دوره 29، شماره 1 - ( 1-1400 )                   جلد 29 شماره 1 صفحات 196-179 | برگشت به فهرست نسخه ها


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1- گروه زمین شناسی، دانشکده علوم پایه، دانشگاه فردوسی مشهد
2- گروه زمین شناسی، دانشکده علوم، دانشگاه لرستان
چکیده:   (1117 مشاهده)
منطقه اکتشافی بالازرد در 120 کیلومتری جنوب غرب نهبندان در استان خراسان جنوبی در بخش مرکزی کمربند آتشفشانی-ماگمایی قطعه لوت واقع است. نفوذ یک توده گرانیتوئیدی به درون سنگ­های ریولیتی و آندزیتی منجر به دگرسانی و کانی­سازی شده است. پهنه­­های دگرسانی شامل آرژیلیک، سریسیت-آرژیلیک، سیلیس-آرژیلیک، پروپلیتیک و آرژیلیک پیشرفته هستند. کانی­سازی سولفیدی و اکسیدی به صورت افشان، رگچه­ای، برش گرمابی و رگه­­های سیلیسی- کربناتی رخ داده است. داده­های رادیو ایزوتوپی و زمین شیمیایی سازگار  با ماگمای وابسته به فرورانش بوده که در کرانه قاره­ای فعال تشکیل شده است، این داده­ها همچنین بیانگر آغشتگی ماگما با پوسته بالایی طی صعود است. بر پایه ریزدماسنجی سیال­های درگیر در رگه کوارتزی طلادار، مقادیر دمای همگن شدگی از 385 تا550 درجه سانتیگراد و  شوری متوسط از 1/7 تا21 درصد وزنی معادل NaCl به دست آمد که بیانگر رخداد آمیختگی سیال­های کانه­ساز است. بررسی­های زمین­شناسی، کانی­شناسی، دگرسانی، سیال­­های درگیر و زمین­شیمی در منطقه بالازرد بیانگر رخداد دو نوع کانی­سازی فراگرمایی با درجه سولفیدشدگی بالا و پورفیری است.
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نوع مقاله: پژوهشي | موضوع مقاله: تخصصي

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