Mineralogical and geochemical effects due to hydrothermal alteration in the Los Azufres geothermal field, Mexico
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2007
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| _version_ | 1876486623255855104 |
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| author | Kailasa Pandarinath |
| author_facet | Kailasa Pandarinath |
| contents | Mineralogical and geochemical effects due to hydrothermal alteration in the Los Azufres geothermal field, Mexico Kailasa Pandarinath Peter Dulski Ignacio S. Torres Alvarado Surendra P. Verma Ciencias de la Tierra REE HFSE water Mexico Los Azufres To investigate the effects of hydrothermal alteration on the chemistry of volcanic rocks, we analyzedthe whole rock chemical composition (major and trace elements, including rare-earth elements REE)of two distinct portions of a drill well core sample from the Los Azufres geothermal field, Mexico. Thishighly hydrothermally-altered sample allowed us to study, for the first time, the mineralogical andchemical effects imposed by hydrothermal alteration on the mm scale in this important geothermal system.Mineralogically, hydrothermal alteration in the sample is mainly represented by chloritization of primaryolivine and pyroxene, argillitization of primary plagioclase, as well as banded chlorite and quartz, withsignificant amounts of epidote and hematite. The "altered" part of the sample contains intensely alteredremnants of the fresh rock, which show intense silicification, hematization, and dissolution boundaries.Most major and trace elements were mobilized from the original rock. Major element compositionreflects the silicification, chloritization, and epidotization processes taking place in the geothermalsystem. The rare-earth elements La and Ce, as well as Yb and Lu were probably partially re-depositedduring alteration. The positive anomaly of Eu may suggest that Eu is being concentrated in hydrothermalepidote after its release from plagioclase to the geothermal fluid. The high-field strength elements suchas Zr, Ti, and P, show as well significant hydrothermal alteration-related decrease in the highly-alteredrock. The geothermal fluid responsible for this hydrothermal alteration was probably oxidizing, of hightemperature (>250º C), and enriched in REE and other trace elements. 2007 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57224102 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.24 |
| format | Artículo científico |
| id | redalyc_57224102 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Mineralogical and geochemical effects due to hydrothermal alteration in the Los Azufres geothermal field, Mexico Kailasa Pandarinath Ciencias de la Tierra REE HFSE water Mexico Los Azufres Mineralogical and geochemical effects due to hydrothermal alteration in the Los Azufres geothermal field, Mexico Kailasa Pandarinath Peter Dulski Ignacio S. Torres Alvarado Surendra P. Verma Ciencias de la Tierra REE HFSE water Mexico Los Azufres To investigate the effects of hydrothermal alteration on the chemistry of volcanic rocks, we analyzedthe whole rock chemical composition (major and trace elements, including rare-earth elements REE)of two distinct portions of a drill well core sample from the Los Azufres geothermal field, Mexico. Thishighly hydrothermally-altered sample allowed us to study, for the first time, the mineralogical andchemical effects imposed by hydrothermal alteration on the mm scale in this important geothermal system.Mineralogically, hydrothermal alteration in the sample is mainly represented by chloritization of primaryolivine and pyroxene, argillitization of primary plagioclase, as well as banded chlorite and quartz, withsignificant amounts of epidote and hematite. The "altered" part of the sample contains intensely alteredremnants of the fresh rock, which show intense silicification, hematization, and dissolution boundaries.Most major and trace elements were mobilized from the original rock. Major element compositionreflects the silicification, chloritization, and epidotization processes taking place in the geothermalsystem. The rare-earth elements La and Ce, as well as Yb and Lu were probably partially re-depositedduring alteration. The positive anomaly of Eu may suggest that Eu is being concentrated in hydrothermalepidote after its release from plagioclase to the geothermal fluid. The high-field strength elements suchas Zr, Ti, and P, show as well significant hydrothermal alteration-related decrease in the highly-alteredrock. The geothermal fluid responsible for this hydrothermal alteration was probably oxidizing, of hightemperature (>250º C), and enriched in REE and other trace elements. 2007 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57224102 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.1 Vol.24 |
| title | Mineralogical and geochemical effects due to hydrothermal alteration in the Los Azufres geothermal field, Mexico |
| topic | Ciencias de la Tierra REE HFSE water Mexico Los Azufres |
| url | https://www.redalyc.org/articulo.oa?id=57224102 |