THE GEOLOGY OF INDONESIA (The Lesser Sunda Islands)

Jun 28th, 2015
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The Lesser Sunda islands (LSI) are defined as a group of small islands situated between east of Java Island and Banda Islands, which are part of Western Banda Arc. Geologically, they constitute the inner outer arc built by Tertiary volcanic arc and some of the young volcanoes are still active.

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THE GEOLOGY OF INDONESIA(The Lesser Sunda Islands)By: Riki Rahmad, M.Sc.The Lesser Sunda islands (LSI) are defined as a group of small islands situated between east of Java Island and Banda Islands, which are part of Western Banda Arc. Geologically, they constitute the inner outer arc built by Tertiary volcanic arc and some of the young volcanoes are still active. The arc is a south-facing island arc, which is the eastward continuation of the Sumatra-Java island arc system of Indonesia (Cardwell and Isack 1981). In terms of Plate Tectonic theory, the series of volcanoes built in the LSI is due to the subduction of Indo-Australian Oceanic crust beneath the LSI, and it is interpreted that the sources of melted magma from the subducted oceanic is about 165-190 Km depth (Hamilton 1979).The oldest rock exposed in LSI is of Miocene age. Whereas to the western part of the islands (Sunda Arc) Mesozoic sequences are common (Foden and Varne 1981, Katili 1975). This indicates that the arc is relatively young tectonic product in the Indonesian Archipelago.The systematic relationship between volcanoes, earthquake and active tectonics features at the region can give a better understanding of the present tectonics of the LSI. Although these phenomena are mainly considered due to the fact that the lithosphere of the Indian-Australian plate is being subducted beneath the Banda Arc, but the tectonic process are different from one place to other places along the subduction. These result i

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