A 14 x 16 km diameter collapse Pacaya, and other composite cones are part of this caldera has been recognized 10 km south of volcanic front, while Amatitlan and many other Guatemala City, Guatemala. The caldera is north Central American silicic centers are north of the of the presently active volcano Pacaya and west of volcanic front [Rose et al., 1981]. Agua, a large stratovolcano. The caldera...

Interferometric synthetic aperture radar (InSAR) was used to measure ground deformation during explosive eruptions on 27 and 28 May 2010 at Pacaya volcano, Guatemala. Interferograms produced using spaceborne and airborne synthetic aperture radar data reveal ~3 m of along-slope movement of the southwest sector of the edifice during these eruptions. This is the largest measured slope instability ...

introduction the study area is located 12km away from the north east of sarbisheh at the eastern border of the lut block (karimpour et al., 2011; richards et al., 2012). the magmatic activity in the lut blockhas begun in the middle jurassic (165-162 ma) and reached its peak in the tertiary age (jung et al., 1983; karimpour et al., 2011). volcanic and subvolcanic rocks in the tertiary age cover ...

introduction the kahang cu- mo deposit is situated approximately 73 km northeast of isfahan. asadi (2007) identified a geological reserve of 40 mt (proven reserve) grading at 0.53 cu, 0.02 mo and estimated reserve of 120 mt. all the rock types in the region have been subjected to hydrothermal solutions which gave rise to three different alteration facies. the dacite and rhyodacite volcanic rock...

Anhydrite (CaSO4) phenocrysts from Mount Pinatubo pumices show evidence of having responded dynamically to changing conditions prior to the June 15, 1991 climactic eruption. Micrometer-sized and smaller pyramidal surface growth features and lesser numbers of etch pits on anhydrite surfaces are documented by scanning electron microscopy. Chemical analyses indicate that the pyramids are a CaSO4 p...

introduction thermodynamically, the surface waters in mountain environments are unstable and their chemical composition is a reflection of water-rock interactions. few studies have also been undertaken on the geochemistry of the surface waters in mountain environments. hence, this paper deals with the source of elements as well as the chemistry of the stream which drains from the caldera of bid...

Interpretation of gravity and magnetic data for exploration applications may be based on pattern recognition in which geophysical signatures of geologic features associated with localized characteristics are sought within data. A crucial control on what comprises noticeable and comparable characteristics in a data set is how images displaying those data are enhanced. Interpreters are provided w...