شیمی‌کانی و زمین دماسنجی اسفالریت و گالن در ذخیره فراگرمایی چنگوره، شمال غرب تاکستان-رهیافتی بر نوع کانی سازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تبریز

2 شرکت زمین فن آوران پویا

چکیده

ذخیره چنگوره در  25 کیلومتری شمال غرب تاکستان، در پهنه فلززائی ترشیاری طارم سفلی واقع است. تزریق نفوذی­های مونزوگرانیتی تا گرانودیوریتی به درون مجموعه آندزیتی- داسیتی ائوسن در منطقه سبب ایجاد دگرسانی گرمابی گسترده آرژیلی و سیلیسی و کانی­زائی رگه-رگچه­ای درون­زاد سولفیدی گالن، اسفالریت، پیریت و به ندرت کالکوپیریت و تتراهدریت- تنانتیت بهمراه کانی­های ثانویه برون­زاد سولفاتی (آنگلزیت)، کربناتی (سروزیت، مالاکیت، آزوریت)، سولفیدی (کوولیت) و اکسیدی (هماتیت،‌گوتیت) در پهنه اکسیدان شده است. در این پژوهش از زمین شیمی و زمین دماسنجی اسفالریت و گالن برای تعیین شرایط سولفیدشدگی، دمای سیال کانه­دار و نوع کانی­زایی استفاده شده است. حضور دو نسل گالن) رگچه­ای برشی شده الف دما بالا دربردارنده میانبارهای تتراهدریت و ب) دما- پایین همراه با اسفالریت کلوفرمی از ویژگی­های کانی­شناسی شاخص این ذخیره بشمار می­آید. براساس بررسی­های شیمی کانی نمونه­های اسفالریت چنگوره، متوسط تراکم عناصر Cd، Ga و Ge در شبکه اسفالریت به ترتیب 5870، 970 و
ppm 1380 است و میانگین نسبت­های Zn/Cd و Ga/Ge به ترتیب 4/165 و 39/1 بدست آمد. زمین دماسنج Ga/Ge در اسفالریت نیز دمای سیال کانه­دار را در گستره oC 220-170 نشان می­دهد. محاسبه log aS2 سیال گرمابی (5/11 - تا 5/13-) براساس درصد مولی FeS (80/0-33/0)، شرایط سولفیدشدگی متوسط را برای ذخیره گرمابی چنگوره پیشنهاد می­کند. با توجه به نتایج زمین دماسنجی Sb/Bi گالن و زمین­شیمی اسفالریت [مجموع گوگرد احیا ∑Sred نسبتاً پایین، تراکم متوسط Cd (ppm5870) و نسبت میانگین Zn/Cd (4/165)[ شرایط فیزیکوشیمیایی و ترمودینامیکی سیال کانه­دار در ذخیره چنگوره با ذخایر فراگرمایی دما-متوسط تا بالا همخوانی دارد.     

کلیدواژه‌ها


عنوان مقاله [English]

The Mineral chemistry and Geothermometry of Sphalerite and Galena in Changoreh epithermal deposit, NW of Takestan: implication to type of mineralization

نویسندگان [English]

  • Kamal Siahcheshm 1
  • Laila Alijani 1
  • Ali Asghar calagari 1
  • Behrouz Ahin 2
1 University of Tabriz
2 Zamin Fanavarn Poya Co
چکیده [English]

The study area is located about 25 km northwest of Takestan city, within Tarom-e-Sofla metallogenic belt. This area is covered by a widespread Eocene andesite to dasite volcanic rocks affected by Oligo-Miocene monzogranite to granodiorite igneous bodies which altered them to silicic, argillic zones as long as hypogene sulfide vein-veinlet mineralization (e.g. galena, sphalerite, pyrite, rare chalcopyrite and tetrahedrie- tennantite) occurred along with supergene minerals (e.g anglesite, cerussite, malachite, covellite and goethite in oxide zone). This study concentrated on geochemistry and geo-barometry of sphalerite and galena to evaluate sulfidation state, temperature and type of ore formation. During mineralography studies, two types of galena were recognized: 1) high temperature, brecciated veinlet type including tetrahedrite and, 2) low temperature coarse grained type along with colloform sphalerite. Based upon mineral chemistry of sphalerite, average concentration of Cd, Ga, Ge, Zn/Cd and Ga/Ge ratios were 5870, 970, 1380, 165.4 and 1.39, respectively. Ga/Ge ratios of sphalerites geothermometry indicate that the formation temperatures of sphalerite are between 170°C and 220°C. The amount of log aS2 hydrothermal fluid (-11.5 to -13.5), calculated from FeS content (0.33-0.80 mol%) in sphalerite, can be attributed to moderate sulfidation state for changoreh deposit. According to Sb/Bi in galena geo-thermometer, geochemistry of sphalerite (low ∑Sred activites, moderate Cd content (5870 ppm) and average Zn/Cd ratio (165.4), physico-chemical and thermodynamics of ore-bearing fluid in Changoreh is in accordance with moderate to high temperature epithermal deposits.

کلیدواژه‌ها [English]

  • Sphalerite
  • galena
  • Ga/Ge
  • Zn/Cd
  • geothermometrery
  • Changoreh
  • Takestan
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