Journal of Tropical Oceanography ›› 2017, Vol. 36 ›› Issue (6): 51-61.doi: 10.11978/2017044CSTR: 32234.14.2017044
• 海洋地球物理学 • Previous Articles Next Articles
Comparison of crustal structure between the Southwest Sub-basin, South China Sea and the ultraslow-spreading Southwest Indian Ridge
Junhui YU1,2(
), Pin YAN1(), Jian LIN1,3
- 1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
-
Received:2017-04-13Revised:2017-06-02Online:2017-11-30Published:2018-01-18 -
About author:Author:QIU Chunhua.E-mail:
qiuchh3@mail. sysu.edu.cn -
Supported by:National Natural Science Foundation of China (91328205, 41376062, 91628301, U1606401);Security Project of Marine Geology of Ministry of Land and Resources (GZH20110205);Chinese Academy of Sciences Project (QYZDY-SSW-DQC005, Y4SL021001)
CLC Number:
- P738
Cite this article
Junhui YU, Pin YAN, Jian LIN. Comparison of crustal structure between the Southwest Sub-basin, South China Sea and the ultraslow-spreading Southwest Indian Ridge[J].Journal of Tropical Oceanography, 2017, 36(6): 51-61.
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Fig. 1
Along-axis bathymetry and MBA map (a) and bathymetry map (b) of the SWIR. The black lines indicate the ridge axis (panel b). The bathymetry chart is mapped by GMT software (Wessel et al, 1998) with the data from National Oceanic and Atmospheric Administration (NOAA). The along-axis bathymetry and MBA data are from Georgen et al, 2001. BTJ: Bouvet Triple Junction; RTJ: Rodrigues Triple Junction; MAR: Mid-Atlantic Ridge; SWIR: Southwest Indian Ridge; CIR: Central Indian Ridge; SEIR: Southeast Indian Ridge; AAR: America-Antarctica Ridge; AB: Andrew Bain Transform Fault; PE: Prince Edward Transform Fault; D#cod#x02161;: Discovery #cod#x02161; Transform Fault; IN: Indomed Transform Fault; GA: Gallieni Transform Fault; A#cod#x02161;: Atlantis #cod#x02161; Transform Fault; ME: Melville Transform Fault"
Fig. 1
"
Fig. 3
Multibeam bathymetry (a), schematic representation of the axial valley (b) and MBA (c) maps of the SWIR from 54#cod#x000b0;06'E to 57#cod#x000b0;E (modified after Sauter et al, 2001). (a) The white lines indicate the ridge axis. (b) The grey area marks the inner-valley. Vertical black lines mark the location of the central magnetic anomaly. Thick black lines and diamonds show segments and segment centers, respectively. (c) The white lines indicate the ridge axis"
Fig. 3
Fig. 4
Multibeam bathymetry (a), MBA (b) and magnetization (c) maps of the SWIR from 9#cod#x000b0;E to 16#cod#x000b0;E (modified after Dick et al, 2003). (a) Small circles indicate dredge locations. Gravity and magnetic data are derived from the shipboard measurements data. (c) The contour interval is 4 A#cod#x000b7;m-1 in magnetization map"
Fig. 4
Fig. 5
Seismic velocity models for profile CAM114 (a), CAM116 (b), CAM120 (c) in 66#cod#x000b0;E SWIR (modified after Minshull et al, 2006). The velocity contour interval is 0.4km#cod#x000b7;s-1. The dashed lines just below the 6.4km#cod#x000b7;s-1 contour mark the base of Layer 2. A, B, C, D indicates the spreading segments. VE: Vertical Exaggeration"
Fig. 5
Fig. 6
Two alternative velocity models for north-south seismic Line CAM101 over Atlantis Bank (modified after Muller et al, 2000 and Dick et al, 2016). Upper panel shows a model of undifferentiated Layer 3; lower panel shows an alternative model of a lower serpentinized mantle Layer 3 and an upper gabbroic Layer 3. These models can both fit the seismic data. Hole 735B is projected from ~1km to the west. Green line: depth of Hole U1473A drilled during IODP Expedition 360, orange and red lines: projected penetration during the remainder of the SloMo project"
Fig. 6
Fig. 7
Three-dimensional view of the axial valley and interpretative cross-section in 64#cod#x000b0;30'E SWIR (modified after Sauter et al, 2013). Models showing that small patches of lavas (#cod#x003b1;) might have been erupted directly onto this earlier detachment fault surface; another patch (#cod#x003b2;) is interpreted to have rafted on the new detachment fault surface"
Fig. 7
Fig. 8
Location of the Southwest Sub-basin and the NH973-1 seismic survey line. Solid red line indicates the location of profile showed in Fig.9. The bathymetry chart is mapped by GMT software (Wessel et al, 1998) with the data from NOAA"
Fig. 8
Fig. 9
The seismic profile (a) and its interpretation (b) of the northwestern segment (see Fig.8 for location) of line NH973-1 in the Southwest Sub-basin, South China Sea"
Fig. 9
Fig. 10
Comparison of morphologic profiles of the Southwest Sub-basin, South China Sea (a), the Southwest Indian Ridge at 15#cod#x000b0;30'E (b)"
Fig. 10
Fig. 11
Seismic crustal thickness versus full spreading rate (modified after Dick et al, 2003). The grey shaded area indicates the range of crustal thickness and full spreading rate in the Southwest Sub-basin, South China Sea"
Fig. 11
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