زمین شناسی، سنگ شناسی و زمین شیمی دگرسانی ذخیره مس پرداد، شرق شاهرود

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

چکیده

ذخیره مس پرداد در نوار آتشفشانی-رسوبی ترشیاری عباس‌آباد-کاهک در جنوب نوار افیولیتی سبزوار و در لبه شمال شرقی ایران مرکزی واقع است. برونزد واحدهای سنگی سنوزئیک شامل آندزیت، بازالت، توف­های ریولیتی، آگلومرا و توده­های نیمه نفوذی (تونالیتی تا کوارتز مونزونیتی) گستره وسیعی از منطقه را پوشانده است که بطور موضعی یا کامل دچار دگرسانی­های پروپیلیتیک، سریسیتیک و هماتیتی شده­اند. موازنه جرم در نمونه­های با دگرسانی پروپیلیتیک اشاره به غنی‌شدگی Fe2O3، MgO، CaO و مس دارد که با حضور سولفیدهای مس‌دار به همراه کلسیت و اپیدوت همخوانی دارد. در پهنه سریسیتی، اکسیدهای CaO، K2O، Na2O، MgO، MnO، P < sub>2O5 و عناصر جزئی Ba، Sr، Rb، Hf، Ta، W، Cr دچار کاهش جرم شده­اند که ناشی از کلریتی­شدن کانی‌های فرومنیزین و تخریب فلدسپار است. تهی­شدگی عناصر خاکی نادر سنگین (HREE)ها در پهنه دگرسانی پروپیلیتیک می­تواند به علت کمپلکس‌های کلریدی و غنی‌شدگی جزئی عناصر خاکی نادر سنگین (LREE)ها به دلیل جذب سطحی توسط کانی‌هایی چون کلریت، اپیدوت و اکسیدهای آهن باشد. غنی­شدگی از LREEها در دگرسانی سریسیتیک ناشی از تثبیت این عناصر در کانی‌های اولیه آپاتیت، اسفن و زیرکن است. افزایش عناصر Co، Ni Cr، V، Ag  و As در پهنه هماتیتی می­تواند ناشی از پدیده جذب سطحی فلزها بر سطوح کانی‌های اکسیدی آهن باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Geology, petrology and geochemical alteration of Pardad copper deposit, East Shahrood

نویسندگان [English]

  • Saeed Mushtaq
  • Kamal Siahcheshm
  • Mohamad Reza Hosseinzadeh
Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
چکیده [English]

The Pardad copper deposit lies in the Tertiary volcanic-sedimentary zone of the Abbas Abad-Kahak, south of the Sabzevar ophiolitic belt on the northeastern margin of the Central Iran. It comprises of a widespread Eocene andesite, basalt, rhyolitic tuffs and agglomerate volcanic rocks affected by the intrusion and semi-intrusive bodies (e.g., tonalitic to monzonitic quartz), which altered them to propylitic, sericitic and hematitic alteration zones. The mass balance findings indicate an enrichment of Fe2O3, MgO, CaO and copper, in the propylitic alteration samples which is in agreement with the presence of copper sulfides along with calcite and epidote. In the sericitic zone, the amount of CaO, K2O, Na2O, MgO, MnO, P < sub>2O5 and elements of Ba, Sr, Rb, Hf, Ta, W, Cr have decreased, which is the result of chloritization of ferromagnesian minerals and destruction of feldspar. Depletion of HREEs in the propylitic alteration zone can be due to chloride complexes and partial enrichment of LREEs due to surface absorption by minerals such as chlorite, epidote and iron oxides. Meanwhile, the enrichment of LREEs in the sericitic alteration zone is linked to the stabilization of these elements in primary minerals like apatite, sphene, and zircon. The hematite zone exhibits  elevated levels of Co, Ni, Cr, V, Ag, and As elements, a phenomenon attributed to the surface absorption of metals on iron oxide mineral surfaces.

کلیدواژه‌ها [English]

  • Mass balance
  • rare earth elements
  • alteration
  • Sabzevar zone
  • Pardad

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  • تاریخ دریافت: 15 آبان 1402
  • تاریخ بازنگری: 20 آذر 1402
  • تاریخ پذیرش: 14 بهمن 1402

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