بررسی ژئوشیمیایی کانه زایی رگه ای تنگستن- مس در جنوب-باختری شازند

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشگاه تربیت مدرس، تهران، ایران

2 پایگاه ملی داده‌های علوم زمین کشور، تهران، ایران

چکیده

در جنوب­باختری شازند، دو مورد کانه­زایی رگه­ای تنگستن- مس در محدوده­های نظام­آباد و ده­حسین مشخص شده است. رگه­های گرمابی کوارتز- تورمالین کانه­دار، سنگ­های ­­میزبان­ متفاوتی (گرانیت­بیوتیتی و ماسه­سنگ کم­دگرگونه) دارند. با توجه به شباهت فلزات کانه­ساز (تنگستن- مس- قلع- سرب- روی) در دو محدوده ده­حسین و نظام­آباد، یکسان بودن کانی‌شناسی رگه­ها (کوارتز-تورمالین نوع دراویت) و مشابهت الگوی تغییرات REE در این دو محدوده، می‌توان نتیجه گرفت که رگه­های کانه­دار ده­حسین و نظام­آباد، یک منشأ دارند؛ یعنی هنگامی­که فاز سیال حاوی بور در منطقه فعال بوده است، موجب کانه­سازی نوع رگه­های کوارتز-تورمالین­دار در منطقه شده است. همچنین با توجه به بی­بار بودن توده­های نفوذی موجود در منطقه و دیگر شواهد کانی­شناسی- ژئوشیمیایی به‌دست آمده در این پژوهش، می­توان نتیجه گرفت که تنگستن و دیگر عناصر فلزی در رگه­های کانه­دار نظام­آباد و ده­حسین، منشأ رسوبی/ دگرگونه دارند

کلیدواژه‌ها


عنوان مقاله [English]

Geochemical Study of Vein-Type Tungsten-Copper Mineralization in Southwest of Shazand

نویسندگان [English]

  • M. Abdi 1
  • Majid Ghaderi 1
  • N. Rashidnejad-Omran 1
  • A. Najafi 2
1 Department of Geology, Tarbiat Modares University, Tehran, Iran
2 National Geoscience Database of Iran, Tehran, Iran
چکیده [English]

Two cases of tungsten-copper vein-type mineralization have been studied in the Nezam-abad and Deh-hossein areas, in southwest of Shazand. The hydrothermal quartz-tourmaline mineralized veins have different host rocks (biotitic-granite and meta-sandstone). Considering similar ore metals (tungsten-copper-tin-lead-zinc) in the Nezam-abad and Deh-hossein areas, same mineralogy of veins (quartz-dravite) and similar REE variation patterns in the two areas, it is suggested that the Nezam-abad and Deh-hossein mineralized veins have the same origin. It means, when the Br-bearing fluids were active, they caused the quartz-tourmaline vein-type mineralization in this area. Considering the barren intrusions in the area and other mineralogical-geochemical evidences in this study, it could be concluded that tungsten and other metallic elements in the Nezam-abad and Deh-hossein ore-bearing veins have a sedimentary/metamorphic origin.   

کلیدواژه‌ها [English]

  • Tungsten
  • copper
  • Vein-type
  • Mineralogy
  • Geochemistry
  • origin
  • Nezam-abad
  • Deh-hossein
  • Shazand
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