نقش پهنه های برشی راستالغز و شکستگی های مرتبط با چین خوردگی در تکوین کانسار طلای زرشوران، همتافت تخت سلیمان، شمال تکاب

زمین شناسی اقتصادی

مقاله 1، دوره 12، شماره 2 - شماره پیاپی 25، 1399، صفحه 131-155   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v12i2.75702

نویسندگان

رضا علی پور^* ؛ ابراهیم طالع فاضل؛ مهدی فرهانی مقدم

دانشگاه بوعلی سینا

چکیده

کانسار طلای زرشوران در همتافت تکاب در شمال ­باختر ایران و در یال باختری طاقدیس ایمان­ خان با راستای شمال‌باختری-‌جنوب‌خاوری واقع‌شده است. واحدهای شیل سیاه زرشوران و آهک چالداغ با سن پرکامبرین مهم ­ترین میزبان­ های کانی‌سازی در منطقه هستند که دگرسانی­ های سیلیسی (ژاسپروئیدی)، کربنات ­زدایی، دولومیتی و آرژیلیک، کانه ­زایی را همراهی می­ کنند. استخراج خط‌ واره‌ها و تحلیل‌های فرکتالی شکستگی‌ها و خط‌ واره‌ها نشان می ­دهد که غلظت طلا در مناطق با تراکم بالای شکستگی، مقادیر متغیری (کمینه 5 تا بیشینه 10 میلی‌گرم در تن) دارد. بیشترین فراوانی روند خط‌ واره‌ها و گسل­ های منطقه مورد بررسی به ­ترتیب N20E  تا N75E درجه و بیشترین فراوانی روند گسل‌ها N30E  تا N85E درجه است. گسل تکاب با راستای شمال­ باختری-‌جنوب­ خاوری مه م­ترین ساختار در منطقه است که عملکرد راستالغز جوان آن باعث ایجاد ساختارهای کششی و فشارشی شده است. طاقدیس ایمان‌خان یکی از این ساختارهاست که شکستگی‌های آن محلی مناسب برای اختلاط سیالات جوی و گرمابی حاوی فلز و ته‌نشینی طلا را فراهم‌کرده است. کانی‌سازی در این طاقدیس بیشتر در محل تقاطع شکستگی‌ها و در راستای شکستگی‌های طولی با روند شمال‌باختر-‌جنوب‌خاور و ناشی از تحدب کمان خارجی طاقدیس صورت‌گرفته است.

کلیدواژه‌ها

کانسار؛ تاقدیس؛ فرکتال؛ طلا؛ گسل تکاب؛ زرشوران

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