نتایج جستجو برای: andesitic composition
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Given the high eruption recurrence in Michoacán-Guanajuato volcanic field (MGVF) central Mexico, birth of a new monogenetic volcano can be expected future. It is important, therefore, to reconstruct past eruptions its many different volcanoes, including estimates lava flow emplacement times and their rheological properties. These studies define range possible future eruptive scenarios are neces...
In order to study the andesitic porphyrite failure rule of open-cut blasting in diversion tunnel reservoir, taking Qianping reservoir project as an example through test and vibration detection, field observation, statistical analysis numerical simulation, technology open cut is studied. Finite element method software ANSYS was used establish finite calculation model reservoir. The process simul...
Ellipsoidal huge granitoidic batholiths of Zahedan, with NW-SE trending, located in south of this city which is intruded in low metamorphosed Eocene flysches (eastern Iran flysch zone). This batholith has two compositional terms: an extensive intermediate-acid term includes diorite - granodiorite with igneous source (I- type origin) and a low extent crustal and hybrid origin acidic term (H-type...
In northwest of Marand northern part of Urumieh Dokhtar Magmatic Arc (UDMA) a set of volcanic rocks crop out with composition of andesite, dacite, and sodic, potassic and ultrapotassic alkaline basalts with Upper Miocene until Plio-Quaternary in age. This paper report the andesitic and dacitic lavas erupted within pyroclastic rocks. These rocks have porphyritic texture and consist of plagioclas...
The Qiyimuchang lead–zinc deposit is an important in the Erguna Massif on west slope of Daxinganling, for which material source and age mineralization remain unclear. has been observed to occur Jurassic volcanic strata as a vein-like orebody, its strike nearly perpendicular that regional structures orogenic belt. ore mainly composed sphalerite, galena, chalcopyrite, pyrite, quartz, hydrothermal...
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