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Spacer ImageOpen File Report 2019-04, Heavy mineral distributions in offshore sediments using Q-mode factor analysis
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by Berquist, C.R., Jr., and Boon, J.D., 2019, 35 p. Q-mode factor analysis was used on six data sets to evaluate the spatial relationship of offshore sediments via heavy mineral compositions in areas of the Chesapeake Bay mouth and Virginia Continental Shelf. The investigations involved up to 36 minerals and 538 samples. Ilmenite, garnet, pyrobole (amphibole + pyroxene), and to some extent magnetite commonly define factors and end-member sample compositions. For both a small and large number of samples, sediments in the area around Smith Island Shoals and a few other remote locations are mineralogically different from other sampled areas. For most of the investigations, samples fell into offshore or inshore groups, and the inshore group might be further divided into subgroups approximately north and south of the Bay mouth. Mixing is common in the Bay mouth area and several inshore areas.
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