سنگ‌شناسی و جایگاه زمین‌ساختی بازالت‌های دیزباد نیشابور

شنبه 5 خرداد‌ماه سال 1397 ساعت 08:37 ق.ظ

«دیزباد وطن ماست»- یکی از رسالت های سایت دیزباد وطن ماست، جمع آوری کلیه مقالات در حوزه های مختلف که در باب دیزباد نوشته شده اند می باشد. بدین منظور مقاله ای با عنوان سنگ شناسی و جایگاه زمین ساختی بالزات های دیزباد نیشابور را به حضورتان تقدیم می کنم.

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مقاله 14، دوره 21، شماره 84، پاییز 1391، صفحه 113-118  (XML اصل مقاله (3178 K

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22071/GSJ.2012.53965

نویسندگان

امین اله کمالی  1؛ هادی پیروج1؛ فرنود نعمتی2؛ علی عامری1؛ محمد فدائیان3

1گروه زمین شناسی، دانشکده علوم طبیعی، دانشگاه تبریز، تبریز، ایران

2گروه مهندسی آب، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران

3گروه زمین شناسی، دانشگاه پیام نور، اردبیل، ایران

چکیده

محدوده مورد مطالعه در بخش جنوبی نقشه چارگوش طرقبه، در فاصله 90 کیلومتری جنوب باختری مشهد قرار گرفته است. سنگ‌های منطقه مورد مطالعه بازالت قلیایی و تراکی‌آندزیت هستند. کانی‌های اصلی شامل پلاژیوکلاز، پیروکسن و به مقدار کم الیوین وکانی‌های فرعی روتیل، اسفن ، آپاتیت و بافت چیره آنها هیالومیکروپورفیری است.نمودارهای مختلف، سرشت ماگمای مولد را قلیایی (آلکالن) نشان می‌دهند. روند خطی بین Rb/Nb و K/Nb در سنگ‌های منطقه، می‌تواند نشان‌دهندة مخلوط شدن دو منبع گوشتة سست‌کره‌ای(استنوسفری) و سنگ‌کره‌ای(لیتوسفری) باشد.  همچنین بی‌هنجاری مثبتPb  وغنی‌شدگی LREE در نمونه‌های مورد مطالعه نشانة آلایش پوسته‌ای است، پایین بودن  SiO2و منیزیم بالا، به‌ویژه  بی‌هنجاری منفیNb  ،  نقش بسیار مهمی در سنگ‌زایی(پتروژنز) آلودگی پوسته‌ای دارند. محیط زمین‌ساختی این سنگ‌ها نشانگر بازالت‌های درون صفحه‌ای بوده و با توجه به وجود فسیل مرجان در رخساره‌های کربناتی- ماسه‌سنگی منطقه که متعلق به سن دونین است، می‌توان چنین استنباط کرد که سنگ‌های آتشفشانی منطقه در محیط کم‌ژرفا طی فاز کالدونین فوران کرده‌اند.

کلیدواژه‌ها


بازالت قلیایی؛ هیالومیکروپورفیری؛ بازالت‌های درون صفحه‌ای؛ کالدونین



عنوان مقاله [English]

Petrology and Tectonic Setting of Dizbad Basalts, Neyshabour, NE Iran

نویسندگان [English]

A. Kamali1؛ H. Pirooj1؛ F. Nemati2؛ A. Ameri1؛ M. Fadaeyan3

1Department of Geology, Faculty of Natural Science, Tabriz University, Tabriz, Iran

2Department of Irrigation and Drainage, Faculty of Soil and Water, University of Zabol, Zabol, Iran

3Department of Geology, Payam-e- Noor University, Ardabil, Iran


چکیده [English]

The studied area is located in southern part of the Torghabeh quadrangle, 90 km SE of Mashad city. The rocks of the investigated area are alkaline basalt and trachy andesite. The major minerals are plagioclase and pyroxene, minor amounts of olivine. The accessory minerals are rutile, titanite and apatite. The major texture is hiyalomicroporphyry. The nature of magma by various diagrams show that the generated magms are alkaline.The linear trends between Rb/Sr, K/Nb, in the rocks of the study area can show mixing of two sources from mantle astenosphere and lithosphere. Also positive anomaly of Pb and enrichment in LREE, in the studied samples may indicate crustal contamination. The low SiO2, high Mg and also negative Nb anomaly suggest strong role of crustal contamination in the petrogenesis of the studied rocks. The tectonic environment studies shows that these rocks are within plate basalts. Regarding the presence of coral fossil in the associated carbonate rocks and sand stone facies which belong to Devonian age it can be concluded that volcanic rocks of the study area are produed as a Caledonian eruption and shallow depth environment.

کلیدواژه‌ها [English]

Alkaline basalt, Hiyalomicroporphyry, Within plate basalt, Caledonian

  

مراجع

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درویش زاده، ع.، 1370- زمین‌شناسی ایران، نشر دانش امروز (وابسته به موسسه انتشارات امیرکبیر).


نبوی، م.، 1355 - دیباچه‌ای بر زمین شناسی ایران. انتشارات سازمان زمین شناسی کشور.


نعمتی، ف.، 1388- مطالعه سنگهای آتشفشانی شمال غرب روستای دیزباد – نیشابور، شمال شرق ایران، پایان‌نامه کارشناسی ارشد، دانشگاه تبریز


نعیمی قصابیان، ن.، نقشه زمین‌شناسی 1:25000 گرینه در حال چاپ، سازمان زمین شناسی کشور.


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