Mineralogy, Geochemistry and Genesis of Corundum-Amesite Rich Meta-Bauxites in the Lavand Deposit, Mahallat, Central Iran

Articles in Press

Document Type : Original Article

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10.22128/ijcm.2025.2975.0

Abstract

Lavend bauxite deposit is located 11 km west of Mahallat city, in the north of 1:100000 Mahallat Sheet; structurally, it is part of the Central Iran zone and part of the Precambrian metamorphism of Golpayegan. Two main bauxite-laterite zones of the Permian age, are enclosed between layers of Arkose sandstone units and yellow marble limestone. This deposit has a wide variety of minerals, including aluminum and iron oxides-hydroxides, silicates, titanium oxides, and carbonates; Corundum and Amesite are the main minerals in the deposit. The index textures of these specimens include oolitic-pisolitic, oolitic-spheroid and oolitic-spastolite textures. Lavand bauxites contain 48-56% Al2O3, 3 to 25% Fe2O3, 4 to 18% SiO2 and 1 to 6% TiO2. Based on the Al2O3-Fe2O3-SiO2 Ternary diagrams this deposit is classified as bauxite and iron bauxite; these samples are Al2O3 rich that formed during the lateritization process. Based on the studies, Permian basalts and diabase dykes can be considered as the source rock of Lavand meta-bauxite. So weathering of the source rock and the effect of bauxitization processes have caused the leaching of alkaline and alkaline earth elements from the environment and the bauxite is formed; which it is formed during subsequent processes of diagenesis and metamorphism.

 

Keywords

Iranian Journal of Crystallography and Mineralogy

Articles in Press, Accepted Manuscript
Available Online from 09 August 2025

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History

  • Receive Date: 01 May 2025
  • Revise Date: 09 August 2025
  • Accept Date: 09 August 2025

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