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Naseri H, Calagari A A, Alavi G, Heidari M. Investigating the mineralogy, alteration and geochemical characteristics of volcanic host rock in Alchehgheshlagh deposit (north Varzeghan), East Azerbaijan. www.ijcm.ir 2024; 32 (4) :739-758
URL: http://ijcm.ir/article-1-1894-fa.html
URL: http://ijcm.ir/article-1-1894-fa.html
ناصری حسین، کلاگری علی اصغر، علوی سید غفور، حیدری سید مهران. بررسی ویژگی های کانه‌زایی، دگرسانی و زمین‌شیمی سنگ میزبان آتشفشانی در کانسار آلچهقشلاق (شمال ورزقان)، آذربایجان شرقی. مجله بلورشناسی و کانی شناسی ایران. 1403; 32 (4) :739-758
حسین ناصری*1 
، علی اصغر کلاگری1 ، سید غفور علوی1 ، سید مهران حیدری2
، علی اصغر کلاگری1 ، سید غفور علوی1 ، سید مهران حیدری2
1- گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران
2- پژوهشکده علوم زمین، سازمان زمین شناسی و معدنی کشور، تهران، ایران
2- پژوهشکده علوم زمین، سازمان زمین شناسی و معدنی کشور، تهران، ایران
چکیده: (488 مشاهده)
منطقه آلچهقشلاق در شمال شهر ورزقان و جنوب معدن سونگون در پهنه فلززایی ارسباران واقع است. سنگهای آتشفشانی مورد بررسی با سن ائوسن شامل آندزیت و تراکیآندزیت، داسیت، داسیتآندزیت و ریوداسیت هستند که با دایکهای ریولیتی و داسیتآندزیتی قطع شدهاند. حضور رگههای سیلیسی و باریتی همراه با دگرسانیهای گسترده فیلیک، آرژیلیک و پروپیلیتی از سیماهای کانیسازی در این منطقه است. کانیهای اسفالریت، کالکوپیریت، گالن و پیریت همراه کانیهای رسی، سریسیت، کربناتی و کلریتی از ویژگیهای کانیزایی هستند. ماگمای سازنده این سنگها دارای سرشت آهکی قلیایی پتاسیم بالا تا شوشونیتی است. نمودار عنکبوتی عناصر کمیاب بهنجار شده به کندریت نشانگر غنیشدگی عناصر سنگ دوست درشت یون (LILE) نسبت به عناصر با شدت میدان بالا (HFSE) و ناهنجاری مثبت عناصر K، Rb و Th و ناهنجاری منفی عناصر Nb و Ti و در نتیجه بیانگر فعالیت ماگمایی کمانهای آتشفشانی کرانه قارهای و فرورانش است. نمودار عناصر خاکی نادر (REE) نیز نشان دهنده غنیشدگی عناصر خاکی نادر سبک (LREE) نسبت به عناصر خاکی نادر سنگین (HREE) و میانه (MREE) بوده که از ویژگیهای سنگهای آتشفشانی سری آهکی قلیایی وابسته به کمان ماگمایی است. این نتایج نشانگر غنیشدگی گوشته با فرایند فرورانش هستند. بررسی نمودارهای مختلف سنگشناسی، محیط زمین ساختی پهنههای فرورانش کرانه فعال قارهای را نشان میدهد.
واژه‌های کلیدی: کانیزایی، زمین‌شیمی، فرورانش کرانه قارهای، آلچه قشلاق.
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