Sedimentology and accumulation rates of ODP Site 184-1143 in the South China Sea (Appendix B)
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PANGAEA
2006
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| _version_ | 1867168068547903488 |
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| author | Wan, Shiming Li, Anchun Clift, Peter D Jiang, Hengyi |
| author_facet | Wan, Shiming Li, Anchun Clift, Peter D Jiang, Hengyi |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_693923 |
| institution | PANGAEA |
| language | en |
| publishDate | 2006 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sedimentology and accumulation rates of ODP Site 184-1143 in the South China Sea (Appendix B) Wan, Shiming Li, Anchun Clift, Peter D Jiang, Hengyi 184-1143; Accumulation rate, clay < 2 µm; Accumulation rate, feldspar; Accumulation rate, mass; Accumulation rate, opal; Accumulation rate, quartz; Accumulation rate, terrigenous; AGE; Calculated; Chlorite; COMPCORE; Composite Core; Density, dry bulk; DEPTH, sediment/rock; Feldspar; Illite; Joides Resolution; Kaolinite; Leg184; Median, grain size; Ocean Drilling Program; ODP; Opal, biogenic silica; Opal extraction according to Mortlock & Froelich, 1989; Quartz; Sedimentation rate; Size fraction < 0.002 mm, clay; Smectite; South China Sea; Terrigenous 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. |
| title | Sedimentology and accumulation rates of ODP Site 184-1143 in the South China Sea (Appendix B) |
| topic | 184-1143; Accumulation rate, clay < 2 µm; Accumulation rate, feldspar; Accumulation rate, mass; Accumulation rate, opal; Accumulation rate, quartz; Accumulation rate, terrigenous; AGE; Calculated; Chlorite; COMPCORE; Composite Core; Density, dry bulk; DEPTH, sediment/rock; Feldspar; Illite; Joides Resolution; Kaolinite; Leg184; Median, grain size; Ocean Drilling Program; ODP; Opal, biogenic silica; Opal extraction according to Mortlock & Froelich, 1989; Quartz; Sedimentation rate; Size fraction < 0.002 mm, clay; Smectite; South China Sea; Terrigenous |
| url | https://doi.org/10.1594/PANGAEA.693923 |