Assessing effective provenance methods for fluvial sediment in the South China Sea

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doi: 10.1144/SP429.3
Author(s): Clift, Peter D.
Author Affiliation(s): Primary:
Louisiana State University, Department of Geology and Geophysics, Baton Rouge, LA, United States
Volume Title: River-dominated shelf sediments of east Asian seas
Volume Author(s): Clift, P. D., editor; Harff, J.; Wu, J.; Qui, Y.
Source: River-dominated shelf sediments of east Asian seas, edited by P. D. Clift, J. Harff, J. Wu and Y. Qui. Special Publication - Geological Society of London, 429(1), p.9-29. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719 CODEN: GSLSBW
Note: In English. 138 refs.Online First; illus., incl. 1 table, sketch maps
Summary: Sediment is delivered by the rivers of SE Asia to the South China Sea where it provides an archive of continental environmental conditions since the Eocene. Interpreting this archive is complicated because sediment may be derived from a number of unique sources and the rivers themselves have experienced headwater capture that also affects their composition. A number of methods exist to constrain provenance, but not all work well in this area. Anthropogenic impacts, most notably agriculture, mean that the modern rivers contain more weathered materials than they did up until about 3000 years ago. The rivers have also changed their bulk chemistry and clay mineralogy in response to climate change, so that these proxies, as well as Sr isotopes, are generally unreliable provenance indicators. Nd isotopes resolve influx from Luzon, but many other sources in SE Asia have similar values and clear resolution of end members can be difficult. Instead, thermochronology methods are best suited, especially apatite fission track, which shows more diversity in the sources than either U-Pb zircon or Ar/Ar muscovite dating. Nonetheless, even fission track is best used as part of a multiproxy approach if a robust quantitative budget is desired.
Year of Publication: 2015
Research Program: ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; Alkaline earth metals; Apatite; Ar/Ar; Asia; Borneo; Chemical composition; Chemical weathering; China; Clay minerals; Drainage; Far East; Fission-track dating; Geochronology; Guangdong China; Indochina; Isotope ratios; Isotopes; Leg 184; Luzon; Malay Archipelago; Marine environment; Mekong River; Metals; Methods; Mica group; Muscovite; Nd-144/Nd-143; Neodymium; Nesosilicates; North Pacific; Northwest Pacific; ODP Site 1144; ODP Site 1148; Ocean Drilling Program; Orthosilicates; Pacific Ocean; Paleogeography; Philippine Islands; Phosphates; Provenance; Rare earths; Reconstruction; Sediment transport; Sediments; Sheet silicates; Shelf environment; Silicates; Song Hong River; South China Sea; Sr-87/Sr-86; Stable isotopes; Strontium; Taiwan; Tectonics; Terranes; Thermochronology; Transport; U/Pb; Weathering; West Pacific; Xizang China; Zhujiang River; Zircon; Zircon group
Coordinates: N185010 N185010 E1163356 E1163356
N200311 N200311 E1172508 E1172508
Record ID: 2015099249
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom