Larsen, A. .
1958.
A Heavy Mineral Analysis of Pleistocene Terrace Sands in Liberty & Wakulla Counties, Florida..
Geology. Tallahassee, Florida State University.
The occurrence and distribution of heavy minerals in portions of the Pamlico and Wicomico terraces in Wakulla and Liberty counties of northwest Florida are determined. A new sampling apparatus was used to obtain samples from depths to 20 feet. This sampling apparatus utilized a water jet system which was adapted from water-well drilling equipment that is in common use in Florida .The samples were flushed out of the hole and caught in concentrically arranged buckets and tub. Four 5-foot composite samples were obtained from the bore holes. Laboratory heavy mineral analysis of the samples shows that the weight percentages of the heavy minerals are too low to be of cormnerciali interest. The range of concentration is from 0.02% to 0.64% with a mean of 0. 22% .The minerals" in order of their decreasing abundance are: ilmenite-magnetite, kyanite, rutile, zircon, staurolite, sillimanite, leucoxene, tourmaline, limonite, pyrite, monazite, some unidentified minerals which are probably sulfides, garnet, collophane and hornblende. Multivariate analysis of variance is used to evaluate the heavy mineral member percentages. Comparison of data obtained from the Okefenokee and Wicomico terrace mineral suites shows that the heavy mineral suites of the two terraces are statistically homogeneous and, therefore, cannot be distinguished by these means in the by this investigation. The heavy mineral analysis shows that the Wicomico bar and the Wicomico flat can be differentiated on the basis of quantity, that is, the amount of heavy minerals is less than the amount present on the Wicomico flat. The analysis of variance, however, shows that the Wicomico bar cannot be distinguished from the Wicomico flat on the basis of variability of the heavy mineral suites. The data of this paper tend to support the theory that heavy minerals are more concentrated in the transition zone between terraces than in the terrace proper.