A proposed new model for the tectonic evolution of South Java, Indonesia

Cenozoic History of The East Java Forearc

“…The ages of zircons from Cenozoic igneous and sedimentary rocks indicates at least the southern part of East Java is underlain by ancient Gondwana continental crust (Smyth, 2005;Smyth et al, 2005Smyth et al, , 2007Smyth et al, , 2008. Seubert & Sulistianingsih (2008) speculated that there were several continental fragments accreted to Java that underlie the Southern Mountains. Continental crust beneath the East Java Sea was proposed by Manur & Barraclough (1994) based on granitic rocks sampled in an oil-exploration well.…”

“…The lower part is interpreted as carbonate mudrock, while the upper part could be mudrock or tuff. To the east close to Lombok Basin, Unit B thins towards the forearc basin depocentre ( Figure 10) where it is interpreted to have been deposited above a paleo-high, suggested by a high positive gravity anomaly across the eastern part of the East Java forearc (Seubert & Sulistianingsih, 2008). This unit has been uplifted and eroded in the outer arc ridge and forearc flank (Figure 9).…”