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کانهزایی اپی ترمال فلزهای پایه و گران بهای نوع سولفیداسیون حدواسط در کانسار قبچاق (شمال غرب قره چمن، آذربایجان شرقی): شواهد زمین شناسی، کانه زایی و زمین شیمی | ||
زمین شناسی اقتصادی | ||
دوره 15، شماره 1 - شماره پیاپی 36، اردیبهشت 1402، صفحه 53-85 اصل مقاله (3.72 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22067/econg.2022.75340.1041 | ||
نویسندگان | ||
محمد صحبتلو1؛ حسین کوهستانی* 2؛ میر علی اصغر مختاری2 | ||
1کارشناسیارشد، گروه زمینشناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران | ||
2دانشیار، گروه زمینشناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران | ||
چکیده | ||
کانهزایی فلزهای پایه و گرانبها در کانسار قبچاق به صورت رگههای برشی کوارتز- سولفیدی درون توالی توف و گدازه ائوسن و توده کوارتزدیوریت- گابرو الیگوسن رخداده است. پیریت، کالکوپیریت، گالن، اسفالریت و طلا همراه با اندکی رآلگار، پسیلوملان و پیرولوزیت، کانههای فلزی و کوارتز، سریسیت، کلریت و کلسیت کانیهای باطله هستند. بافتهای کانسنگ شامل دانهپراکنده، رگه- رگچهای، بِرشی، شانهای، کاکلی، گلکلمی، پوستهای، پرمانند و پُرکننده فضای خالی است. پنج مرحله کانهزایی در قبچاق قابل تشخیص است. مرحله اول کانهزایی با سیلیسیشدن سنگهای میزبان همراه با اندکی پیریت دانهپراکنده مشخص میشود. مرحله دوم شامل رگه- رگچههای کوارتزی و بِرشهای گرمابی است که حاوی مقادیر متغیری پیریت، کالکوپیریت، گالن، اسفالریت، ± طلا ± رآلگار هستند. مرحله سوم با کوارتز و اکسیدها- هیدروکسیدهای منگنز (پسیلوملان، پیرولوزیت و براونیت) در رگهها و سیمان گرمابی بِرشها قابل تشخیص است. مرحله چهارم شامل رگه و رگچههای کوارتز (کلسیت- کلریت) و مرحله پنجم شامل کلسیت با بافتهای رگچهای و پرکننده فضاهای خالی است. دگرسانیهای گرمابی شامل سیلیسی، آرژیلیک متوسط، کربناتی، کلریتی و پروپلیتیک است. الگوی عناصر کمیاب و کمیاب خاکی بهنجارشده به کندریت برای نمونههای کانهدار و سنگهای میزبان، مشابه و بیانگر نقش این سنگها در تأمین عناصر کانهساز است. ویژگیهای کانسار قبچاق با کانسارهای اپیترمال نوع سولفیداسیون متوسط قابل مقایسه است. | ||
کلیدواژهها | ||
کانه زایی اپی ترمال؛ فلزات پایه و گران بها؛ سولفیداسیون متوسط؛ قبچاق؛ قره چمن | ||
مراجع | ||
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