Wei, Gangjian; Li, Xian-hua; Liu, Ying; Shao, Lei; Liang, Xirong (2006): (Table 1) Element concentrations in detrital sediments of ODP Site 184-1148 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.833703, Supplement to: Wei, G et al. (2006): Geochemical record of chemical weathering and monsoon climate change since the early Miocene in the South China Sea. Paleoceanography, 21(4), PA4214, https://doi.org/10.1029/2006PA001300
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
The chemical index of alteration (CIA) and elemental ratios that are sensitive to chemical weathering, such as Ca/Ti, Na/Ti, Al/Ti, Al/Na, Al/K, and La/Sm, were analyzed for detrital sediments at Ocean Drilling Program Site 1148 from the northern South China Sea to reveal information of chemical weathering in the source regions during the early Miocene. High CIA values of ~80, coupled with high Al/Ti and Al/Na and low Na/Ti and Ca/Ti, are observed for the sediments at ~23 Ma, indicating a high chemical weathering intensity in the north source region, i.e., south China. This was followed by gradual decreases in Al/Ti, Al/Na, La/Sm, and Al/K ratios, as well as the CIA values, and increases in Ca/Ti and Na/Ti ratios. These records together with other paleoclimate proxies, such as black carbon d13C and benthic foraminifer d18O, give reliable information on the climate changes in south China. Our results show that the climate in south China was warm and humid in the early Miocene (~23 Ma) according to the chemical weathering records. The humidity in south China decreased from the early Miocene to Present with several fluctuations centering at approximately 15.7 Ma, 8.4 Ma, and 2.5 Ma, coincident with the global cooling since the middle Miocene. These climate changes implied that the summer east Asian monsoon has dramatically affected south China in the early Miocene, whereas the influence of the summer monsoon on this region has decreased continuously since that time, probably because of the intensification of the winter monsoon. Such an evolution for the east Asian monsoon is different from that for the Indian monsoon.
Further details:
Li, Xian-hua; Wei, Gangjian; Shao, Lei; Liu, Ying; Liang, Xirong; Jian, Zhimin; Sun, Min; Wang, Pinxian (2003): Geochemical and Nd isotopic variations in sediments of the South China Sea: a response to Cenozoic tectonism in SE Asia. Earth and Planetary Science Letters, 211(3-4), 207-220, https://doi.org/10.1016/S0012-821X(03)00229-2
ODP/TAMU (2005): JANUS Database. Ocean Drilling Program, Texas A&M University, College Station TX 77845-9547, USA; (data copied from Janus 2005-02 to 2005-06), http://www-odp.tamu.edu/database/
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 18.836150 * Longitude: 116.565650
Date/Time Start: 1999-03-30T00:00:00 * Date/Time End: 1999-04-10T00:00:00
Minimum DEPTH, sediment/rock: 49.11 m * Maximum DEPTH, sediment/rock: 454.77 m
Event(s):
184-1148 * Latitude: 18.836150 * Longitude: 116.565650 * Date/Time Start: 1999-03-30T00:00:00 * Date/Time End: 1999-04-10T00:00:00 * Elevation: -3294.5 m * Penetration: 1557.2 m * Recovery: 996.5 m * Location: South China Sea * Campaign: Leg184 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 133 cores; 1204.6 m cored; 352.6 m drilled; 82.7% recovery
Comment:
DEPTH, sediment/rock [m] is given in mcd. Data are from Li et al., (2003) and ODP data archive.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Aluminium oxide | Al2O3 | % | Wei, Gangjian | ||
| 4 | Calcium oxide | CaO | % | Wei, Gangjian | ||
| 5 | Potassium oxide | K2O | % | Wei, Gangjian | ||
| 6 | Magnesium oxide | MgO | % | Wei, Gangjian | ||
| 7 | Sodium oxide | Na2O | % | Wei, Gangjian | ||
| 8 | Titanium dioxide | TiO2 | % | Wei, Gangjian | ||
| 9 | Scandium | Sc | mg/kg | Wei, Gangjian | ||
| 10 | Zirconium | Zr | mg/kg | Wei, Gangjian | ||
| 11 | Lanthanum | La | mg/kg | Wei, Gangjian | ||
| 12 | Samarium | Sm | mg/kg | Wei, Gangjian | ||
| 13 | Thorium | Th | mg/kg | Wei, Gangjian |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
946 data points