Publications

The Lengguru fold-and-thrust belt in West Papua (Indonesia) corresponds to the western edge of the Central Papuan Mountains. As this is a remote area, it remains fairly misunderstood. Structural work based on field observation and detailed topographic studies in the entire belt have been discussed in a previous paper. This one showed that the present day structure of the Lengguru belt results from events occurring over a very short time span. Three main stages were noticed, firstly a Late Miocene northeast -southwest compression linked to a subduction process and a second one from Middle Miocene to Early Pliocene, then a Late Pliocene- Quaternary global extension in the whole range. The last stage was linked to the deformation zone jump towards the south onto the Seram wedge (Bailly et al., 2009). The main objective here is to show some of the new high pressure and temperature estimations but also datations of rocks localized in the most internal part of the range, the Wandamen peninsula. Then, we will discuss the impact of these new data on the entire belt building process and present day status.We will present :- A map and a new crustal scale cross-section through the entire belt- Pressure & Temperature estimations of metamorphic rocks- Preliminary datations of zircons included in these rocks- New ideas about the Lengguru belt evolutionKeyword: Lengguru belt, West Papua, young prism, datations, exhumation of HP rocks