سنگ‌نگاری، زمین شیمی سنگ‌کل و شیمی کانی کلینوپیروکسن و آمفیبول در سنگ‌های قلیایی بازیک قاعده سازند شمشک، جنوب آزادشهر، البرز شرقی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه پترولوژی و زمین‌شناسی اقتصادی، دانشکده علوم زمین، دانشگاه صنعتی شاهرود

2 مؤسسه زمین شناسی و زمین فیزیک آکادمی علوم چین، پکن، چین

چکیده

در منطقه جنوب آزادشهر، در قاعده توالی­های سازند شمشک، وجود دو رخنمون متفاوت از سنگ­های آذرین بازیک به صورت توده­های الیوین­گابرویی و دایک­های دیوریتی قلیایی پگماتوئیدی نمایان ­است. کانی­های سازنده الیوین­گابروها شامل الیوین، کلینوپیروکسن و پلاژیوکلاز هستند و دیوریت­های قلیایی نیز از آمفیبول­های درشت بلور و پلاژیوکلاز تشکیل شده­اند. زمین شیمی عناصر اصلی، کمیاب و خاکی نادر این نمونه­ها نشان دهنده ماهیت قلیایی ماگمای سازنده و برخاستن این ماگما از یک خاستگاه گوشته­ای مشابه با خاستگاه نوع بازالت جزایر اقیانوسی (OIB) است. ترکیب شیمیایی کانی­های الیوین و پلاژیوکلاز در الیوین­گابروها به ترتیب کریزولیت و لابرادوریت است. کلینوپیروکسن­های الیوین گابروها از نوع دیوپسید-اوژیت با ماهیت قلیایی و غیرکوهزایی هستند و در فشار حدود ۲ تا ۱۱ کیلوبار، دمای ۱۲۰۰ تا ۱۲۵۰ درجه سانتیگراد و گریزندگی اکسیژن بالا تشکیل شده­اند. آمفیبول­های دیوریت­های قلیایی نیز با ترکیب کرسوتیت-مگنزیوهاستینگزیت (کلسیمی) از نوع آذرین مشخص شده­اند و دارای خاستگاه گوشته­ای هستند. دما و فشار تبلور آمفیبول­ها، ۹۵۰ درجه سانتیگراد و در گستره ۶۰۰ تا ۷۵۰ مگاپاسکال (معادل ۶ تا ۵/ ۷ کیلوبار) تعیین شده­است. پلاژیوکلازهای دیوریت­های قلیایی دارای ترکیب آلبیتی دارند.      

کلیدواژه‌ها

عنوان مقاله [English]

Petrography, whole-rock geochemistry and mineral chemistry of clinopyroxene and amphibole in basic alkaline igneous rocks of Shemshak Formation, S Azadshahr, Eastern Alborz

نویسندگان [English]

  • Shahabi 1
  • Ghasemi 1
  • Rezai Kahkhai 1
  • Minggou 2
1 Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
2 Institute of Geology and Geophysic, Chinese Academy of Science (IGGCAS), Beijing, China
چکیده [English]

At the base of Shemshak Formation in the south Azadshahr area, some igneous mafic rocks are discovered recently  as olivine gabbro bodies and pegmatoid alkali-diorite dikes. Rock-forming minerals of olivine gabbro includes olivine, clinopyroxene and plagioclase, alkali-diorites are composed of large amphiboles and plagioclase. Major and trace elements characteristics of these rocks indicate they have alkaline nature and derived from OIB-like mantle source. Mineral chemistry of olivines and plagioclases in olivine gabbros determined as chrysolite and labradorite, respectively. Clinopyroxenes in olivine gabbros have diopsidic to augitic composition  and alkaline (Non-orogenic) affinity, and they formed in 2-11 Kbar, 1200-1250˚C and high oxygene fugasity conditions. Amphiboles in alkai-diorites are calcic and characterized with kaersutite to magnesiohastingsite in composition, igneous nature and derived from mantle sources. Their crystallization temperature and pressure are 950˚C and 600-750 MPa (equivalent 6-7/5 Kbar). Plagioclases in alkali-diorites are albite.

کلیدواژه‌ها [English]

  • Alkaline basic rocks
  • Shemshak Formation
  • mineral chemistry of clinopyroxene and amphibole
  • Azadshahr
  • Eastern Alborz

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مجله بلورشناسی و کانی شناسی ایران
دوره 29، شماره 1 - شماره پیاپی 81
فروردین 1400
صفحه 111-128

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  • تاریخ دریافت: 14 اردیبهشت 1398
  • تاریخ بازنگری: 02 خرداد 1399
  • تاریخ پذیرش: 07 تیر 1399

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