکیده [English]

Geysour area, east of Gonabad, is a part of the northern Lut block. The rocks in this area include granitoid and a series of metamorphic rocks. In metapelitic rocks, the presence of S1 schistosity and the mineral chloritoid are indicative of regional metamorphism. The presence of random textural evidence in minerals such as andalusite, staurolite, muscovite and post-tectonic garnet and silimanite growth within the andalusite margin is characteristic of contact metamorphic rocks. The mineral garnet has two stages of growth, and mainly contains the end-members of Almandine, Grossular and spessartine. Chloritoid and staurolite are ferrous. Muscovite has little paragonite replacement. Chloritization of biotite and garnet, sericitization of andalusite and the occurrence of radial micro-cracks in garnet all indicate a retrograde metamorphism and uplift. Based on conventional geothermobarometric methods, temperature and pressure were calculated in the range of 550-608 oC and 3.8-4.5 Kbar, respectively. The existence of radial micro-cracks around quartz inclusions in garnet is due to a large component of isothermal decompression.

کلیدواژه‌ها [English]

  • Geysour
  • Gonabad
  • regional metamorphism
  • contact metamorphism
  • geothermobarometer
  • Lut block

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  • تاریخ دریافت: 04 شهریور 1398
  • تاریخ بازنگری: 03 آبان 1398
  • تاریخ پذیرش: 06 آذر 1398

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