شیمی کانی‌ و تحولات دگرگونی‌ها در متاپلیت‌های نئوپروتروزوئیک پسین مجموعه دگرگونی– آذرین جنوب دوچاه (جنوب‌شرق شاهرود)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه صنعتی شاهرود

2 دانشگاه آریستوتل

چکیده

متاپلیت­های مجموعه پی­سنگی دگرگونی- آذرین دوچاه (واقع در جنوب­شرق شاهرود) به سن نئوپروتروزوئیک پسین شامل میکاشیست، گارنت­شیست، کلریتوئید­شیست و گارنت­گنیس هستند. در بالاترین درجه دگرگونی، متاپلیت­ها دچار ذوب­بخشی شده­اند و در آن­ها گرانیت­زایی صورت گرفته است. بخش قابل توجهی از متاپلیت­ها، اثر نظام زمین­ساختی تراکمی را به صورت وجود شواهد بارز دگرریختی و میلونیتی­شدن شدید نشان می­دهند. کلریت­های ثانویه و فنژیت­های موجود در متاپلیت­ها شواهدی از دگرگونی­
پسرونده­ای هستند که در شرایط دما – فشار رخساره شیست سبز و طی بالازدگی این مجموعه تشکیل شده­اند. دما – فشارسنجی متاپلیت­ها بیانگر بروز یک نظام دگرگونی پیشرونده نوع بارووین عادی، در ارتباط با رخداد کوهزادی کادومین (نئوپروتروزوئیک­پسین) در شرایط دما و فشار رخساره­های شیست­سبز تا آمفیبولیت­بالایی است.     

کلیدواژه‌ها


عنوان مقاله [English]

Mineral Chemistry and metamorphic evolution of the Late Neoproterozoic metabasites of Do-Chah metamorphic - igneous complex (SE Shahrood)

نویسندگان [English]

  • Mojgan Rezaei 1
  • mahmood Sadeghian 1
  • habiballah Ghasemi 1
  • Papadopaelo Lambrini 2
1
2
چکیده [English]

Metapelites of the Do Chah complex (SE Shahrood) are composed of micaschist, garnet micaschist, chloritoid schist and garnet-bearing gneiss. In the highest degree of metamorphism, metapelites have been affected by partial melting, resulting as granitization. A significant part of these rocks, imposed by compressional tectonic regime and show typical evidence of plastic deformation and intensive mylonitization. Secondary chlorite and phengite in metapelites are indicators of retrograde metamorphism which occurred during uplifting and P-T condition of greenschist facies. Thermobarometry of these rocks shows the occurrence of a Barrovian type progressive metamorphism in relation to Cadomian orogeny (Late Neoproterozoic) in P-T conditions of greenschist to upper amphibolite facies.

کلیدواژه‌ها [English]

  • Mineral chemistry
  • metamorphic evolution
  • metabasite
  • Neoprotrozoic
  • Do Chah
  • Shahrood
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