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Satyana, Awang H.
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Earth & Planetary Sciences

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Bali–Lombok Gap: A Distinct Geo-Biologic Border of the Wallace Line Satyana, Awang H.
Berita Sedimentologi Vol 25, No 1 (2012)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (763.191 KB) | DOI: 10.51835/bsed.2012.25.1.169

Abstract

The "Wallace Line", a line that divides faunal distribution, came into being in 1863 and was named after Alfred Russell Wallace, the great English naturalist travelling the "Malay archipelago‟ or the Indonesian islands from 1854-1862. The Wallace Line separates the Oriental (Asian) fauna to the west from the Australasian fauna to the east. The original Wallace Line ran between Bali and Lombok, extending northward between Borneo/Kalimantan and Sulawesi, and between the Philippines and Indonesia. The Asian animal community includes such mammals as rhinoceroses, orang-utans, tapirs, tigers, and elephants. Animals related to Australian fauna include birds such as cockatoos, birds of paradise, marsupials and cuscuses.
New Look at the Origin of the Sumba Terrane: Multidisiplinary Approaches Satyana, Awang H.; Purwaningsih, Margaretha E. M.
Berita Sedimentologi Vol 25, No 1 (2012)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1947.713 KB) | DOI: 10.51835/bsed.2012.25.1.172

Abstract

Sumba Island belongs to the Lesser Sunda Islands Group. Geologically, the island is located in a forearc setting in front of the Quaternary Sunda-Banda volcanic arcs, which comprise the islands of Bali-Lombok-Sumbawa-Flores-Alor and Wetar. Sumba Island is presently non-volcanic and is tectonically important since it is located at the border of subduction and collision zones. To the west of Sumba, oceanic crust of the Indian Ocean is being subducted beneath the Sunda Arc. To the east of Sumba, there is collision zone where Australian continental crust underthrusts Timor Island.Based on tectonic studies, Sumba has been considered as a micro-continent or continental fragment/ sliver which detached itself from its provenance and was transported to its present position as an exotic terrane. Gravity data show that Sumba has a gravity anomaly of +160 to +200 mgal and is underlain by continental crust with a thickness of 24 km.The pre-Tertiary basement of Sumba reveals faulting with rifted blocks. Overlying this are Late Cretaceous-Paleocene marine turbidites of the Lasipu Formation. This period is accompanied by two major calc-alkaline magmatic episodes, the Santonian-Campanian episode (86-77 Ma) and the Maastrichtian-Thanetian one (71-56 Ma). Overlying these are volcaniclastic and neritic sediments accompanied by volcanic rocks belonging to theLutetian-Rupelian Paumbapa Formation (42-31 Ma). The Neogene rocks are composed of widespread transgressive and turbiditic chalky sediments of the Kananggar/Sumba Formation, which contain reworked volcanic materials. Synsedimentary tectonism with normal faulting and largescale slumping occurred during the Neogene. The Quaternary rocks are coral reefs, uplifted to form terraces.
Co-Authors Purwaningsih, Margaretha E. M.