تفاوت ترکیب کلینوپیروکسن در ماگماهای قلیایی و آهکی-قلیایی: بررسی موردی از توده پیرانشهر، شمال غرب ایران

نوع مقاله : مقاله پژوهشی

نویسنده

دانشگاه پیام نور

چکیده

در این پژوهش، ترکیب کلینوپیروکسن در دو نوع گابروی قلیایی و آهکی-قلیایی در توده پیرانشهر مورد بررسی شده است. گستره تغییرات اکسیدهای اصلی در کلینوپیروکسن­های هر دو نوع گابرو مشابه است و همه آنها در رده دیوپسید- اوژیت رده­بندی می­شوند، اما ترکیب عناصر کمیاب در این دو گروه بسیار متفاوت است. کلینوپیروکسن در گابروهای قلیایی غنی از عناصر با شدت میدان یونی بالا (HFSE) و عناصر خاکی نادر (ppm 64- 34 = ΣREE) بوده و نسبت 87Sr/86Sr در آن پایین است. از سوی دیگر، کلینوپیروکسن­های نمونه­های آهکی-قلیایی غنی از Sr، Rb و Ba و فقیر از عناصر HFSE و عناصر خاکی نادر
(ppm 1/26 - 4/9 = ΣREE) با نسبت­های بالاتر 87Sr/86Sr هستند. محاسبه مذاب در حال تعادل با ترکیب عناصر کمیاب کلینوپیروکسن­ها با استفاده از ضرایب جدایش بین کلینوپیروکسن و ماگمای بازالتی نیز بیانگر ماهیت متفاوت منابع تشکیل آنهاست که با داده­های زمین­شیمیایی سنگ­کل گابروها همخوانی دارد.      

کلیدواژه‌ها

عنوان مقاله [English]

The different composition of trace elements in clinopyroxenes of alkaline and calc- alkaline magmas: a case study of Piranshahr pluton, NW of Iran

نویسنده [English]

  • Seyed Ali Mazhari
چکیده [English]

The clinopyroxene composition of two types of alkaline and calc-alkaline gabbros at Piranshahr pluton was investigated in this study. The major oxides variations are similar in all clinopyroxenes of two types of gabbros and are classified as diopside- augite; but trace element compositions are very different in these two groups. The clinopyroxenes of alkaline gabbros are rich in high field strength elements (HFSE) and rare earth elements (ΣREE= 34- 64 ppm) and have high 87Sr/86Sr ratios. In other side, the clinopyroxenes in calc-alkaline samples have high Sr, Rb and Ba and elevated 87Sr/86Sr; but are depleted in HFSE and rare earth elements (ΣREE= 9.4- 21.6 ppm). Calculation of equilibrated melts from trace elements composition of clinopyroxenes using partition coefficients between clinopyroxene and the basaltic melt show that they are formed by different sources which is consistent with whole-rock geochemical data of gabbros.

کلیدواژه‌ها [English]

  • [1] Hou T
  • Zhang Z.C
  • Keiding J.K
  • Veksler I.V
  • Journal of Petrology 5 (2015) 893–9

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مجله بلورشناسی و کانی شناسی ایران
دوره 27، شماره 1 - شماره پیاپی 73
فروردین 1398
صفحه 167-178

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  • تاریخ دریافت: 14 فروردین 1397
  • تاریخ بازنگری: 07 خرداد 1397
  • تاریخ پذیرش: 20 تیر 1397

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