Spatial and Temporal Relationships between Hydrothermal Alteration Assemblages at the Palinpinon Geothermal Field, Philippines—Implications for Porphyry and Epithermal Ore Deposits

2005 ◽  
pp. 223-246
Keyword(s):  
Hydrothermal Alteration ◽  
Geothermal Field ◽  
Ore Deposits ◽  
Temporal Relationships

Hydrothermal alteration effects in geochemistry and Sr, Nd, Pb, and O isotopes of magmas from the Los Azufres geothermal field (Mexico): A statistical approach

2005 ◽  
Vol 39 (2) ◽  
pp. 141-163 ◽  
Author(s):  
Surendra P. Verma ◽  
Ignacio S. Torres-Alvarado ◽  
Muharrem Satir ◽  
Patrick F. Dobson
Keyword(s):  
Hydrothermal Alteration ◽  
Statistical Approach ◽  
Geothermal Field ◽  
O Isotopes

Mineralogical, chemical, and Sr-Nd isotopic effects of hydrothermal alteration of near-surface rhyolite in the Los Azufres geothermal field, Mexico

Lithos ◽  
2018 ◽  
Vol 322 ◽  
pp. 347-361
Author(s):  
Surendra P. Verma ◽  
Kailasa Pandarinath ◽  
Rajneesh Bhutani ◽  
Jitendra K. Dash
Keyword(s):  
Hydrothermal Alteration ◽  
Geothermal Field ◽  
Near Surface ◽  
Isotopic Effects

A rock magnetic fingerprint of hydrothermal alteration in volcanic rocks - An example from the Los Azufres Geothermal Field, Mexico

2019 ◽  
Vol 91 ◽  
pp. 260-271
Author(s):  
Kailasa Pandarinath ◽  
Rajasekhariah Shankar ◽  
E. Santoyo ◽  
Shwetha B. Shetty ◽  
America Yosiris García-Soto ◽  
...  
Keyword(s):  
Hydrothermal Alteration ◽  
Volcanic Rocks ◽  
Geothermal Field

scholarly journals Remote sensing of surface Hydrothermal Alteration, identification of Minerals and Thermal anomalies at Sveifluháls-Krýsuvík high-temperature Geothermal field, SW Iceland

2019 ◽  
Vol 254 ◽  
pp. 012005
Author(s):  
Lucía Magali Ramírez-González ◽  
Muhammad Aufaristama ◽  
Ingibjörg Jónsdóttir ◽  
Ármann Höskuldsson ◽  
þorvaldur þórðarson ◽  
...  
Keyword(s):  
Remote Sensing ◽  
High Temperature ◽  
Hydrothermal Alteration ◽  
Geothermal Field ◽  
Thermal Anomalies

Element mobility during the hydrothermal alteration of rhyolitic rocks of the Los Azufres geothermal field, Mexico

Geothermics ◽  
2008 ◽  
Vol 37 (1) ◽  
pp. 53-72 ◽  
Author(s):  
Kailasa Pandarinath ◽  
Peter Dulski ◽  
Ignacio S. Torres-Alvarado ◽  
Surendra P. Verma
Keyword(s):  
Hydrothermal Alteration ◽  
Geothermal Field ◽  
Element Mobility

Acid-sulphate hydrothermal alteration of andesitic tuffs and genesis of halloysite and alunite deposits in the Biga Peninsula, Turkey

Clay Minerals ◽  
2008 ◽  
Vol 43 (2) ◽  
pp. 281-315 ◽  
Author(s):  
Ö. I. Ece ◽  
P. A. Schroeder ◽  
M. J. Smilley ◽  
J. M. Wampler
Keyword(s):  
Hydrothermal Alteration ◽  
Volcanic Rocks ◽  
Geothermal Field ◽  
Parent Material ◽  
Thermal Waters ◽  
Geothermal Waters ◽  
Biga Peninsula ◽  
The North ◽  
Clay Deposits ◽  
Nw Turkey

AbstractThe Biga Peninsula of NW Turkey is host to six major halloysite deposits in the Go¨nen, Yenice and Balya districts. Mineralization took place in areas of Permian limestone blocks where the Triassic Karakaya Complex is in contact with early Miocene calc-alkaline volcanic rocks. Hypogene halloysite mineralization was controlled by the intersection of minor faults in the vicinity of clay deposits. During the Pleistocene, activity of the North Anatolian Fault (NAF) brought ascending geothermal solutions through the fault zones to the surface, which led to hydrothermal alteration and halloysite formation. N-MORB normalized element values for each halloysite deposit and the volcanic rocks suggest genetic links. Alunite and halloysite were formed in the Turplu area where upwelling hydrothermal waters contained major H2S and SO2acids. Only halloysite mineralization occurred in outflow areas of the same fossil geothermal field.Pyrite and alunite samples from the Turplu deposits have δ34S values of 0.6–1.8% and 4.8–7.9%, respectively, with values for gypsum of 3.1–3.5%. The δ34S values of pyrite suggest that local meteoric waters had partially mixed with the dominant fluid during the closure stage of fossil hydrothermal activities. The range of δD values of halloysite samples from Turplu is –58.4 to –68.6%. The δ18O values for halloysite are in the range 16.7–18.1%. All halloysite deposits in the study areas are either overlying or adjacent to limestone blocks, and these provide excellent drainage for the discharging geothermal waters. Subsurface drainage systems in the karstic environment and the SO2-bearing thermal waters indicate the importance of acidic waters and the continuous leaching of elements in forming relatively pure hydrated halloysite. A steam-heated dissolution-precipitation model is proposed for the occurrence of all halloysite and alunite deposits. Sulphur gases (H2S-SO2) of hypogene origin rose from deep in the fault zone to the surface where they encountered oxygenated groundwater at the water table. The occurrence of H2SO4in this hydrothermal system enhanced the acidity of geothermal waters provoking advanced argillic alteration. Hypogene alunite deposits also have large P2O5contents, suggesting a parent material with a magmatic origin deeper than the alkaline tuffs. Halloysite is a fast-forming metastable precursor to kaolinite.

scholarly journals Hydrothermal alteration and main structures mapping using TM images in La Primavera geothermal field (Mexico)

2001 ◽  
Vol 40 (3) ◽  
pp. 147-162
Author(s):  
T. Fernández de la Vega-Márquez ◽  
R. M. Prol-Ledesma ◽  
G. Orozco
Keyword(s):  
Hydrothermal Alteration ◽  
Geothermal Field ◽  
Landsat Tm

Imágenes Landsat TM del campo geotérmico de La Primavera se utilizaron para identificar estructuras principales, y localizar áreas que presentan alteración hidrotermal. Los métodos utilizados en el procesamiento de las imágenes incluyen análisis estadístico univariado y multivariado, así como realce espectral y espacial. La vegetación en el área no se compone de plantas con hojas grandes; sin embargo, sí se presenta interferencia entre el espectro de la vegetación y él de la alteración hidrotermal. Para superar esta interferencia, se utilizaron la técnica de Crosta y el método de Loughlin (Crosta and Moore 1989; Loughlin 1991). Como resultado de este procesado, se logró detectar la presencia de minerales que contienen óxidos de hierro e hidroxilos. Las imágenes resultantes fueron desplegadas en tonos de gris y en composiciones de falso color para resaltar las estructuras principales y las rocas alteradas, respectivamente. Las zonas de alteración identificadas presentan una correlación con los flujos de descarga del yacimiento geotérmico, así como con las estructuras principales que controlan la permeabilidad del yacimiento y de la capa sello. Por lo tanto, la localización en la superficie de las rocas alteradas será de gran utilidad en la identificación de la presencia de descargas de fluidos del yacimiento geotérmico.

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