| Summary: | Indonesia as an archipelagic country, has a huge potential of mineral
resources. This because Indonesia is a country surrounded by old and young
volcanoes. West borneo, geologically is an old volcanic areas may indicate
hydrothermal alteration rocks. Hydrothermal alteration rocks can be use for
indicator of a variety of minerals.
LANDSAT 7 ETM + imagery and ASTER G-DEM imagery as remote sensed
data with a variety of image processing techniques such as Principal Component
(PC) fusion, Intensity, Hue, and Saturation (IHS) fusion, image fusion from Band
Ratioing method and spatial filtering needs to be compared to know the best
image processing. In addition, the physical aspects of terrain such as landforms,
rocks (lithology), and geological structure analysis also needs to be done related t
identification of hydrothermal alteration zones.
This study aimed to determine the ability of some image processing
techniques in identification of hydrothermal alteration zones and mapping
hydrothermal alteration zones associated with landforms, rocks (lithology), and
structural geology.
Physical aspects of terrain parameters obtained through visual
interpretation of landforms, rock (lithology), and geological structures assisted
with image processing techniques. In addition a laboratory analysis like
petrographic analysis was conducted to find the mineral content of the rocks for
determination of hydrothermal alteration zones.
Results of the analysis showed Principal Component (PC) fusion techniques
has the highest accuracy of landform with 71.15%. Highest accuracy for rocks
(lithology) is 70.98% from Intensity, Hue, and Saturation fusion techniques.
Mapping of hydrothermal alteration zones shows 4 hydrothermal alterated zones,
there are Argilic alteration zone with an area of 1399,42 km
2
, 2913,46 km
2
zone
of potassic alteration, Propilitic alteration zone 1160,54 km
2
, and 946,38 km
2
zone of Serisitic alteration.
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