Review of Early Results from Drilling of the IPOD-1 Active Margin Transects Across the Japan, Mariana, and Middle-America Convergent Margins
Roland von Huene, 1981. "Review of Early Results from Drilling of the IPOD-1 Active Margin Transects Across the Japan, Mariana, and Middle-America Convergent Margins", The Deep Sea Drilling Project: A Decade of Progress, John E. Warme, Robert G. Douglas, Edward L. Winterer
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IPOD transects across convergent margins have provided time stratigraphic and environmental information to support the general concepts of spreading during the opening of backarc basins and tectonic accretion at the front of the underthrust plate. Three convergent margins are without large accretionary complexes, and other less frequently applied concepts are necessary to interpret them. Much sediment is subducted beneath the four margins investigated; along all of the margins there are periods when the continental framework was truncated and somehow removed by tectonic erosion. Vertical motions have been recorded during active arc magmatism (and, by implication, subduction) including not only uplift but also equally rapid subsidence. Off Japan the seaward part of the margin subsided from above sea level to 6 km depth. The scope of tectonic processes along convergent margins is much greater than was anticipated when the program was first planned.
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At the present the Glomar Challenger has drilled over 500 holes over the world ocean, involving hundreds of scientists from dozens of countries. This volume is intended as a review of some of theimportant results from the most comprehensive, ambitious and successful earth-bound geologic project ever undertaken. The symposium upon which this volume originated was held April 4, 1979 at the SEPM/AAPG Annual Meeting in Houston. No comprehensive synthesis of all aspects of the DSDP has appeared, and the topic coverage in this volume is biased towards the sediments and fossils, and their significance for certain aspects of earth history – paleogeography, bathymetry, climatology, oceanography, ecology, environments – all in keeping with the audience of sedimentary geologists.