Magnetostratigraphy of Abyssal Deposits in the Central Philippine Sea and Regional Sedimentary Dynamics During the Quaternary

Long, Yi; Hu, Bangqi; Zhao, Jun; Jiang, Xingyu; Shu, Yeqiang; Wang, Xingxing; Guo, Jianwei; Wang, Feifei; Ding, Xue; Liu, Geng; Chen, Weiwei; Li, Yibing; Deng, Chenglong

doi:10.1029/2021pa004365

Cited by 9 publications

(5 citation statements)

References 127 publications

(195 reference statements)

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“…Additionally, there is a transition from a large vertical spread to a more limited spread in the contours in the FORC diagrams (Figure 6), with most of the coercivity distribution within the range of 10-60 mT, and a peak at ~20 mT. The limited vertical spread and wide horizonal spread of the contours (Figure 6d,e) indicate minimal magnetostatic interactions [44,45], which is in agreement with comparable rock magnetic results from the Mariana Trench [46] and the West Philippine Basin [36].…”

Section: Sedimentary Magnetic Mineralogysupporting

confidence: 83%

“…In addition, the topmost sediments on the seafloor in the western Pacific are typically modern-deposited, while some sites could be affected by random hiatuses [36,51]. Thus, in some cases, the measured samples may contain sediments spanning tens of thousands of years.…”

Section: Discussionmentioning

confidence: 99%

“…As can be seen in Figures 3 and 4, the Eh values are relatively high in the West Philippine Basin and the Parece Vela Basin and low at the sites from the Yap and Mariana trenches. The spatial pattern of the Eh values can be attributed to the generally deeper water depths of the study sites in the two basins, where the dissolved oxygen levels are maintained by the Antarctic bottom water (AABW) [34,35] and/or the unique submarine topography [36,37].…”

Section: Spatial Distribution Of Magnetic Parametersmentioning

confidence: 99%

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Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific

Chen

Dong

Qin

et al. 2023

JMSE

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Reconstructing changes in deep/bottom-water redox conditions are critical for understanding the role of the deep ocean in global carbon and metals cycling; nevertheless, the quantitative relationships between redox proxies and abyssal dissolved oxygen are poorly investigated. In this work, we studied the rock magnetic properties of surficial sediments in the western Pacific to investigate their relationship with regional redox conditions. Our results reveal a consistent sedimentary magnetic mineral assemblage in the western Pacific, dominated by pseudo-single-domain magnetite (Fe3O4), while the ratio of detrital and biogenic magnetite particles in different sites varies substantially. Detailed analyses identified two major magnetic-coercivity components, with modal coercivity values of 13.1 ± 1.6 mT and 54.7 ± 5.3 mT, respectively. All the magnetic parameters we measured, including both concentration-dependent and grainsize-dependent parameters, and the magnetic coercivities, are generally correlated to sedimentary redox conditions; however, the coercivities obtained by mathematical unmixing exhibit a stronger linkage, explaining about a quarter of variance of redox changes. Our findings confirm the potential of magnetic properties for tracing abyssal redox changes in the western Pacific, while the observed magnetic-redox relationships are complex and need further investigation.

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Section: Sedimentary Magnetic Mineralogysupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Spatial Distribution Of Magnetic Parametersmentioning

confidence: 99%

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Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific

Chen

Dong

Qin

et al. 2023

JMSE

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“…The grain-size distributions were then analyzed using the VPCA, and the common signal of deep-sea dynamics was extracted by a PCA on the studied cores for paleoenvironmental inferences, following the procedures reported in previous studies [24,[42][43][44][45].…”

Section: Grain Sizementioning

confidence: 99%

Chronology and Sedimentary Processes in the Western Ross Sea, Antarctica since the Last Glacial Period

Liu,

Shen,

Han

et al. 2024

JMSE

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The stability of contemporary ice shelves is under threat due to global warming, and the geological records in the Ross Sea offer such an opportunity to test the linkage between them. However, the absence of calcareous microfossils in the sediments of the Ross Sea results in uncertainties in establishing a precise chronology for studies. Hence, three sediment cores were collected and studied in terms of radiocarbon dating, magnetic susceptibility, and sediment grain size to reconstruct the environmental processes in the Ross Sea since the last glacial period. The main results are as follows: (1) two grain-size components were identified for the studied cores, which can be correlated to ice-shelf and sea-ice transport, respectively; (2) due to old-carbon contamination and an inconsistent carbon reservoir, the radiocarbon dates were generally underestimated, and as an alternative, changes in magnetic susceptibility of the studied cores can be tuned to the ice-core records to establish a reliable age–depth model and; (3) integrating sediment grain-size changes and comparisons with other paleoenvironmental proxies in the Antarctic, a process from a sub-ice sheet in the last glacial period to a sub-ice shelf in the glacial maximum, and, finally, to a glaciomarine state since the last deglacial period was identified in the western Ross Sea. Integrating these findings, the warming processes in the Antarctic were highlighted in the retreat processes of the Ross Ice Shelf in the past.

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“…The study area is an enriched area for polymetallic nodules (crusts), and the polymetallic nodules are mainly distributed between water depths of 4500 m and 6200 m and are dominated by medium sized nodules [40,41]. The sedimentation rate in the study area is relatively low [20,27,42].…”

Section: Study Areamentioning

confidence: 99%

The Influence of Seamounts on the Enrichment of Rare Earth Elements in Sediments—A Case Study of the Marcus-Wake Seamounts in the Western Pacific Ocean

Xiao,

Xu,

Deng

et al. 2024

JMSE

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Deep-sea sediments enriched in rare earth elements and yttrium (REY-rich sediments) are widely distributed on the deep-sea floor, and their formation mechanism remains elusive. Although studies have recognized the link between seamounts and REY-rich sediments, in-depth analysis of the specific roles and effects of seamounts in the formation of REY-rich sediments is lacking. In this study, we analyzed surface sediments from the Marcus-Wake Seamounts for grain size, geochemistry, and mineral composition and classified the samples into three types: samples with moderate REY content and dominated by terrestrial detritus; samples with high REY and authigenic mineral content; and samples rich in CaCO3 but poor in REY. The REY in the sediments of the study area partly originate from Asian dust input and partly from seawater and/or pore water, and are mainly enriched in REY carrier particles including bioapatite fossils and micronodules. The amount of REY carrier particles influences the REY content in the sediments. The current field, primary productivity, weathering process, and depositional environment around seamounts are different from those of abyssal plains, which are conducive to the formation of REY-rich sediments. Strong bottom currents may exist in the southeastern direction of some large seamounts (e.g., Niulang Guyot), leading to the selective accumulation of REY-rich bioapatite fossils and micronodules, resulting in the formation of REY-rich sediments.

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Magnetostratigraphy of Abyssal Deposits in the Central Philippine Sea and Regional Sedimentary Dynamics During the Quaternary

Cited by 9 publications

References 127 publications

Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific

Relationships between Abyssal Redox Conditions and Rock Magnetic Properties of Surficial Sediments in the Western Pacific

Chronology and Sedimentary Processes in the Western Ross Sea, Antarctica since the Last Glacial Period

The Influence of Seamounts on the Enrichment of Rare Earth Elements in Sediments—A Case Study of the Marcus-Wake Seamounts in the Western Pacific Ocean

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