A new clock reaction based on chlorate, iodine and nitrous acid is presented. The induction period of this new clock reaction decreases when the initial concentrations of chlorate, nitrous acid and perchloric acid increase, but it is independent on the initial iodine concentration. The proposed mechanism is based on the LLKE autocatalytic mechanism for the chlorite-iodide reaction and the initi...

This paper presents an interdisciplinary study of the Northern Chile Double Seismic Zone. First, a high resolution velocity structure of the subducting Nazca Plate has been obtained by a new double­difference tomography method. The double seismic zone (DSZ) is observed between 80 and 140 km depth and the two seismic planes are 20 km apart. Then, the chemical and petrologic characteristics of t...

Abstract The Birimian and Tarkwaian aquifer systems are the main sources of water supply for Bosome Freho District Bekwai Municipality inhabitants in Ashanti region Ghana. A hydrogeochemical assessment was carried out to ascertain natural baseline chemistry groundwaters factors influencing groundwater these two areas. multivariate statistical tool consisting principal component analysis (PCA) h...

The development of lowand hightemperature alteration products in a 23 m section of ocean-floor basalts is described. Analcime, calcite and dioctahedral smectite are ubiquitous. Trioctahedral smectite, smectite-chlorite mixed layers, chabazite and scolecite occur in the deeper sections with Fe 3+ oxides/ hydroxides progressively becoming more abundant in the upper regions. The upper layers of th...

The Mars Exploration Rover Spirit investigated the igneous and alteration mineralogy and chemistry of Home Plate and its surrounding deposits. Here, we focus on using thermochemical modeling to understand the secondary alteration mineralogy at the Home Plate outcrop and surrounding Columbia Hills region in Gusev crater. At high temperatures (300 °C), magnetite occurs at very high W/R ratios, bu...

Chlorite-coats on quartz surfaces are ubiquitous in various sedimentary environments. shield the surface of from cement overgrowths, thus preserving anomalously high porosity deeply buried sandstone reservoirs. The inhibition implies that chlorite-coats grains can significantly influence physicochemical behavior grains. Therefore, failure to notice initial thin microscale coatings forming durin...

Abstract The slab–mantle interface in subduction zones is one of the geological boundaries with most significant chemical potential gradients, which leads to fluid-mediated metasomatic reactions and transport. As subducting sediment basaltic crust often contain silica various forms, Si-metasomatism mantle rocks thought occur along zone interface. However, growing evidence from geochemistry alte...