Sedimentary evidence for a period of rapid environmental change in the Yangtze River Delta, China around 150 years ago

Niu, Wenlei; Zhao, Luo; Switzer, Adam D.; Zhai, Yang; Zhang, Wentong; Wang, Zhanghua

doi:10.1016/j.csr.2021.104552

Cited by 3 publications

(19 citation statements)

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“…10 km seaward of the shipwreck site. Previously published AMS 14 C ages in the two cores suggested that the dated materials are mostly reworked from older deposits (Niu et al, 2021). Niu et al (2021) also reported the overestimated medium-grained (45-63 μm) quartz ages compared with the age of porcelain artifacts recovered from the sunken ship.…”

Section: Introductionmentioning

confidence: 86%

“…Previously published AMS 14 C ages in the two cores suggested that the dated materials are mostly reworked from older deposits (Niu et al, 2021). Niu et al (2021) also reported the overestimated medium-grained (45-63 μm) quartz ages compared with the age of porcelain artifacts recovered from the sunken ship. In this study, we further examined the fine-grained (4-11 μm) quartz OSL ages in these two cores and made comparison with results of other dating techniques, including the mediumgrained OSL ages and ages inferred from 210 Pb and 137 Cs dating, porcelain artifacts, and macro-plastic distribution.…”

Section: Introductionmentioning

confidence: 86%

“…The Yangtze River Delta is a typical tide-dominated river delta (Figure 1; Goodbred and Saito, 2012) and there have Niu et al, 2021). (B) Locations of cores KZ01-A and KZ02 in the present-day North Channel and the turbidity maximum zone (TMZ; after Shen and Pan, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…(B) Locations of cores KZ01-A and KZ02 in the present-day North Channel and the turbidity maximum zone (TMZ; after Shen and Pan, 2001). (C) Bathymetry of the Yangtze River mouth in 1842 CE, showing the location of core KZ01-A at the northeast margin of the Tongsha Shoal and core KZ02 at water depth between 5 and 10 m (the delta front slope) (after Niu et al, 2021). The bathymetry map of 1842 CE is based on the marine chart of the British Navy.…”

Section: Introductionmentioning

confidence: 99%

“…In 2017, we collected two sediment cores (KZ01-A and KZ02) in the offshore section of the North Channel, which is located in the TMZ and the delta front platform of Yangtze River mouth (Figure 1; Niu et al, 2021). Core KZ01-A was collected at a shipwreck site; core KZ02 was collected in the Channel ca.…”

Section: Introductionmentioning

confidence: 99%

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Luminescence characteristics of muddy sediments in the turbidity maximum zone of the Yangtze River mouth and implications for the depositional mechanisms

Niu

Nian

Zhao³

et al. 2022

Front. Earth Sci.

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Muddy sediments are the most prominent constituents of sedimentary successions in tide-dominated river deltas and have highly complex depositional mechanisms. In this study, we performed fine-grained (4–11 μm) quartz optically stimulated luminescence (OSL) dating on two sediment cores collected at a shipwreck site in the turbidity maximum zone (TMZ) of the modern Yangtze River mouth, China, which were compared with previously published dating results including 45–63 um quartz OSL dating, radionuclide dating, porcelain artifacts recovered from the wreck, macro-plastics, and the morphological history recorded in marine charts. We investigate the luminescence characteristics of muddy sediments trapped in the TMZ and discuss the implications of OSL ages in understanding depositional mechanisms in tide-dominated river mouths. The results indicate that most OSL ages of muddy sediments in the delta front setting are overestimated compared with other dating methods. We suggest that OSL age overestimation reflects the trapping of sediments from offshore in the TMZ imported by saltwater intrusions and storm events. The offshore inputs contain high percentages of residual luminescence and are also subjected to incomplete bleaching due to turbid water conditions and near-bed dispersal in the salt-wedge river mouth. We thus suggest that the reduced bleaching efficiency of muddy sediments in delta front settings needs to be accounted for in understanding sedimentary processes and distinguishing between different sedimentary facies in tide-dominated river mouths. Furthermore, we propose that differences in quartz OSL ages of fine- and medium-grained fractions may arise in response to extreme events.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 86%