Quaternary Volcanic Ashes in the Narugo and Onikobe Volcanic Areas

Early warning thresholds for partially saturated slopes in volcanic ashes

0266-352X/$ see front matter 2012 Elsevier Ltd. A http://dx.doi.org/10.1016/j.compgeo.2012.11.002 ⇑ Corresponding author. Tel.: +41 21 693 23 14; fax E-mail addresses: [email protected] (J. [email protected] (A. Ferrari), [email protected] (L. Laloui). Rainfall-induced landslides in steep soil slopes of volcanic origin are a major threat to human lives and infrastructure. In the context of ...

Quaternary Volcanism Along the Volcanic Front in Northeast Japan

Petrology and source of Plio-Quaternary volcanic rocks in southwest of Nir, South of Yazd

In the southeast of Nir, south of Yazd Povince, several acidic volcanoes  rocks are exposed and form the youngest volcanic rocks in this region with dacite-rhyodacite composition. These rocks are composed of plagioclase, hornblende, biotite and quartz phenocrysts with trachytic and hyallomicrolithic porphyry texture. Based on geochemical data, the magmatic affinity of these rocks is calc-alkali...

Investigation of mineral chemistry, thermobarometry and fuzzy equilibrium of the basic Plio-Quaternary volcanic rocks in NE Varzeghan

1- Introduction The studied area is situated in northeast Varzeghan in East Azerbaijan Province. In the classification of the structural unites of Iran, this area is a part of Ahar-Arasbaran magmatic arc. The Cenozoic magmatism in the Ahar–Arasbaran region started in the Eocene with an intensive volcanic activity that produced widespread basic to felsic rocks and continued in the Oligo-Miocene...

Chemistry of mafic minerals and thermobarometry of Bazman Quaternary volcanic rocks

  Abstract 1-Introduction Bazman volcano is located on Chgay - Makran magmatic arc. This magmatic arc with east-west trend is 500 km long and 150 km wide and extends from southeastern Iran to southwestern Pakistan. Early evolution of the Makran zone from the upper Oligocene to the upper Miocene is characterized by turbidite sediments deposited on the oceanic crust. There are several quaternary...