جداسازی آنومالی‌های زمین‌شیمیایی فلزات سرب و روی با استفاده از روش‌ آماری کلاسیک (Mean+nSTEV)، شاخص سینگولاریتی، سنجش از دور و عوامل ساختاری در ورقه 1:100000 خُنداب؛ بخش شمالی زون ملایر-الیگودرز-اصفهان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجو کارشناسی ارشد، دانشکده زمین‌شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران

2 گروه زمین شناسی، دانشکده علوم، دانشگاه تهران، تهران، ایران

3 دانشگاه آزاد اسلامی اهواز- گروه زمین شناسی

چکیده

در این مطالعه از روش آمار کلاسیک، شاخص سینگولاریتی، سنجش از دور، نمودار شواهد وزنی (WofE) و تجزیه و تحلیل ساختاری برای جداسازی آنومالی-های ژئوشیمیایی از زمینه برای فلزات سرب و روی در منطقه مورد مطالعه بکار گرفته شد. روش آمار کلاسیک (Mean+nSTEV) نشان داد که مقدار آستانه برای فلزات سرب و روی به ترتیب 75/30 ppm و 18/153 ppm است. در نقشه‌های بدست آمده از روش شاخص سینگولاریتی آنومالی‌های ضعیف و پنهان بهتر نمایش داده شده و همپوشانی بهتری با سنگ آهک که به عنوان سنگ میزبان در ذخایر سرب و روی (نوع MVT)، تراکم گسل‌ها و دگرسانی‌های موجود در منطقه مورد مطالعه، نشان می‌دهد. علاوه بر این، آنومالی‌های بدست آمده از این روش همپوشانی بالایی با معادن سرب و روی موجود در منطقه نشان می-دهند. بطور کلی در این مطالعه مشخص گردید که عیار فلز سرب در جنوب و شمال‌شرق و عیار فلز روی در شمال‌شرق و مرکز محدوده بیشترین میزان آنومالی را از خود نشان می‌دهند که در این مناطق احتمال وجود مناطق کانساری از نوع MVT بسیار بالا است. از طرفی آنومالی‌های بدست آمده با واحدهای آهک کرتاسه و گسلش منطقه که در کانه‌زایی سرب و روی ارتباط مستقیمی دارد، انطباق بالایی را نشان می‌دهند.

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