Other
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..411s&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 4, p. 411-420
Other
9
India, Iron Ores, Magnetic Measurement, Maximum Likelihood Estimates, Radiation Measurement, Sediments, Magnetization, Mathematical Models, X Ray Diffraction
Scientific paper
A new method of sediment source modeling, using a maximum likelihood unmixing algorithm, has been applied to combined magnetic and radioactivity measurements on stream bedload sediments. Particles from an iron-ore mining site can be differentiated from those derived from catchment sources and their relative contributions to the stream bedload calculated. Upstream of the mine workings, high natural catchment components of over 97% are modeled in the stream sediments by the unmixing algorithm. Despite antipollution precautions, downstream of the mine outfall the average mine waste component increases dramatically and is modeled as 47% of the bedload. The general nature of the maximum likelihood method allows very different parameters such as artificial magnetisation and natural radioactivity to be incorporated in the unmixing procedure. Consequently the unmixing method is also applicable to other disciplines.
Galloway R. B.
Shankar Raji
Thompson Rachel
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