بررسی‌های زمین‌شناسی و ایزوتوپی در ارتباط با کانی‌زایی مس در منطقه درخت سنجد، استان خراسان رضوی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین شناسی، دانشگاه پیام نور، تهران، ایران

2 گروه مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی

چکیده

منطقه درخت سنجد در فاصله حدود 160 کیلومتری جنوب­غرب مشهد و در 40 کیلومتری جنوب نیشابور واقع است. سنگ میزبان کانی­زایی منطقه واحدهای آتشفشانی بویژه واحد آندزیت پورفیری با سن ائوسن است و دگرسانی­های عمده موجود در منطقه شامل کربناتی­شدن از درجه­های ضعیف تا قوی، پروپیلیتی و سیلیسی شدن هستند. کانی­زایی مس در این منطقه بیشتر به­صورت مالاکیت، آزوریت، کالکوپیریت، بورنیت، دیجنیت، کالکوسیت، کوولیت و آتاکامیت بوده است و ساخت و بافت عمده موجود در واحدهای دارای کانسنگ به صورت رگه-رگچه­ای، پرکننده حفره­ها، جانشینی و بافت پراکنده دیده می­شود. بررسی­های ایزوتوپی گوگرد انجام شده بر نمونه­های کالکوسیت در این منطقه مقادیر 7- تا 1/9- در هزار را نشان می­دهد. کانی­زایی در منطقه درخت سنجد بیشترین شباهت را به کانسارهای نوع مانتوی شیلی دارد، ولی کانی­زایی درخت سنجد را بر اساس شواهد روزادی بودن آن و همچنین داشتن کانی­های سولفیدی اصلی اولیه که به‌طور عمده کالکوسیت است و نیز نبود پیریت و کانی‌های دارای آهن، وجود دگرسانی کربناتی و تشکیل آن در اعماق کم، می­توان یک کانسار گرمابی با سولفیدشدگی و آهن پایین در نظر گرفت.

کلیدواژه‌ها

عنوان مقاله [English]

Geological and isotopic studies related to copper mineralization in Derakht-e Senjed area, Khorasan-e Razavi Province

نویسندگان [English]

  • Azam entezariharsini 1
  • Rahim Masoumi 2
  • Tohid Nouri 2
1 Department of Geology, Payame Noor University, PO Box 19395-3697, Tehran, Iran
2 3Faculty of Engineering, University of Mohaghegh Ardabili
چکیده [English]

The Copper mineralization in Derakht-e Senjed area is mainly observable in oxide phase and in some parts in sulfide phase. The host rock of the mineralization is volcanic, especially andesite porphyry unit and the main alterations of the area include carbonatic from weak to strong degrees, propylitic and silicified. The copper mineralization in this area is mainly seen in the forms of malachite, azurite, chalcopyrite, bornite, digenite, chalcocite, covellite and atacamite. The main structures and textures in the ore-bearing units are vein-veinlet, space-filling, and scattered texture. The performed sulfur isotopic studies on chalcocite samples in this area show values from -7 to -9.1 ‰. The mineralization in the Derakht-e Senjed area is mostly similar to Chilean Manto type deposits, however, based on the epigenetic evidences, the presence of main sulfide minerals such as chalcocite as well as the lack of pyrite and iron-containing minerals, the presence of carbonatic alteration and the evidences of the formation at shallow depths, this mineralization can be considered to forms as a low-sulfidation and low-iron hydrothermal deposit.

کلیدواژه‌ها [English]

  • Cu-mineralization
  • Derakht-e Senjed
  • sulfur isotopes
  • andesitic copper
  • Manto-type

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  • تاریخ دریافت: 05 خرداد 1403
  • تاریخ بازنگری: 15 تیر 1403
  • تاریخ پذیرش: 10 مرداد 1403

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