کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4728227 1640188 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantitative textural investigation of trachyandesites of Damavand volcano (N Iran): Insights into the magmatic processes
ترجمه فارسی عنوان
تحقیقات کمی بافتی تراچیانستیزی آتشفشان دماوند (ایران): بینش در فرآیند های ماگمایی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


• A plagioclase crystal size distribution (CSD) study on three trachyandesitic units of the Damavand volcano conducted.
• Each segment of the CSD curves is consistent with a particular crystal texture.
• Three different volcanic units show similar concave-up CSD curves indicative of similar crystallization condition.
• Plagioclase CSDs and textures show a non-constant physico-chemical conditions in the magma chamber during the crystallization.
• The occurrence of magma mixing is suggested to be responsible these observation.

Damavand volcano is a dormant stratovolcano in northern Iran in the middle of the Alborz Mountains. Investigation of the magmatic processes responsible for the eruption of the volcano and the conditions of the magma chamber is important in order to understand the volcanism of this system. Owing to their higher abundance and younger age, trachyandesitic rocks are the main components of this volcano. To get insights into the crystallization of these rocks, we carried out a quantitative and qualitative petrographic study of three main volcanic units erupted between 63 and 66.5 years ago. Crystal Size Distribution (CSD) studies can reveal details about magmatic processes. Measuring 4732 individual plagioclase crystals and conducting a CSD study, revealed a non-straight and concave-up CSD curve for nearly all of the studied volcanic units which suggests the occurrence of similar physico-chemical processes responsible for their magmatism. Plagioclase crystals occur as microlites and phenocrysts; the phenocrysts show either oscillatory zoning or sieve textures. Each segment of the CSD curves are consistent with a particular plagioclase texture in all the studied volcanic units. The presence of different plagioclase textures and the concave-up shape of the CSD curves suggests the variation of the physico-chemical conditions of the magma chamber during the magmatism of the Damavand in this time period. Mixing of magmas with different crystal populations can be an alternative for this phenomena.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of African Earth Sciences - Volume 120, August 2016, Pages 238–247
نویسندگان
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