GEOCHEMICAL CHARACTERISTICS OF LATERITES: THE AILIBALTALU DEPOSIT, IRAN

Yıl 2014, Cilt: 148 Sayı: 148, 69 - 84, 01.06.2014

Ali Abedını Ali Asghar Calagarı Khadijeh Mıkaeılı

https://doi.org/10.19111/bmre.55769

Cited By: 4

Öz

Alibaltalu laterite deposit is located ~20 km northeast of Shahindezh, south of West-Azarbaidjanprovince (NW of Iran). This deposit is developed as stratiform lenses along the boundary ofElika dolomites (Triassic) and Shemshak sandstones (Jurassic). The distribution fashion ofminerals such as boehmite, diaspore, kaolinite, muscovite-illite, rutile, anatase, hematite andgoethite in this deposit was accompanied by the development of four types of ore facies: (1)ferrite; (2) laterite; (3) bauxitic kaolinite; and (4) kaolinitic bauxite. Petrographically, the oresshow conglomeratic, rounded-granular, veinlet, colloform, pelitomorphic, pseudo-porphyritic,nodular, and spongy textures. Comparison of distribution pattern of elements along a selectiveprofile across the deposit reveals that ferrugenization-deferrugenization mechanism played aprominent role in distribution of Al, Si, Ti, HFSE, LREEs, HREEs, U, and Th during weatheringprocesses. Distribution pattern of REEs normalized to chondrite indicates a poor differentiationof LREEs from HREEs and generation of poor negative Eu anomaly during the evolution of thisdeposit. These aspects along with ratios of Al2O3/TiO2and intense differentiation of Al from Fein the course of weathering processes may indicate a mafic protolith for the deposit.Geochemical consideration of low-mobile elements demonstrates that this deposit is likelyresulted from alteration and weathering of basaltic to andesitic rocks. By regarding to thedistribution mode of elements such as Ni, Cr, Zr, and Ga within the ores, it can be deduced thatthis deposit was initially formed authigenically and then later was contaminated by other rockmaterials during erosion and transportation from its original place to the present site. 

Anahtar Kelimeler

Laterite, Protolith, Elemental distribution, Alibaltalu, Shahindezh, Iran

Kaynakça

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