Boboluyieh bauxi te-laterite deposit of south-cast
Kemlan is presented at the base of the Naiband Formation
(upper Triassic) and was directly formed on a Karstic surface
of dolomitic parts of the Shotori Formation. This dcposit has
a reserve of 15 mill ion lonnes. Diaspore, boehmite, chlorite,
hematite, goethite, kaolinite, anatase and rutile arc the major
minerals in this deposit. The common texture of tbis unit is
oolitic to pisolitic. The presence of some volcanic rock
fragments with pi lotaxitic texture as well as bipyramid
pseudol11orphic shape of olivine and clinopy roxene gra ins
reveal thai the protolith of bauxites was probably a volvan;c
rock of basaltic type.
Geochemical studies indicate that Bolboluy ieh bauxite is
composed of40.37% AI20 3, 24.64% Fe20) and 13.92% Si02•
Based on the geochemical characteristics, Bolboluyieh
bauxi te is formed under condition of high silica leaching and
concomitant enrichment of aluminium and iron which
corrcsponds with pH between 4 to 8.5 and Eh of +0.4 to + I.