Fig 3 - uploaded by Cendi Dana
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Dyke remnant outcrop showing columnar joint structure with dip slope about 5-750 in variated direction
Source publication
Andesitic lavas in Kalibawang area are part of Old Andesite Formation (OAF). These lavas represent the first cycle of volcanism in Sunda arc, which marked the earliest development of Sunda arc.
The samples were collected from three locations in the east of Kulon Progo mountains. Detailed petrographic observation is used to characterize the sample...
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