Geochemical Evaluation of Rare Earth Elements Using Step Factor Analysis and Fractal Modeling in Qalikouh Oil Shale in Western Iran

Document Type : Research - Paper

Authors

1 Ph.D Student, Dept. of Earth Sciences, Shahid Beheshti University, Tehran, Iran

2 Professor, Dept. of Earth Sciences, Shahid Beheshti University, Tehran, Iran

3 M.Sc, Dept. of Geochemistry, Exploration Directorate, National Iranian Oil Company, Iran

Abstract

Qalikouh area is located 35 km southwest of Aligudarz city, Lorestan province, SW of Iran. The area is located in the central part of the Zagros Geological Zone. The oil shales of the area are located in the Upper Triassic and Lower Jurassic of Sargalu and Garau Formations. The Sargalu Formation contains a series of shale, carbonate and clays. Garau Formation includes oil shale horizons with different thicknesses, ammonite shales and black cherty layer. In order to investigate the enrichment ratio and relationship between elements and organic matter, 53 samples of oil shale from Garau and Sargalu formations were selected. The samples were analyzed by XRD, XRF, ICP-MS and Rock-Eval analyzer. Data processing was performed using factor analysis, fractal modeling, stepwise factor analysis and principal component analysis. The data show that Sargalu Formation with average TOC = 13.27% and Garau Formation with average TOC = 18.13%, have high content of organic matter in central and NW of the area. Cconcentration-number fractal modeling showed that the Co, Mo, Ni, Pb and U have significant anomalies. The stepwise factor analysis (SFA) method showed a significant correlation between the anomalous elements and TOC. Geochemical maps showed that the anomalies are located for Co and Pb in the center and SE, for Mo, Ni in the NW and center, for V and REE in the NW, and for U in central part of the area.

Keywords

References

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History

  • Receive Date: 25 January 2021
  • Revise Date: 24 April 2021
  • Accept Date: 24 April 2021

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