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Lithology and mineralogy recognition from geochemical logging tool data using multivariate statistical analysis.

Ahmed Amara Konaté1, Huolin Ma2, Heping Pan2

  • 1Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Lumo Road 388, 430074 Wuhan, Hubei, China; Institut Supérieur des Mines et Géologie de Boké, BP: 84 Boké, Guinea.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
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Summary

Geochemical logging of oxide data from a deep well provides insights into Ultra High Pressure (UHP) metamorphic rocks. This method accurately characterizes lithology and mineralogy, proving useful for UHP rock analysis.

Keywords:
CCSD-MHGeochemical logLithologyMetamorphic rockMineralogy

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Area of Science:

  • Geochemistry
  • Metamorphic Petrology
  • Geophysical Well Logging

Background:

  • Deep wells penetrating Ultra High Pressure (UHP) metamorphic rocks are rare, limiting direct study.
  • The Chinese Continental Scientific Drilling Main hole in the Sulu UHP metamorphic belt offers a unique research opportunity.

Purpose of the Study:

  • To analyze oxide log data from a deep borehole in UHP metamorphic rocks.
  • To evaluate the utility of geochemical logging tools for characterizing these rocks.

Main Methods:

  • In situ geochemical logging using gamma ray spectroscopy to measure major and trace elements.
  • Analysis of dry weight percent oxide concentrations (SiO2, K2O, TiO2, H2O, CO2, Na2O, Fe2O3, FeO, CaO, MnO, MgO, P2O5, Al2O3).
  • Application of Cross plot and Principal Component Analysis for lithology and mineralogy description.

Main Results:

  • Cross plot analysis successfully characterized lithological variations.
  • Principal Component Analysis revealed two main components related to feldspar and hydrous minerals.
  • Geochemical logging data demonstrated accuracy and adequacy for UHP metamorphic rock analysis.

Conclusions:

  • Geochemical logging tools are highly effective for analyzing UHP metamorphic rocks.
  • The study validates the use of oxide log data for detailed lithological and mineralogical interpretation.
  • This approach offers a valuable method for investigating unique geological formations like those in the Sulu UHP belt.