نتایج جستجو برای: dacite
تعداد نتایج: 251 فیلتر نتایج به سال:
Zircon and monazite from three restitic enclaves and one host dacite have been dated by ion microprobe (SHRIMP), with the aim of characterising their Miocene history and defining the timing relationships between crustal melting and eruption in the high-K calc-alkaline volcanics of the Neogene Volcanic Province of SE Spain. The studied samples are from the volcanic edifices of El Joyazo (Cerro d...
The study area is located at 130 km northwest of Nehbandan in South of Khorasan and is a part of the rectangular Chahvak (Dehsalm). Dacite, rhiodacite, andesite, rhyolite, tuff and lithic tuff with Eocene age are recognized in the study area. According to mineralogy, mentioned rocks include plagioclase, quartz, pyroxene, amphibole, biotite and alkaline feldspar. Plagioclase consists of zonal st...
The Lakhshak intrusive assemblage consisting of a granodiorite pluton and monzodiorite and dacite dykes are parts of Zahedan-Saravan granitoid belt which cover about 90.5 km2.. Dykes are parallel with NE-SW trends and comprise about 20-30 percent of the pluton. The granodiorite plutonis granular in texture and comprises mainly consists of plagioclase, K-feldspar, quartz, green hornblende, and...
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