STUDI PENDAHULUAN GEOLOGI GUA LAWA DI PURBALINGGA, JAWA TENGAH
Abstract: Lawa Cave in
Purbalingga Regency is a special type of cave as it formed not at calcareous
rocks like at the usual cave. It is formed by lava flow processes. So, it is
made of an igneous rock and it has an andesit basaltic rock type. Lawa Cave
formed due to lava flow of the volcanic eruption of the Old Slamet Volcano. The
rocks composition of Lawa Cave consists of primary minerals that are
plagioclase and volcanic glass and some secondary mineral like calcite and
ferri oxide which is fill the previous gas pores. Generally, rock fractures in
Lawa Cave is formed as primary joint when the lava flow was cooling down,
tectonic joints is found very limited. Lawa Cave’s direction is controlled by
the flow direction of the melting lava. It’s direction indicate the
paleomorphology of the volcano.
Penulis: Asmoro Widagdo,
Rachmad Setijadi
Kode Jurnal: jptindustridd070050
