دوره 26، شماره 2 - ( 4-1397 )                   جلد 26 شماره 2 صفحات 273-286 | برگشت به فهرست نسخه ها


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مجموعه افیولیتی خوی در شمال غرب ایران دارای کانسارهای متعدد کرومیتی است که از نظر بافتی، زمین­شیمیایی و کانی‌های همراه متفاوت هستند. کرومیتیت‌های خوی بر اساس Cr# به دو گروه کلی کرومیتیت‌های غنی از Cr (Cr#>6/0) و غنی از Al (Cr# < 6/0) تقسیم می‌شوند. از نظر تراکم عناصر گروه پلاتین، کرومیتیت‌های غنی از Cr دارای مقادیر بیشتری از عناصر گروه پلاتین (PGE) و میانبار‌های بسیار کوچکی از کانی‌های گروه پلاتین (PGM) هستند. درحالیکه، کرومیتیت‌های غنی از Al تهی شده‌تر از PGE و فاقد PGM به صورت میانبار هستند. بررسی­های زمین­شیمیایی و طیف­­سنجی رامان بر میانبار‌های کانی‌های گروه پلاتین مشخص کرد که در کرومیتیت‌های غنی از Cr خوی لاوریت‌ و به مقدار کمتر ایرارسیت وجود دارد. تراکم PGE در کرومیتیت‌های غنی از Cr و غنی از Al نشان می‌دهد که گروه نخست به احتمال زیاد در محیط قوس و گروه دوم در حوضه‌های پشت قوس تشکیل شده­اند.    
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نوع مطالعه: پژوهشي | موضوع مقاله: تخصصي
دریافت: ۱۳۹۷/۴/۱۶ | پذیرش: ۱۳۹۷/۴/۱۶ | انتشار: ۱۳۹۷/۴/۱۶

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