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| 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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| 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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| 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 |
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