کانی‌شناسی، زمین‌شیمی و سنگ‌زایی آمفیبولیت‌های شمال‌شرق یان‌چشمه، جنوب‌شرق دریاچه زاینده‌رود

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه شهرکرد

2 دانشگاه کردستان

چکیده

در شمال­شرق روستای یان­چشمه (جنوب­شرق دریاچه زاینده­رود) رخنمون­هایی از سنگ­های آمفیبولیتی با بافت میلونیتی دیده می­شوند. کانی­شناسی این سنگ­ها شامل آمفیبول، پلاژیوکلاز، کوارتز، کلینوزوئیزیت، روتیل، کلریت، تیتانیت، بیوتیت و کانی کدر است. آمفیبول­ها به صورت ماهی دیده می­شوند. این آمفیبولیت­ها دارای یک سنگ مادر آذرین بازالتی با ماهیت نیمه قلیایی هستند و براساس مقدار نیکل (370- 299 قسمت در میلیون) و کروم (1900 -1169 قسمت در میلیون) و سیلیس (20/49- 91/44 درصد وزنی) شباهت زیادی به ماگمای جدایش نیافته دارند. الگوی عناصر خاکی نادر بهنجار شده به کندریت، غنی­شدگی عناصر خاکی نادر سبک (LREE) نسبت به عناصر خکی نادر سنگین (HREE) بدون ناهنجاری مشخصی از Eu را نشان­می­د­هد. مقادیر پایین TiO2، Zr، P < sub>2O5 و Nb/Y به همراه غنی­شدگی از LREE همراه با ناهنجاری منفی Nb از مشخصه­های بارز بازالت­های تولئیتی سیلابی قاره­ای و فعالیت ماگمایی درون صفحه­ای است. مقادیر پایین Rb وNb نشان­دهنده آلودگی کم پوسته­ای است. تمایلات تولئیتی، درصد عناصر قلیایی پایین به همراه بالا بودن مقدار MgO،FeO ، Cr و Ni بیانگر ذوب بخشی بالا در یک محیط کششی درون قاره­ای همراه با کاهش سریع فشار بوده که منجر به  بالا آمدگی سریع ماگما و عدم آلودگی پوسته­ای شده است که به عنوان عوامل موثر بر تشکیل سنگ مادر بازالتی این آمفیبولیت­ها­ معرفی شده­اند

کلیدواژه‌ها


عنوان مقاله [English]

Mineralogy, geochemistry and petrogenesis of protolith of amphibolites from the North east of Yan-Cheshmeh, South east of Zayandeh-rud lake

نویسندگان [English]

  • Seyed Mohammad Hosseini 1
  • Alireza Davoudian Dehkordi 1
  • Nahid Shabanian Borojeni 1
  • Hosain Azizi 2
1
2
چکیده [English]

Amphibolite rocks with mylonitic texture exposed in the NE of Yan- Cheshmeh village (SE of Zayandeh-Rud Lake). Mineralogy of rocks include amphibole, plagioclase, quartz, rutile, clinozoesite, chlorite, titanite, biotite and opaque. Amphiboles are seen as fish. Basic igneous rocks are protolith of the amphibolites that have subalkaline nature. Ni (299-370 ppm), Cr (1169-1900 ppm) and SiO2 (44.91-49.20 %Wt) contents highly resemble to unfractionation magmas. Chondrite normalized REE patterns exhibit pronounced LREE enrichment relative to HREE without Eu anomaly. Low TiO2, Zr, P < sub>2O5 and Nb/Y contents with enrichment of LREE and negative Nb anomaly are pronounced characters of continental flood tholeiitic basalt within plate magmatism. Tholeiitic affinities, low values of alkali elements, high MgO, FeO, Cr and Ni contents suggest high partial melting in an extensional setting of continental within-plate with rapid decrease in pressure, resulting in high rate of partial melting and quick uplift which are effective factors for the formation of basaltic protolith of the amphibolites.   

کلیدواژه‌ها [English]

  • Geochemistry
  • within-plate basalts
  • amphibolite
  • Yan Cheshmeh
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