Journal of Tropical Oceanography ›› 2019, Vol. 38 ›› Issue (4): 70-80.doi: 10.11978/2018110CSTR: 32234.14.2018110
• Marine Geology • Previous Articles Next Articles
Variations in tectonic faulting and magmatism at the Southeast Indian Ridge at 108°-134°E
Shoujin LIU1,3,Jian LIN1,2(
),Yiming LUO1,3
- 1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
-
Received:2018-10-19Revised:2018-11-16Online:2019-07-20Published:2019-07-21 -
Supported by:Chinese Academy of Sciences Project((Y4SL021001););Chinese Academy of Sciences Project((YZ201325、YZ201534););China Ocean Mineral Resources R&D Association((DY135-S2-1-04););National Key Research and Development Program of China((2018YFC0309800););National Natural Science Foundation of China((91628301, U1606401, 41706056).)
Cite this article
Shoujin LIU,Jian LIN,Yiming LUO. Variations in tectonic faulting and magmatism at the Southeast Indian Ridge at 108°-134°E[J].Journal of Tropical Oceanography, 2019, 38(4): 70-80.
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Fig. 1
Topography and tectonic map of the study area. Black dots indicate the ridge axis. Yellow stars denote the locations of OCCs. Transform faults, fracture zones, and none-transform discontinuities are visible in the bathymetry map. White lines and frames define the ridge segments and regions with multi-beam bathymetry data. Red dots and yellow short lines show the locations of profiles for M factor calculations"
Fig. 1
Fig. 2
Maps of FAA (a), sediment thickness (b), and crustal age (c) in our study area. Black solid lines mark the SEIR axis"
Fig. 2
Fig. 3
Cartoons for M factor calculations. Profiles perpendicular to normal mid-oceanic ridge: (a) without OCC; and (b) an OCC is located on the ridge flank. Vertical grey rectangles indicate the regions with magma intrusion. Arrows denote motion directions of fault blocks. Modified from Smith (2013). The M factor is given by $M=\frac{\sum{{{X}_{\text{m}}}}}{\sum{{{X}_{\text{m}}}-\sum{{{X}_{\text{f}}}}}}$"
Fig. 3
Fig. 4
Water depth (top figure in each subpanel) and topographic slope (bottom figure) maps of ridge segments in our study area．Black arrows indicate the location and strike of the ridge axis. Black circles indicate regions with high slopes caused by OCCs. Red arrows indicate the OCCs．White lines denote locations of profiles"
Fig. 4
Fig. 5
Profiles of water depth and slope of each segment. Locations of the profiles and water depth (top), faults locations (middle), and calculated slopes (bottom). Black arrows and short black lines denote the locations and extents of faults, respectively"
Fig. 5
Fig. 6
Slope frequency of each segment in the study area．Each segment was divided into 1000 parts. Black dots represent the slope frequency of the ridge segments. Black curves indicate the fitting results of three-parameter distribution. Areas with slope over 10° are shaded in light grey"
Fig. 6
Fig. 7
(a) RMBA in our study area. White curve lines outline the regions of OCCs. (b) Correlation between M factor and RMBA. Vertical and horizontal error bars show extremums of M factor and RMBA, respectively. (c) Correlation between RMBA and water depth. Red and blue dots denote average water depth versus average RMBA in 0.1°×0.1° grid of the whole study area and the OCC regions, respectively. Vertical and horizontal error bars represent extremums of RMBA and water depth of the OCC regions, respectively"
Fig. 7
Fig. 8
Profiles of (a) water depth, (b) RMBA, (c) Na8.0, (d) Fe8.0, and (e) map view M factor along the ridge axis in the study area. Black arrows indicate locations of the transform fault and the none-transform discontinuity. Gray dashed lines show trends of Na8.0 and Fe8.0 values. Ridge segments with OCCs are shaded in pink"
Fig. 8
Fig. 9
Magmatic progress map of the study area. The triangles represent partial melting zones in the upper mantle. Red bold line on the crust surface represents the ridge axis. The black bold arrows represent the seafloor spreading directions"
Fig. 9
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