Hydro-geochemical and isotopic fluid evolution of the Los Azufres geothermal field, Central Mexico

Radium depletion and 210Pb/226Ra disequilibrium of Mar^|^iacute;taro hydrothermal deposits, Los Azufres geothermal field, Mexico

“…The leaching of uranium mill tailings and associated metal oxides ores by acidic waters at pH from 2 to 5, remobilize large quantities of radionuclides creating an important environmental problem. Marítaro effluents are strongly acidic with a measured pH of 3.2 (Birkle et al, 2001) to 3.9 (Gonzales-Partida et al, 2005). Thus, the anomalous depletion of radium in our core could be explained by the occurrence of acidic fluids at Marítaro.…”

“…Vent activity changes continuously in intensity and location as observed during 2007, 2009 and 2010 surveys. Hydrothermal activity is sustained with the direct rise of a "pristine" geothermal liquid and vapor phase to the surface at temperatures of 88-91°C (Birkle et al, 2001;Gonzales-Partida et al, 2005). Fluids are highly mineralized (Birkle et al, 2001) and contain almost pure mantle helium with a measured 3 He/ 4 He ratio of 7.0 Ra (where Ra is the atmospheric ratio) (Pinti et al, 2013).…”

“…Secondary minerals produced by the weathering of volcanic rocks by medium-high temperature hydrother- Barragan et al (2005); Gonzales-Partida et al (2005). Bagnes has been measured twice to check local variability.…”

Characterizing hydrochemical properties of springs in Taiwan based on their geological origins

“…Major ions in spring water include HCO − 3 , Cl − , SO 2− 4 , SiO 2 , Na + , K + , Ca 2+ , and Mg 2+ , which mainly originates from dissolution and mineralization of rock (Davisson et al 1994;Minissale et al 1997;Afşin et al 2006;StambukGilijanovic 2008). Therefore, water quality of springs is highly associated with their geological conditions and evolution, and the hydrochemical composition of spring water can indicate the geological origin (González-Partida et al 2005;Sanada et al 2006;Tarits et al 2006). Furthermore, temperatures and pH of springs exhibit high variability (Hsu et al 2006), resulting in significant difference in species and quantities of hydrochemical parameters.…”

Variación en la composición isotópica del agua meteórica a lo largo de la sección centro-noreste de la Sierra Madre Oriental

“…Hasta el momento, sólo existe un estudio sistemático en México enfocado en determinar la línea de agua meteórica local en asociación con un orógeno (Pérez Quezadas et al, 2015). Los estudios existentes sobre la composición isotópica del agua meteórica son de escaso alcance, y están mayoritariamente relacionados con estudios de origen del agua en campos geotérmicos (e.g., Truesdell et al, 1978;Tello, 1982;González-Partida et al, 2005;Birkle et al, 2016). En el presente estudio se analizan las variaciones en la composición isotópica de agua meteórica en una sección del Cinturón de Pliegues y Cabalgaduras Mexicano (CPCM), a fin de obtener sólo las variaciones debidas al incremento en la elevación topográfica.…”