Geochemical Investigation of Volcanic Rocks in Japan . (33). Vanadium Content in Volcanic Rocks of the Fuji Volcanic Zone.

Geochemical Constraints on the Origin of Volcanic Rocks from the Andean Northern Volcanic Zone, Ecuador

Whole-rock geochemical data on basaltic to rhyolitic samples from 12 volcanic centers are used to constrain the role of continental crust in the genesis of magmas formed beneath the anomalously wide subduction-related volcanic arc in Ecuador. Relatively homogeneous, mantle-like, isotopic compositions across the arc imply that the parental magmas in Ecuador were produced largely within the mantl...

Geochemical Character of Neogene Volcanic Rocks of the Central Beetle-

Vol ca nic rocks have formed along the length of the North Amer i can Cor dil lera dur ing the Neo gene and Qua ter nary pe ri ods. Vol ca nism of this age is dom i nantly al ka line and ex tends through out cen tral Brit ish Co lum bia and the south ern Yu kon Ter ri tory. Dis tinct prov inces of al ka line magmatism have been iden ti fied in BC, in clud ing the north ern Cor dil lera vol ca n...

Generalized Titanomagnetite in Hawaiian Volcanic Rocks'

A ferromagnetic oxide mineral with spinel structure was separated from Hawaiian volcanic rocks ranging from basalt to trachyte . The chemical compositions of all the specimens have been arranged on an oxygen reaction line, and can safely be interpreted as the result of a process of either oxidation or reduction of material with composition on or near this line. In the trachyte the mineral was f...

Groundwater in Sedimentary, Metamorphic and Volcanic Rocks

Petrology of rocks in the Karik area, east of Meiduk mine of volcanic

Around The Karik village, east of Meiduk mine, Eocene volcanic rocks (andesitic basalt, andesite, dacite and rhyolite) and pyroclastic rocks (agglomerate and tuff) are exposed. These rocks are cut by several andesitic dikes. The major textures in the volcanic rocks are porphyritic and flow textures. The minerals such as plagioclase, alkali feldspar, quartz, pyroxene, amphibole, biotite and opaq...