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| Titel |
Sr and Nd Isotopic Compositions as Tracers for Source-to-Sink Pathways of Sediments in the Taiwan Strait |
| VerfasserIn |
F.-Y. Hu, C.-F. You, H.-C. Liu, H.-C. Chao, B.-S. Wang, C.-A. Huh, C.-H. Chung |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066803
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| Zusammenfassung |
| Sr and Nd isotopes are excellent tracers for various geochemical processes, in particular for
provincial identification. The sediments source-to-sink pathways and the spatial
variation of lateral fluxes in Taiwan Strait have been an important issue for past
decades.
Surface sediments provide useful diagnostic details among ocean currents, sources
and transport processes. In this study, more than 20 surface sediments collected
from the Taiwan Strait including near estuary stations in western and southwestern
coast of Taiwan, as well as Pearl River and Yangtze River in China. To simplify the
mixing scenario, carbonate and adsorption phases of sediments were chemically
removed before acid digestion. Concentrations of major and trace elements and Sr,
Nd isotope of the residual solids were measured by ICP-MS and MC-ICP-MS,
respectively.
The 87Sr/86Sr results show distinct four end-members mixing, including sediments from
Taiwan Island, Penghu Island, Pearl River and Yangtze River. The samples near the
southeastern coast of China show higher, ratios, 0.7234 to 0.7273, indicate mixing between
sediments derived from Pearl River and Yangtze River. On the other hand, most of the Taiwan
Strait stations show lower 87Sr/86Sr (0.7178 to 0.72048) and also smaller variations
in both concentrations and isotopic ratios, indicating contribution from Taiwan
and Penghu. The contribution of Yangtze River to northwestern Taiwan Strait is
estimated to be higher than 60%, whereas the Taiwan Strait stations show higher
contribution from Taiwan. Further systematic in Nd and Sr isotopic results will provide
constraints to quantify various source contributions in spatial and temporal variation. |
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