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

Dou, Yanguang; Yang, Shouye; Liu, Zhenxia; Shi, Xuefa; Li, Jun; Yu, Ho‐Shing; Berné, Serge

doi:10.1016/j.palaeo.2012.09.003

Cited by 82 publications

(44 citation statements)

References 58 publications

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“…Brown inverted triangle represents eastern Taiwan Island river samples continental shelf, and Taiwan Island sources (Fig.5). This result is consistent with the alternation of 87 Sr/ 86 Sr and εNd values during 14-7.1 ka in nearby core DGKS9603 (Dou et al, 2012). Clay mineral and geochemical records in the southern Okinawa Trough also indicate the change of provenance since the early Holocene as a response to KC intensifi cation (Diekmann et al, 2008).…”

Section: Fig5 End-member Analysis Of Provenance Using (A) a Ternary supporting

confidence: 84%

“…Some scholars believe that a large volume of sediments from eastern Taiwan Island could be transported by the KC to the southern Okinawa Trough, even dispersing further north into the middle and northern part of the trough (Hsu et al, 2004;Lee et al, 2004;Dou et al, 2012). Others, however, have demonstrated that sediments along the middle and northern slope of the trough derive mainly from the Changjiang or old Huanghe River.…”

Section: Clay Mineral and Provenance Implicationmentioning

confidence: 99%

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Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system

Zheng

Wan

et al. 2015

Chin. J. Ocean. Limnol.

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The Okinawa Trough is a natural laboratory for the study of air-sea interaction and paleoenvironmental change. It has been demonstrated that present offshore export of particles in the bottom nepheloid layer occur primarily with downwelling from the northeast winter monsoon, which is inhibited by a transverse circulation pattern in summer. This current system was very different during the Last Glacial Maximum owing to low sea level (-120 m) and exposure of a large shelf area. We collected sediment core Oki01 from the middle Okinawa Trough during 2012 using R/V Kexue No . 1 to elucidate the timing and cause of the current system transition in the East China Sea. Clay mineral, dry density, and elemental (Ti, Ca) composition of core Oki01 was analyzed. The results indicate that clay minerals derived mainly from the Huanghe (Yellow) and the Changjiang (Yangtze) Rivers during 16.0-11.6 ka, and the modern current system in the East China Sea formed beginning in the early Holocene. Therefore, mixing of East China Sea continental shelf, Changjiang River and partially Taiwan Island sediment are the major contributors. The decrease of log(Ti/Ca) and alternating provenance since the early Holocene indicate less sediment from the East China in summer because of resistance of the modern current system, i.e., a "water barrier" and upwelling. Conversely, sediment delivery persists in winter and log(Ti/Ca) indicates the winter monsoon signal since the early Holocene. Our evidence also suggests that sediment from Taiwan Island could be transported by the Kuroshio Current to the middle Okinawa Trough, where it mingles with winter monsooninduced export of sediment from the Changjiang River and East China Sea continental shelf. Although the present research advances understanding of the evolutionary history of paleoenvironmental change in the Okinawa Trough, more sediment cores should be retrieved over wide areas to construct a larger scenario.

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Section: Fig5 End-member Analysis Of Provenance Using (A) a Ternary supporting

confidence: 84%

Section: Clay Mineral and Provenance Implicationmentioning

confidence: 99%

Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system

Zheng

Wan

et al. 2015

Chin. J. Ocean. Limnol.

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“…Therefore, the trough is an ideal natural laboratory for studying land-sea interaction and paleoenvironmental change in the northwestern Pacific marginal seas during the late Quaternary (Tada et al, 2013). In this respect, the Okinawa Trough has attracted interest regarding its sediment provenance, formation age, and evolution since the last glaciation in response to the aforementioned factors (e.g., Diekmann et al, 2008;Dou et al, 2012;Li et al, 2014;Meng et al, 2009;Xiang et al, 2007;Xu et al, 2014a;Zheng et al, 2011Zheng et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

“…Drastic changes in sea level, marine circulation, the East Asian monsoon, and riverine input since the late last glaciation (Jian et al, 2000;Li et al, 2005Li et al, , 2009Li et al, , 2014Liu et al, 2004;Saito et al, 1998;Ujiié and Ujiié, 1999;Ujiié et al, 2001;Xu and Oda, 1999) make construction of the sedimentary archives of the trough challenging. For example, clay mineral and geochemical studies have partly solved sediment provenance, but discrimination of the relative contributions of the Huanghe and the Changjiang, continental shelf erosion, and Taiwan sources, especially in the northern Okinawa Trough, need further study (Dou et al, 2012;Hsu et al, 2004;Xu et al, 2012aXu et al, ,b, 2014a. The sediment contribution from continental shelf erosion and/or Taiwan runoff into the northern Okinawa Trough deposition may have been overlooked and their potential underestimated in previous research.…”

Section: Introductionmentioning

confidence: 99%

“…Among these indices, Sr-Nd isotopic compositions of detrital fractions have been proven useful tracers on sediment provenance (Dou et al, 2012;Hu et al, 2012;Xu et al, 2014b;Yang et al, 2007a,b). However, a comprehensive provenance discrimination based on Sr-Nd isotopic compositions has not been conducted for core sediments in the northern Okinawa Trough to date.…”

Section: Introductionmentioning

confidence: 99%

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Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

Lim

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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ITCZ and ENSO pacing on East Asian winter monsoon variation during the Holocene: Sedimentological evidence from the Okinawa Trough

Zheng

Wan

et al. 2014

JGR Oceans

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Deep-sea fan sediments provide an excellent geological archive for paleoenvironment reconstruction. Grain size, clay mineral and elemental (Ti, Fe, Ca) compositions were measured for a core retrieved from a submarine fan in the Okinawa Trough. Varimax-rotated Principal Component Analysis (V-PCA) on time-evolution of grain size spectrum reveals that, since the Holocene, sediment was transported mainly by the benthic nepheloid layer (33%) and upper layers (33%) which is driven by the East Asian winter monsoon (EAWM). The intensification of the Kuroshio Current during the Holocene, masks the fluvial signal of the summer monsoon and obstructs clay minerals derived from the Yellow River, a major contributor prior to 12 ka BP. A new grain size index (GSI), which represents the EAWM well, exhibits a negative correlation with the d 18 O record in Dongge Cave, China during the Holocene when sea level was relatively steady. This anticorrelation suggests the southward migration of the Intertropical Convergence Zone (ITCZ). The consistency among our records and rainfall records in Peru, Ti counts in the Cariaco Basin, monsoon records in Oman and the averaged summer insolation pattern at 30 N further support the ITCZ's impact on monsoon systems globally. Cross-Correlation Analyses for GSI and log(Ti/Ca) against d 18 O record in Dongge Cave reveal a decoupling between the East Asian winter and summer monsoon during 5500-2500 cal yr BP, with greater complexity in the last 2500 years. This can be attributed to exacerbated ENSO mode fluctuations and possibly anthropogenic interference superimposed on insolation and ITCZ forcing.

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

Cited by 82 publications

References 58 publications

Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system

Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system

Sr–Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary

ITCZ and ENSO pacing on East Asian winter monsoon variation during the Holocene: Sedimentological evidence from the Okinawa Trough

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