زمین‌شناسی، کانی‌سازی، زمین شیمی و بررسی سیال های درگیر در منطقه اکتشافی مس مشکان، شمال‌شرق سبزوار

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه فردوسی مشهد

چکیده

منطقه اکتشافی مس مشکان در شمال­شرق سبزوار و در جنوب کمربند ماگمایی قوچان-سبزوار واقع است. زمین‌شناسی منطقه شامل واحد آتشفشانی (هورنبلند آندزیت) و واحدهای رسوبی (کنگلومرا، ماسه­سنگ، آهک، شیل و آهک ماسه­ای) به سن ائوسن است. کانی­سازی رگه­ای مس بیشتر با راستای شمال­شرق-جنوب­غرب در واحدهای رسوبی ایجاد شده است. کانی­های اولیه شامل کوارتز، باریت، پیریت، کالکوسیت و بورنیت هستند که در اثر اکسایش به کانی­های مالاکیت، آزوریت، کالکوسیت، کوولیت، گوتیت و هماتیت تبدیل شده­اند.  بیشترین بی­هنجاری­های زمین شیمی در رگه­ها برای مس 6/4 درصد (با میانگین 1/2 درصد)، آرسنیک 100 گرم در تن (با میانگین 1/55 گرم در تن) و آنتیموان 65 گرم در تن (با میانگین 6/28 گرم در تن) است. بر پایه بررسی سیال­های درگیر دو فازی در کانی کوارتز و باریت، کمینه دمای تشکیل کانی‌سازی 170 تا 240 درجه سانتی­گراد و درجه شوری بین 7/10 تا 2/15 درصد وزنی است. کاهش دما و رقیق شدگی توسط آب­های جوی می­توانند مهمترین عوامل ته­نشست سولفید­ها باشند. کنترل ساختاری کانی­سازی، دگرسانی محدود به کناره رگه، دما و شوری کم محلول کانه­دار و کانی­شناسی ساده ذخیره، مشابه کانسارهای رگه­ای فراگرمایی است.

کلیدواژه‌ها

عنوان مقاله [English]

Geology, mineralization, geochemistry and fluid inclusion studies of Mashkan copper prospect area, northeastern Sabzevar

نویسندگان [English]

  • Moradi Navokh
  • Malekzadeh Shafaroudi
  • Javidi Moghaddam
چکیده [English]

Mashkan copper prospect area is located in northeastern Sabzevar and southern Ghochan-Sabzevar magmatic belt. Geology of the area includes Eocene volcanic unit (hornblende andesite) and sedimentary units (conglomerate, sandstone, limestone, shale and sandy limestone). Copper mineralization, as vein-type, mostly occurs with northeast-southwest trend in sedimentary units. Primary minerals include quartz, barite, pyrite, chalcocite, and bornite, which are oxidized to malachite, azurite, chalcocite, covellite, goethite, and hematite. Maximum geochemical anomalies in veins are 4.6% Cu (with an average of 2.1%), 100 ppm As (with an average 55.1 ppm), and 65 Sb ppm (with average 28.6 ppm). On the basis of fluid inclusion studies of quartz and barite, minimum formation temperature for mineralization is 170 to 240ºC with salinity of 10.7 to 13.51 NaCl wt. % equivalent. Decreasing temperature and dilution by meteoric water can be the most important factors for sulfide deposition. Structural control of mineralization, limited alteration to vein margin, low temperature and salinity of fluid inclusions and simple mineralogy are similar to epithermal-type deposit.

کلیدواژه‌ها [English]

  • Mineralization
  • Geochemistry
  • fluid Inclusion
  • Mashkan
  • Sabzevar

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  • تاریخ دریافت: 22 آبان 1398
  • تاریخ بازنگری: 03 بهمن 1398
  • تاریخ پذیرش: 24 اسفند 1398

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