بررسی سنگ های ماگمایی و اثرات زیست محیطی زون های دگرسانی منطقه یوزباشی چای (غرب قزوین)

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه لرستان، خرم آباد

چکیده

منطقه مورد بررسی یوزباشی چای در شمال­غرب قزوین به لحاظ واحدهای چینه­شناسی اساساً متعلق به سنوزوئیک است. شواهد صحرایی، بررسی­های پترولوژیکی و داده­های ژئوشیمیایی سنگ­های ماگمایی و زون­های دگرسانی منطقه یوزباشی چای حاکی از آنند که سنگ­های منطقه متشکل از بازالت، آندزیت بازالتی، آندزیت، تراکی آندزیت، تراکیت، ریوداسیت، داسیت، توف و دایک می­باشند. پلات نتایج آنالیز عناصر اصلی و کمیاب در دیاگرام­های متمایز کننده مختلف حاکی از آن است که این سنگ­ها در اثر ماگماتیسم مرتبط با فرورانش و در حاشیه قاره تشکیل گردیده­اند. طبق رده­بندی واحدهای مختلف دگرسانی، محدوده وسیعی از منطقه متحمل دگرسانی از نوع آرژیلیک حدواسط تا پیشرفته گردیده است. در آب منطقه به دلیل اثرات زون­های دگرسانی، کلسیم و سولفات دارای نابهنجاری بسیار بالایی است. هم­چنین نتایج آنالیز نمونه­های آب منطقه دال بر سختی، بیش­تر از حد مجاز می­باشند. حضور کانی سولفات پتاسیم آلومینیم آبدار (آلونیت یا زاج) به عنوان منبع بالقوه­ای برای تولید آب­های اسیدی می­باشد. براساس استاندارد آب آشامیدنی ایران در مناطق دگرسانی خصوصاً در محدوده معادن قازان داغی آب از نظر مقدار کل مواد جامد محلول (TDS) بالاتر از حد مجاز می­باشد و حتی آب آقچه کند که جزء مناطق دگرسان شده می­باشد در زمره آب­های مسمومیت­زا قرار می­گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Study of magmatic rocks and environmental impact of alteration zones in Youzbashi-Chai region (West of Qazvin)

نویسندگان [English]

  • R. Sarikhani
  • A. Ghassemi Dehnavi
  • R. Zarei Sahamieh
  • A. Moradpour
چکیده [English]

The studied area of Yuzbashi-Chay located in the North West of Qazvin and stratigraphically includes Cenozoic units. Field evidence, petrological studies and geochemical data of magmatic rocks and alteration zone suggest that, this area consist of basalt, basaltic andesite, andesite, trachyandesite, trachyte, rhyodacite, dacite, tuff and dike. Plot of the major and trace elements analysis results in different discrimination diagrams indicate that these rocks formed by subduction-related magmatism in continental margins environment. Based on classification of different alteration unites; the vast parts of studied area affected by intermediate to advanced argillic-type alteration. Besides; due to the effects of alteration zones, the amount of calcium and sulfate have very high anomaly in water. Furthermore; results of water samples analysis indicate that the water hardness is greater than standard limit.The presence of hydrated aluminum potassium sulfate minerals (alunite or alum) is main potential source to produce of acidic waters. Based on drink water standard of Iran, total dissolved solids (TDS) value in alteration areas, especially in Ghazan Daghi mines, is greater than standard limit and waters of Aghche Kand alteration area are classified in toxicant water type.

کلیدواژه‌ها [English]

  • Yuzbashi-Chay
  • Subduction
  • Continental margin
  • alteration
  • Total dissolved solids (TDS)

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