Magnetic susceptibility of surface soils in the Mu Us Desert and its environmental significance

Liu, Xiaokang; Lu, Ruijie; Lü, Zhiqiang; Du, Jing; Jia, Feifei; Li, Tengfei; Chen, Lu; Wu, Yue

doi:10.1016/j.aeolia.2017.04.003

Cited by 30 publications

(13 citation statements)

References 47 publications

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“…Pan et al [2000] reported that siderite could be transformed to ferromagnetic phases at temperatures of 400-5308C, into magnetite at temperatures of 540-5908C, and into hematite at a temperature of 7008C. Liu and Deng [2009] reported that the neoformation of SD magnetite begins to occur above 4008C, and most of the neoformed fine-grained (SP 1 SD) particles with a dominant grain size around 35 nm are produced above 5008C. Rock-magnetic studies indicate that siderite and pyrite were transformed into magnetite and pyrrhotite at >4008C-5008C during the Taiwan Chi-Chi earthquake [Tanikawa et al, 2008;Chou et al, 2012b].…”

Section: Rock-magnetic Response To Large Earthquakesmentioning

confidence: 99%

Rock record and magnetic response to large earthquakes within Wenchuan Earthquake Fault Scientific Drilling cores

Zhang

Sun

et al. 2017

Geochem Geophys Geosyst

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Fault‐related pseudotachylytes are often considered to be produced by large seismic events. To investigate the rock record and magnetic response to large earthquakes within cores from the Wenchuan Earthquake Fault Scientific Drilling borehole 2 (WFSD‐2), we carried out microstructural, geochemical, and rock‐magnetic analyses of representative cores. Based on microstructural observations and powder X‐ray diffraction analyses, we found 21 layers of melt‐origin pseudotachylytes from 579.62 to 599.31 m‐depth in the cores. The presence of early‐formed pseudotachylyte fragments in the new layer suggests that seismic faulting processes exploited the same fault strand more than once. Pseudotachylyte veins have higher values of magnetic susceptibility relative to wall rocks. Rock‐magnetic results indicate that the magnetic minerals within the pseudotachylyte veins are magnetite with varying amounts of paramagnetic minerals. Magnetic hysteresis loops show that a reduction of the grain size of ferromagnetic minerals is not a plausible explanation for the higher magnetic susceptibility values in pseudotachylyte veins. Rock‐magnetic analyses indicate that frictional heating (>500°C) occurred in the pseudotachylyte veins during large earthquakes. The resulting high temperatures induced thermal decomposition of paramagnetic minerals, forming magnetite and contributing to the higher magnetic susceptibility values. Different generations of pseudotachylytes and numerous high magnetic susceptibility zones together demonstrate that ancient powerful earthquakes may have occurred repeatedly in the Longmen Shan thrust belt.

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Section: Rock-magnetic Response To Large Earthquakesmentioning

confidence: 99%

Rock record and magnetic response to large earthquakes within Wenchuan Earthquake Fault Scientific Drilling cores

Zhang

Sun

et al. 2017

Geochem Geophys Geosyst

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“…The soils are extremely barren with a relatively low organic matter content (1.75 g/kg) and plant nutrients with poor wind erosion resistance. Natural vegetation belongs to a transition type of desert steppe and forest steppe, which is a typical ecoenvironmental fragile region in northwest China (Liu et al 2017). The main vegetations include arbors, shrubs, and herbs that are restored on shifting sandy land in different periods, which are mainly Pinus sylvestris var.…”

Section: Study Areamentioning

confidence: 99%

Long‐term vegetation restoration increases carbon sequestration of different soil particles in a semi‐arid desert

et al. 2021

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“…We chose the Mu Us Desert as the research area which lies on 106 • 50 -111 • 30 E longitude and 37 • 61 -40 • 22 N latitude and covers approximately 4 × 10 4 km 2 (Figure 1). It is located in the transitional zone of arid and semi-arid, most of which belong to the continental monsoon climate [28], with an average annual temperature of 6.0-8.5°C. The average annual precipitation is 250-440 mm, of which more than 60% occurs in summer.…”

Section: Situation Of the Research Areamentioning

confidence: 99%

The Vegetation Dynamics and Climate Change Responses by Leaf Area Index in the Mu Us Desert

et al. 2019

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Knowing the long-dated dynamic changes of vegetation in the Mu Us Desert is critical for strengthening sustainable management of vegetation restoration projects in the next planned cycle until 2050. To predict leaf area indexes (LAIs) under long-dated climate scenarios in the Mu Us Desert, the relationship between earlier meteorological data and LAI was tracked with regression analysis on the basis of LAI data from the Global Land Surface Satellite (GLASS) and the grid meteorological data during 1982-2012, and the LAIs were estimated based on five-Global Circulation Model (GCM) ensemble means under three representative concentration pathways (RCP 2.6, RCP 4.5 and RCP 8.5). We found an increasing trend in precipitation and a significant increase in potential evapotranspiration (PET) during the earlier period in the Mu Us Desert, and that could continue into the long-dated under three RCPs in the Mu Us Desert. Warming trends occur in the earlier and long-dated periods for annual average air temperature. Compared with the observations, the temperature rises respectively by 0.6°C, 0.7°C, and 1°C under the three RCPs mentioned above. The annual maximum LAI largely increased with a rate-of-change of 0.029 m 2 ·m −2 ·yr -1 . Precipitation has been a major influencing factor to vegetation dynamics and growth in the Mu Us Desert. The permissible LAIs by 2050 are 0.42-0.88 m 2 ·m −2 , 0.42-0.87 m 2 ·m −2 , and 0.41-0.87 m 2 ·m −2 under the three RCPs, respectively. Contrasted with the baseline period , the LAI is found to be already close to the current value in the northwestern and southern Mu Us Desert.

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Magnetic susceptibility of surface soils in the Mu Us Desert and its environmental significance

Cited by 30 publications

References 47 publications

Rock record and magnetic response to large earthquakes within Wenchuan Earthquake Fault Scientific Drilling cores

Rock record and magnetic response to large earthquakes within Wenchuan Earthquake Fault Scientific Drilling cores

Long‐term vegetation restoration increases carbon sequestration of different soil particles in a semi‐arid desert

The Vegetation Dynamics and Climate Change Responses by Leaf Area Index in the Mu Us Desert

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