Wan, Shiming; Li, Anchun; Clift, Peter D; Jiang, Hengyi (2006): Sedimentology and accumulation rates of ODP Site 184-1143 in the South China Sea (Appendix B) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.693923, Supplement to: Wan, S et al. (2006): Development of the East Asian summer monsoon: Evidence from the sediment record in the South China Sea since 8.5 Ma. Palaeogeography, Palaeoclimatology, Palaeoecology, 241(1), 139-159, https://doi.org/10.1016/j.palaeo.2006.06.013
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Abstract:
128 samples from Ocean Drilling Program (ODP) Site 1143 in the southern South China Sea were analyzed for grain size, clay minerals, biogenic opal content and quartz in order to reconstruct changes in East Asian monsoon climate since 8.5 Ma. An abrupt change of terrigenous mass accumulation rate (MAR), clay mineral assemblage, median grain size and biogenic opal MAR about 5.2 Ma suggests that between 8.5-5.2 Ma the source of terrigenous sediment was mainly in the region of surface uplift and basaltic volcanism in southern Vietnam. A simple model of East Asian summer monsoon evolution was based on the clay/feldspar ratio, kaolinite/chlorite ratio and biogenic opal MAR. The summer monsoon has two periods of maximum strength at 8.5-7.6 Ma and 7.1-6.2 Ma. Subsequently, there was a relatively stable period at 6.2-3.5 Ma, continued intensification about 3.5-2.5 Ma, and gradually weakening after 2.5 Ma. Since 1 Ma the monsoon has intensified, with remarkable high-frequency and amplitude variability. Simultaneous increase in sedimentation rates at ODP Sites 1143, 1146 and 1148, as well as in MAR of terrigenous materials, quartz, feldspar and clay minerals at ODP Site 1143 at 3.5-2.5 Ma, may be the erosional response to both global climatic deterioration and the strengthening of the East Asian summer monsoon after about 3-4 Ma.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 9.361933 * Longitude: 113.285133
Date/Time Start: 1999-03-03T00:00:00 * Date/Time End: 1999-03-10T00:00:00
Minimum DEPTH, sediment/rock: 0.77 m * Maximum DEPTH, sediment/rock: 414.15 m
Event(s):
184-1143 * Latitude: 9.361933 * Longitude: 113.285133 * Date/Time Start: 1999-03-03T00:00:00 * Date/Time End: 1999-03-10T00:00:00 * Elevation: -2772.3 m * Penetration: 1158.2 m * Recovery: 1101.8 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 126 cores; 1158.2 m cored; 0 m drilled; 95.1% recovery
Comment:
Age model after Tian et al. 2002, doi:10.1016/S0012-821X(02)00923-8 and Li et al. 2004, doi:10.1029/2003PA000906
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2276 data points
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