سنگ‌نگاری و زمین‌شیمی سنگ‌های آذرین و بررسی آثار کانی‌سازی در نهشته معدنی چاه‌میخ، جنوب‌غرب بیرجند-خراسان جنوبی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه بیرجند

چکیده

منطقه چاه­میخ بخشی از قطعه لوت است که در 115 کیلومتری جنوب غرب بیرجند قرار دارد. سنگ های منطقه مورد بررسی، آندزیت، پیروکسن­آندزیت، هورنبلند­آندزیت و هورنبلند­پیروکسن­آندزیت، دیوریت پورفیری، مونزودیوریت پورفیری و بازالت­ هستند. بافت غالب توده­ها پورفیری است. در بخش مرکزی منطقه مورد بررسی، پهنه‌های دگرسانی بسیار گسترده بوده و در ارتباط مستقیم با توده­های نیمه‌عمیق هستند غنی­شدگی عناصر خاکی نادر سبک (LREE)، تهی شدگی نسبی عناصر خاکی نادر سنگین (HREE) و ناهنجاری منفی Eu از ویژگی های آنها بوده و بیانگر فعالیت ماگمایی متاآلومین نوع I کرانه فعال قاره­ و صفحه های آتشفشانی هستند. کانه­زایی در این منطقه در رگه­های سیلیسی- برشی ناشی از عملکرد استوک های نیمه عمیق است. از نظر کانی­شناسی، کانی‌های سولفیدی اصلی موجود در منطقه عبارتند از پیریت نسلI، پیریت نسل II، کالکوپیریت، کالکوسیت و کوولیت و از میان کانی‌های فاز اکسیدی می توان به مالاکیت، آزوریت، کریزوکلا، نئوتاسیت، هماتیت و گوتیت اشاره کرد.    

کلیدواژه‌ها


عنوان مقاله [English]

Petrography and geochemistry of igneous rocks and study of mineralization effects in Chah-Mikh mineral index, southwest of Birjand-South Khorasan

نویسندگان [English]

  • Sanighalhar
  • Yousefzadeh
  • Mahdavi
چکیده [English]

Chah Mikh area is a part of Lout blocks in 115 kilometers south west of Birjand. Stones in the studied district are Andesite, pyroxene – Andesite, Porphyry Diorite, Hornblende Andesite, Hornblende-Pyroxene, Monzodiorite , and Basalt. The texture of the most masses is Porphyritic. In central part of the studied area there are many extensive alteration zones which are directly related to semi-deep masses. Richness of light rare earth element, partial emptiness of heavy rare earth elements and the negative anomaly are their specialities and it represents Metalumina Magmatism types 1 in the active border of the continent and volcanic plates. Mineralization in this area in silic beefs arises from the action of the semi-deep stock. In terms of mineralogy original sulfide mineral existed in the area are Pyrite generation 1 Pyrite generation 2, Chalcopyrite, Chalcocite, Covellite and among the oxide phase mineral: Malachite Azurite, Chyrsocolla, Hematite and Goethite can be mentioned.
 

کلیدواژه‌ها [English]

  • Andesite
  • Geochemistry
  • alteration
  • Mineralization
  • Chahmikh
  • Birjand
  • Lut block
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