کانی‌شناسی، زمین شیمی و شرایط تشکیل کانسار مس بند‌قیچی منطقه ترود، جنوب شاهرود

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی شاهرود

چکیده

کانسار مس بندقیچی در کرانه شمالی پهنه ساختاری ایران مرکزی، 120 کیلومتری جنوب شاهرود و 70 کیلومتری جنوب شرق ترود واقع است. کانی­سازی مس همراه با واحدهای سنگی از جمله ماسه­سنگ، کنگلومرا و لای سنگ با سن الیگوسن رخنمون دارند. کانه‌زایی به صورت چینه‌کران (روزادی)، چینه­سان (همزادی) و برونزادی (فرآیندهای سطحی) صورت گرفته است.کانی­های اصلی تشکیل‌دهنده کانسار شامل کانی­های سولفیدی (کالکوسیت، کوولیت، بورنیت، کالکوپیریت و پیریت) و کانی‌های کربناته (مالاکیت و آزوریت) هستند. کانی­سازی اصلی در پهنه احیایی و در بخشی از سازندهای قرمز رنگ تشکیل می­شود و توسط نفوذپذیری، مقدار مواد آلی و سولفیدها در سنگ میزبان کنترل می­شود. براساس بررسی­های زمین شیمیایی، ماسه‌سنگ‌های منطقه خاستگاه فلسیک تا حدواسط دارند. عنصر مس در بین فلزات پایه دارای بالاترین مقدار ضریب تولید بوده است (4 تا 8 درصد وزنی) و بیشترین همبستگی را با نقره نشان می­دهد. با توجه به گسترش گدازه­های آندزیتی ائوسن در منطقه مجاور کانسار و حضور قطعات آتشفشانی دربردارنده کانی­های مس­دار در واحدهای کنگلومرایی میزبان می­توان خاستگاه مس در منطقه را به واحدهای آتشفشانی نسبت داد. با توجه به ویژگی­های اساسی کانسار مس بندقیچی از جمله سنگ میزبان، کانی‌شناسی، ساخت و بافت، عناصر همراه، محیط ته­نشست و عوامل مؤثر در کانه­زایی می­توان این کانسار را یک کانسار مس با میزبان رسوبی و از نوع لایه قرمز در نظر گرفت.     

کلیدواژه‌ها

عنوان مقاله [English]

Mineralogy, geochemistry and conditions of formation of The Band -e- GhichyCopper-Celestite deposit Torud area, South of Shahrood

نویسندگان [English]

  • Somayeh Salehinasab
  • Farajoallah Fardoost
  • Afsaneh Soltani
چکیده [English]

Band-e-Ghichy copper deposit is located in the northern margin of the Central Iran structural zone, about 120 km south of Shahrood and 70 km south east of Torud. Copper mineralization occurred in the rock units including sandstone, conglomerate and siltstone with the Oligocene age. Mineralization has occurred in the form of stratiform (syngenetic), stratabound (epigenetic) and supergen (the surface processes). The minerals forming the deposit include sulfide (chalcocite, covellite, bornite, chalcopyrite and pyrite) and carbonate (malachite and azurite) minerals. The main mineralization forms in the reduction zone as well as in the red formations and is controlled by permeability, the content of organic materials and sulfides in the host rock. Due to the expansion of Eocene andesitic lavas in the adjacent area of the deposit and the presence of volcanic fragments containing copper-bearing minerals in host conglomerate units, it can be concluded that the source of copper in the region is attributed to volcanic units. Based on geochemical studies, sandstone of the region have a felsic to intermediate source rocks and the copper element in the base metals has the highest production coefficient (4 to 8 weight percent) and shows the highest correlation with silver. According to the basic characteristics of Band-e-Ghichy copper deposit such as host rock, mineralogy, structure and texture, companion elements, depositional environment and important mineralization factors, this deposit can be considered as a copper deposit with a sedimentary host and red bed type.

کلیدواژه‌ها [English]

  • copper
  • Sandstone
  • Oligocene
  • Red bed
  • Band-e-Ghichy
  • Torud

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  • تاریخ دریافت: 06 شهریور 1397
  • تاریخ بازنگری: 07 آبان 1397
  • تاریخ پذیرش: 07 آذر 1397

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