مقایسه تراکم عناصر گروه پلاتین در کرومیتیت‌های افیولیت خوی: نشانه‌ای از حضور دو نوع کرومیتیت با دو خاستگاه متفاوت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تهران

2 دانشگاه ارومیه

چکیده

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.    

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of PGE concentration in the chromitites of Khoy Ophiolite: Its implication for the presence of two types of chromitites with two different origins

چکیده [English]

Khoy ophiolitic complex in northwest of Iran have several chromitite bodies with various textures, different geochemical features and associated minerals. Based on Cr#, Khoy chromitites are divided into two groups: high-Cr (Cr# > 0.6) and high-Al (Cr# < 0.6) chromitites. The high-Cr contain some amount of PGEs with tiny grains of platinum-group minerals (PGM), whereas, high-Al chromitites are poor in PGE with no PGM inclusions. Geochemical analysis and Raman spectroscopy data on PGM inclusions in the high-Cr chromian spinels shows that they are laurite and rarely irarsite in composition. The PGE concentration in high-Cr- and high-Al chromitite reveals that the high-Cr chromitites probably were formed in a magmatic arc tectonic setting and those of high-Al were occurred in a back arc basin environment.

کلیدواژه‌ها [English]

  • Platinum group-elements
  • chromitites
  • Raman Spectroscopy
  • khoy ophiolite
  • Iran

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  • تاریخ دریافت: 24 فروردین 1396
  • تاریخ بازنگری: 08 مرداد 1396
  • تاریخ پذیرش: 04 شهریور 1396

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