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INTEGRACION DE IMÁGENES ASTER Y DATOS GEOFÍSICOS AEROTRANSPORTADOS PARA EL
RECONOCIMIENTO DE ZONAS DE ALTERACIÓN HIDROTERMAL EN DEPÓSITOS
EPITERMALES-SUR DEL PERUEPITERMALES-SUR DEL PERU
mmayo 2013ayo 2013
Dina Huanacuni Mamani, Dina Huanacuni Mamani, Francisco Zegarra F, Francisco Zegarra F, Juan Casas Juan Casas MalpartidaMalpartida
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CONTENIDOCONTENIDO•• INTRODUCCIONINTRODUCCION
•• OBJETIVOOBJETIVO
•• METODOLOGÍAMETODOLOGÍA
•• CONTEXTO CONTEXTO GEOLÓGICOGEOLÓGICO•• CONTEXTO CONTEXTO GEOLÓGICOGEOLÓGICO
•• CARACTERISTICA ESPECTRAL CARACTERISTICA ESPECTRAL Y MINERALÓGICAY MINERALÓGICA
•• CARACTERIZACIÓN GEOFÍSICACARACTERIZACIÓN GEOFÍSICA
•• DISTRIBUCIÓN DISTRIBUCIÓN DE DEPÓSITOS EPITERMALESDE DEPÓSITOS EPITERMALES
•• CONCLUSIONESCONCLUSIONES
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INTRODUCCIÓNINTRODUCCIÓN
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‘‘SiliceSilice’’
‘Argílica Avanzada’‘Hierro’ ‘Argílica/Fílica’
‘Propilítica’ ‘‘GranateGranate’’
DEMsDEMs
COMPARACIÓN DE BANDAS COMPARACIÓN DE BANDAS ESPECTRALES LANDSAT Y ASTERESPECTRALES LANDSAT Y ASTER
MineralesMinerales oxidrilosoxidrilos ‘‘arcillasarcillas’’‘‘ÓxidosÓxidosrojosrojos’’
‘‘ÓxidosÓxidosamarillosamarillos’’
VNIR SWIR TIR
Source: GRSG Chairman
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UBICACIÓNUBICACIÓN
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Integrar datos geofísicos aerotransportados ycaracterizar minerales de alteración hidrotermalutilizando técnicas de análisis espectral a partir deimágenes ASTER. Para la comprobación de
OBJETIVOOBJETIVO
resultados se ha utilizado el Espectrómetroinfrarrojo portátil –PIMA/SP que identificaasociaciones de minerales en base a suscaracterísticas de absorción y reflexión endeterminadas longitudes de onda.
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METODOLOGÍAMETODOLOGÍA
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- Combinación de bandas
•CORRECCIONESGEOMÉTRICAS (georeferenciación)•CORRECCIONES RADIOMÉTRICAS (calibración)
PRE-PROCESAMIENTO
PROCESAMIENTOSELECCIÓN DE LA ZONA DE TRABAJO
- Combinación de bandas
DETECCIÓN DE ANOMALÍAS
- Cocientes entre bandas
- Análisis de Componentes
Principales (CROSTA)
-Mapeo por ángulo espectral (SAM)
- Mixture Tuned Matched filtering (MTMF)
- Spectral Feature Fitting ( SFF)
CORRELACIÓN
GEOQUÍMICA
GEOFÍSICA
PETROGRAFÍA
GEOLOGÍA
RESULTADOS
-Mapas de
anomalías espectrales
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RGB 3,2,1
RGB 9,3,1
RGB 4,6,8
COMPOSICIÓN DE BANDAS
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COCIENTE DE BANDAS
RGB 4/6, 5/6, 5/8RGB 4/5, 4/6, 4/7
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CONTEXTO GEOLÓGICO
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16°50'0"S
17°0'0"S
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CENTROS VOLCÁNICOS
GRUPO MAURE
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CARACTERIZACIÓN ESPECTRAL Y MINERALÓGICAMINERALÓGICA
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MINERALES DE ALTERACIÓN HIDROTERMAL
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LEYENDA
Puntos de muestra
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Código de muestra R0809-001Código de muestra R0809-001
Código de muestra R0809-002
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Código de muestra R0809-011
Código de muestra R0809-012
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ALTERACIÓN Y MINERALIZACIÓNALTERACIÓN Y MINERALIZACIÓN
Silica oquerosa super-impuesta por Alteración sílice alunita. Relleno deSilica oquerosa super-impuesta poróxidos Fe.
Alteración sílice alunita. Relleno defracturas con alunita cristalizada yóxidos Fe.
Brecha con fracturas rellenas deóxidos Fe y cristales de baritita.
Brecha hidrotermal Mauruma conjarosita y óxidos Fe y tenores de Au0.5-17 g/t.
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MINERALOGIA
Nicoles cruzados
alunita
Nicoles cruzados
Nicoles paralelos
Código de muestraR0809-001alunita
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Muestra de una sección pulida.0.06mm
hm
LIMs
Código de muestra R0809-009
Código de muestra M0809-009
0.3mm
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Muestra de una sección pulida.
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CARACTERIZACIÓNGEOFÍSICAGEOFÍSICA
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LINEAMIENTOS AEROMAGNÉTICOSLINEAMIENTOS AEROMAGNÉTICOS
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DOMINIOS AEROMAGNÉTICOSDOMINIOS AEROMAGNÉTICOS.
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MAPA DE ANOMALÍAS MAPA DE ANOMALÍAS RADIOMÉTRICASRADIOMÉTRICAS
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Santa Rosa
TucariSector de Charaque
PROPILÍTICA
ARGÍLICAARGÍLICA
FILICA
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MAPA DE YACIMIENTOS EPITERMALES DE ORO Y ALTERACIÓN HIDROTERMAL
Santa Rosa- Cacachara
Tucari
Argílica
FílicaPropilítica
Sector de Charaque
ZONAS
A
B
C
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DISTRIBUCIÓN DE DEPÓSITOS EPITERMALESEPITERMALES
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YACIMIENTOS TIPO EPITERMAL DE AuYACIMIENTOS TIPO EPITERMAL DE Au--AgAg
Mina Santa Rosa
Mina Tucari
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ALTERACIÓNALTERACIÓN
Afloramiento de la brechahidrotermal Mauruma
Vista panorámica del tajo de la mina Santa RosaMuestra de mano de la brechaMauruma con Ox Fe (jarosita-gohetita)
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FRANJA METALOGENETICA DE DEPÓSITOS FRANJA METALOGENETICA DE DEPÓSITOS EPITERMALESEPITERMALES
INGEMMET (2012)
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CONCLUSIONESCONCLUSIONES
• La clasificación PCA de imágenes ASTER, es unaherramienta adicional para la determinación ycartografiado de zonas con alteración hidrotermal.
• El procesamiento de datos por Deconvolucionde Euler y Primera Derivada del CMT ende Euler y Primera Derivada del CMT encombinación sirvió para determinar mejor loslineamientos magnéticos con rumbo SW-NE yNW-SE.
• Se reconocieron 3 zonas importantes.