Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan
The advanced spaceborne thermal emission and reflection radiometer (ASTER) was used to identify different deposits of hydrothermal alteration which indicates that several important lithological groups can be mapped in areas with good exposure by using spectral-matching techniques. Different methods...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v66_n4_p623_Perez http://hdl.handle.net/20.500.12110/paper_00044822_v66_n4_p623_Perez |
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paper:paper_00044822_v66_n4_p623_Perez2023-06-08T14:26:26Z Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan Perez, Daniel José Godeas, Marta Carmen ASTER Cordillera Frontal Hydrothermal alteration Miocene Remote sensing San Juan ASTER clay mineral cordillera hydrothermal alteration hydrothermal deposit lithology Miocene multispectral image remote sensing satellite data Andes Argentina Cordillera Frontal San Juan [Argentina] Santa Cruz [Argentina] Santa Cruz River [Santa Cruz] The advanced spaceborne thermal emission and reflection radiometer (ASTER) was used to identify different deposits of hydrothermal alteration which indicates that several important lithological groups can be mapped in areas with good exposure by using spectral-matching techniques. Different methods are tested in order to identify and map zones with hydrothermal alteration minerals using the ASTER dataset. These areas are often referred to having large quantities of clay minerals which can be detected using multispectral imagery. Several authors have developed different procedures to map these hydrothermal minerals. Among the simplest ones, band combinations and band ratios have proven to be very useful tools for identifying targets. Lithology indexes point to reinforce the spectral response of this group of minerals working with band products and ratios. So far, these techniques do not need a full image correction. Other methods here employed require further processing of the ASTER scene, especially when spectral data are used. These techniques include spectral angle mapper (SAM) classification and minimum noise fraction (MNF) transforms to segregate noise and reduce computational requirements. Spectral data used in this paper were collected from field samples using SWIR (short wave infrared) reflectance spectroscopy and derived from the scene itself. These mapping methods have been tested in areas of known hydrothermal alteration occurrences, e.g. Los Pelambres, El Pachón and Altar, and in other sector of Santa Cruz region like Carnicerias and La Coipa; all of these at the south westernmost part of San Juan province. The result of this work is here presented as a series of images showing lithology indexes and an expected mineral assembly. Fil:Pérez, D.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Godeas, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v66_n4_p623_Perez http://hdl.handle.net/20.500.12110/paper_00044822_v66_n4_p623_Perez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
ASTER Cordillera Frontal Hydrothermal alteration Miocene Remote sensing San Juan ASTER clay mineral cordillera hydrothermal alteration hydrothermal deposit lithology Miocene multispectral image remote sensing satellite data Andes Argentina Cordillera Frontal San Juan [Argentina] Santa Cruz [Argentina] Santa Cruz River [Santa Cruz] |
| spellingShingle |
ASTER Cordillera Frontal Hydrothermal alteration Miocene Remote sensing San Juan ASTER clay mineral cordillera hydrothermal alteration hydrothermal deposit lithology Miocene multispectral image remote sensing satellite data Andes Argentina Cordillera Frontal San Juan [Argentina] Santa Cruz [Argentina] Santa Cruz River [Santa Cruz] Perez, Daniel José Godeas, Marta Carmen Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan |
| topic_facet |
ASTER Cordillera Frontal Hydrothermal alteration Miocene Remote sensing San Juan ASTER clay mineral cordillera hydrothermal alteration hydrothermal deposit lithology Miocene multispectral image remote sensing satellite data Andes Argentina Cordillera Frontal San Juan [Argentina] Santa Cruz [Argentina] Santa Cruz River [Santa Cruz] |
| description |
The advanced spaceborne thermal emission and reflection radiometer (ASTER) was used to identify different deposits of hydrothermal alteration which indicates that several important lithological groups can be mapped in areas with good exposure by using spectral-matching techniques. Different methods are tested in order to identify and map zones with hydrothermal alteration minerals using the ASTER dataset. These areas are often referred to having large quantities of clay minerals which can be detected using multispectral imagery. Several authors have developed different procedures to map these hydrothermal minerals. Among the simplest ones, band combinations and band ratios have proven to be very useful tools for identifying targets. Lithology indexes point to reinforce the spectral response of this group of minerals working with band products and ratios. So far, these techniques do not need a full image correction. Other methods here employed require further processing of the ASTER scene, especially when spectral data are used. These techniques include spectral angle mapper (SAM) classification and minimum noise fraction (MNF) transforms to segregate noise and reduce computational requirements. Spectral data used in this paper were collected from field samples using SWIR (short wave infrared) reflectance spectroscopy and derived from the scene itself. These mapping methods have been tested in areas of known hydrothermal alteration occurrences, e.g. Los Pelambres, El Pachón and Altar, and in other sector of Santa Cruz region like Carnicerias and La Coipa; all of these at the south westernmost part of San Juan province. The result of this work is here presented as a series of images showing lithology indexes and an expected mineral assembly. |
| author |
Perez, Daniel José Godeas, Marta Carmen |
| author_facet |
Perez, Daniel José Godeas, Marta Carmen |
| author_sort |
Perez, Daniel José |
| title |
Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan |
| title_short |
Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan |
| title_full |
Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan |
| title_fullStr |
Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan |
| title_full_unstemmed |
Reconnaissance of hydrothermal alteration with the ASTER sensor, in the middle course of Río Santa Cruz (31°40' S), province of San Juan |
| title_sort |
reconnaissance of hydrothermal alteration with the aster sensor, in the middle course of río santa cruz (31°40' s), province of san juan |
| publishDate |
2010 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v66_n4_p623_Perez http://hdl.handle.net/20.500.12110/paper_00044822_v66_n4_p623_Perez |
| work_keys_str_mv |
AT perezdanieljose reconnaissanceofhydrothermalalterationwiththeastersensorinthemiddlecourseofriosantacruz3140sprovinceofsanjuan AT godeasmartacarmen reconnaissanceofhydrothermalalterationwiththeastersensorinthemiddlecourseofriosantacruz3140sprovinceofsanjuan |
| _version_ |
1768545673460842496 |