| Penulis/Author |
EKO BAYU PURWASATRIYA (1) ; Prof. Dr. Ir. Sugeng Sapto Surjono, S.T., M.T., IPU., ASEAN.Eng. (2); Dr.Ing. Ir. Donatus Hendra Amijaya, S.T., M.T., IPM. (3) |
| Abstrak/Abstract |
Banyumas basin is one of sedimentary basin in Central Java. Based on surface geological mapping we can found many turbidite sediment in this area. Turbidite sediment is a sedimentary rocks with certain sedimentary structure such as graded bedding, paralel lamination, cross lamination or wavy lamination. Turbidite sediment formed by turbidity current which is caused by the existing of a slope. Several depositional environment which is have a slope can be a candidate as depositional environment of turbidite sediment in Banyumas Basin. Previous researcher always refer it to submarine fan depositional environment, because it is believed that Banyumas is a deep marine in the past time. But in the recent research, we found a buried volcanic arc in the middle of Banyumas Basin, that means there are several volcano formed at the middle of sea in the past time. Turbidity current cause by the slope of volcano’s flank not the submarine slope. So the new paradigm to understanding the turbidite sediment in Banyumas Basin is Flysch and molasse turbidite sediment. Flysch is a turbidite sediment related to an orogenic process or the birth of a volcano, and molasse is a turbidite sediment related to reworked process of a volcano, such as weathering, erosion, transportation and then re-sedimentation. |
