منشأ کانسنگ‌های مگنتیت و آپاتیت در کانسار مگنتیت- آپاتیت اسفوردی، شمال‌ شرق بافق، جنوب یزد: شواهدی از کانی‌ شناسی، زمین‌ شیمی، ریزدماسنجی، ایزوتوپ‌ های پایدار O-H و ایزوتوپ‌ های ناپایدار U-Pb و Nd-Sm

زمین شناسی اقتصادی

دوره 14، شماره 4 - شماره پیاپی 35، دی 1401، صفحه 31-88   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2022.76456.1045

نویسندگان

کیامرث حسینی¹؛ محمدعلی رجب زاده^{* 2}

¹دانشجوی دکتری، گروه زمین‌شناسی، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران

²استاد، بخش علوم زمین، دانشکده علوم، دانشگاه شیراز، شیراز، ایران

چکیده

داده‌های سنگ‌نگاری و کانی‎ شناسی بیانگر حضور پنج نسل آپاتیت و دو نسل مونازیت به صورت گسترده و زنوتیم به صورت محدود در کانسار اسفوردی است. ایزوتوپ‌های پایدار O-H و محتوای Sr و Mn در آپاتیت‌های نسل اول و دوم و آپاتیت‌های ریز بلور توده‌ای و رگه‌ای، منشأ فسفر در آپاتیت‌های اسفوردی را در زمره فسفریت‌های رسوبی قرار می‌دهند. نسبت مقادیر ¹⁴³Nd/¹⁴⁴Nd به ¹⁴⁷Sm/¹⁴⁴Nd و εNd به میزان P₂O₅ و تفاوت در نسبت ایزوتوپی Nd در آپاتیت‌های ریز بلور توده‌ای و رگه‌ای، بیانگر عدم ارتباط زایشی آنها با سنگ‌های ریولیتی، دیوریتی و میکرودیوریتی میزبان است. شباهت نسبت ¹⁴³Nd/¹⁴⁴Nd به ¹⁴⁷Sm/¹⁴⁴Ndو εNd به میزان P₂O₅ در آپاتیت‌های بلورین نسل اول و دوم به نسبت‌های مشابه آنها در سنگ‌های‌ میزبان، ناشی از تبلور مجدد کانسنگ‌ فسفاته، تحت‌تأثیر سیال‌های ماگمایی و گرمابی با منشأ توده‌های نفوذی نیمه‌ عمیق فلسیک تا حدواسط و بالا رفتن مقادیر εNd آنهاست. تفاوت سنی آپاتیت‌های نسل دوم و مونازیت‌های مرتبط با آن (سن‌سنجی به روش ²³⁸U/²⁰⁶Pb و ²⁰⁷Pb/²⁰⁶Pb)، وجود آپاتیت و مگنتیت بلورین و بافت برون‌رستی ایلمنیت در کانی مگنتیت، وجود شواهد انحلالی در نسل‌های مختلف آپاتیت و مونازیت، نسبت‌های Ti در مقابل V، Al+Mn در مقابل Ti+V و Mg+Al+Si در مقابل Ti و داده‌های ایزوتوپ‌های پایدار O-H بر روی کانسنگ آپاتیت و مگنتیت، بیانگر اختلاط سیالات ماگمایی و گرمابی دما بالا با شورابه‌های تبخیری‌ غنی از Ca ±Fe، P، REE  در بازه‌های زمانی مختلفی است که سبب منشأ چندزادی در کانسار اسفوردی شده است.

کلیدواژه‌ها

کانی‌ شناسی؛ زمین‌ شیمی؛ ایزوتوپ‌ های پایدار و ناپایدار؛ کانسار اسفوردی؛ بافق

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