GEOLOGI DAN PETROGENESA BATUAN ANDESIT DESA SUMBERTANGKIL DAN SEKITARNYA KECAMATAN TIRTOYUDO KABUPATEN MALANG PROPINSI JAWA TIMUR
The research setting, administratively, is located in Sumbertangkil Village and its
surrounding, Tirtoyudo District, Malang Regency, East Java Province. It is
astronomically located at the coordinates of X: 700000-708000 and Y: 90790009084000.
consisting of geomorphology, stratigraphy, geological structure,
geological history, and petrogenesis determination of andesite rock.
Based on the analysis result of petrography, the dominant andesite rock found in
the research setting is basaltic andesite with smooth-middle grain size. The
mineral compositions are plagioclase feldspar (40%), pyroxene (15%), glass
(15%), opaque (5%), and base mass of glass (40%). In short, the andesite rock on
the research setting was formed extrusively (lava).
Based on the relief, lithology, genesis, and morphology appearance in the field,
the landforms of research setting are Structural (S), Denudasional (D), and
Fluvial (F). The sequence of rock units from old to young on the research setting
are tuff, volcanic breccias, andesitic lava, coal-inserted limestone, and
sedimentary alluvial as the youngest unit in the research setting.
Key words: Andesite, Malang, Lithology.
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