نتایج جستجو برای: andesite
تعداد نتایج: 762 فیلتر نتایج به سال:
The study area is located in Central Iranian volcano-plutonic copper belt (Dehaj-Sarduiyeh belt) about 42 Km northeast of Shahrbabak in Kerman Province. Based on petrographic studies, extrusive rocks have the composition from trachyandesite, andesite basaltic and andesite to dacite with Eocene age. Mineralogically, the rocks contain plagioclase, amphibole, biotite and quartz. Chlorite, calcite,...
Halmahera Island retains several gold deposits. One of the deposits is called as low sulphidation epithermal (LSE) quartz veins which currently being mined and situated in Gosowong goldfield. The mostly originated N-S NNE-SSW direction. This study aimed to determine prospect area northern portion goldfield covering West Kao sub district based on surface mapping rock/float- BLEG stream sediment ...
The use of cement materials in construction continues to increase every year, consumes lots raw material and emits CO2 from clinker production. To eliminate this negative effect, alternative are needed. Trass is natural pozzolan which formed silica-alumina rich volcanic rocks. As supplementary cementitious material, trass sufficiently durable reduce proportion mixture, thus more environmentally...
چکیده ندارد.
The Tertiary volcanic rocks in the north and west of Birjand are dacite; andesite, basaltic andesite, trachyandesite and rhyolite.They belong to calc- alkaline from magmatic series. Mineralogcal, petrographcal and geochemical evidence show that they have formed in active continental margins. Most andesites and dacites are appeared as volcanic domes or subvolcanic dykes that injected older units...
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