Mount Rinjani is a mountain located on Lombok Island, West Nusa Tenggara, Indonesia. The mountain which is the second highest volcano in Indonesia with an altitude of 3,726m above sea level and it is a favourite mountain for Indonesian climbers because of the beauty of the scenery. This mountain is part of the Mount Rinjani National Park which has an area of about 41,330 ha and this addition will be proposed to be 76,000 ha to the west and east.
On the basis of plate tectonics theory, Rinjani is one of the series of volcanoes built in the Lesser Sunda Islands due to the subduction of Indo-Australian oceanic crust beneath the Lesser Sunda Islands, and it is interpreted that the source of melted magma is about 165–200 kilometres (103–124 mi) depth.
The geology and tectonic setting of Lombok (and nearby Sumbawa) are described as being in the central portion of the Sunda Arc. The oldest exposed rocks are Miocene, suggesting that subduction and volcanism began considerably later than in Java and Sumatra to the west, where there are abundant volcanic and intrusive rocks of Late Mesozoic age. The islands are located on the eastern edge of the Sunda shelf, in a zone where crustal thickness is apparently rapidly diminishing, from west to east.
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