21 Aug Origin of Diagenetic Pyrite in the Quilon Limestone, Kerala, India K. K. MENON
Letters to Nature
Nature 213, 1219-1220 (25 March 1967) | doi:10.1038/2131219a0; Received 28 November 1966
1. Department of Geology,UniversityofKerala,Trivandrum,India.
ALTHOUGH microscopic pyrite from marine and non-marine argillaceous sediments of most geological ages has been extensively studied, its mode of origin has not been clearly understood. Berner1 and Kalliokoski2 attributed the origin to the reaction of hydrogen sulphide formed by sulphite reduction, with iron-bearing minerals in sediments; but these minerals were not discovered. I have recorded framboidal and other types of diagenetic pyrite in the thin bed of marine, fossiliferous, Quilon limestone3 of Burdigalian age4. Recent examination of the heavy minerals from limestone samples at Padappakara the type area has brought forward some new evidence, which clearly establishes that the fine-grained pyrite was produced by an alteration of detrital, iron-bearing mica, optically identified as biotite.