Astronomical tuning and magnetostratigraphy of Neogene biogenic reefs in Xisha Islands, South China Sea

Long, Yi; Jian, Zhimin; Li, Xinyu; Zhu, Youhua; Zhang, Daojun; Wang, Zhenfeng; Deng, Changzhou

doi:10.1016/j.scib.2018.04.001

Cited by 35 publications

(33 citation statements)

References 52 publications

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“…Therefore, we developed an astronomically tuned time scale based on the high-resolution integrated pollen index. Matching paleoclimatic records to time series of orbital parameters (i.e., orbital tuning) has proven useful for developing age models and has been widely applied to marine sediments (Raymo et al, 1989; Ruddiman et al, 1989; Shackleton et al, 1990; Hilgen, 1991a, 1991b; Tian et al, 2002; Palike et al, 2006; Ao et al, 2011; Yi et al, 2018), Chinese loess-paleosol and red clay sequences (Ding et al, 1994, 2002; Lu et al, 1999; Heslop et al, 2000; Sun et al, 2006a), and continental lacustrine and fluvial strata (Prokopenko et al, 2006; Hu et al, 2007; Ao et al, 2012; Nowaczyk et al, 2013; Torres et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

East Asian winter monsoon evolution since the late Pliocene based on a pollen record from Lake Xingkai, northeast Asia

et al. 2019

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A 328.58 m drill core (XK12) was recovered from lacustrine–alluvial sediments in the Xingkai Basin, northeast China, with the aim of obtaining a high-resolution pollen record of East Asian winter monsoon (EAWM) evolution since 3.6 Ma. An index based on the pollen record of thermophilous trees and terrestrial herbs is used as an indicator of winter temperature conditions controlled by the EAWM, at the glacial–interglacial scale. Primary age control was established based on lithostratigraphy and magnetostratigraphy, and then the pollen index was correlated to the LR04 global benthic δ18O record and finally tuned to Earth orbital obliquity to produce a high-resolution astronomical time scale. The pollen record indicates that the EAWM underwent two stepwise enhancements at 2.8 and 1.6 Ma. These events are consistent with paleoclimatic records of mean quartz grain size from the Chinese Loess Plateau, and they are also in accord with the initiation and intensification of Northern Hemisphere glaciation. Our findings suggest that the variability of the EAWM since 3.6 Ma was primarily controlled by changes in global ice volume and climatic cooling.

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Section: Resultsmentioning

confidence: 99%

East Asian winter monsoon evolution since the late Pliocene based on a pollen record from Lake Xingkai, northeast Asia

et al. 2019

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“…1.6-Ma apart, were partly governed by this ca. 2-Ma super-long-term modulation in Earth's climate [51,54,55].…”

Section: Orbital Forcing Environmental Change During Early Ediacaranmentioning

confidence: 99%

“…6b). It is likely that this intensification in terrestrial weathering and runoff brought more nutrients into the oceans, thereby leading to an increase in paleo-productivity [51,55]. This increase would have been conducive to the emergence of large acritarchs in the earliest Ediacaran.…”

Section: Orbital Forcing Environmental Change During Early Ediacaranmentioning

confidence: 99%

Astronomical time scale for the lower Doushantuo Formation of early Ediacaran, South China

et al. 2018

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“…Modern observations cover the past several decades, and these data have great limitations in effectively developing models for coral reefs. For example, the changing hydrochemical characteristics in geological timescales may control coral evolution [15], and during a warm period of global climate in the middle Miocene [16], coral reefs largely developed in the Western Pacific [17,18]. Hence, it is speculated that coral reefs in different geological periods have different responses to global climate change, and studying the long-term sequence of coral reefs can provide a useful reference, supplementary to modern observations.…”

Section: Introductionmentioning

confidence: 99%

“…The South China Sea is the largest marginal sea in Asia (Figure 1). Numerous coral reefs developed in the Eocene and early Oligocene in the south [19][20][21][22][23], while in the north, reefs mainly formed on uplifted fault blocks or on volcanic seamounts [17,24] starting from the late Oligocene [18,25]. These carbonate deposits not only relate to the evolution of the South China Sea but also serve as a valuable natural resource and precious heritage.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Initiation of Biogenic Reefs in Xisha Islands, South China Sea, at the Oligo–Miocene Boundary

Liu

Chen

et al. 2021

JMSE

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Biogenic reefs and carbonate platforms are valuable natural resources, playing an important role in modulating the global climate and in carbon cycles through biological processes. Biogenic reefs in the Xisha (Paracel) Islands began in the late Oligocene and covaried with the deep-sea basin of the South China Sea and with the aeolian deposit in the Chinese Loess Plateau. Core XK-1 was drilled into the Xisha Islands to their granitic base and well dated by magnetostratigraphy, offering an opportunity to reveal the details of how the Xisha reefs initiated. In this report, the lower section of the biogenic reefs (23.0–24.5 Ma) was sampled for studying magnetic properties. The main results are as follows: (1) magnetic minerals in the XK-1 biogenic reefs are dominated by low-coercivity and relatively coarse-grained magnetite; (2) the variabilities of magnetic parameters can be clustered into two sections around 23.6 Ma, and the differences between the two units are evident both in the amplitudes and the means; and (3) changes in the concentration-dependent magnetic parameters can be well correlated with the records of global deep-sea oxygen and carbon isotopes, and the sea level during the Oligo–Miocene boundary. Based on these results, a close link was inferred between biogenic reef evolution in the Xisha Islands and global climate change. This link likely highlights the covariation or the dominant role of the Asian monsoon in biogenic reefs and involves different responses to global temperature, CO2, and sea-level changes on various timescales. Therefore, we proposed that the origin of biogenic reefs in the Xisha Islands was likely paced by orbital obliquity from a long-term perspective.

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Astronomical tuning and magnetostratigraphy of Neogene biogenic reefs in Xisha Islands, South China Sea

Cited by 35 publications

References 52 publications

East Asian winter monsoon evolution since the late Pliocene based on a pollen record from Lake Xingkai, northeast Asia

East Asian winter monsoon evolution since the late Pliocene based on a pollen record from Lake Xingkai, northeast Asia

Astronomical time scale for the lower Doushantuo Formation of early Ediacaran, South China

Magnetic Properties and Initiation of Biogenic Reefs in Xisha Islands, South China Sea, at the Oligo–Miocene Boundary

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