a r t i c l e i n f o The silicic dome complex of Santiaguito, Guatemala, has exhibited continuous extrusive activity for 90 years. Despite its longevity, remarkably little is known about the magmatic plumbing system beneath Santiaguito. Here, we use petrological analyses of lava samples to define this plumbing system, from storage in the lower to mid-crust through to extrusion onto the surface...

Amphiboles are hydrous minerals that formed in the oceanic crust via hydrothermal alteration. The partial substitution of halogens for OH? makes amphibole one principal hosts Cl and F subducting slab. In this study, we investigated electrical conductivity a suite halogen bearing at 1.5 GPa up to 1,400 K. discontinuous behavior indicates dehydration ?915 This is followed by induced melting tempe...

Occupational exposure to asbestos fiber of brake repair job (auto mechanics) has seldom been evaluated in Iran. Accordingly, we evaluated asbestos fiber concentrations in the breathing zone of auto mechanics between July 2008 and December 2008. The asbestos fiber concentrations of 60 personal air samples collected from 30 cars and trucks brake replacement and they were analyzed by phase-contras...

A new mineral species, lavinskyite, ideally K(LiCu)Cu6(Si4O11)2(OH)4 (IMA 2012-028), has been found in the Wessels mine, Kalahari Manganese Fields, Northern Cape Province, South Africa. Associated minerals include wesselsite, pectolite, richterite, sugilite, and scottyite. Lavinskyite crystals are tabular [parallel to (010)]. The mineral is light blue, transparent with very pale blue streak and...