بررسی‌های کانه‌زایی، سیال‌های درگیر، زمین‌شیمی و تفسیر داده‌های زمین‌فیزیکی مقاومت ویژه الکتریکی/قطبش القایی منطقه فریزی، شمال شرقی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه فردوسی مشهد

چکیده

منطقه­­ پی­جویی سرب- روی- مس فریزی در شمال غرب مشهد، در استان خراسان رضوی واقع است. کانی­سازی به شکل رگه­ای در سنگ میزبان اسلیت با میان لایه­های فیلیت و ماسه سنگ­کم­دگرگون شده تریاس پسین- ژوراسیک پیشین (معادل سازند شمشک) تشکیل شده است. تنها دگرسانی سنگ میزبان سیلیسی­شدن است. کانی­سازی اولیه کوارتز، گالن، کالکوپیریت، پیریت و کانی­های ثانویه هماتیت، گوتیت، لیمونیت، کوولیت، مالاکیت و آزوریت است. مقدار سرب در رگه­ها تا %7/3، روی تا %6/1، مس تا %4 و نقره تا %0183/0 است. اندازه­گیری­های ریز­­دماسنجی در سیال­های درگیر دو­فازی (مایع و بخار) نشان می­دهد که کوارتز و کانه­ها از یک سیال با دمای متوسط تا بالا (200 تا 347 درجه سانتیگراد) و شوری نسبتاً بالا (2/20 تا 35/22 درصد وزنی) که احتمالاً آب دگرگونی است، ریشه گرفته است. کاهش دما مهمترین نقش را در کانی­سازی سرب- روی- مس داشته است. داده­های مقاومت ویژه الکتریکی/ قطبشی القایی (IP/RS) در محل پهنه­های گوسان، رگه­ها، کنده­کاری­های قدیمی و ناهنجاری­های زمین­شیمی، افزایش بارپذیری را نشان می­دهد. سه بخش (A, B, C) کانی­سازی در منطقه وجود دارد. بخشB  از نظر کانی­سازی، ناهنجاری زمین­شیمی و بار­پذیری نسبت به  Aو C دارای اهمیت بیشتری است. بررسی مغزه­های حفاری بر ناهنجاری بالای شبه مقطع IP/RS در بخش B، وجود ذغال گرافیتی در سنگ میزبان را تایید کرد که منبع ایجاد کننده ناهنجاری است. بر اساس زمین­شناسی، کانی­سازی و ویژگی سیال­های درگیر، نوع کانی­سازی فریزی رگه­ای نوع کوهزایی است. خاستگاه فلزات کانه­ساز در منطقه فریزی احتمالاً همان لایه­های غنی از گرافیت بوده و طی فاز کوهزایی ژوراسیک میانی- سیمرین میانی، توسط آب­های دگرگونی حمل شده و در فضا­های ساختاری مناسب بر­جای گذاشته شده است.      

کلیدواژه‌ها

عنوان مقاله [English]

Mineralization, fluid inclusion and geochemical studies and interpretation of IP/RS data in Freezi prospect area, northeast Iran

نویسندگان [English]

  • mohammadreza Kazempour
  • mohammadreza Hidarian Shahri
  • Azadeh Malekzadeh Shafaroudi
چکیده [English]

Freezi Lead- Zinc- Copper prospect area is located in north east Mashhad in Khorassan Razavi Province. Mineralization was formed in the area as vein type in the host rocks of slate with interlayer of phyllite and meta sandstone of Upper Triassic to Early Jurassic age (equivalent to Shemshak Formation). The only alteration in the host rock is silicification. Primary minerals are quartz, galena, chalcopyrite and pyrite, while secondary minerals are hematite, goethite, limonite, malachite and azurite. The amount of Pb is up to %3.7, Zn is up to %1.6, Cu is up to %4 and Ag 183 ppm. Micro thermometry measurements of two Phases (liquid and vapour) showed that quartz and ores originated from a fluids with mid to high temperature (200 to 347°c) and high salinity (20.2 to 22.35 wt%) which was probably metamorphic liquid. Reduction of temperature of the liquid had greatest importance in Pb, Zn, and Cu mineralization. IP/RS data on the location of Gossan zones, veins, previous digging, and geochemical anomalies showed increasing in chargeability. Mineralization occurred in three part (A, B, C) in the area. In view of mineralization, geochemical anomalies and chargeability in the part B is more important than A and C. Studies of drill cores over the psedousection IP/RS anomaly in part B showed the presence of graphitic coal in the country rocks which is the causative source of anomaly. Based on geology, mineralization and fluid inclusion characteristics, the type of mineralization in the Freezi area is orogenic. Possibly metallic elements originated from the graphitic layers  and during the Middle Jurassic orogenic phase, middle Cemmerian, transported by metamorphic water and  deposited in places of suitable structure.

کلیدواژه‌ها [English]

  • Mineralization
  • geochemical
  • fluid Inclusion
  • IP/RS
  • Orogenic

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  • تاریخ دریافت: 15 فروردین 1397
  • تاریخ بازنگری: 07 تیر 1397
  • تاریخ پذیرش: 31 مرداد 1397

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