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Hu, Pengxiang; Liu, Qingsong; Heslop, David; Roberts, Andrew P; Jin, Chunsheng (2015): Magnetic and mineralogical analyses of Ganzi and Luochuan sections [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.836298, Supplement to: Hu, P et al. (2015): Soil moisture balance and magnetic enhancement in loess–paleosol sequences from the Tibetan Plateau and Chinese Loess Plateau. Earth and Planetary Science Letters, 409, 120-132, https://doi.org/10.1016/j.epsl.2014.10.035

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DOI registered: 2014-11-07 • Published: 2015 (exact date unknown)

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Abstract:
We present a first combined environmental magnetic and geochemical investigation of a loess-paleosol sequence (<55 ka) from the Chuanxi Plateau on the eastern margin of the Tibetan Plateau. Detailed comparison between the Ganzi section and the Luochuan section from the Chinese Loess Plateau (CLP) allows quantification of the effects of provenance and climate on pedogenic magnetic enhancement in Chinese loess. Rare earth element patterns and clay mineral compositions indicate that the Ganzi loess originates from the interior of the Tibetan Plateau. The different Ganzi and CLP loess provenances add complexity to interpretation of magnetic parameters in terms of the concentration and grain size of eolian magnetic minerals. Enhanced paleosol magnetism via pedogenic formation of ferrimagnetic nanoparticles is observed in both sections, but weaker ferrimagnetic contributions, finer superparamagnetic (SP) particles and stronger chemical weathering are found in the Ganzi loess, which indicates the action of multiple pedogenic processes that are dominated by the combined effects of mean annual precipitation (MAP), potential evapotranspiration (PET), organic matter and aluminium content. Under relatively high MAP and low PET conditions, high soil moisture favours transformation of ferrimagnetic minerals to hematite, which results in a relatively higher concentration of hematite but weaker ferrimagnetism of Ganzi loess. Initial growth of superparamagnetic (SP) particles is also documented in the incipient loess at Ganzi, which directly reflects the dynamic formation of nano-sized pedogenic ferrimagnets. A humid pedogenic environment with more organic matter and higher Al content also helps to form finer SP particles. We therefore propose that soil water balance, rather than solely rainfall, dominates the type, concentration and grain size of secondary ferrimagnetic minerals produced by pedogenesis.
Coverage:
Median Latitude: 33.468837 * Median Longitude: 104.374133 * South-bound Latitude: 31.516570 * West-bound Longitude: 99.976500 * North-bound Latitude: 35.700000 * East-bound Longitude: 109.400000
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
15 datasets

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Datasets listed in this publication series

  1. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 2) CIA and Fe2/Fe3 ratio in Ganzi_loess_section samples. https://doi.org/10.1594/PANGAEA.836279
  2. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 2) Hematite and Goethite in Ganzi_loess_section samples. https://doi.org/10.1594/PANGAEA.836278
  3. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 2) Magnetic parameters of Ganzi_loess_section samples. https://doi.org/10.1594/PANGAEA.836276
  4. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 2) Magnetic parameters after CBD of Ganzi_loess_section samples. https://doi.org/10.1594/PANGAEA.836277
  5. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 4) Raw data of XRD measurements of Ganzi_loess_section samples, KCLH. https://doi.org/10.1594/PANGAEA.836289
  6. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 4) Raw data of XRD measurements of Ganzi_loess_section samples, MGCK2G. https://doi.org/10.1594/PANGAEA.836290
  7. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 4) Raw data of XRD measurements of Ganzi_loess_section samples, nature. https://doi.org/10.1594/PANGAEA.836291
  8. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figures 1, 6, 7) Original FORC data and original AC data. https://doi.org/10.1594/PANGAEA.836297
  9. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 8) Months rainfall at Ganzi and Luochuan sample locations. https://doi.org/10.1594/PANGAEA.836295
  10. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 3) CIA and Fe2/Fe3 ratio in Luochuan samples. https://doi.org/10.1594/PANGAEA.836282
  11. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 3) Hematite and Goethite in Luochuan samples. https://doi.org/10.1594/PANGAEA.836281
  12. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 3) Magnetic parameters of Luochuan samples. https://doi.org/10.1594/PANGAEA.836280
  13. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 4) Raw data of XRD measurements of Luochuan samples, KCLH. https://doi.org/10.1594/PANGAEA.836292
  14. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 4) Raw data of XRD measurements of Luochuan samples, MGCL2G. https://doi.org/10.1594/PANGAEA.836293
  15. Hu, P; Liu, Q; Heslop, D et al. (2015): (Figure 4) Raw data of XRD measurements of Luochuan samples, nature. https://doi.org/10.1594/PANGAEA.836294