Abstract
A continuous clastic sedimentary rock outcrop in the Karanggayam Area, Kebumen represents the complete deep marine fan facies of the Middle Miocene Lower Penosogan Formation. Lithology association and vertical succession were observed from a 63 meters detailed measured section along the Karanggayam River. This study aims to identify and classify the turbidite succession as well as the depositional environment of the formation within the North Serayu Basin, Central Java. From the bottom to top the Lower Penosogan Formation is divided into: A2, B2, C2, D2 and F2 facies which represents basin plain, overbank (levee and distal levee), crevasse splay, channel-fill and frontal splay facies respectively. Changes in the depositional environment are interpreted to be influenced by the dynamic changes in morphology and global climate change caused by underwater volcanic activity as a result of Middle Miocene tectonic activity.
Highlights
North Serayu Basin is an area that has a fairly large spread of deep-water sediments namely the Waturanda, Penosogan, and Halang Formations
Detailed observation of the formation was carried out to obtain lithology association and vertical succession while chip samples were obtained for detailed petrography and facies analysis
This study focuses in the facies analyses and their relationship adjusted to the turbidite facies models that already exist to ascertain the depositional environments in more detail and determine vertical succession that occurred in the study area (Figure 4)
Summary
North Serayu Basin is an area that has a fairly large spread of deep-water sediments namely the Waturanda, Penosogan, and Halang Formations. These deep-water sediments captures the unique system which represent the various sedimentary structure caused by mixing flow mechanism. Penosogan Formation is one of the deep-water marine formation overlooked by researcher. A little is known about its sedimentology. The continuous outcrop of Penosogan Formation in Karanggayam Area provides the detail observation of deep-water depositional environment system. The study aims to identify facies change and determine the changes in the depositional environment
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