کانسار مس رگه‌ای رشیدی، شمال‌خور، شرق ایران: مطالعات دگرسانی، کانی‌سازی، ژئوشیمیایی، میان‌بارهای سیال و ایزوتوپ‌های پایدار

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دکترا، گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

2 استاد، گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

3 دانشیار، گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

منطقه رشیدی بخشی از محدوده شمال‌خور بوده که در شرق ایران و در فاصله 120 کیلومتری شمال‌غرب‌ بیرجند واقع است. پی‌جویی اولیه در این منطقه به کمک پردازش داده‌های ماهواره‌ای ASTER با استفاده از الگوریتم نقشه‌بردار زاویه طیفی سبب شناسایی پهنه‌های دگرسانی‌ پروپلیتیک، آرژیلیک و اکسیدهای آهن گردید. این گستره‌ شامل برونزدهایی از سنگ‌های آذرآواری متعلق به ائوسن با ترکیب آندزیتی تا ریولیتی می‌باشد که توسط دایک دیوریت‌پورفیری قطع شده‌اند. کانی‌سازی مس رگه‌ای در راستای سیستم شکستگی در واحد توف برش آندزیتی شکل گرفته است. کانی‌سازی رگه‌ای در دو مرحله شکل گرفته‌است که شامل: 1- کوارتز، پیریت، کالکوسیت و تنانتیت و 2- کوارتز، کالکوسیت، پیریت، اسفالریت می‌باشد. محدوده مقادیر δ18O اندازه‌گیری شده بر روی دو نمونه کوارتزی مربوط به مرحله اول و دوم کانی‌سازی به ترتیب 26/19 و 94/14 ‰ و δ18O سیال گرمابی در تعادل با کوارتز بر پایه دما به ترتیب 96/10 و 94/4 ‰ بوده که در محدوده آب‌های ماگمایی بوده و اختلاط با آب‌های جوی در مرحله دوم را آشکار می‌کند. بر پایه مطالعات زمین‌شناسی، ژئومتری رگه‌ای، داده‌های میان‌بارهای سیال و ایزوتوپی پایدار، کانسار مس رشیدی را می‌توان در رده کانسارهای مس رگه‌ای طبقه بندی نموده که در طول پهنه‌های گسلی تشکیل شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Rashidi copper vein deposit, North Khur, Eastern Iran: hydrothermal alteration, mineralization, geochemistry, fluid inclusion and stable isotope investigations

نویسندگان [English]

  • Maryam Javidi Moghaddam 1
  • M.H Karimpour 2
  • Azadeh Malekzadeh Shafaroudi 3
1 P.h.D., Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
2 Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
3 Associate Professor, Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

The Rashidi area, which comprises a part of the north Khur in eastern Iran is located at 120 km northwest of Birjand city. Preliminary prospecting in the area using the image processing of ASTER data by Spectral Angle Mapper (SAM) algorithm resulted in the identification of propylitic and argillic alteration zones together with iron oxy-hydroxide minerals. The area consist of outcrops of Eocene pyroclastic rocks ranging from andesitic to rhyolitic in composition, intruded by diorite porphyry dikes. Vein mineralization in the area was mainly occurred along a fracture system hosted by andesitic tuff breccia unit. Vein copper mineralization was formed during two stages including the: (1) quartz-pyrite-chalcocite-tennantite assemblage, and (2) quartz-chalcocite-pyrite-sphalerite assemblage. The values of δ18O for quartz in the first and second stages of vein mineralization was 19.26 and 14.94 and the amount of δ18O water in equilibrium with quartz was 10.96 and 4.94 respectively that shows a magmatic origin and mixing with meteoric water in the second stage. Based on geology, vein geometry, fluid inclusion, and stable isotope geochemistry, the Rashidi Cu deposit can be classified as vein-type copper deposits, which has been formed along fault zones.

کلیدواژه‌ها [English]

  • Mineralization
  • Fluid inclusion
  • Stable isotope
  • Rashidi
  • Lut block
کتابنگاری

آقانباتی، س.ع.، 1383- زمین­شناسی ایران، سازمان زمین­شناسی و اکتشافات معدنی کشور، 586 ص.

لطفی، م.، 1374- نقشه زمین­شناسی سارغنج، مقیاس 100000/1، انتشارات سازمان زمین­شناسی و اکتشافات معدنی کشور.

 

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