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Riverine Sediment Geochemistry as Provenance Fingerprints along the Eastern Coast of China: Constraint, Approach, and Application

1
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
2
Zhejiang Dajing Ecological Environment Technology Company Limited, Ningbo 315042, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(1), 29; https://doi.org/10.3390/min10010029
Received: 2 November 2019 / Revised: 6 December 2019 / Accepted: 24 December 2019 / Published: 28 December 2019
(This article belongs to the Section Mineral Geochemistry and Geochronology)
Sediment geochemistry is affected by sediment granularity and chemical partition, which may greatly influence the accuracy of sediment source identification. In this study, we analyzed Ca, Co, Zr, V, Cr, Ti, Sc, Th, and Al in the sediments of major rivers and a Holocene core along the eastern coast of China to reveal the constraints on sediment geochemistry related to granularity and chemical partition and to try and identify the sources of the sediments present in the core. The results reveal that the element concentrations have a significant positive correlation with Al concentration in all these riverine sediments. There are significant differences in the element contents of the bulk sample and the residual sediment leached with acid, including in their ratios. The ratios of Cr/Th–Sc/Th, which is often used for provenance discrimination, reveal that uncertainty of provenance discrimination will increase if the impact of sediment granularity and chemical phase on the index system is not considered. We applied this geochemical approach for provenance on a Holocene core of the East China Sea using Cr/Th–Al, Sc/Th–Al, Ti/Zr–Al, and Cr/Th–Sc/Th with the same granularity as the residue sediments. Based on this approach, we identified the core sediments to have had a large component derived from the western Taiwanese rivers since the mid-Holocene. This study sheds light on the sediment geochemistry used to identify the provenance of marginal seas with multiple rivers entering them. View Full-Text
Keywords: provenance discrimination; grain size; acid-leached fraction; Yangtze River; western Taiwanese rivers; inner-shelf mud wedge of the East China Sea provenance discrimination; grain size; acid-leached fraction; Yangtze River; western Taiwanese rivers; inner-shelf mud wedge of the East China Sea
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Chen, J.; Liu, P.; Sun, D.; Zhang, D.; Miao, B.; Chen, J. Riverine Sediment Geochemistry as Provenance Fingerprints along the Eastern Coast of China: Constraint, Approach, and Application. Minerals 2020, 10, 29.

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