Banda Arc Tectonics: The Significance of the Sumba Island (Indonesia)
F. H. Chamalaun, A. E. Grady, C. C. von der Borch, H. M. S. Hartono, 1982. "Banda Arc Tectonics: The Significance of the Sumba Island (Indonesia)", Studies in Continental Margin Geology, J. S. Watkins, C. L. Drake
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Current geological and geophysical knowledge of the Sumba (Indonesia) Island is reviewed with consideration of recent fieldwork. Sumba does not exhibit features of the subduction tectonics of the Sunda Arc system (to the west of Sumba), nor the collision tectonics of the Banda Arc system to the east. It is supposed that Sumba is a continental fragment from Australia to the south or from Sundaland to the north, that became trapped behind the eastern Java Trench. The data does not provide convincing support for either hypothesis, but appears to favor an Australian origin. We propose critical studies that aid in resolving the origin of Sumba.
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Studies in Continental Margin Geology
"Studies in Continental Margin Geology" contains papers from a research conference co-sponsored by AAPG and the University of Texas Institute for Geophysics held in Galveston, Texas in 1981. Rapid advances in the understanding of continental margin geology were taking place during the time period, based on major improvements in the quality and availability of regional seismic surveys plus other fields such as organic geochemistry. For the first time it was becoming common to have a visual characterization of tectonic processes at significant depths below the surface. Twenty-seven papers are presented that deal with field investigations of continental margin structure and stratigraphy. The geographic areas of study are global in nature and many of the descriptive results are derived from modern seismic investigations in areas where that type of data had not previously been available in commercial publications. Fifteen of the papers focus on rifted margins and the other twelve concern convergent margins. Twelve papers are model investigations of a variety of margin environmental processes, related to subjects such as depositional environments, biostratigraphy, organic matter deposition, and oil and gas occurrences as a function of the plate tectonic setting. An additional nine papers model the thermal and mechanical tectonic processes involved in the structural development along continental margins.