The Neogene tectonostratigraphic evolution of Java, Indonesia

This field-based study gives an account of the Neogene structural and stratigraphic development of Java, and the timing and causes of deformation. In this study the stratigraphy and structural domains of Java have been described based on observations made at outcrop. A new stratigraphic scheme for Java is presented calibrated by faties analysis plus forminiferal and nannofossil biostratigraphy. Three separate periods of volcanism have been recognised affecting Java during the Neogene since the extinction of the OJigo-Miocene Arc. Major eruptive episodes occurred between 11.5- lOMa, 6.5-5Ma and from l.8Ma onwards. Deposition between these eruptive periods was dominated bv the reworking of volcanic debris dose to dormant volcanic centres, and carbonate deposition in the more distal areas. The volcan ic arc was notably absent from East Java during the late Miocene and Pliocene, while voluminous volcanism occurred In West and Central Java at the same time. The lateral variation in vo lcanism can be linked to subduction processes. Two distinct phases of tectonic deformation and uplift have been identified which affected Java during the Neogene. The first late Miocene phase affected much of West Java and the continental shelf of northern East Java. The second phase of deformation affected the entire is land during the Pleistocene and uplifted the former sedimentary basins above sea level into fold and thrust belts.EThOS - Electronic Theses Online ServiceGBUnited Kingdo