Preprints
https://doi.org/10.5194/egusphere-2023-1528
https://doi.org/10.5194/egusphere-2023-1528
31 Jul 2023
 | 31 Jul 2023

Geochemical characterisation and protolith restoration of metamorphic rocks at Lazishao graphite mine, Sichuan

Wenqi Cheng, Haijun Yu, Xue Wang, Decai Kong, and Bo Long

Abstract. This study determined the deposit characteristics and geochemical features of metamorphic rocks from the Lazishao graphite deposit in order to reconstruct the metamorphic protoliths and palaeo-sedimentary environment. The results show that the SiO2 content of the metamorphic rocks is high (55.60 % to 77.94 %), while Na2O is 0.22 % to 1.85 %, K2O is 1.87 % to 3.45 %, K2O > Na2O, and K2O/Na2O + K2O > 0.5. The fractionation degree of light rare earth elements (LREEs) is greater than that of heavy rare earth elements (HREEs), with LREE/HREE ratios of 3.09 to 8.77; LaN/YbN is 2.72 to 10.75, with a mean value of 9.69. The rocks have moderate negative Eu anomalies (δEu = 0.50 to 0.89, mean = 0.64). Ionic lithophile elements (e.g., Rb, Ba, and K) are relatively enriched, but Sr is relatively depleted. The graphite-bearing metamorphic rocks in the study area originated from sedimentary rocks, mainly mudstone and greywacke. The palaeo-sedimentary environment was a low-salinity terrestrial freshwater body in a cold or moderately cold climatic zone.

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Wenqi Cheng, Haijun Yu, Xue Wang, Decai Kong, and Bo Long

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1528', Anonymous Referee #1, 30 Aug 2023
    • CC1: 'Reply on RC1', Haijun Yu, 26 Sep 2023
      • AC1: 'Reply on CC1', Haijun Yu, 26 Sep 2023
    • AC2: 'Reply on RC1', Haijun Yu, 23 Oct 2023
  • RC2: 'Comment on egusphere-2023-1528', Anonymous Referee #2, 07 Oct 2023
    • AC3: 'Reply on RC2', Haijun Yu, 23 Oct 2023

Status: closed (peer review stopped)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-1528', Anonymous Referee #1, 30 Aug 2023
    • CC1: 'Reply on RC1', Haijun Yu, 26 Sep 2023
      • AC1: 'Reply on CC1', Haijun Yu, 26 Sep 2023
    • AC2: 'Reply on RC1', Haijun Yu, 23 Oct 2023
  • RC2: 'Comment on egusphere-2023-1528', Anonymous Referee #2, 07 Oct 2023
    • AC3: 'Reply on RC2', Haijun Yu, 23 Oct 2023
Wenqi Cheng, Haijun Yu, Xue Wang, Decai Kong, and Bo Long
Wenqi Cheng, Haijun Yu, Xue Wang, Decai Kong, and Bo Long

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Short summary
Lithogeochemical analysis shows that the metamorphic protoliths of the graphite deposit were sedimentary rocks whose lithology was dominated by carbonaceous claystone and greywacke. The palaeo-sedimentary environment was a low-salinity terrestrial freshwater body in a cold or moderately cold climatic zone. Sediments were sourced from the upper crust, and the main provenance components were argillaceous rock and sandstone from a felsic–intermediate source area.