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Geological Society, London, Special Publications; 1990; v. 52; p. 139-155;
DOI: 10.1144/GSL.SP.1990.052.01.10
© 1990 Geological Society of London

Comparative geology and mineralogy of the southeastern United States and Togo phosphorites

S. J. Van Kauwenbergh1 & G. H McClellan2

1 Fertilizer Technology Division, International Fertilizer Development Center (IFDC), Muscle Shoals, Alabama 35662, USA
2 Department of Geology, University of Florida, Gainesville, Florida 32611, USA

The physical and mineralogical characteristics of the southeastern United States and Togo phosphorite deposits are the result of both primary depositional factors and secondary diagenetic processes. The North Carolina phosphorites appear to be ‘unaltered’ or are in the first stages of alteration. Both the Florida and Togo phosphorites have resulted in the removal of mineral species (primarily carbonates), systematic decarbonatization of the carbonate-fluorapatite, the development of iron and aluminium phosphates, and clay mineral alteration profiles.