Abstract：River systems are particularly sensitive to tectonic movements,climate and sea-level changes,and the history of these processes can be decoded by provenance analysis. Samples of modern surface sediments,the Mid-Holocene and the Last Glacial Maximum(LGM)core sediments in the Yangtze River Delta were analyzed with heavy-mineral composition and zircon U-Pb age spectra,aiming to decode the variation in estuarine sediment provenance in response to different climate conditions. In comparison with the LGM sediments,the Mid-Holocene sediments have less sphene and zircon content,higher GZi value,fewer zircons from the Cretaceous and Neoproterozoic but more zircons from the Paleoproterozoic. It was suggested that there were more sediments sourced from the upper reach in the Mid-Holocene than in the LGM, and this phenomenon may be linked with variations of summer monsoon precipitation in the catchment. Less sediments from the upper reach were transported into the sea during the LGM weak monsoon period because of the sharp decrease in precipitation and runoff,while they significantly increased in the Holocene with the strengthening monsoon and the consequent precipitation and runoff,typically during the Mid-Holocene Climatic Optimum with the strongest summer monsoon.
Wang Yangyang,Fan Daidu. Provenance characteristics of the late Quaternary in the Yangtze River Delta and its response to monsoon climate change[J]. JOPC, 2013, 15(6): 853-864.
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