بررسی پتروژنز سرپنتنیت‌های منطقه گرماب در پهنه افیولیت کرمانشاه (غرب ایران) با استفاده از شیمی‌کانی‌ها و نمودارهای فازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دنشکده علوم زمین، دانشگاه شهید چمران اهواز

2 گروه زمین‌شناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران

3 گروه زمین شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی

چکیده

منطقه گرماب در شمال شرقی کامیاران جای دارد و بخشی از مجموعه معروف به پهنه افیولیت کرمانشاه است. این مجموعه در میان پهنه سنندج- سیرجان و پهنه راندگی زاگرس قرار دارد. پریدوتیت‌های این پهنه تحت تاثیر دگرسانی گرمابی به صورت کامل و یا بخشی با سرپنتینیت جایگزین شده‌اند. بر اساس مطالعات سنگ نگاری، این سرپنتین‌ها از آبگیری الیوین و ارتوپیروکسن شکل گرفته‌ است. تجزیه الکترون مایکروپروب و پراش پرتو ایکس (XRD) نمونه‌ها نشان می‌دهد که در سرپنتینیت‌های منطقه گرماب، هر سه چند ریخت سرپنتین (کریزوتیل، لیزاردیت و آنتیگوریت) حضور دارند. سرپنتین‌های حاصل از الیوین‌ها دارای SiO2 بیشتر و Al2O3، Cr2O3 و TiO2 کمتری نسبت به انواع حاصل از ارتوپیروکسن‌ها هستند که تفاوت در منشاء آنها را به خوبی آشکار می‌سازد. نمودار فازی محاسبه شده برای نمونه‌های مورد مطالعه نشان می‌دهد که این سرپنتینیت‌ها احتمالا در طی دو رویداد دگرگونی شکل گرفته‌اند؛ رویداد اول شامل دگرسانی و آبگیری هارزبورژیت تا دماهای کمتر از 300 درجه سانتیگراد و فشار کمتر از 4 کیلوبار است. رویداد دوم در نتیجه افزایش دما و فشار تا بیشتر از 450 درجه سانتیگراد و 4 کیلوبار رخ داده است.

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