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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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| 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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