kuh- e -zar gold deposit located 35 km west of torbat-e-heydaryeh, (khorassan e- razavi province), east of iran. this deposit is a specularite-rich iron oxide type (iocg). this mine is situated within khaf-bardascan volcanic plutonic belt. based on recent exploration along this belt, several iocg type system plus kuh-e-zar deposit are discovered. in the study area, several type of tuff and lava...

A volcano-sedimentary succession, including the Guruf volcanic series, is exposed at Gabal Um in north Eastern Desert of Egypt. series intermediate to silicic flows and associated pyroclastic deposits unconformably overlie quartz-diorite granodiorite plutons are intruded by high-level alkali feldspar granites. The metavolcanic xenoliths shown be unrelated volcanics. Two cycles can recognized. l...

The heat capacities of a rhyolite and an andesite glass and liquid have been investigated from relativeenthalpy measurements made between 400 and 1800 K. For the glass phases, the experimental data agree with empirical models of calculation of the heat capacity. For the liquid phases, the agreement is less good owing to strong interactions between alkali metals and aluminum, which are not curre...

■ Abstract The bulk of the ∼50-km-thick Martian crust formed at ∼4.5 Gyr B.P., perhaps from a magma ocean. This crust is probably a basaltic andesite or andesite and is enriched in incompatible and heat-producing elements. Later additions of denser basalt to the crust were volumetrically minor, but resurfaced significant portions of the Northern hemisphere. A significant fraction of the total t...

[1] Using a time series of TerraSAR-X spaceborne radar images we have measured the pulsatory motion of an andesite lava flow over a 14-month period at Bagana Volcano, Papua New Guinea. Between October 2010 and December 2011, lava flowed continuously down the western flank of the volcano forming a 3 km-long blocky lava flow with a channel, levees, overflows and branches. We captured four success...

Abstract Hekla is an elongate volcano that lies at the intersection of South Iceland Seismic Zone and Eastern Volcanic Zone. We report major trace element, oxygen isotopic, H2O analyses on rocks, glass, melt inclusions, minerals from almost all historical lavas tephra deposits. This new dataset confirms remarkable observation not only are many eruptions compositionally zoned felsic to mafic, bu...