Late Cenozoic history of deep water circulation in the western North Pacific: Evidence from Nd isotopes of ferromanganese crusts

Hu, Rong; Chen, Tianyu

doi:10.1007/s11434-012-5322-9

Cited by 16 publications

(2 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[14] While the e Nd evolution of MKD13 (water depth = 1530 m) is similar to that of the nearby crust D11-1 from a similar water depth (water depth = 1700 m, Figure 2), MDD53 (water depth = 2700 m) differs from its neighboring shallow crust MKD13 by its systematically less radiogenic Nd isotope compositions over the last 10 Myr ( Figure A2). These crusts may have been under the influence of different water masses within the deep western boundary current system [Kawabe and Fujio, 2010;Hu et al, 2012], yet Pb isotope compositions of MDD53 are not distinctively different from MKD13 ( Figure A2). In contrast to Pb isotopes, the e Nd signatures of the studied crusts do not show distinct regional distributions ( Figure 2).…”

Section: A Comparison Between the New Records And Published Datamentioning

confidence: 99%

Lead isotope provinciality of central North Pacific Deep Water over the Cenozoic

Chen

Jiang

2013

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

[1] Understanding the pre-anthropogenic Pb cycle of central North Pacific deep water has attracted a lot of attention in recent years, partly because of its unique geographical location in that it is a remote gyre system characterized by high dust fluxes and sluggish overturning circulation. However, the factors controlling Pb isotope evolution in this area over the Cenozoic are still controversial and various mechanisms have been proposed in previous studies. Here we report new Pb and Nd isotope time series of four ferromanganese crusts (two from the western Pacific near the Mariana arc and the other two from the central Pacific). Together with previously published records, we discuss for the first time the significance of a persistent and systematic Pb isotopic provinciality recorded by central North Pacific crusts over the Cenozoic. We propose that globally well mixed stratosphere volcanic aerosols could contribute Pb but have not been the major factors controlling the Pb isotope distribution in the central North Pacific over time. Island arc input (and probably enhanced hydrothermal input between about 45 and 20 Ma) likely controlled the Pb isotope provinciality and evolution prior to~20 Ma, when coeval Pb isotope records in different crusts showed large differences and atmospheric silicate dust flux was extremely low. After the Eocene, in particular after 20 Ma, Asian dust input has become an isotopically resolvable source, while island arc-derived Pb has remained important to balance the dust input and to produce the observed Pb isotope distribution in the central North Pacific during this period.Components: 9,200 words, 7 figures.

show abstract

Section: A Comparison Between the New Records And Published Datamentioning

confidence: 99%

Lead isotope provinciality of central North Pacific Deep Water over the Cenozoic

Chen

Jiang

2013

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

show abstract

“…Submarine Fe-Mn crusts and nodules are chemical sedimentary rocks mainly comprising Fe and Mn (oxyhydr)oxides with a small amount of detrital materials (e.g., [1]) that record paleoenvironmental information about the ocean (e.g., [2][3][4][5][6]). They simultaneously provide geochronological information based on the variations in their chemical (e.g., Co content) and isotopic (e.g., 10 Be/ 9 Be and 187 Os/ 188 Os) compositions [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

87Sr/86Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean

et al. 2022

View full text Add to dashboard Cite

In this study, the Sr isotope ratios (IRs; 87Sr/86Sr) of ferromanganese (Fe–Mn) crusts are analyzed through laser ablation inductively coupled plasma multiple-collector mass spectrometry. A sample collected from off Minamitorishima Island showed uniform Sr IRs (0.70906–0.70927) similar to that of present-day seawater with more than 36 mm thickness. Meanwhile, a detritus-rich sample collected from off northeast (NE) Japan showed a wide variation in Sr IRs (0.707761–0.709963). The Sr IR variation in the Fe–Mn crust from off NE Japan suggests detrital influx contributions from both the NE Japan arc (<0.708) and aeolian dust from China (>0.718). Detrital flux from the NE Japan arc increases from the bottom to middle layers, possibly due to the uplift of the Ou backbone range that occurred after ~2 Ma. The increased influx of the aeolian dust in the outer layer is attributable to global cooling in the Quaternary that increased the loess dust transportation from China to the western North Pacific Ocean. Meanwhile, the influence of the detrital influx on the sample from off Minamitorishima Island appeared to be negligible. The Sr IR analysis with high spatial resolution proposed in this study possibly improves the burial history of Fe–Mn nodules.

show abstract

Improving confidence in ferromanganese crust age models: A composite geochemical approach

et al. 2019

View full text Add to dashboard Cite

Late Cenozoic history of deep water circulation in the western North Pacific: Evidence from Nd isotopes of ferromanganese crusts

Cited by 16 publications

References 66 publications

Lead isotope provinciality of central North Pacific Deep Water over the Cenozoic

Lead isotope provinciality of central North Pacific Deep Water over the Cenozoic

87Sr/86Sr Isotopic Ratio of Ferromanganese Crusts as a Record of Detrital Influx to the Western North Pacific Ocean

Improving confidence in ferromanganese crust age models: A composite geochemical approach

Contact Info

Product

Resources

About