
In Lombok, Rinjani volcano lies approximately 300 km north of the Sunda Trench (also known as Java trench) and is situated about 170 km above the active north dipping Benioff zone. Based on the composition of andesites which have very low Ni concentrations and low, It is suggested that the Rinjani suite is of mantle origin, but that all the andesites and dacites as well as many of the basalts have probably been modified by fractional crystallization processes.








