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علیرضا غیاثوند محمد حسن کریم‌‍‌ پور آزاده ملکزاده شفارودی محمد رضا حیدریان شهری

چکیده

معدن فیروزه در شمال‌‌غرب نیشابور و در شرق کمربند ماگمایی قوچان- سبزوار قرار دارد و از نظر ساختاری جزو بخش غربی زون بینالود است. زمین‌شناسی این منطقه متشکل از گدازه و پيروکلاستيک­‌هايی با سن پالئوسن- ائوسن است که توده­‌های نفوذی نيمه‌عميق با سن ائوسن ميانی در آنها نفوذ كرده­ اند. مهم‌ترين دگرسانی‌هایی که واحدهای آتشفشانی و نفوذي منطقه را تحت تأثير قرار داده شامل سيليسی، آرژيليك و كربناتی است. کانی ­سازی در سطح و تونل‌‌ها در درز و شکستگی‌‌ها اغلب به شکل‌های افشان، استوک­‌ورک، رگه- ‌رگه‌چه و برش گرمابی ديده می­‌شود. کانی‌های اولیه شامل اسپکيولاريت، مگنتيت، پيريت، کالکوپيريت و بورنيت و کانی‌های ثانویه شامل هماتیت، آلونيت، کووليت، فيروزه و لیمونیت هستند. اکتشافات ژئوشيميايی، ناهنجاری‌های عناصر مس (تا ppm 1074)، طلا (تا ppb 699)، آهن (تا 30 درصد)، سریم (تا ppm 464)، لانتانیم (تا ppm 227)، اورانیوم (تا ppm 243) و کبالت (تا بیش از ppm 10000) را نشان می‌دهد. بر مبنای بررسی‌های سیالات درگیر، دمای تشکیل کانسار بین 147 تا 278 درجه سانتی‌گراد با میانگین 203 درجه سانتی‌گراد بوده و از محلولی شامل نمک‌های KCl، CaCl2، MgCl2 و NaCl با درجه شوری بین 56/5 تا 08/17 درصد وزنی معادل نمک طعام به‌وجود آمده است. فرایند اختلاط بین محلول ماگمایی گرم و شور با محلول سرد و کم‌شور جوی و نیز فرایند جوشش توانسته است باعث ته‌نشینی عناصر شود. این کانسار منشأ ماگمایی- گرمابی دارد و مرتبط با فعالیت‌های ماگماتیکی ترشیری وابسته به زون فرورانش ورقه اقیانوسی نئوتتیس سبزوار به زیر صفحه توران است. بررسی‌های زمين‌شناسی، دگرسانی، کانی‌سازی، ژئوشيمی، ژئوفیزیکی و سیالات درگیر در معدن فیروزه نيشابور نشان‌دهنده حضور کانی­‌سازی بزرگی از نوع اکسید آهن مس- طلا- اورانیوم- عناصر نادر خاکی سبک مشابه با بخش هماتیت‌- غالب کانسار IOCG المپیک دم است.

جزئیات مقاله

کلمات کلیدی

کانی سازی, اکتشافات زمین‌ شیمیایی, سیالات درگیر, اکسید آهن مس- طلا, معدن فيروزه نیشابور

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ارجاع به مقاله
غیاثوندع., کریم‌‍‌ پورم. ح., ملکزاده شفارودیآ., & حیدریان شهریم. ر. (۱۳۹۷-۱۲-۱۸). دگرسانی، کانی سازی، زمین‌ شیمی و مطالعه سیالات درگیر در معدن فیروزه، شمال‌ غرب نیشابور. زمین‌شناسی اقتصادی, 10(2), 325-354. https://doi.org/10.22067/econg.v10i2.62579
نوع مقاله
علمی- پژوهشی