Some data bearing on the origin of Jamaican bauxite

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ID: 308482
1961
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Abstract
Twenty-nine samples of the White Limestone formation from Kendal, Jamaica, have been analyzed for SiO ~2~ , Al ~2~ O ~3~ , and Fe ~2~ O ~3~ . As the bedrock of the aluminous soils in Jamaica and Hispaniola, the impurity content of this unit has an important bearing on the origin of the bauxite deposits. The average alumina content of the limestone indicated by these analyses is 0.036%. This figure corresponds to a tentative value given by Goldich and Bergquist and confirms their calculation of the thickness of limestone that would have to have been dissolved to account for the present reserves of ore on the Rochelais plateau in Haiti. The unusual ratios of alumina to silica indicate the presence of excess alumina in the limestone, possibly as aluminum phosphates or alumina hydrates. Efforts at isolating the Al-bearing minerals by acid leaching have so far been unsuccessful. The Al ~2~ O ~3~ :Fe ~2~ O ~3~ ratios of the limestone as determined from these analyses correspond to Al ~2~ O ~3~ :Fe ~2~ O ^3^ ratios in the bauxite. Such correspondence cannot be taken as evidence that the ores are insoluble residues of the limestone. Both the bauxite and the limestone may have derived their iron oxide and alumina from the older aluminous rocks exposed in the higher central parts of the island.
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Authors William C. Kelly
Journal american journal of science
Year 1961
DOI
10.2475/ajs.259.4.288
URL
https://ajs.scholasticahq.com/article/58859.pdf
Keywords Keywords not found

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