نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

ژئوشیمی و پترولوژی سنگهای نفوذی علمکوه، غرب کلاردشت، البرزمرکزی

نویسندگان
نعمت الله رشیدنژاد عمران 1
مجید قاسمی سیانی 2
زهرا سعیدی 1
حاج یانگ 3
1 داتشگاه تربیت مدرس
2 دانشگاه خوارزمی
3 دانشگاه ملی چنگ-کونگ
چکیده
توده گرانیتوئیدی علمکوه، در قسمت غربی کلاردشت، در زون ساختاری ماگمایی البرز مرکزی واقع شده و متشکل از واحدهای آلکالی گرانیت، سینیت و -

سینودیوریت تا مونزونیت است. سنگهای نفوذی علمکوه حاوی کانیهای پلاژیوکلاز، کوارتز، آلکالی فلدسپار و بیوتیت هستند. در قسمت شمالی توده نفوذی

علمکوه، آنکلاوهای مافیک حضور دارند که نشاندهنده فرایند اختلاط و آمیختگی ماگمایی است. انواع بافتهای پرتیتی و همرشدی در همراهی با بافتهای

گرانولار، میکروگرانولار و میکروگرانولار پورفیری در این سنگها دیده میشوند. بر اساس مطالعات شیمی کانیها و شیمی سنگکل، تودهها از نوع گرانیت I با

ماهیت آلکالن تا شوشونیتی و متاآلومین هستند. نمونه های توده علم کوه غنی شدگی بیشتری از LREE و عناصر La, Rb, Th, Nb و تهیشدگی نسبی از

عناصر Ba و Zr نشان میدهند. از نظر جایگاه تکتونیکی، در محدوده گرانیت های قوس آتشفشانی (VAG) در محیط کششی کمان ماگمایی البرز تشکیل

شدهاند، و گوشته لیتوسفری متاسوماتیزه و استنوسفری در زایش ماگمای گوشتهای دخالت داشتهاند. اختلاط دو ماگما با خاستگاههای گوشتهای و پوستهای

و تفریق و تبلور، مهمترین فرایندهای موثر در تحولات ماگما و تنوع سنگها در منطقه بودند.
کلیدواژه‌ها
پترولوژی
ژئوشیمی
شیمی کانی
توده گرانیتوئیدی علمکوه
البرز مرکزی

عنوان مقاله English

Geochemistry and Petrology of Alam -Kuh Intrusive Rocks, West of Kelardasht, Central Alborz

نویسندگان English

Nematolah Rashid Nejad Omran 1
Majid Ghasemi Siani 2
ZAHRA SAEIDI 1
Huai-jen yang 3
1 TARBIAT MIDARES UNI
2 kharazmi University
3 3national cheng-kung University
چکیده English

Alam- kuh granitoid intrusion is located in the western part of kelardasht, Central magmatic Alborz structural zone. Alam- kuh granitoid intrusion consist of alkaligranite, syenite, and syenodiorite to monzonite rocks. In the northern part of Alam -kuh intrusion, there are mafic enclaves that represent the magma mixing and mingling process. it consists of plagioclase, quartz, alkali feldspar and biotite minerals. Types of pertite and myrmekite textures associated with granular, microgranular and microgranular porphyry textures observed in these rocks. According to mineral chemistry and whole rock chemistry studies, intrusion rocks are I-type which are typically of shoshonites and are aluminous, metaluminous. Alam- kuh samples are shown enriched in light rare earth elements (LREEs), and La, Rb, Th, Tb elements and depleted in Ba and Zr elements. Based on the major element oxides, tectonically, located in the volcanic arc granitoids (VAG) .Primary magma of district igneous rocks were produced by the melting of the underlying crustal protolith (amphibolite) and (meta-graywacke ), and the basaltic magma derived from the mantle which replaced in the lower crust could be thermal origin for partial melting of crustal source and mixed with crustal felsic magma. According to studis, In the stretching environment of Alborz Magma Bow, Lithosphere mantle and stenospheric mantle, Both were involved in the birth of a mantle with different stocks. Mixing two magmas with mantle and crustal origins and subtraction and crystallization, The most important processes were the development of magma and the diversity of rocks in the region.

کلیدواژه‌ها English

Petrology
Geochemictary
Mineral chemistry
Alam- kuh granitoid
Central Alborz
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