Journal of Earth Science

, Volume 25, Issue 3, pp 495–505 | Cite as

Formation of a hydrothermal kaolinite deposit from rhyolitic tuff in Jiangxi, China

  • Ye Yuan
  • Guanghai Shi
  • Mengchu Yang
  • Yinuo Wu
  • Zhaochong Zhang
  • Anjie Huang
  • Jiajing Zhang


The Longmen kaolinite deposit is one of the largest hydrothermal clay deposits of Ganxi volcanic basin (northern Wuyi Mountain area, China). The pristine host rocks are rhyolitic crystal-vitric tuff and minor lapilli tuff from the Late Jurassic Ehuling Formation. The ore consists of kaolin-group minerals (kaolinite, dickite), pyrophyllite with minor quartz, sericite, pyrite, etc.. From the host rocks to the transition zones (altered rocks) then to the vein ores, contents of SiO2 and TFe2O3 decrease, whereas Al2O3 and LOI increase, consistent with the contents increase of kaolin minerals and pyrophyllite in the samples. The total REE abundances of the ores are much lower than that of the host and altered rocks, Rb, Nb, Nd, Zr, Ti and Y are significantly depleted. Apparent zoning features of bulk geochemistry and mineral component reflect that the kaolinite deposit occurred at the expense of the host rock by ascending hydrothermal fluids with distinct removal of SiO2, TFe2O3, Na2O, K2O. According to the mineral assemblage, the formation temperature of this deposit falls within the range of 270–350 °C. With regard to the industrial applications, the kaolinized ores are suitable for use in ceramics and gemologic materials crafted for seal stones. Moreover, in mineralogical terms, this deposit is also proved to be an excellent example for studying channeled hydrothermal alterations of rhyolitic tuff.

Key Words

China geochemistry hydrothermal alteration Jiangxi kaolinite pyrophyllite 


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Copyright information

© China University of Geosciences and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Ye Yuan
    • 1
    • 2
  • Guanghai Shi
    • 1
  • Mengchu Yang
    • 1
  • Yinuo Wu
    • 1
  • Zhaochong Zhang
    • 1
  • Anjie Huang
    • 3
  • Jiajing Zhang
    • 2
  1. 1.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijingChina
  2. 2.Geological Survey of Jiangxi ProvinceNanchangChina
  3. 3.Northeast Geological department of Jiangxi Geological Exploration BureauShangraoChina

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