GEOMOETRY OF ALASKOBONG FOLD
Aswin Mustofa1, Salahuddin Husein2, and Ignatius Sudarno2
1 Student at the Dept. of Geological engineering, Gadjah Mada University
2 Lecture at the Dept. of Geological engineering, Gadjah Mada University
Jl. Grafika 2, Yogyakarta 55281
Abstract
Alaskobong Fold is located in Alaskobong Village, Sumberlawang District, Sragen
Regency, Central Java Province. It lies in the western Kendeng Zone, an area that for
decades have received full attention for hydrocarbon exploration as it is close to the
profilic region of NE Java Basin. The study area is a 300m long gently hill cut by the NS
railroad of Solo-Gundih and thus formed the 20 m separated eastern western walls
showing excellent exposures of the fold outcrops. Tectonics and soft-sediment
deformation developed in the carbonaceous sandstone and marl of the Kerek
Formation and produced a wide variety of geological structures that noticeable along
the eastern and western walls.
The main structure exposed in the central part of the hill is a synformal depression that
have been topographically inverted. Its trend apparently is different on both wall, NESW
in the eastern wall and E-W in the western wall. The northern part is characterized
by vertical beds and intensive strike-slip fault, whilst the western wall exposes gently
westward dips.
Those differences on the structural types and styles indicate a multiphase or
superposed tectonics. This study might provide an important contribution to
understanding of hydrocarbon traps and migration in the western Kendeng Zone.
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