STRUCTURAL STYLES AND 3D RECONSTRUCTION OF SERAM SEA

• Main Author: Patria, Masio
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/77698
• Institution: Institut Teknologi Bandung

The purpose of the research is to understand the structural development in seram sea, particularly in the seram fold thrust belt and its relationship to the tarera aiduna fault zone in the south. Geologically, the area lies on a foreland basin as part of the australia continental plate, locates in the north of banda arc, and extents toward the east. Seram fold thrust belt is an active thrust system since the pliocene to recent. Multibeam bathymetric data in the southeastern part of the study area suggests en-echelon feature, which was formed by movement parallel with the fault strike. The movement was caused by the fault plane dipping in the thrust front, which had relatively bigger dip. Thirteen well data and 160 sections of 2D seismic line within the seram sea are used in the research. Chronostratigraphic correlations were made in the Permian, Jurassic, Cretaceous, Miocene and Pliocene unit. The correlation is based on the similarity of the Seram and West Papua regional stratigraphy, particularly the Pliocene and older section. Seismic interpretation is made with the assumption that folding occured after the faulting, and showed the development of thrust faults in the study area. Bsed on seismic interpretation and 3d structural model, the study area is divided into three structural domain, which are the eastern, middle and western part. This classification represents orientation, age and the fault development mechanism. Structural domain in the eastern part is dominated by reverse faults and asimetrical folding, in nw-se direction dipping to the sw, and deformed the miocene rocks. The middle part domain is presented by en-echelon morphology dominated by reverse and thrust faults also both simetrical and asimetrical folding in a dominant nw-se direction. Faultings within the area move on top of early Pliocene detachment, which then only affected the Pliocene and younger rocks. The western part structural domain is dominated by thrust fault and asimetrical folding in nw-se direction, and defirmed the Permian to Pliocene rocks.