کاربرد شیمی کانی پلاژیوکلاز در بررسی روند تبلور ماگمای توده‎های نفوذی راونج (شمال‎شرق دلیجان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه پیام نور

2 دانشگاه شهید بهشتی

چکیده

توده‎های نفوذی راونج با ترکیب تونالیت، کوارتزدیوریت و میکروکوارتزدیوریت در غرب روستای راونج، شمال‎شرق دلیجان و در پهنه اورمیه- دختر برونزد دارند. پلاژیوکلازها در سه اندازه متفاوت درشت، متوسط و ریزبلور در ترکیب‎های مختلف توده نفوذی راونج دیده می‎شوند. بیشتر بلورهای درشت دارای منطقه­بندی هستند و ماکل‎های چندریخت و پیراشیب در بلورهای متوسط بلور و ریزبلور دیده می‎شوند. نبود میانبارها در مرکز پلاژیوکلازها و تغییرات آنورتیت (An) با روند خطی نسبت به K2O نشان‎دهنده‎ی این است که پلاژیوکلازها فاز اصلی ماگمایی هستند. شیمی پلاژیوکلازها با ماکل چندریخت در گستره‎ی 96/30 An تا 75/58 Anاست و روند تغییرات آهن کل با An در این پلاژیوکلازها یکسان هستند که حالت تبلور عادی همراه با تعادل دمایی را مشخص می‎کنند. شیمی پلایوکلازهای زونه با منطقه‎بندی نوسانی از لبه تا لبه بلور بررسی شده که به ترتیب کمترین و بیشترین مقدار An در توده‎های میکروکوارتزدیوریتی 58/36An - 94/60 Anو تونالیتی 92/41An - 12/54 Anاست. روند تغییرات An و عناصر Fe, Mg و Ti در بلورهای دارای منطقه­بندی پلاژیوکلازها از لبه به لبه بلور روند نوسانی نشان‎ می‎دهند که وجود این تغییرات در پلاژیوکلازهای توده‎های راونج یک روند تبلور جدایش ماگمایی همراه با بارگزاری متوالی ماگمای مافیک‎تر در حالت تعادل دمایی را مشخص می‎کند. تغییرات برآمده از بارگزاری ماگمای مافیک‎تر در مرکز توده‎های نفوذی راونج نسبت به لبه آن بیشتر است.

کلیدواژه‌ها

عنوان مقاله [English]

Using minerals chemistry of plagioclase for the study of magma crystallization process in Ravanj intrusive (NE Delijan)

نویسندگان [English]

  • mahboobeh Jamshidibadr 1
  • mahnaz Khademiparsa 2
  • Fariborz Masoudi 2
1
2
چکیده [English]

The Ravanj intrusive, with tonalite, quartz-diorite, and microquartz-diorite composition, is exposed in the West of Ravang Village, NE Delijan, in Urmia-Dokhtar zone. Plagioclase is observed in three different sizes (coarse, intermediate, and microcrystalline) in the composition of in Ravanj intrusive. Most of the coarse crystals are zoned while intermediate and microcrystalline show polysynthetic and pericline twins. The lack of inclusions in the center of plagioclase and An versus K2O with a linear trend indicate that plagioclase is the main magma phase. The chemistry of polysynthetic crystals is in the range of An30.96 to An58.75, and the variation of Fetotal is the same as An, which determine normal crystallization state with temperature equilibrium. The chemistry of zoned plagioclase with oscillating zoning are analyzed from rim to rim, which is the minimum and maximum of An in microquartz-diorite is An36.58 to An60.94 and in tonalite is An41.92 to An54.12 respectively. The rim-to-rim trend of An and Fe, Mg, and Ti elements in the zoned plagioclase shown oscillatory zoning which indicate that crystallization process of fractional crystallization accompanied by the recharges of mafic magma in the state temperature equilibrium. The recharges of mafic magma in the center of intrusive are higher than the margin.
 

کلیدواژه‌ها [English]

  • minerals chemistry of plagioclase
  • recharges of magma
  • Ravanj intrusive
  • Urmia-Dokhtar zone

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  • تاریخ دریافت: 20 فروردین 1397
  • تاریخ بازنگری: 07 شهریور 1397
  • تاریخ پذیرش: 02 مهر 1397

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