نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

پتروگرافی، ژئوشیمی، تحولات ماگمایی و موقعیت تکتونوماگمایی سنگ های آذرین همراه با کانی سازی اپی ترمال نیکوییه (غرب قزوین)

نویسندگان
سهیلا آقاجانی 1
مجید قاسمی سیانی 2
محمد هاشم امامی 1
محمد لطفی 1
کاظم قلی زاده 3
1 سازمان زمین‌شناسی و اکتشافات معدنی کشور، پژوهشکده علوم زمین
2 دانشگاه خوارزمی، دانشکدۀ علوم زمین
3 دانشگاه شهید بهشتی تهران، دانشکدۀ علوم زمین، گروه زمین‌شناسی
10.52547/gnf.6.1.1
چکیده
منطقۀ نیکوییه در جنوب پهنه فلززایی طارم- هشتجین، در پهنه البرز باختری واقع شده است. توده­های نیمه­عمیق الیگومیوسن و سنگ­های آتشفشانی ائوسن میانی با ترکیب داسیت (داسیت هیبریدی) تا آندزیت مهم­ترین واحدهای آذرین همراه با کانی­سازی پلی­متال اپی­ترمال نیکوییه هستند. فازهای آذرین نیمه­عمیق متشکل از سنگ­های مونزودیوریت تا کوارتزمونزونیت و سی­نیت پورفیری (کوارتز سی­نیت) نوع I است و دارای مقدار Na2O+K2O برابر 62/4 تا 9/9 درصد وزنی و مقدار K2O/Na2O برابر 45/0 تا 66/1 هستند. ترکیب شیمیایی سنگ­های آذرین منطقه نیکوییه در رده سنگ‌های متاآلومین، کالک­آلکالن پتاسیم بالا تا شوشونیتی قرار می­گیرد. بافت غربالی و منطقه­بندی نوسانی در پلاژیوکلاز، خوردگی و گردشدگی فنوکریست­ها، وجود گزنومورف‌های کوارتز، منطقه­بندی و ترکیب بایمدال فنوکریست­های کلینوپیروکسن و وجود داسیت هیبریدی و سه ترکیب شیشه متفاوت در آن نشان­دهندۀ عدم تعادل فیزیکوشیمیایی و احتمالاً نتیجه اختلاط ماگمایی است. نمودارهای عنکبوتی نشان می­دهد که سنگ­های آذرین دارای غنی­شدگی LILE و تهی­شدگی در Nb ,Ta و Ti هستند، که این ویژگی­ها از خصوصیات ماگماهای وابسته به پهنه فرورانش است. هم‌چنین بالابودن نسبت­های LILE/HFSE و LREE/HREE، میزان TiO2 کم‌تر از یک درصد و نسبت زیاد Ba/Ta از مشخصات مناطق فرورانش محسوب می­شوند. در نمودارهای محیط تکتونیکی، سنگ­های آتشفشانی منطقه، خصوصیات کالک­آلکالن پتاسیم بالا و سنگ­های نیمه­نفوذی در محدودۀ گرانیتوئیدهای کمان ماگمایی ((VAG واقع می­شوند.
کلیدواژه‌ها
 غنی­ شدگی LILE
فرورانش
گرانیتوئیدهای کمان ماگمایی
تحولات ماگمایی
اختلاط ماگمایی
نیکوییه

عنوان مقاله English

Petrography, Geochemistry, Magmatic Evolution and Tectenomagmatic setting of Igneous Rocks Associated with Nikuyeh Epithermal Mineralization (west of Qazvin)

نویسندگان English

Soheila Aghajani 1
Majid Ghasemi Siani 2
Mohammad Hashem Emami 1
Mohammad Lotfi 1
Kazem Gholizadeh 3
1 Geological Survey of Iran, Research Institute of Erath Science, Tehran, Iran
2 Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University, Iran
3 Department of Geology, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran
چکیده English

The Nikuyeh district is located south of the Tarom-Hashtjin metallogenic province in Western Alborz. Oligo-Miocene subvolcanic intrusion and Mid-Eocene volcanic rocks with composition of dacite (hybrid dacite) to andesite are main igneous units associated with Nikuyeh polymetallic epithermal ore mineralization. Subvolcanic igneous phase consists of I type porphyritic monzodiorite to quartz monzonite and quartz syenite (quartz syenite), and have an average alkali (Na2O+K2O) content of 4.62- 9.9 wt%, and K2O/Na2O content of 0.45- 1.66. The chemical compositions of igneous rocks show that belong to meta- alumina series, high–K calc-alkaline to shoshonitic rocks. Sieve-textured and zoning in plagioclase, corrosion and rounded of phenocrysts, presence of quartz xenocrysts, zoning and bimodal composition of clinopyroxene phenocrysts and presence of hybrid dacite and its three different glass compositions show physicochemical disequilibrium and probably magmatic mixing. Spider diagrams show that igneous rocks are enriched in in large ion lithophile elements (LILE) and depleted in Ta, Nb and Ti which these features are typical of the subduction-related magmas. On the other hand, highly LILE/HFSE and LREE/HREE ratios, low content of TiO2 (<1 percent), and high Ba/Ta ratio are subduction magma features. Tectonic setting diagrams show that district volcanic rocks have high–K calc-alkaline, and subvolcanic rocks located in volcanic arc granitoid (VAG).

کلیدواژه‌ها English

LILE enrichment
Subduction
Volcanic arc granitoid
Magmatic evolution
Magmatic mixing
Nikuyeh
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