To investigate the effects of hydrothermal alteration on the chemistry of volcanic rocks, we
analyzed the whole rock chemical composition (major and trace elements, including rare …

We present new major and trace elements and Sr, Nd, Pb, and O isotopic data on basaltic
andesite to rhyolitic volcanic rocks from surface outcrops as well as drill wells from the Los …

The effects of hydrothermal alteration on major, rare-earth, and other trace-element
concentrations in rhyolitic rocks of the Los Azufres geothermal field, Mexico, were …

Hydrothermal alteration is a common process in active geothermal systems and can
significantly change the physiochemical properties of rocks. To improve reservoir …

The Los Humeros geothermal system is composed of more than 2200 m of Quaternary
altered volcanic rocks and an underlying Cretaceous sedimentary sequence. The low …

The Berlin geothermal field (Republic of El Salvador), located about 110 km ESE of the city
of San Salvador, is a water-dominated system with temperature close to 300 C in the …

We present a combined mineralogical, chemical, and Sr-Nd isotopic study of hydrothermal
alteration effects in near-surface Pleistocene rhyolite sampled at two distinct localities from …

Geochemical mass balances, supported by mineral characterization and whole-rock
elemental analyses, were used to decipher the alteration paragenesis and to understand the …

Abstract The Los Humeros geothermal field, located in Puebla State, Mexico, occurs in a
caldera; drillholes to 3000 m depth encountered a sequence of Quaternary lavas and …

Most of the volcanic rocks in the Acoculco geothermal system (AGS), near to the surface
manifestations, are intensively altered. Thirty‐four surface volcanic rocks and five rocks from …