Magnetostratigraphy and paleoclimatic interpretation of a continuous 7.2 Ma Late Cenozoic Eolian sediments from the Chinese Loess Plateau

Sun, Deqiang; Shaw, John; An, Zhisheng; Cheng, Mengchun; Yue, Leping

doi:10.1029/97gl03353

Cited by 255 publications

(139 citation statements)

References 10 publications

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“…Climate model runs (e.g., [11][12][13][14][15] suggest that the uplift of the Tibetan Plateau alone would be enough to establish considerable drying of Central Asia and monsoon circulation in East Asia. The modeled results closely resemble the environmental changes that are observed around 7-8 Ma in South and East Asia (e.g., 5,[16][17][18][19][20][21][22].…”

supporting

confidence: 61%

Distribution history and climatic controls of the Late Miocene Pikermian chronofauna

Eronen¹,

Ataabadi²,

Micheels

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

163

111

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The Late Miocene development of faunas and environments in western Eurasia is well known, but the climatic and environmental processes that controlled its details are incompletely understood. Here we map the rise and fall of the classic Pikermian fossil mammal chronofauna between 12 and 4.2 Ma, using genus-level faunal similarity between localities. To directly relate land mammal community evolution to environmental change, we use the hypsodonty paleoprecipitation proxy and paleoclimate modeling. fossil mammals ͉ paleoclimate ͉ Pikermi ͉ similarity index

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supporting

confidence: 61%

Distribution history and climatic controls of the Late Miocene Pikermian chronofauna

Eronen¹,

Ataabadi²,

Micheels

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

163

111

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“…As one of excellent paleoenvironmental archives, Chinese loess fully and accurately recorded the historical alternation of the predominant periods of the East Asia winter monsoon and summer monsoon during the past 2.6 Ma with Quaternary loess-paleosol cycles [27]. The discovery and research of the Neogene eolian red clay underlying the Quaternary loess further broadened the record of the East Asian monsoon evolution on a long timescale [4,27,30,31]. It was generally believed that marine sediments of the Arabian Sea and Indian Ocean and continental sediments of the South Asian subcontinent [29] better recorded the evolution of the South Asian monsoon during geological period, but recently different views and new explanations [32] were proposed for the records of upwelling in the Arabian Sea [21] and paleovegetation changes in South Asia [20].…”

Section: Geological Recordsmentioning

confidence: 99%

Influence of the Tibetan Plateau uplift on the Asian monsoon-arid environment evolution

2013

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As one of the most important geological events in Cenozoic era, the uplift of the Tibetan Plateau (TP) has had profound influences on the Asian and global climate and environment evolution. During the past four decades, many scholars from China and abroad have studied climatic and environmental effects of the TP uplift by using a variety of geological records and paleoclimate numerical simulations. The existing research results enrich our understanding of the mechanisms of Asian monsoon changes and interior aridification, but so far there are still a lot of issues that need to be thought deeply and investigated further. This paper attempts to review the research on the influence of the TP uplift on the Asian monsoon-arid environment, summarize three types of numerical simulations including bulk-plateau uplift, phased uplift and sub-regional uplift, and especially to analyze regional differences in responses of climate and environment to different forms of tectonic uplifts. From previous modeling results, the land-sea distribution and the Himalayan uplift may have a large effect in the establishment and development of the South Asian monsoon. However, the formation and evolution of the monsoon in northern East Asia, the intensified dryness north of the TP and enhanced Asian dust cycle may be more closely related to the uplift of the main body, especially the northern part of the TP. In this review, we also discuss relative roles of the TP uplift and other impact factors, origins of the South Asian monsoon and East Asian monsoon, feedback effects and nonlinear responses of climatic and environmental changes to the plateau uplift. Finally, we make comparisons between numerical simulations and geological records, discuss their uncertainties, and highlight some problems worthy of further studying.Tibetan Plateau, tectonic uplift, Asian monsoon, inland aridity, environmental evolution, geological record, numerical simulation Citation:Liu X D, Dong B W.

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“…Clay sequences at Lingtai and Pingliang have also been studied (Ding et al, 1998a;Sun et al, 1998). The magnetostratigraphic polarity zonation of the Chinese Loess Plateau is therefore well established for the last 2.6 Ma for loess sequences and for…”

Section: Magnetostratigraphy and Geomagnetism Of Chinese Loessmentioning

confidence: 99%

How does Chinese loess become magnetized?

Zhao

Roberts

2010

Earth and Planetary Science Letters

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Thick loess deposits on the Chinese Loess Plateau provide an outstanding archive of paleoclimate, geomagnetic field and paleoenvironmental changes over at least the last 2.6 Ma. Much work on magnetic polarity reversals, pedogenic magnetic enhancement and climatic change has been carried out over the past 30 years. However, questions about how Chinese loess becomes magnetized remain unanswered. In this thesis, I have sought to address key questions concerning magnetization processes in the Chinese loess. To understand magnetization processes, it is important to understand which magnetic minerals are present and the processes that caused them to be present. Magnetic and other analyses of both loess and paleosol samples indicate that pedogenic superparamagnetic and single domain magnetite and hematite can be present. The mass concentration of hematite can exceed 90% of the magnetic particle assemblage. An eolian dust deposition simulator designed for laboratory redeposition experiments was then used to demonstrate that both a depositional remanent magnetization (DRM) and a post-depositional remanent magnetization (PDRM) can be acquired by Chinese loess. Water content significantly affects the efficiency of PDRM acquisition. No significant PDRM was observed when the water content was below a critical threshold of 40%. Published paleomagnetic data from the Chinese loess indicate the widespread occurrence of inclination error. Detailed paleomagnetic studies of U-channel samples from the last loess/paleosol sequence at Yuanbao were made to assess whether the Chinese loess can accurately record geomagnetic relative paleointensity variations. Three normalized remanence records were determined using conventional normalization as well as the pseudo-Thellier method. Strong coherence among the normalized remanence records indicate that the whole range of magnetic minerals has been affected by pedogenesis. Poor similarity among published normalized remanence records from the Chinese loess, as well as with marine relative paleointensity records indicate that the Chinese loess is not suitable for relative paleointensity determinations. The range of magnetic minerals present and their varying distribution within loess and paleosol sediments indicate that the magnetization is due to a mixture of remanence acquisition mechanisms including DRM, PDRM, chemical remanent magnetization (CRM) and viscous remanent magnetizations, which also indicates complexities in remanence acquisition that will complicate attempts to extract relative paleointensity information. This thesis has provided an improved understanding of the mechanisms of Chinese loess magnetization, and re-emphasizes the importance of pedogenic CRM acquisition.

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Magnetostratigraphy and paleoclimatic interpretation of a continuous 7.2 Ma Late Cenozoic Eolian sediments from the Chinese Loess Plateau

Cited by 255 publications

References 10 publications

Distribution history and climatic controls of the Late Miocene Pikermian chronofauna

Distribution history and climatic controls of the Late Miocene Pikermian chronofauna

Influence of the Tibetan Plateau uplift on the Asian monsoon-arid environment evolution

How does Chinese loess become magnetized?

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