نرخ هسته‌بندی و رشد بلورهای پلاژیوکلاز و پیروکسن در سنگ‌های آندزیتی و بازالتی منطقه عباس آباد، شرق شاهرود

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی شاهرود

چکیده

نوار ماگمایی ائوسن کاهک- عباس­آباد، در کرانه شمال شرقی پهنه ساختاری ایران مرکزی، از داورزن در غرب سبزوار تا میامی در شرق شاهرود امتداد دارد. واحدهای سنگی این نوار شامل تناوبی از سنگ­های آتشفشانی بازی - حدواسط (الیوین بازالت، بازالت، تراکی­بازالت، تراکی­آندزی بازالت، تراکی­آندزیت و آندزیت) و سنگ­های آذرآواری –رسوبی (انواع توف، بِرِش، آگلومرا، ماسه­سنگ، ­شیل، کنگلومرا، سنگ آهک نومولیتی و سنگ آهک توفی) به سن ائوسن میانی – پسین و سنگ­های رسوبی الگیوسن و کواترنری هستند. سنگ­های آتشفشانی این نوار، یک سری تفریقی پیوسته با خاستگاه مشترک از یک ماگمای والد بازالتی هستند. گدازه­های بازالتی– آندزیتی منطقه از آنجا که از نوع پیروکسن پورفیری، پلاژیوکلاز پورفیری و پیروکسن- پلاژیوکلاز پورفیری هستند، نمونه­های مناسبی برای بررسی­های توزیع اندازه بلور (CSD) به­شمار می­روند. براساس نتایج این پژوهش، درشت بلور­های پلاژیوکلاز و پیروکسن موجود در سنگ­های آتشفشانی منطقه، به ترتیب در گستره زمانی86 تا 118 سال و با نرخ هسته­بندی از 10-10× 48/1- تا 10-10× 56/1 میلی­متر بر ثانیه و در گستره­ زمانی 104×21/3 تا 104 × 3/6 ثانیه و با نرخ هسته­بندی از  5-10× 55/0 تا  5-10× 2 میلی متر بر ثانیه در آشیانه ماگمایی رشد کرده­اند.     

کلیدواژه‌ها

عنوان مقاله [English]

Crystal size distribution analysis of plagioclase and pyroxene in basaltic and andesitic rocks of Abbasabad Area, east of Shahrood

نویسندگان [English]

  • Barzgari
  • Ghasemi
  • Rezaei-Kahkhaei
چکیده [English]

The Kahak- Abbasabad Eocene magmatic belt is situated in the northeast edge of Central Iran Zone and extended from Davarzan in the west of Sabzevar to Mayamey in the east of Shahrood. Rock units of the study area include an alternation of basic- intermediate volcanic rocks (olivine basalt, basalt, Trachybasalt, trachyandesitic basalt, trchyandesite and andesite) and pyroclastic–sedimentary rocks (varieties of tuffs, breccia, agglomerate, sandstone, shale, conglomerate, nummolitic limestone and tuffuceous limestone), which belong to Upper-Middle Eocene, and sedimentary rocks of Oligocene and Quaternary. The volcanic rocks of this belt form a continuous fractional series, originated from a same parental basaltic magma. Hence, the basaltic-andesitic lava flows are pyroxene porphyry, plagioclase porphyry and pyroxene-plagioclase porphyry; they are favorable for Crystal Size Distribution (CSD) studies. According to calculations of this research, plagioclase and pyroxene phenocrysts of the volcanic rocks have been grown in magmatic chamber in time range of 86.20 to 118.01 years with nucleation rates from 1.48×10-10 to 1.56×10-10 mms-1and in time range of 3.21 ×104 to 6.34×104 years with nucleation rates from 0.55×10-3 to 2×10-5mms-1, respectively.

کلیدواژه‌ها [English]

  • Crystal size distribution (CSD)
  • Basaltic- andesitic rocks
  • Abbasabad
  • Shahrood

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  • تاریخ دریافت: 22 فروردین 1396
  • تاریخ بازنگری: 08 اردیبهشت 1396
  • تاریخ پذیرش: 10 خرداد 1396

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