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Registros recuperados: 7
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Geodynamics of the South China Sea ArchiMer
Sibuet, Jean-claude; Yeh, Yi-ching; Lee, Chao-shing.
The beginning of seafloor spreading in the South China Sea (SCS) is now established from IODP drilling Leg 349 at 33 Ma. Chron 12 (32 Ma) is the oldest chron identified in the SCS. The nature of the crust of the northeastern part of the SCS located north of chron C12, where chrons 15 to 17 were previously identified, is not oceanic but thinned continental crust intruded by volcanic elongated features emplaced 17-22 Ma ago. Based on magnetic anomalies identifications, the end of the SCS spreading could be either 15.5, 20.5 Ma (Briais et al., 1993; Barckhausen et al., 2014) or something else. However, as post-spreading magmatic activity (~ 13-3.5 Ma) largely masks the spreading fabric in particular near the axis of the east sub-basin, published locations of...
Tipo: Text Palavras-chave: South China Sea; Gravity; Magnetics; Structural and tectonic analyses; Kinematics.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00316/42686/42059.pdf
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Indentation of the Philippine Sea plate by the Eurasia plate in Taiwan: Details from recent marine seismological experiments ArchiMer
Lallemand, Serge; Theunissen, Thomas; Schnurle, Philippe; Lee, Chao-shing; Liu, Char-shine; Font, Yvonne.
We analyze in this study a new set of marine data including 3D local tomography, 1992-2008 relocated earthquakes and two recent multichannel seismic lines to characterize the deformation style in the collision area offshore east Taiwan. We have mapped in detail the Mohos of the converging plates as well as the subduction interface with a resolution never reached before. We show that the sharp continental subduction of the Eurasia plate, beneath the middle part of the Central Range, indents the Philippine Sea plate (PSP) as attested by intra-oceanic slicing and incipient subduction of the PSP beneath the east coast of Taiwan. The westernmost part of the PSP slab is probably experiencing a beginning of break-off as attested by NW-trending en-echelon shear...
Tipo: Text Palavras-chave: Arc-continent collision Local tomography Tear; Subduction Intra-oceanic slicing Slab break-off.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00149/26048/24164.pdf
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Origin of the southern Okinawa Trough volcanism from detailed seismic tomography - art. no. B08308 ArchiMer
Lin, Jing-yi; Sibuet, Jean-claude; Lee, Chao-shing; Hsu, Shu-kun; Klingelhoefer, Frauke.
Magmatism associated with subducting plate edges or slab tears has been suggested in the southern Okinawa Trough. The cross back-arc volcanic trail, which consists of a cluster of about 70 seamounts, is located above a Ryukyu slab tear lying along the 123.3°E meridian. In November 2003, more than 3300 earthquakes recorded in this area by 15 ocean bottom seismometers and surrounding land stations during a period of 12 days were used to determine the three-dimensional Vp and Vs velocity structures and Vp/Vs ratios. A mantle inflow characterized by low Vp and Vs and high Vp/Vs passing through the slab tear is imaged. The fluid and/or melt component is rising obliquely from the slab tear in the directions of the cross back-arc volcanic trail, the northern...
Tipo: Text Palavras-chave: Slab component volcanism; Vp/Vs tomography; Southern Okinawa Trough back arc basin.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3032.pdf
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Reply to the comment of Talwani et al. (2017) on the Sibuet et al. (2016) paper entitled “Thinned continental crust intruded by volcanics beneath the northern Bay of Bengal” ArchiMer
Sibuet, Jean-claude; Klingelhoefer, Frauke; Yeh, Yi-ching; Rangin, Claude; Lee, Chao-shing.
The northern Bay of Bengal velocity-depth profiles do not follow the velocity-depth curve of the North Atlantic volcanic margins, and only partially the Kerguelen velocity-depth curves. Deep seismic refraction and reflection profiles acquired across the Hatton bank and Feroes ridge show that the melt is intruded into the lower thinned continental crust as sills, which cross-cut the continental fabric rather than underplating as it was often assumed in the past. Compared with the SCS northern margin proxy, we still suggest that the BoB crust is thinned continental crust intruded by post-rifting volcanics, as also shown by the interpretation of the numerous high-quality deep MCS profiles we collected there. What was supposed to be underplating might be sills...
Tipo: Text Palavras-chave: Northern Bay of Bengal; Wide-angle and reflection seismic profiles; Multichannel seismic profiles; Thinned continental crust intruded by; Volcanics.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00393/50459/51192.pdf
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Spatial variations in the frequency-magnitude distribution of earthquakes in the southwestern Okinawa Trough ArchiMer
Lin, Jing-yi; Sibuet, Jean-claude; Lee, Chao-shing; Hsu, Shu-kun; Klingelhoefer, Frauke.
The relations between the frequency of occurrence and the magnitude of earthquakes are established in the southern Okinawa Trough for 2823 relocated earthquakes recorded during a passive ocean bottom seismometer experiment. Three high b-values areas are identified: (1) for an area offshore of the Ilan Plain, south of the andesitic Kueishantao Island from a depth of 50 km to the surface, thereby confirming the subduction component of the island andesites; (2) for a body lying along the 123.3 degrees E meridian at depths ranging from 0 to 50 km that may reflect the high temperature inflow rising up from a slab tear; (3) for a third cylindrical body about 15 km in diameter beneath the Cross Backarc Volcanic Trail, at depths ranging from 0 to 15 km. This...
Tipo: Text Palavras-chave: Magma chamber; Slab tear; Southern Okinawa Trough backarc basin; B Values.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3036.pdf
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Structure of the southernmost Okinawa Trough from reflection and wide-angle seismic data ArchiMer
Klingelhoefer, Frauke; Lee, Chao-shing; Lin, Jing-yi; Sibuet, Jean-claude.
During a passive seismic experiment in the Okinawa Trough the shots of two reflection profiles were recorded by ocean bottom seismometers (OBS). Both profiles include 3 ocean-bottom instruments, are about 65 km in length and located in the axial portion of the southwestern Okinawa Trough. Processing of the reflection seismic data images recent deformation of the sedimentary units. Forward modelling of the wide-angle data on both profiles reveals a 1-2 km thick sedimentary infill overlying an acoustic basement characterised by seismic velocities between 3.2 and 3.5 km/s. Crustal thickness could only be modelled on one profile and was determined to be around 10 km, thickening towards the Ryukyu Arc in the south. Gravity modelling was used to additionally...
Tipo: Text Palavras-chave: Back arc basin; Crustal structure; Wide angle seismics; Okinawa Trough.
Ano: 2009 URL: https://archimer.ifremer.fr/doc/2009/publication-6414.pdf
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Thinned continental crust intruded by volcanics beneath the northern Bay of Bengal ArchiMer
Sibuet, Jean-claude; Klingelhoefer, Frauke; Huang, Yuan-ping; Yeh, Yi-ching; Rangin, Claude; Lee, Chao-shing; Hsu, Shu-kun.
Since the early Cretaceous, the Bay of Bengal was formed during rifting between India and Antarctica and then by subsequent seafloor spreading. The nature of the crust underlying the Bay of Bengal is oceanic south of 15°N, but remains unknown (thinned continental crust, serpentinized mantle or oceanic crust) north of this limit. In order to better define the nature of the crust in the northern Bay of Bengal, three wide-angle reflection seismic and refraction profiles were acquired during the multichannel seismic reflection Bengal cruise. Nine ocean-bottom seismometers were deployed alternatively on three profiles. A seismic source consisting of 64 air guns with a volume of 6180 in3 was used simultaneously with a 10.05-km long streamer to acquire both...
Tipo: Text Palavras-chave: Northern Bay of Bengal; Wide-angle seismic reflection and refraction data; Thinned continental crust intruded by volcanics.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00345/45571/45180.pdf
Registros recuperados: 7
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