یافته‌های نوین زمین‌شناسی کاربردی

یافته‌های نوین زمین‌شناسی کاربردی

­بررسی سنگ‌نگاری و زمین‌شیمی توده ­های گرانیتوئیدی شمال اهر (جنوب کلیبر) با تأکید بر نقش اثر تتراد در الگوی عناصر کمیاب خاکی

نویسندگان
1 دانشجوی دکترا، گروه علوم‌زمین، دانشکده علوم‌طبیعی، دانشگاه تبریز، تبریز، ایران
2 دانشیار گروه علوم‌زمین، دانشکده علوم‌طبیعی، دانشگاه تبریز، تبریز، ایران
3 استاد گروه علوم‌زمین، دانشکده علوم‌طبیعی، دانشگاه تبریز، تبریز، ایران
4 دانشیار گروه زمین‌شناسی، دانشکده علوم‌پایه، دانشگاه بوعلی‌سینا، همدان، ایران
چکیده
تودۀ گرانیتوئیدی شمال اهر در جنوب شهرستان کلیبر و شمال­غربی ایران واقع شده است. این توده با ترکیب گرانیت-کوارتزمونزونیت، میکرودیوریت، مونزونیت، مونزودیوریت و گرانودیوریت پورفیری، دارای بافت­های گرانولار، پگماتیتی، گرافیکی و پرتیتی هستند. از نظر زمین‌شیمیایی، این توده­ها متعلق به گرانیتوئیدهای اکسیدی نوع I با ماهیت متاآلومین بوده که شامل طیفی از سنگ‌های ساب‌آلکالن تا آلکالن هستند. کانی­های اصلی آن­ها اغلب شامل کوارتز، آلکالی فلدسپار، پلاژیوکلاز، مسکوویت و بیوتیت است و از کانی­های فرعی نیز می­توان به تیتانیت و زیرکن (آلانیت، آپاتیت و پیروکلر) اشاره کرد که الگوی اثر تتراد را کنترل می­کنند. الگوی کندریت بهنجار شده REE در گرانیتوئیدهای شمال اهر، یک الگوی اثر تتراد نوع M با بی­هنجاری شدیداً منفی Eu نشان می­دهد. اثر تتراد نوع M به‌عنوان یک ویژگی زمین‌شیمیایی که می­تواند نشان­دهندۀ مراحل پایانی تحول ماگمای گرانیتی همراه با اثر متقابل سیالات هم منشأ باشد، در توده­های گرانیتوئیدی قابل مشاهده است. نسبت­های Y/Ho و Zr/Hf در سنگ­های آذرین بازیک تا حدواسط، نزدیک به نسبت­های کندریتی است که نشان­دهندۀ رفتار CHARAC این عناصر در چنین مذاب­هایی است. نسبت­هایLa/Nb و La/Ta رابطه معکوس با اثر تتراد نشان می­دهند. با افزایش تفریق، نسبت Rb/Sr در سنگ­ها بالا رفته و در نتیجه آن، اثر تتراد نمونه‌های گرانیتوئیدی شمال اهر در محدوده بالاتری از نسبت‌های Rb/Sr رخ داده است. بررسی نسبت­های عناصر کمیاب، به­ویژه دوقلوی زمین‌شیمیایی، نشان­دهنده رفتار non-CHARAC از این عناصر است.
کلیدواژه‌ها

عنوان مقاله English

Petrographic and geochemical investigation of granitoid intrusions in north Ahar (south of Kaleibar) with emphasis on tetrad effect in the rare earth elements pattern

نویسندگان English

Heydar Asgharzadeh Asl 1
Kamal Siahcheshm 2
Mohammadreza Hosseinzadeh 3
Ebrahim Tale Fazel 4
1 Ph.D. Student, Dept. of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
2 Assoc. Prof., Dept. of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
3 Prof., Dept. of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
4 Assoc. Prof., Dept. of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
چکیده English

The granitoid intrusions in northern Ahar is located in the south of Kaleibar city, NW Iran. The granitoids are essentially composed of granite, quartz-monzonite, microdiorite, monzonite, monzodiorite, and porphyry granodiorite with granular, pegmatite, graphitic and perthitic textures. The I-type granitoids are shown by meta-aluminous nature and have a range of sub-alkaline to alkaline rocks. The main minerals of these rocks include quartz, alkali feldspar, plagioclase, muscovite, and biotite, and minor minerals composed of titanite, zircon (allanite, apatite, and pyrochlore). The Ahar granitoids chondrite normalized REE pattern shows an M-type tetrad effect pattern with a strongly negative Eu anomaly. This M-type tetrad effect indicate the final stages of granite magma evolution accompanied by interactions with coexisting fluids. The Y/Ho and Zr/Hf ratios in the basic to intermediate igneous rocks are close to the chondrite ratios, which indicates the CHARAC behavior of these elements in the melts. The La/Nb and La/Ta ratios show an inverse relationship with the tetrad effect. With increasing fractionation, the Rb/Sr ratio in the rocks increased, and as a result, the tetrad effect of the granitoid samples of north Ahar occurred in a higher range of Rb/Sr ratio. The study of the trace element ratios, especially geochemical pairs, indicates the non-CHARAC behavior of these elements.

کلیدواژه‌ها English

Rare Earth Elements
Tetrad Effect
Geochemical Twins
Ahar Granitoids
Qaradagh Zone
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