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| Collot, Julien; Lewis, Keith; Lamarche, Geoffroy; Lallemand, Serge. |
| Despite convergent margins being unstable systems, most reports of huge submarine slope failure have come from oceanic volcanoes and passive margins. Swath bathymetry and seismic profiles of the northern Hikurangi subduction system, New Zealand, show a tapering 65–30 km wide by 65 km deep margin indentation, with a giant, 3150±630 km3, blocky, debris avalanche deposit projecting 40 km out across horizontal trench fill, and a debris flow deposit projecting over 100 km. Slide blocks are well‐bedded, up to 18 km across and 1.2 km high, the largest being at the avalanche deposit's leading edge. Samples dredged from them are mainly Miocene shelf calc‐mudstones similar to those outcropping around the indentation. Cores from cover beds suggest that failure... |
| Tipo: Text |
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| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/00683/79509/82127.pdf |
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| Huang, Yin-sheng; Hsu, Shu-kun; Su, Chih-chieh; Lin, Andrew Tien-shun; Yu, Pai-sen; Babonneau, Nathalie; Ratzov, Gueorgui; Lallemand, Serge; Huang, Pi-chuen; Lin, Shiao-shan; Lin, Jing-yi; Wei, Kuo-yen; Chang, Yuan-pin; Yu, Neng-ti; Tsai, Ching-hui. |
| We have collected two shallow gas hydrate samples at two sites having different geological settings off southwest Taiwan during the cruise MD214 in 2018. The first core site, MD18-3542, is on the South Yuan-An East Ridge at ~ 1200 m water deep, where a structural unconformity covered by fine-silt sediments appears at ~ 5.5 m below the seafloor. The second core site, MD18-3543, is close to the Good-Weather Ridge at ~ 1100 m water deep, where a gas-related pockmark structure and authigenic carbonates are present at shallow strata with fine-silt sediments near the seafloor. Sediment properties of core MD18-3542 are distinctively different above and below the layer corresponding to the unconformity. Both cores show obvious gaps or voids in the lower core... |
| Tipo: Text |
Palavras-chave: MD core; Shallow gas hydrate; Hydrate dissociation; Off SW Taiwan. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00680/79253/81769.pdf |
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| Hsieh, Yu‐huan; Liu, Char‐shine; Suppe, John; Byrne, Timothy B.; Lallemand, Serge. |
| The Chimei Canyon is a large, uplifting wedge‐top submarine canyon offshore eastern Taiwan that has delivered sediment since ~1‐2 Ma from the rapidly eroding Taiwan orogen to the Chimei Fan in the Huatung Basin, east of the colliding Luzon Arc. In this study, we document the depositional record of the Taiwan arc‐continent collision on the adjacent oceanic Philippine Sea plate using multichannel seismic reflection data together with high‐resolution bathymetry data to study the morphology, seismic sequences, and structures of the Chimei Canyon‐Fan system. The sedimentary strata are separated into three seismic sequences. The lowest sequence overlies oceanic crust, showing Cenozoic‐Cretaceous pelagic seismic facies that we interpret as pre‐collisional,... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00654/76585/77731.pdf |
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| Hsu, Shu-kun; Liu, Char-shine; Shyu, Chuen-tien; Liu, Shao-yung; Sibuet, Jean-claude; Lallemand, Serge; Wang, Chensung; Reed, Donald. |
| We have compiled new free-air gravity anomaly (FAA) and magnetic anomaly maps, shedding light on the tectonics in the Taiwan-Luzon region. To have a suitable datum level for both the available gravity and magnetic anomaly data, the set of data from an ACT cruise, conducted during May 27 to June 21, 1996, was chosen as a reference. Based on the cross-over error analysis, all the other data were adjusted accordingly. Some satellite-derived, airborne or land data were also added to the compilation to obtain better coverage. Several major new insights into the Taiwan-Luzon region are revealed by the new maps. (1) A prominent NE-SW trending belt of gravity and magnetic anomalies is present in the onshore and offshore areas of southwestern Taiwan. The Peikang... |
| Tipo: Text |
Palavras-chave: Free-air gravity anomaly; Bouguer anomaly; Magnetic anomaly; Transverse ridge; Fracture zone; Transform fault; Taiwan. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00447/55859/58057.pdf |
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| Philippon, Mélody; Cornée, Jean-jacques; Münch, Philippe; Van Hinsbergen, Douwe J. J.; Boudagher-fadel, Marcelle; Gailler, Lydie; Boschman, Lydian M.; Quillevere, Fredéric; Montheil, Leny; Gay, Aurelien; Lebrun, Jean Fredéric; Lallemand, Serge; Marivaux, Laurent; Antoine, Pierre-olivier; With The Garanti Team,. |
| Intriguing latest Eocene land-faunal dispersals between South America and the Greater Antilles (northern Caribbean) has inspired the hypothesis of the GAARlandia (Greater Antilles Aves Ridge) land bridge. This landbridge, however, should have crossed the Caribbean oceanic plate, and the geological evolution of its rise and demise, or its geodynamic forcing, remain unknown. Here we present the results of a land-sea survey from the northeast Caribbean plate, combined with chronostratigraphic data, revealing a regional episode of mid to late Eocene, trench-normal, E-W shortening and crustal thickening by ∼25%. This shortening led to a regional late Eocene–early Oligocene hiatus in the sedimentary record revealing the location of an emerged land (the Greater... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00656/76789/77953.pdf |
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