Geomagnetic episodes of the last 1.2 Myr recorded in Chinese loess

Pan, Yongxin; Zhu, Rixiang; Liu, Q. S.; Guo, Bin; Yue, Leping; Wu, Hanning

doi:10.1029/2001gl014024

Cited by 69 publications

(111 citation statements)

References 23 publications

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“…The basal age is estimated to be about 1.0 Ma through extrapolation of the average sedimentation rate during the Brunhes (Zeng et al, 2011). Many paleomagnetic investigations on the CLP have indicated that the B/M and TJS are generally located around L8-S8 and L10-S10, respectively (Guo et al, 2002a;Kukla and An, 1989;Liu et al, 1986;Pan et al, 2002;Wang et al, 2006;Zhu et al, 1994). These discrepancies in the positions of the geomagnetic reversal boundaries among Chinese loess sections has been primarily attributed to local variations in sediment accumulation rate and pedogenesis causing varying degrees of directional smoothing; loss of resolution due to non-continuous sampling strategies; and dissimilar demagnetization/analytical techniques used in different studies (Wang et al, 2006).…”

Section: Pedostratigraphic Analysis Of the Nyzg Sectionmentioning

confidence: 99%

Long-term Pleistocene aridification and possible linkage to high-latitude forcing: New evidence from grain size and magnetic susceptibility proxies from loess-paleosol record in northeastern China

Zeng

et al. 2017

CATENA

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Loess deposits are regarded as good indicators of the inception and development of arid and semi-arid climate in central Asia and northern China during the late Cenozoic. In northeastern China extensive loess deposits are found surrounding the Horqin and Otindag sand fields, and they have great potential for reconstructing the long-term aridification history of the region. However, these loess deposits are currently poorly understood.Here, we present a high-resolution magnetic susceptibility (MS) and grain-size record spanning the last 1.0 Ma from a 36.6-m-thick loess-paleosol sequence at Niuyangzigou site (NYZG) in NE China. The grain-size record reveals a long-term drying trend in NE China since ca. 1.0 Ma, punctuated by two significant abrupt drying events at~0.65 Ma and~0.3 Ma. These results demonstrate a process of stepwise intensification of drying in NE China over the past 1 Ma, and lend support to the hypothesis that global ice volume/temperature changes were the major driver of the long-term aridification of Asian dust source areas. However, unlike the widely studied loess deposits on the central Chinese Loess Plateau (CLP), the MS record in paleosol units S1, S2 and S4 from the NYZG site do not show evidence of enhanced monsoon precipitation resulting from decreased global ice volume and the prolonged episodes of interglaciation after the Mid-Pleistocene Transition evident in the ice volume record. We hypothesize that this may be due to differences in the climatic sensitivity of the MS of Chinese loess deposits on a regional scale, rather than to in regional differences in monsoon intensity.

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Section: Pedostratigraphic Analysis Of the Nyzg Sectionmentioning

confidence: 99%

Long-term Pleistocene aridification and possible linkage to high-latitude forcing: New evidence from grain size and magnetic susceptibility proxies from loess-paleosol record in northeastern China

Zeng

et al. 2017

CATENA

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“…The nearly continuous loesspaleosol sediments provide the most continuous terrestrial paleoclimatic and magnetostratigraphic records for the last 2.6 Myr (e.g., Evans and Heller, 2001). Recently, several researchers have continued investigations on the underlying red clay Ding et al, 1998Ding et al, , 2001Qiang et al, 2001;Guo et al, 2002), and the initiation of aeolian dust deposition has been extended back to more than 22 Ma, marking the onset of the present-day East Asian monsoon system (Guo et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Early and middle Matuyama geomagnetic excursions recorded in the Chinese loess-paleosol sediments

et al. 2007

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A detailed paleomagnetic and rock-magnetic investigation on the early and middle Matuyama loess-paleosol sediments has been carried out at the Baoji section, Shaanxi province, southern Chinese Loess Plateau. Our new magnetostatigraphy revises the position of the lower Olduvai boundary from L27 to S26. Seven shortlived geomagnetic excursions, tentatively named as E1, E2, E3, E4, E5, E6, and E7, have been recognized in the L13, S22, L26, L27, S29, and upper and middle parts of L32, respectively. Results of the anisotropy of low-field magnetic susceptibility (AMS) show that the studied loess-paleosol sediments retain the primary sedimentary fabric. Rock magnetic experiments reveal that the sediments from the excursional and polarity transitional intervals have the same magnetic characteristics as those from the surrounding normal and reversed polarity intervals. Assuming a constant accumulation rate between polarity boundaries, these seven excursions are estimated to be at about 1.11 Ma (E1), 1.58 Ma (E2), 1.92 Ma (E3), 2.11 Ma (E4), 2.25 Ma (E5), 2.35 Ma (E6), and 2.42 Ma (E7) Ma. The E1 and E2 in the middle Matuyama Chron can be correlated with the Punaruu and Stage 54 (Gilsa) excursions, respectively. The E4, E5, and E7 in the early Matuyama Chron can be correlated with the Réunion II, Réunion I, and cryptochron C2r.2r-1 (X-subchron), respectively. The E3 in the lower Olduvai subchron and E6 in the early Matuyama Chron have no comparable events. At present they can only be correlated with the anomalous directions observed in the Osaka Bay core (Biswas et al., 1999). Therefore, further investigations are necessary to support their global occurrences. The present result together with the two late Matuyama excursions dated at about 0.89 Ma and 0.92 Ma (Yang et al., 2004) show that the Baoji section yields at least nine Matuyama excursions which, along with the results of the study, suggests that eight excursions occur at 0.9-2.2 Ma (Channell et al., 2002), thereby providing evidence that the short-lived geomagnetic excursions may also be a basic characteristic of the geomagnetic field during the Matuyama Chron.

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“…A recent paleomagnetic study from the Baoji loess section defined the TJ at the top of L10 (Yang et al 2004), which is in agreement with previous studies in the same area (Rutter et al 1990). The TJ was also placed in L10 from the loess sections of Weinan at the southern CLP (Zhu et al 1994;Pan et al 2002), and Xifeng in the central CLP , and close to the stratigraphy boundary of the L10/S9 in the section of Jingbian at the northern CLP . Meanwhile, a series of studies from other loess sections, such as Luochuan in the central CLP (Heller and Liu 1984;Kukla and An 1989;Liu et al 2010), Duanjiapo at the southern CLP (Zheng et al 1992), and Sanmenxia at the southeastern CLP (Wang et al 2005(Wang et al , 2006 defined the final position of the TJ in the paleosol unit of S10.…”

Section: Discussionmentioning

confidence: 99%

“…However, details of this reversal are poorly understood. Previous paleomagnetic studies on various loess sections from across the CLP indicate the termination of the Jaramillo subchron (TJ) is located between the bottom of unit S9 and the middle-upper part of S10 (Heller and Liu 1984;Liu et al 1988;Zheng et al 1992;Zhu et al 1994;Guo et al 2002;Pan et al 2002;Yang et al 2004;Wang et al 2005;Liu et al 2010). Uncertainties in age determinations of aeolian sequences in the CLP make it difficult to accurately link the deposition to other long-term geological archives, such as deep-sea and lacustrine sediments.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, numerous studies have focused on the exact identification and/or detailed processes of geomagnetic reversals (Heller and Liu 1982;Sun et al 1993;Zhu et al 1994;Spassov et al 2001Spassov et al , 2003Pan et al 2002;Liu et al 2008;Yang et al 2005Yang et al , 2014Liu 2010, 2011b;Wang et al 2014;Zhao et al 2014;Zhou et al 2014) and excursions (Zhu et al 1998Fang et al 1997;Pan et al 2002;Yang et al 2004Yang et al , 2007aYang et al , 2007bYang et al , 2008Jin et al 2012;Sun et al 2013) recorded in Chinese loess.…”

Section: Introductionmentioning

confidence: 99%

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A sedimentary paleomagnetic record of the upper Jaramillo transition from the Lantian Basin in China

Ouyang

Qiu

et al. 2015

Earth Planet Sp

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The termination of the Jaramillo (normal to reverse) subchron is a key chronostratigraphic marker for dating global Pleistocene sedimentary sequences. However, the stratigraphic position of the geomagnetic polarity reversal varies greatly across the Chinese Loess Plateau (CLP), from near the bottom of paleosol unit S9 to the middle-upper part of S10. Here, we present paleomagnetic and rock magnetic results from high-resolution sampling of the Yushan loess section of the Lantian Basin located within the southern CLP. Our combined analyses determine that the polarity reversal is located in the middle-lower part of the paleosol unit S10. This stratigraphic position is lower than most of other studies conducted throughout the CLP. We attribute the difference in the location of the reversal to a deeper lock-in depth of remanence acquisition, which may have occurred from postdepositional processes under favorable hydrothermal conditions along the southern margin of CLP. It is important to note that age determinations through magnetic stratigraphy on sedimentary sections, particularly in discontinuous and/or imperfect sequences, should be treated with caution; there are significant differences with respect to the location of the polarity reversal throughout the CLP.

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Geomagnetic episodes of the last 1.2 Myr recorded in Chinese loess

Cited by 69 publications

References 23 publications

Long-term Pleistocene aridification and possible linkage to high-latitude forcing: New evidence from grain size and magnetic susceptibility proxies from loess-paleosol record in northeastern China

Long-term Pleistocene aridification and possible linkage to high-latitude forcing: New evidence from grain size and magnetic susceptibility proxies from loess-paleosol record in northeastern China

Early and middle Matuyama geomagnetic excursions recorded in the Chinese loess-paleosol sediments

A sedimentary paleomagnetic record of the upper Jaramillo transition from the Lantian Basin in China

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