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Strike-Slip Tectonic Controlled Deepwater Channel Sedimentation in Western Border of Kendeng Basin, Java


Kendeng basin is a deep flexural basin in Java. Previous paleogeographic model proposed Neogene sedimentation of whole areas supllied from Oligocene-Early Miocene inactive Southern Mountain Arc. New data from surface and gravity shows western end of the basin is controlled by NE-SW trending sinistral strike-slip Muria-Karangsambung fault. The structure act as tectonic high since Paleogene, associated with initiation, growth, termination and uplifting of submerge Neogene Proto Ungaran Volcano, younger than Southern Mountain Arc. Significant explosive activity in relatively short-live duration supplied volcaniclastic materials that spread to the easternmost transport direction result different characteristic of submarine channel. This research is focus to evaluate this deepwater channel sedimentation. Litofacies consist of andesitic-pumice gravelly sandstone, laminated sandstone and tuffaceous mudstone. Width of channel exceed 2.3 km and thickness of channel axis exceed 2.5 m. Much more volume of tuffaceous mud with strongly cohessive character avoid erosion from new channel sedimentation. Consequence isolated channel formed although high sediment supply happened. The cycle of channel sucession is related to progressive uplift caused by transpressional mechanism of Muria-Karangsambung tectonic activity.