Magnetostratigraphy of a long Quaternary sediment core in the South Yellow Sea

Liu, Jianxing; Liu, Qingsong; Zhang, Xunhua; Liu, Jian; Wu, Zhiqiang; Mei, Xi; Shi, Xuefa; Zhao, Qi

doi:10.1016/j.quascirev.2016.05.025

Cited by 44 publications

(31 citation statements)

References 61 publications

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“…EM1 is identified as a coarse detrital iron oxide MD component carried by four tuffaceous samples from the NR locality of Rowan and Roberts () (Figure a). By contrast, EM2 is represented by pure SD greigite with strong magnetostatic interactions (Figure b), that is a typical signature of authigenic greigite (e.g., Chang et al, ; Florindo et al, ; Liu et al, ; Roberts et al, , ; Rowan & Roberts, ; Vasiliev et al, ). EM3 and EM4 link the other two components (Figures e and f), where both have a strong SP signal but EM3 contains a SD/vortex state detrital fraction (Figure c), while EM4 comprises a less strongly interacting SP/SD greigite component (Figure d).…”

Section: Resultsmentioning

confidence: 99%

“…It has been assumed that initial SP/SD greigite assemblages (EM3 in Figures ) continue to grow through the stable SD blocking volume with progressive sulfidization at depth to transform into such assemblages (Rowan & Roberts, ; Rowan et al, ), but marine sediment cores are usually not long enough to assess whether this progressive greigite formation mechanism is correct. Liu et al () documented strongly interacting stable SD greigite in discrete sediment layers from a long sediment core from the South Yellow Sea starting from depths of ~6 m below the sediment‐water interface. However, this shallow water setting has been subjected to major nonsteady state diagenetic changes associated with large‐amplitude Quaternary sea level variations and lack of a pore water profile makes it difficult to assess the diagenetic environment in which this greigite formed.…”

Section: Discussionmentioning

confidence: 99%

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Signatures of Reductive Magnetic Mineral Diagenesis From Unmixing of First‐Order Reversal Curves

et al. 2018

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Diagenetic alteration of magnetic minerals occurs in all sedimentary environments and tends to be severe in reducing environments. Magnetic minerals provide useful information about sedimentary diagenetic processes, which makes it valuable to use magnetic properties to identify the diagenetic environment in which the magnetic minerals occur and to inform interpretations of paleomagnetic recording or environmental processes. We use a newly developed first‐order reversal curve unmixing method on well‐studied samples to illustrate how magnetic properties can be used to assess diagenetic processes in reducing sedimentary environments. From our analysis of multiple data sets, consistent magnetic components are identified for each stage of reductive diagenesis. Relatively unaltered detrital and biogenic magnetic mineral assemblages in surficial oxic to manganous diagenetic environments undergo progressive dissolution with burial into ferruginous and sulfidic environments and largely disappear at the sulfate‐methane transition. Below the sulfate‐methane transition, a weak superparamagnetic to largely noninteracting stable single domain (SD) greigite component is observed in all studied data sets. Moderately interacting stable SD authigenic pyrrhotite and strongly interacting stable SD greigite are observed commonly in methanic environments. Recognition of these characteristic magnetic components enables identification of diagenetic processes and should help to constrain interpretation of magnetic mineral assemblages in future studies. A key question for future studies concerns whether stable SD greigite forms in the sulfidic or methanic zones, where formation in deeper methanic sediments will cause greater delays in paleomagnetic signal recording. Authigenic pyrrhotite forms in methanic environments, so it will usually record a delayed paleomagnetic signal.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Signatures of Reductive Magnetic Mineral Diagenesis From Unmixing of First‐Order Reversal Curves

et al. 2018

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“…There were three small-scale transgressions that occurred in the South Yellow Sea at ~1.66 Ma, ~1.44 Ma, and ~1.03 Ma in the Early Pleistocene (Liu et al, 2016a). The first transgression began at 1.66 Ma due to regional subsidence caused by the Zhe-Min Uplift (Liu et al, 2018).…”

Section: Sedimentary History and Marine Transgressions Since ~300 Mamentioning

confidence: 99%

“…stratigraphy using alternating demagnetization at a low sampling density. With the wide application of thermal demagnetization in river and lake sediments and the increases in the sampling density, results from continuous and high-resolution magnetic stratigraphy have moved the B/M boundary to a depth of 70-100 m in eastern China, which corresponds to the Subei Basin (Cheng Yu et al, 2016), the South Yellow Sea (Ge Shulan et al, 2005;Liu et al, 2014aLiu et al, , 2014bMei et al, 2016), the Bohai Basin (Yao et al, 2014;Li Xiang et al, 2016;Liu et al, 2016a), and the Yangtze River Delta (Duan et al, 2015, Cheng Yu et al, 2018b.…”

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confidence: 99%

“…Based on the identification and definition of transgressive layers, evidence from deep-sea oxygen isotope curves shows that Early Pleistocene and Middle Pleistocene marine strata are consistent with an interglacial period (Li Xiaoyan et al, 2015). However, transgressive chronologies are focused mainly in the South Yellow Sea and the regions adjacent to the Bohai during the Quaternary (Shi Linfeng et al, 2009;Yi et al, 2012;Liu et al, 2016aLiu et al, , 2016b. Mentions of the Subei Basin are scarce in the literature (Yang Jinghong et al, 2006;Zhang Zhenke et al, 2010).…”

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Sedimentary Evolution and Transgressions of the Western Subei Basin in Eastern China since the Late Pliocene

Cheng

Shu

et al. 2019

Acta Geologica Sinica (Eng)

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Sedimentary sequences in the Subei Basin are complex and have been affected by interactions between the ocean and rivers since the Late Pliocene, including the Yellow River, Huaihe River, and the Yangtze River. This sedimentary evolution, in particular the timing of Pleistocene transgressions, has long been a matter of controversy owing to the lack of precise chronological evidence. The aim of this study is to explore the evolution of the sedimentary environment throughout the past 3.00 Ma in this region on the basis of a comprehensive analysis of particle size and foraminifera and ostracods collected in the TZK9 core from the Subei Basin combined with geochronological studies of magnetostratigraphy, AMS14C and optically stimulated luminescence (OSL). The results show that fluvial facies in the sedimentary environment from 3.00 to 1.01 Ma. There were fluvial facies and reflects six sea‐level high stands from 1.01 to 0.25 Ma. The study area was affected by four large‐scale transgressions since 0.25 Ma. The four marine sedimentary layers known as DU7 (buried at 48–52 m), DU5 (buried at 35–41 m), DU3 (buried at 16–23 m), and DU1 (buried at 2–4 m) are recorded in the MIS7 (210–250 ka), MIS5, MIS3, and Holocene, respectively. The magnitude of the DU5 transgression was identical to that of the DU3 transgression, both were larger than the DU7 transgression, and the DU1 transgression was the weakest. The variation of transgression strength reflects the influence of global changes in sea level, tectonic subsidence, shell ridges, and sand dams. In the TZK9 core, we found evidence of seven sea‐level high stands from the Early–Middle Pleistocene, and the first one caused by regional rapid subsidence and could be traced back to 0.83‐0.84 Ma. The sea‐level high stands and the age of the first one recorded above was different from other cores in eastern China, this was caused by the lack of absolute age control and the differences in paleotopography during this period. This study reconstructs sedimentary evolution, determines the transgression and its age, establishes the chronology since the Late Pliocene, and provides a scientific framework for further paleoenvironmental and tectonic studies. The results of this study highlight the important role that local tectonics and global sea level play in the sedimentary evolution and transgressions that have occurred in the western Subei Basin.

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Population genetics and evolutionary history of the intertidal brittle star Ophiothrix (Ophiothrix) exigua in the northern China Sea

Zhang,

Hu,

Deng

et al. 2024

Ecology and Evolution

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Ophiothrix (Ophiothrix) exigua is a common brittle star in the northwestern Pacific. As a dominant species, O. exigua inhabiting the intertidal rocky ecosystem are affected by multiple environmental stressors, but molecular insights into their genetic population structure remain poorly studied. In this study, we investigated the population genetics and evolutionary history of six O. exigua populations from the northern China Sea using mitochondrial (COI, NAD4) and nuclear (ITS2, 18S) gene markers. High haplotype diversity, low nucleotide diversity, and low rates of gene differentiation among the populations of O. exigua were detected. Pairwise genetic differentiation (ΦST) statistics between different localities were negative or low and insignificant, suggesting strong gene flow of this species over the study areas. The phylogenetic analyses showed that the populations exhibited high homogeneity between localities in our study area. Demographic analyses indicated that the populations experienced sustained expansion around 0.2 million years ago. This expansion was likely related to transgressions events in the Yellow Sea during the Pleistocene period. Additional samples of O. exigua from disparate geographical locations, especially the Japan Sea and the Korean Peninsula, will be needed to unravel the population genetic patterns and evolutionary history of this species.

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Magnetostratigraphy of a long Quaternary sediment core in the South Yellow Sea

Cited by 44 publications

References 61 publications

Signatures of Reductive Magnetic Mineral Diagenesis From Unmixing of First‐Order Reversal Curves

Signatures of Reductive Magnetic Mineral Diagenesis From Unmixing of First‐Order Reversal Curves

Sedimentary Evolution and Transgressions of the Western Subei Basin in Eastern China since the Late Pliocene

Population genetics and evolutionary history of the intertidal brittle star Ophiothrix (Ophiothrix) exigua in the northern China Sea

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