Sediment−magnetic signature of the mid-Holocene paleoenvironmental change in the central Okinawa Trough

Liu, Jian; Zhu, Rixiang; Li, Tiegang; Li, Anchun; Li, Jun

doi:10.1016/j.margeo.2006.12.011

Cited by 23 publications

(11 citation statements)

References 49 publications

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“…6), also suggesting the gradually increasing influence of the Kuroshio Current in the Okinawa Trough. Nevertheless, some other studies suggested that the main Kuroshio Current had an abrupt change at about 7 ka in the Okinawa Trough (Jian et al, 1998(Jian et al, , 2000Liu et al, 2007), and did not exhibit a gradual change at 14 ka. We infer that these differences are related to the uncertainty of each Liu et al (1994) and Yokoo et al (2004); c Meng et al (1999); d Biscaye et al (1997); e Meng et al (2001) Table 3.…”

Section: Indication Of Changing Sediment Provenances To Oceanic Circumentioning

confidence: 96%

“…Previous studies on the pathway of the Kuroshio Current in the Okinawa Trough are mainly based on the abundances and assemblages of planktonic foraminifera, planktonic δ 18 O values, sea surface temperature, and sediment characters (Li et al, 1997;Jian et al, 1998;Liu et al, 1999;Ujiié and Ujiié, 1999;Jian et al, 2000;Liu et al, 2007;Xiang et al, 2007;Diekmann et al, 2008;Yu et al, 2009). To date, the intensity and main pathway of the Kuroshio Current in the trough during the late Quaternary are still controversial (Bard, 2001;Mix et al, 2001).…”

Section: Indication Of Changing Sediment Provenances To Oceanic Circumentioning

confidence: 99%

“…However, some other studies argued that the main Kuroshio Current did not move away from the Okinawa Trough during the LGM (Xu and Oda, 1999;Ijiri et al, 2005;Li et al, 2005). The main reason for such large uncertainties in the variability of the Kuroshio Current pathway is partially due to ambiguities in understanding the indications of diverse proxies (Liu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…A lot of proxies including micropaleontological, clay mineralogical, element geochemical and magnetic methods have been widely applied to identify the origins of Quaternary sediments in the Okinawa Trough (Chen et al, 1982;Jian et al, 1998Jian et al, , 2000Liu et al, 2007;Diekmann et al, 2008;Dou et al, 2010a,b;Chen et al, 2011). The radiogenic SrNd isotope system is more informative on sediment provenance than clay minerals and element geochemical data because they generally record more petrographic signature of parent rocks (Ehlert et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Sr–Nd isotopic constraints on terrigenous sediment provenances and Kuroshio Current variability in the Okinawa Trough during the late Quaternary

Dou

Yang

Liu

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Indication Of Changing Sediment Provenances To Oceanic Circumentioning

confidence: 96%

Section: Indication Of Changing Sediment Provenances To Oceanic Circumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sr–Nd isotopic constraints on terrigenous sediment provenances and Kuroshio Current variability in the Okinawa Trough during the late Quaternary

Dou

Yang

Liu

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Over the last two decades, many scientists have attempted to identify the origin of sediment in the middle Okinawa Trough using mineralogical (Chen et al, 1982;Dou et al, 2010), oceanographic and paleoceanographic (Jian et al, 1998(Jian et al, , 2000Liu et al, 1999Liu et al, , 2000Ujiié and Ujiié, 1999;Liu, 2005), environmental magnetic (Liu et al, 2007a), as well as geochemical methods (Zhao and Yan, 1992;Meng et al, 2007). These studies suggested that the terrigenous sediment sources of the Okinawa Trough predominantly include direct supply from major rivers in East Asia, particularly the Changjiang (Yangtze River) and Huanghe (Yellow River) (Katayama and Watanabe, 2003), and lateral transport from the East China Sea shelf through the bottom layers (Honda et al, 2000;Iseki et al, 2003;Oguri et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Provenance discrimination of siliciclastic sediments in the middle Okinawa Trough since 30ka: Constraints from rare earth element compositions

et al. 2010

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The late Quaternary paleoceanography and paleoenvironment in the Okinawa Trough, East China Sea, have been well reconstructed over the last decade, while in contrast the provenance of terrigenous sediments that have accumulated there remains enigmatic. In this study, rare earth elements (REE) were used to investigate provenance changes in sediments from Core DGKS9604, taken from the middle Okinawa Trough. Discrimination plots based on REE fractionation parameters suggest that the cored sediments have variable provenances over the last 30 ka, with the lower part (ca. 31-8.2 ka) ultimately originating mostly from the Changjiang (Yangtze River) and the upper part (7.1-0 ka) primarily from Taiwan. During the Last Glacial Maximum and early deglacial period, sea level was low and the main stream of the Kuroshio Current was deflected to the east of the Ryukyu Islands. As a result the Changjiang-derived sediments might have dominated sedimentation of the middle Okinawa Trough. However, since about 7 ka the main stream of the Kuroshio Current strengthened in the area of the trough, as sea level approximated the modern position. This caused near-bottom transport of fine-grained sediments from the continental margin to the trough to become weak and instead, Taiwan-derived terrigenous sediments dominated in the middle trough. The changing provenances of terrigenous sediments into the middle Okinawa Trough are closely related to the evolution of oceanic circulation and sea level in the East China Sea. Two tephra layers in the core have distinct REE compositions and correlate well with two volcanic eruptions at 7.6 and 25.8 ka in southern Japan.

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New evidence for Kuroshio inflow and deepwater circulation in the Okinawa Trough, East China Sea: Sedimentary mercury variations over the last 20 kyr

Lim

Kim

et al. 2017

Paleoceanography

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The evolution of the Kuroshio Current (KC) in the Okinawa Trough (OT) has long been of paleoceanographic interest and has been the focus of many investigations because of its large impacts on both the ocean environment and the climate in East Asia. Here we present a new high‐resolution mercury (Hg) record from the OT sediments that provides robust evidence for the glacial‐interglacial variabilities of KC inflow. The Hg levels are anomalously high in the Holocene deposits, which feature a large and abrupt Hg increase at ~9.6 ka and a significant drop at 4.5–3.2 ka. Our observations show that most Hg was derived from seafloor hydrothermal plumes via active lateral transportation. Thus, the generally high Hg levels since ~9.6 ka are associated with enhanced basin‐wide deepwater circulation triggered by the KC inflow. This driving mechanism for the deposition and widespread of Hg is also evidenced by an abrupt drop in Hg levels during the late Holocene neoglacial cold period (~5–3 ka) when the KC inflow was temporarily interrupted and deepwater circulation was consequently weak or even absent in the OT. The changes in sedimentary Hg appear to be synchronous with those in other geochemical proxies that suggest that bottom water conditions switched from anoxic to oxic due to increased upwelling from the bottom in tandem with the strengthening KC and reduced freshwater effect since ~9.6 ka. This study shows that the hydrothermal Hg is a sensitive and independent tool for the reconstruction of paleodynamics of KC in the OT.

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Sediment−magnetic signature of the mid-Holocene paleoenvironmental change in the central Okinawa Trough

Cited by 23 publications

References 49 publications

Sr–Nd isotopic constraints on terrigenous sediment provenances and Kuroshio Current variability in the Okinawa Trough during the late Quaternary

Sr–Nd isotopic constraints on terrigenous sediment provenances and Kuroshio Current variability in the Okinawa Trough during the late Quaternary

Provenance discrimination of siliciclastic sediments in the middle Okinawa Trough since 30ka: Constraints from rare earth element compositions

New evidence for Kuroshio inflow and deepwater circulation in the Okinawa Trough, East China Sea: Sedimentary mercury variations over the last 20 kyr

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