Introduction Damavand volcano is a large composite cone (≥ 400 km3) with height elevation (5678m) above sea level, in Central Alborz. This volcano consists of two buildings including old lavas between 1.8 to 0.8 Ma in the northern and eastern part of the current cone and young lavas with about 0.4 to 7 ka years in the south and west part. Trachytic and trachy-andesitic lavas are the most abund...

Andesitic pumice erupted in 1985 from Nevado del Ruiz volcano (Colombia) has been magnetized in opposite direction t o the present geomagnetic field. This self-reversal is probably due t o an exchange mechanism between two phases of the haematite-ilmenite series, which is similar to the magnetic coupling observed in synthetically grown antiferromagnetic-ferromagnetic FeMn-FeNi films produced un...

The S ile Region contains discontinuous, cyclic, thin coal beds and industrial clay deposits that were accumulated in lacustrine basins which received extensive volcanoclastic sediments due to transport of highly weathered calc-alkaline volcanic rocks. The Sülüklü area has the largest kaolin deposit in this region. Cyclic kaolinization depended on the degree of leaching of Si and alkalis in cyc...

Egmont Volcano (Mt Taranaki) is located 140 km west of the INTRODUCTION Taupo Volcanic Zone (TVZ), the principal locus of volcanic activity Egmont Volcano is a 2518 m high stratovolcano (Mt in the North Island of New Zealand, and is one of four closely Taranaki) resting on an extensive ring plain of volcanic associated Quaternary andesitic volcanoes in Taranaki province. debris in Taranaki prov...

Signals of volcanic unrest do not usually provide insights into the timing, size and style future eruptions, but detailed analysis past eruptions may uncover patterns that can be used to understand eruptive behavior. Here, we examine basaltic-andesitic andesitic eruption deposits from La Soufrière de Guadeloupe, covering a range styles, ages magnitudes. Our work is timely given at Guadeloupe ha...

In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: The temporal evolution of pedogenic Fe–smectite to Fe–kaolin via interstratified kaolin–smectite in a moist tropical soil ch...

Abstract Granitoids with diverse composition and tectonic settings provide important tools for exploring crustal evolution regional geodynamic history. Here we present an integrated study using petrological, mineralogical, zircon U-Pb geochronological, whole-rock geochemical, isotopic data on the Late Triassic Daocheng batholith in Yidun Terrane a view to understanding petrogenesis of compositi...

We have determined the S contents of 14 different silicate melts equilibrated with Air/SO2 mixtures at 1 atm pressure and temperatures 1473–1773 K in 50 intervals. Under these oxidizing conditions sulfur dissolves predominantly as sulfate (S6+ or SO42–). The quenched products were by EPMA (Electron Probe Micro-Analysis) SIMS (Secondary Ion-Mass Spectrometry) latter being employed for low (i.e.,...