INTEGRACION DE IMÁGENES ASTER Y DATOS … · ALTERACIÓN HIDROTERMAL EN DEPÓSITOS EPITERMALES...

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

RGB 4,6,8

COMPOSICIÓN DE BANDAS

COCIENTE DE BANDAS

RGB 4/6, 5/6, 5/8RGB 4/5, 4/6, 4/7

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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

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 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.

INTEGRACION DE IMÁGENES ASTER Y DATOS … · ALTERACIÓN HIDROTERMAL EN DEPÓSITOS EPITERMALES...

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