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| Geli, Louis; Cochran, James R.; Lee, T. C.; Francheteau, J.; Labails, C.; Fouchet, C.; Christie, D.. |
| The flanks of the Southeast Indian Ridge are characterized by anomalously low subsidence rates for the 0-25 Ma period: less than 300 m Ma(-1/2) between 101 degrees E and 120 degrees E and less than 260 m Ma(-1/2) within the Australian-Antarctic Discordance (AAD), between 120 degrees E and 128 degrees E. The expected along-axis variation in mantle temperature (similar to 50 degrees C) is too small to explain this observation, even when the temperature dependence of the mantle physical properties is accounted for. We successively analyze the effect on subsidence of different factors, such as variations in crustal thickness; the dynamic contribution of an old, detached slab supposedly present within the mantle below the AAD; and depletion in phi(m), a... |
| Tipo: Text |
Palavras-chave: Southeast Indian Ridge; Seafloor subsidence; Mantle temperature. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00068/17898/15449.pdf |
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| Cochran, James R.. |
| The Andaman Sea has developed as the result of highly oblique subduction at the western Sunda Trench, leading to partitioning of convergence into trench-perpendicular and trench-parallel components and the formation of a northward-moving sliver plate to accommodate the trench parallel motion. The Andaman forearc contains structures resulting from both components of motion. The main elements of the forearc are the accretionary prism and outerarc ridge, a series of forearc basins and major N-S faults. The accretionary prism is an imbricate stack of fault slices and folds consisting of ophiolites and sediments scrapped off the subducting Indian Plate. The western, outer slope of the accretionary prism is very steep, rising to depths of 1500-2000 m within a... |
| Tipo: Text |
Palavras-chave: Seismicity and tectonics; Subduction zone processes; Continental tectonics; Strike-slip and transform; Indian Ocean. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00231/34191/32773.pdf |
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