Thursday, 12 April 2012

Ancient bowl Basin Bandung (Indonesia)


Bandung and the surrounding area can be likened to a bowl formed by the earth hundreds of thousands of years ago. Landscape is usually called Bandung Basin. Bandung basin-shaped ellipse with the east-south-west, starting from next Nagreg Padalarang east to west. Horizontal distance of the basin about 60 kilometers. The north-south distance of about 40 kilometers. Basin was becoming obvious when it is associated with the confinement of the surrounding mountains.

Geologists from the Geological Survey Center, Sutikno Bronto and Udi Hartono, in writing, Potential for Geological Resources in Bandung Basin and Surrounding Areas (2006), mentions, Bandung Basin is surrounded by a line of old volcanic cones quarter. Only the western part of the Bandung Basin is limited to tertiary-old rock and limestone.

Previous research suggests deposition in the Bandung Basin began 126 000 years ago, a volcanic rock and lake sediment. Among the ancient land and the Bandung Basin sedimentary rock bottom, there are many layers of volcanic ash as a marker of volcanic activity that started the formation of Lake Bandung. The flow of river water are unstoppable Citarum hurl rocks from Mount Sunda mentioned come to fill the huge basin.

Geologists from the Research Center for Geotechnology Indonesian Institute of Sciences, Eko Yulianto, say, the lake city of Bandung was soaking through several stages and finally formed about 20,000 years ago.

That said, the disappearance of the lake caused the leak. However, some argue that due to siltation due to the material is brought to the lake and sediment.

According to Eko Yulianto, the ancient lake sediments also causes soft landed Bandung Basin area.

Sutikno Bronto and Udi Hartono suspect Bandung Basin as a system of multiple volcanic caldera. There is a pattern resembling an arc ranging from Jatiluhur Cianjur-northwest, Subang in the north and northeast, and Mount Tampomas-Majalengka in the northeast. Pattern is known as fault lineaments Bandung Raya formed from the combination Fault Cimandiri, Falkirk, Subang, and Baribis. In the south the fault system there are other faults such as Padalarang, Lembang, Tampomas, and Brass-Cilacap.

Convex pattern suggests a style that comes from one place and then spread. One hunch is that the existence of the vertical force under the Bandung Basin and surrounding areas. Perpendicular style was probably derived from the bedrock that may form a small continent in the Bandung. Other estimates are the magma freezes or actually trying to build power. (Writing Team Ring of Fire Expedition)

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