Post on 05-Oct-2018
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
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
INTRODUCCIÓNINTRODUCCIÓN
‘‘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
UBICACIÓNUBICACIÓN
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.
METODOLOGÍAMETODOLOGÍA
- 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
RGB 3,2,1
RGB 9,3,1
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COMPOSICIÓN DE BANDAS
COCIENTE DE BANDAS
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70°6'0"W70°16'30"W70°27'0"W
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CENTROS VOLCÁNICOS
GRUPO MAURE
CARACTERIZACIÓN ESPECTRAL Y MINERALÓGICAMINERALÓGICA
MINERALES DE ALTERACIÓN HIDROTERMAL
LEYENDA
Puntos de muestra
Código de muestra R0809-001Código de muestra R0809-001
Código de muestra R0809-002
Código de muestra R0809-011
Código de muestra R0809-012
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.
MINERALOGIA
Nicoles cruzados
alunita
Nicoles cruzados
Nicoles paralelos
Código de muestraR0809-001alunita
Muestra de una sección pulida.0.06mm
hm
LIMs
Código de muestra R0809-009
Código de muestra M0809-009
0.3mm
gn
py
GGs
Muestra de una sección pulida.
CARACTERIZACIÓNGEOFÍSICAGEOFÍSICA
LINEAMIENTOS AEROMAGNÉTICOSLINEAMIENTOS AEROMAGNÉTICOS
DOMINIOS AEROMAGNÉTICOSDOMINIOS AEROMAGNÉTICOS.
MAPA DE ANOMALÍAS MAPA DE ANOMALÍAS RADIOMÉTRICASRADIOMÉTRICAS
Santa Rosa
TucariSector de Charaque
PROPILÍTICA
ARGÍLICAARGÍLICA
FILICA
MAPA DE YACIMIENTOS EPITERMALES DE ORO Y ALTERACIÓN HIDROTERMAL
Santa Rosa- Cacachara
Tucari
Argílica
FílicaPropilítica
Sector de Charaque
ZONAS
A
B
C
DISTRIBUCIÓN DE DEPÓSITOS EPITERMALESEPITERMALES
YACIMIENTOS TIPO EPITERMAL DE AuYACIMIENTOS TIPO EPITERMAL DE Au--AgAg
Mina Santa Rosa
Mina Tucari
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)
FRANJA METALOGENETICA DE DEPÓSITOS FRANJA METALOGENETICA DE DEPÓSITOS EPITERMALESEPITERMALES
INGEMMET (2012)
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.