Separation and identification of the silt-sized heavy-mineral fraction in sediments

Abstract

FIGURES 1. Flow diagram outlining separation procedures 2 2. Plot of density versus concentration of sodium polytungstate 2 3. Schematic of SEMI AIAIEDS system 4 4. Flow diagram of procedures performed during SEM/AIAIEDS analysis 5 5. Map of sample locations in test study area 7 6-10. Examples of actual data output from the image analysis program for a sample collected from station N5 in the test study area (fig. 5): 6. Histogram of particle population percent versus chemical class (macro class) 10 7. The number of particles in user-specified size ranges within each chemical category 10 8. The percentage of total particles in size ranges for each chemical category 11 9. Histogram of weight percentages versus chemical category 11 10. Weight percentages for size ranges 12 TABLES 1. Partial list of user-defined chemical categories 6 2. List of chemical categories or macro classes 6 3. Results from a test sample, particles mounted versus identified 7 4. Weight percentages of silt-sized minerals from test area 8 5. Abundances of nonmicaceous, silt-sized heavy minerals in samples from test study area