Mineralogy, Geochemistry and the Origin of the Bagoushi Karst Bauxite Deposit, Northwestern Fars Province, Iran

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ZAMANIAN H.; Beiranvand g.; Ahmadnejad f.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:112 Page(s): 269-280

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Information Journal Paper

Title

Mineralogy, Geochemistry and the Origin of the Bagoushi Karst Bauxite Deposit, Northwestern Fars Province, Iran

Author(s)

ZAMANIAN H. | Beiranvand g. | Ahmadnejad f. | Issue Writer Certificate

Keywords

BauxiteQ2

KarstQ2

BagoushiQ1

GeochemistryQ1

Rare Earth ElementQ2

Abstract

Bagoushi deposit is located at 37 km northwest of Masiri in Fars province. Structurally, the deposit is situated in the Zagros Simply Folded belt and developed in Upper Cretaceous carbonates. From the bottom to top, the deposit is consisted of kaolinitic, brecciated, brown, pisolitic and red Bauxite horizons. Boehmite, kaolinite, hematite, pyrophyllite, anatase, calcite and diaspore are the major mineral phases. The main ore textures of the deposit include pisolitic, pisolitic-oolitic and clastic with pelitomorphic and microgranular matrixes. Some textural features such as pelitomorphic matrix, pisolitic and oolitic textures, radial fractures in pisoids, growth of simple cortex around earlier pisoids, pisoids with cortexes lacking radial and circular fractures, are indicative of autochthonous origin; and broken pisoids, allogeneic pisoids and clastic grains reveal the transportation of bauxitic materials; therefore the Bauxite materials is authigenic, but in some parts were transported and re-deposited, at least locally. The mass change calculations relative to the immobile element Ti show that elements such as Si, Fe, Mg, K and Na are leached out; Al, Zr, V, Th, Nb, Ba and REEs particularly LREE are concentrated; and Hf, Ta, Co, Rb, Cs, Be and U are relatively immobile during the bauxitisation process. The Bauxite ores are characterized by progressive enrichment of the REE compared to parent rock, intense LREE/HREE fractionation, relatively stable negative Eu anomalies, and weak negative Ce anomalies. Geochemical data reveal progressive enrichment of the REE and intense LREE/HREE fractionation toward the lower parts of the Bauxite profile. In the studied deposit Ce behaves differently from the other REEs (especially LREE) and show few changes in the Ce anomalies throughout the Bauxite horizon. These observations suggest that factors such as fluctuations in soil solution pH, REE ionization potential and function of carbonate host rock as a geochemical barrier had significant role in the distribution and fractionation of trace elements and REEs during bauxitisation in the Bagoushi Bauxite deposit. Several lines of evidences such as Eu anomalies, immobile element ratios (Zr/Hf and Nb/Ta), as well as similarity in REE patterns indicate that the underlying marly limestone (Sarvak Formation) could be considered as the source of Bauxite horizons and suggest that the source material for the Bagoushi Bauxite was provided from a siliciclastic material derived from a continental margin.

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APA: Copy

ZAMANIAN, H., Beiranvand, g., & Ahmadnejad, f.. (2019). Mineralogy, Geochemistry and the Origin of the Bagoushi Karst Bauxite Deposit, Northwestern Fars Province, Iran. GEOSCIENCES, 28(112 ), 269-280. SID. https://sid.ir/paper/32161/en

Vancouver: Copy

ZAMANIAN H., Beiranvand g., Ahmadnejad f.. Mineralogy, Geochemistry and the Origin of the Bagoushi Karst Bauxite Deposit, Northwestern Fars Province, Iran. GEOSCIENCES[Internet]. 2019;28(112 ):269-280. Available from: https://sid.ir/paper/32161/en

IEEE: Copy

H. ZAMANIAN, g. Beiranvand, and f. Ahmadnejad, “Mineralogy, Geochemistry and the Origin of the Bagoushi Karst Bauxite Deposit, Northwestern Fars Province, Iran,” GEOSCIENCES, vol. 28, no. 112 , pp. 269–280, 2019, [Online]. Available: https://sid.ir/paper/32161/en

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