... in Chipilapa, Salvador [ Papapanagiotou, 1994 ; Patrier et al ., 1996 ; Bril et al ., 1996 ], Milos, Greece [ Papapanagiotou et al ., 1992 ] and Bouillante, West Indies [ Patrier et al ., 2003 ; Mas et al ., 2006 ; Guisseau et al ., 2007 ]. These geothermal fields give an overview of clay genesis...

... in the Earth. Pérez-Flores M. A. Gómez-Treviño E. 1997 , Dipole-dipole resistivity imaging of the Ahuachapaán-Chipilapa geothermal field, El Salvador : Geothermics , 26 , 657 – 680 . Pérez-Flores M. A. Gómez-Treviño E. Flores C. , 1992 , Resistivity imaging...

...-Chipilapa geothermal field, El Salvador : Geothermics , 26 , 627 – 656 . Roy A. K. Bagchi A. Chatterjee P. Mukherjee A. Brahman C. V. , 1985 , Reconnaissance geophysical investigation for locating source of geothermal energy in Bakreswar area, Birbhum district, West Bengal...

... thermal gradients. In active geothermal systems, Al-rich smectites precipitated from the geothermal solutions at temperatures up to 150 °C ( Inoue et al. 2004 ). In the active geothermal field of Chipilapa ( Papapanagiotou et al. 1993 ; Papapanagiotou 1994 ), montmorillonite has been identified...

... assemblage. The Chipilapa geothermal volcanic field is located in western El Salvador and resulted from the subduction of the Cocos plate under the Caribbean plate (Molner and Sykes 1969). Geothermal activity is displayed by fumaroles and solfatares ( Bril et al. 1996 ; Patrier et al. 1996 ). Mineral...

.... A. Gomez Trevino E. , 1997 , Dipole-dipole resistivity imaging of the Ahuachapan-Chipilapa geothermal field, El Salvador : Geothermics , 26 , 657–680 , doi: 10.1016/S0375-6505(97)00015-1 . GTMCAT 0375-6505 Ptak T. Piepenbrink M. Martac E. , 2004 , Tracer tests...

... at the Pacmanus hydrothermal vent field, Manus basin: An XRD, SEM and AEM-TEM study . Clays and Clay Minerals , 54 , 240 – 251 . Harvey , C.C. and Browne , P.R.L. ( 1991 ) Mixed-layer clay geothermometry in the Wairakei geothermal field, New Zealand . Clays and Clay Minerals , 39 , 614...

... P. , Patrier P. , Lenain J.F. & Beaufort D. ( 1996 ) Fluid-rock interaction in the geothermal field of Chipilapa (El Salvador): Contribution of fluid inclusion data . Eur. J. Mineral . 8 , 515 – 531 . Buatier M.D. , Fruh-Green G.L. & Karpoff A.M...

.... In the present work we extend our investigations in an area located SW the active geothermal field of Bagnore and Piancastagnaio (see Fig. 1 ), where there is no surface evidence of major geothermal manifestations, such as gas emissions (e.g. Frondini et al ., 2009 ), but where anomalies in the geothermal...

.... Bril , H. , Papapanagiotou , P. , Patrier , P. , Lenain , J.F. , and Beaufort , D. ( 1996 ) Fluid-rock interaction in the geothermal field of Chipilapa (El Salvador): Contribution of fluid inclusion data . European Journal of Mineralogy , 8 , 515 – 531 . Chemale Jr...

... metamorphism at the limit of the diagenesis-anchizone. Subsequently, the phyllosilicate clay minerals of the shales underwent significant alteration at diagenetic temperatures (175±25°C as determined by the geochemical model) by the pervasive circulation of fluids activated by the geothermal field. The overall...

... in sedimentary basins: Clues to the origin of the solutes . Geochimica et Cosmochimica Acta , 57 , 429 – 437 . Christidis , G.E. ( 1995 ) Mechanism of illitization of bentonites in the geothermal field of Milos Island Greece: Evidence based on mineralogy, chemistry, particle thickness...

... that fluid-flow type (channel flow and diffuse flow) was the dominant control on the formation of interstratified clay minerals in the active Wairakei geothermal field, New Zealand, noting that a traditional I–S sequence was present in low-permeability lacustrine sediments and breccias, whereas illite...

... with paragonite, taking account of the non-exchangeable Na content (Table 2 ). Table 2. Chemical compositions of smectite, I-S minerals, and illite in drill holes IT-2 and IT-8 of the Kakkonda geothermal field. Samples 2-125 2-214 2-320 2-435 2-580 2-635 2-645 2-656 2-664...

... at passive margins and geothermal systems at active margins. The morphology, structure and compositional fields of the diagenetic Fe-rich chlorite may have been inherited from those of the berthierine precursor. All of the chlorite species formed through the DC mechanism have good geothermometry potential...

... . Cathelineau M. , Oliver R. , Nieva D. & Garfias A. ( 1985 ) Mineralogy and distribution of hydrothermal mineral zones in Los Azufres (Mexico) geothermal field . Geothermics , 14 , 49 – 57 . Cathelineau M. , Mosser-Ruck R. & Charpentier D. ( 2001...

... in active geothermal systems , in Kharaka , Y.K. , and Chudaev , O.V. , eds., Water-Rock Interaction : Rotterdam , Balkema , p. 493 – 496 . Browne , P.R.L. , 1978 , Hydrothermal alteration in active geothermal fields : Annual Review of Earth and Planetary Sciences , v. 6 , p...

...Figure 14 Logarithmic plot of the molar ratios of ethane to propane to that of methane to ethane in gases from fumaroles (triangles) and geothermal wells (circles) from the Berlin and Ahuachapan-Chipilapa geothermal fields in El Salvador (on a H 2 O-free basis; modified after Tassi et al. 2007...