Differentiating detrital and pedogenic contributions to the magnetic properties of aeolian deposits in the southern Tibetan Plateau: Implications for paleoclimatic reconstruction

Yang, Junhuai; Xia, Dunsheng; Chen, Zixuan; Wang, Shuyuan; Gao, Fuyuan; Liu, Xin; Zhao, Shuang; Zhao, Lai; Liu, Yan

doi:10.1016/j.catena.2022.106736

Cited by 13 publications

(7 citation statements)

References 68 publications

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“…The pedogenic magnetic susceptibility is mainly controlled by pedogenesis intensity (Song et al., 2010; Zhou et al., 1990). χ fd can reflect the magnetic susceptibility of the pedogenic fraction, and has therefore been used to infer the pedogenesis intensity in the southern TP (Cheng, Yang, Long, Song, Chen, et al., 2023; Cheng, Yang, Long, Song, Miao, et al., 2023; Cheng, Yang, Long, Zhang, et al., 2023; Feng, Wang, et al., 2022; Gao et al., 2023; Yang et al., 2022, 2023), although χ fd is not sensitive for pedogenesis intensity at its low values. a* is controlled primarily by hematite (Sun et al., 2011; Yang & Ding, 2003), which is mainly a product of pedogenesis.…”

Section: Discussionmentioning

confidence: 99%

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Cheng,

Long,

Zhang

et al. 2024

JGR Earth Surface

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The Tibetan Plateau (TP) serves not only as the “water tower” of Asia but also as an important source in the global atmospheric dust cycle. While our knowledge of modern dust activity and its impacts and interactions with climate change in the TP has greatly advanced in the past decades, the emission, transport, and deposition of dust on the geological time scale remains unclear. This study analyzed a 7.6‐m thick sedimentary sequence consisting of loess and sand from the Yarlung Tsangpo River (YTR) valley in the southern TP. The sequence chronology was established using nineteen K‐feldspar post‐infrared infrared stimulated luminescence (pIRIR) ages, which ranged from 47.11 ± 1.95 to 116.65 ± 5.55 ka in a general stratigraphical order. The dust sedimentation rate and sorting coefficient of grain size were used to reflect dust activity and near‐surface wind, respectively. The results indicated that dust activity in the southern TP is mainly regulated by the near‐surface wind intensity and follows the variation pattern of precession, although the waxing and waning of mountain glaciers also affect the amplitude of dust activity. This pattern is not consistent with the Greenland dust record, which follows the variation pattern of obliquity. Therefore, dust accumulation in the southern TP is concluded to be primarily controlled by the South Asian winter monsoon (SAWM) forced by precession, whereas dust accumulation in Greenland is closely related to the intensity of the high‐level westerlies forced by obliquity.

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Section: Discussionmentioning

confidence: 99%

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Cheng,

Long,

Zhang

et al. 2024

JGR Earth Surface

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“…These minerals behave as superparamagnetic, viscous single domain, or stable single‐domain magnetic particles (Q. Liu et al., 2005). Larger detrital magnetic grains are carried with silt‐ and/or sand‐sized sediment accumulated by depositional processes (Hatfield, 2014; J. Yang et al., 2023). Detrital magnetic grains are stable single‐domain and multidomain particles that derive from preexisting minerals eroded out of metamorphic and igneous rock.…”

Section: Discussionmentioning

confidence: 99%

“…Liu et al, 2005). Larger detrital magnetic grains are carried with silt-and/or sand-sized sediment accumulated by depositional processes (Hatfield, 2014;J. Yang et al, 2023).…”

Section: Grain Sizes Of the Fe Oxidesmentioning

confidence: 99%

“…However, attributing soil magnetic and color properties to moisture alone is difficult because monsoonal rainfall and temperature are closely linked. Synchronous changes of rainfall and temperature have been observed to strongly influence the phases of Fe oxides accumulated within soils (W. Balsam et al., 2004; J. Yang et al., 2023). Moreover, temperature alone may account for Fe oxides changes that occur as a result of increased chemical weathering during dramatic warming of the monsoon (Torrent et al., 2006; Yin et al., 2018; Zhao et al., 2017b).…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Identifying Temperature and Moisture Controls on Fe Oxide Origins

Lepre

2023

Geophysical Research Letters

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Magnetism, redness, and Fe oxides are indicators of pedoclimatic conditions. However, uncertainties with observing how Fe oxides form within soils has led to debates about relationships between magnetic mineral assemblages, temperature, and rainfall. To address these issues, Fe oxides from the equatorial tropics of Kenya were examined in Pliocene soils that developed under orbital forcing of the monsoon. Results demonstrate that with warm‐wet monsoons, ferrimagnetic production was increased and correlated with hematite concentrations, in accordance with expectations that ferrimagnetic and hematite minerals codevelop from amorphous Fe oxides. With cool‐dry monsoons, hematite concentrations increased but ferrimagnetic production decreased and decoupled from hematite development. These findings suggest that decreased rainfall rather than temperature change favored the dehydration step required to catalyze hematite enrichment within soils. This study explains Fe oxides origins under variable monsoonal climates and recognizes moisture changes in comparison to temperature as stronger controls on the production of soil‐formed hematite.

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Late Holocene change in South Asian monsoons and their influences on human activities in the southern Tibetan Plateau

Cheng

Yang

Long

et al. 2023

CATENA

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Differentiating detrital and pedogenic contributions to the magnetic properties of aeolian deposits in the southern Tibetan Plateau: Implications for paleoclimatic reconstruction

Cited by 13 publications

References 68 publications

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Changes in Late Pleistocene Dust Activity in the Southern Tibetan Plateau in Response to Orbital Precession and Mountain Glaciers

Identifying Temperature and Moisture Controls on Fe Oxide Origins

Late Holocene change in South Asian monsoons and their influences on human activities in the southern Tibetan Plateau

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