شیمی کانی‌های سولفیدی و سولفوسالتی در کانسار باریت (طلا- نقره) چشمه نقره، زیر پهنه سبزوار، شمال غرب کاشمر

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه تربیت مدرس

چکیده

کانسار باریت (طلا-نقره) چشمه نقره در 20 کیلومتری شمال غرب کاشمر، در زیرپهنه سبزوار واقع است. واحدهای سنگی منطقه کانسار از یک توالی از واحدهای آتش‌فشانی- رسوبی ائوسن شامل توف سنگی، توف ریولیتی، شیل توفی، لاپیلی توف و آگلومرا همراه با گدازه­های با ترکیب پیروکسن آندزیت و تراکی آندزیت تشکیل شده­اند. در این کانسار، باریت به­صورت عدسی، توده­ای، نواری و رگه- رگچه­ای در واحد توف ریولیتی شکل گرفته است. باریت­های عدسی- توده­ای و نواری­شکل دربردارنده کانه­های فلزی شامل پیریت، اسفالریت، کالکوپیریت، گالن، تترائدریت، آرژانتیت و الکتروم هستند­. همراهی کانی‌های سولفیدی با باریت نشان‌دهنده شرایط زیراکسیدی در زمان نهشت کانسنگ است. در این پژوهش، شیمی کانی­های سولفیدی موجود در کانسنگ‌های عدسی شکل باریتی با ریزپردازشگر الکترونی (EPMA) بررسی شد. بر این اساس، گستره باریک و مقدار پایین آهن درون اسفالریت با کانه­زایی در یک محیط زیراکسیدی همخوانی دارد. حضور عناصر سنگین چون طلا و نقره درون پیریت نشان می‌دهد که پیریت‏ها در یک محیط زیراکسیدی تشکیل شده و آرسنیک موجود درون پیریت به‌صورت یون فلزی (As3+) جانشین آهن شده است. حضور مقادیر فراوان آنتیمون، بیسموت، آرسنیک و نقره در همه کانی­های سولفیدی و سولفوسالتی کانسار چشمه نقره نشان می­دهد که سیال فلزدار سازنده کانسار چشمه نقره غنی از این عناصر فلزی بوده است.

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry of sulfide and sulfosalt minerals in the Cheshmeh-Noghreh barite (gold- silver) deposit, Sabzevar subzone, NE Kashmar

نویسندگان [English]

  • Qafuri Sedehi
  • Tajeddin
  • Rastad
  • Mahmoodi Qafuri
چکیده [English]

The Sebandoon Barite (gold-silver) deposit is located about 20 km NW of the Kashmar in the Central Iran. The rock units exposed in the area consist of Eocene volcano-sedimentary sequences of lithic tuff, rhyolitic tuff, tuffaceouce shale, lapilli tuff and agglomerate associated with pyroxene andesite and trachyandesite. The barite is composed of lenticular, banded and stockwork mineralization and that is hosted in rhyolithic tuff. Lenticular, massive and banded barite contains pyrite, sphalerite,chalcopyrite, galena, tetrahedrite, argentite and electrum. The association of sulphide minerals with the barite indicates sub-oxic conditions during ore forming processes. In this study, the chemistry of sulfide minerals in the barite lenses was studied using Electron Microscope. Accordingly, the narrow range and low iron content within the sphalerite are similar to those of mineralization in a sub-oxic environments. The presence of elements with heavy atomic nuclei, such as gold and silver, in the pyrite indicates that the pyrites are formed in a sub-oxic environment and arsenic in the pyrite is replaced by metal (As3 +). The presence of large amounts of antimony, bismuth, arsenic, and silver in the sulfide and sulfosalt minerals of this deposit indicates that the ore forming fluid was rich in the metal elements.

کلیدواژه‌ها [English]

  • Cheshmeh Noghreh deposit
  • Barite
  • gold-rich massive sulfide
  • Mineral chemistry

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مجله بلورشناسی و کانی شناسی ایران
دوره 30، شماره 1 - شماره پیاپی 85
فروردین 1401
صفحه 119-128

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سابقه مقاله

  • تاریخ دریافت: 26 اردیبهشت 1400
  • تاریخ بازنگری: 29 تیر 1400
  • تاریخ پذیرش: 30 مرداد 1400

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