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سید جواد مقدسی ابراهیم طالع فاضل عالیه سادات بنی فاطمی

چکیده

کانسار فلوریت- باریت (± سولفید) آتش کوه در جنوب شهرستان دلیجان، حدود 80 کیلومتری جنوب‌شرقی اراک واقع شده‌ است. کانی سازی به‌شکل رگه ای با ماهیت دیرزاد، در سنگهای ‌میزبان کربناتی و شیلی سازند شمشک و بادامو به سن ژوراسیک زیرین تا بالایی روی داده است. فلوریت و باریت فراوانترین کانیهای سازنده کانسنگ هستند و کانیهای فرعی شامل کوارتز، کلسیت، دولومیت، گالن و کالکوپیریت هستند. شواهد به‌دست آمده از بررسیهای میکروترمومتری نشان می‌دهد، رگه‌های فلوریت- باریت (± سولفید) آتش‌کوه در نتیجه اختلاط اعضای انتهایی یک شورابه Na–K(–Mg–Ca) اولیه و شورابه‌های سازندی غنی از کلسیم با شوری کمتر، ناشی از تبادلات سیال- سنگ بعدی شکل گرفته است. چهار مرحله کانی‌سازی در منطقه آتش‌کوه قابل تشخیص است: 1- تحرک شورابه‌های حوضه‌ای غنی از Na–K از افقهای زیرین؛ 2- اختلاط و رقیق‌شدگی شورابه غنی از نمک با سیالات سازندی با شوری کمتر و تشکیل کانی‌سازی فلوریت- باریت؛ 3- رخ‌داد کربن‌زدایی و افزایش میزان CO2 در محیط و 4- تشکیل بافتهای حفره‌ای و برشی، ناشی از انحلال سنگهای کربناتی.

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ارجاع به مقاله
مقدسیس. ج., طالع فاضلا., & بنی فاطمیع. س. (2016). مطالعه کانی سازی و تحول سیال کانی ساز در کانسار فلوریت- باریت (± سولفید) آتش‌ کوه، جنوب دلیجان. زمین‌شناسی اقتصادی, 8(1), 167-180. https://doi.org/10.22067/econg.v8i1.41993
نوع مقاله
علمی- پژوهشی