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UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Geochemical Data for 608 Heavy-mineral Concentrates from the Northeast part of the Greenville x 2° Quadrangle, South Carolina, by Semi-quantitative Emission Spectrography by John C. Jackson 1 and Betty M. Adrian 2 Open-File Report 91-15 Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. U.S. Geological Survey, Reston, Virginia 22091 U.S. Geological Survey, Denver, Colorado 80225

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Page 1: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL … · Mineral Resource Assessment Program (CUSMAP) of the U. S. Geological Survey (Lesure and others, in prep.). Statistical evaluations,

UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

Geochemical Data for 608 Heavy-mineral Concentrates fromthe Northeast part of the Greenville 1° x 2° Quadrangle,

South Carolina, by Semi-quantitative EmissionSpectrography

by

John C. Jackson1 and Betty M. Adrian2

Open-File Report 91-15

Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.

U.S. Geological Survey, Reston, Virginia 22091 U.S. Geological Survey, Denver, Colorado 80225

Page 2: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL … · Mineral Resource Assessment Program (CUSMAP) of the U. S. Geological Survey (Lesure and others, in prep.). Statistical evaluations,

Geochemical data for 608 Heavy Mineral Concentrates from theNortheast Part of the Greenville 1° x 2° quadrangle, South

Carolina, by Semi-quantitative Emission Spectography

by

John C. Jackson and Betty M. Adrian

U.S. Geological Survey

Introduction

Geochemical analysis of 608 heavy-mineral concentrate samples taken from streams in the northeast part of the Greenville 1° x 2° quadrangle, South Carolina, are given in this report (table 1). This data supplements a quadrangle- wide assessment prepared under the Conterminous United States Mineral Resource Assessment Program (CUSMAP) of the U. S. Geological Survey (Lesure and others, in prep.). Statistical evaluations, element distribution maps, and discussions concerning the data are found in Curtin and others (in prep.) and Jackson and Moore (in prep.).

The samples analyzed in this study represent the heavy resistate minerals derived from rocks of the Inner Piedmont province of South Carolina. The rocks within the sampling area consist primarily of layered micaceous schists, sillimanite-mica schists, and biotite gneisses; inter-layered with minor amounts of amphibolite, quartzite, and hornblende gneiss (Nelson and others 1989). Extensive areas of granite and granitic gneisses of mostly Paleozoic age are present within the sampling area (Nelson and others 1989).

Sample collection and preparation

The concentrates analyzed in this study were selected from archived samples originally collected in 1952 by D.W. Caldwell and N.P. Cuppels of the U.S. Geological Survey (USGS), as part of a program by the USGS to appraise monazite occurrences in the southeastern United States (Overstreet and others 1968). We selected these previously collected samples in order to avoid a costly and time consuming resampling of the study area. The 608 samples reported here represent 535 locations, the remainder are replicates.

The sampling method is described in detail by Overstreet and others (1968) and is summarized here only briefly. Samples of gravel or sand were dug from riffles in the present channels of streams. They were wet sieved through a 1/8 inch screen and the coarser material discarded prior to panning a volume of material that roughly filled a 16 inch diameter stainless steel gold pan.

Page 3: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL … · Mineral Resource Assessment Program (CUSMAP) of the U. S. Geological Survey (Lesure and others, in prep.). Statistical evaluations,

The minerals of specific gravity below 2.89 g/cm , including quartz and feldspar, were removed from the concentrate by floating them in bromoform. The ferro-magnetic and strongly para-magnetic fractions of the concentrates were then removed using a Frantz isodynamic separator; the magnetic separation method used is outlined in detail in Jackson and Moore (in prep).

Analytical Method

The high-density, para-magnetic fractions of the concentrates were analyzed for 31 elements using a six-step, semiquantitative, emission spectrographic method (Grimes and Marranzino 1968). This spectrographic method reports values, in percent or ppm, as one of six steps per order of magnitude (1, 0.7, 0.5, 0.3, 0.2, 0.15, and multiples of 10 of these numbers), and these values are the approximate geometric midpoints of the concentration ranges whose boundaries are 1.2, 0.83, 0.56, 0.38, 0.26, 0.18, 0.12, ect.. The analytical uncertainty of the method is +1 reporting interval 83 percent of the time and +2 reporting intervals 96 percent of the time (Matooka and Grimes 1976).

The lower limits of detection, or first reporting interval, for elements reported in percent are as follows: Fe(.l), Mg(.05), Ca(.l), and Ti(.005). The lower limit of detection, or first reporting interval, for elements reported in parts per million are as follows: Ag(l), As(500), Au(20), B(20), Ba(50), Be(2), Bi(20), Cd(50), Co(10), Cr(20), Cu(10), La(50), Mn(20), Mo(10), Nb(50), Ni(10), Pb(20), Sb(200), Sc(10), Sn(20), Sr(200), Th(200), V(20), W(100), Y(20), Zn(500), and Zr(20).

References

Curtin G.C., Adrian, B.M., Dennon, K.O., and Jackson, J.C., (in prep.), Summary of exploration studies in the Greenville 1° x 2° quadrangle, Georgia, South Carolina, and North Carolina: U.S. Geological Survey Miscellaneous Field Studies Map ____.

Grimes, D.J., and Marranzino, 1968, Direct-current arc andalternating-current spark emission spectrographic field methods for the semiquantitative analysis of geologic materials: U.S. Geological Survey Circular 591.

Jackson, J.C., and Moore, W.J., (in prep.) Geochemical study of heavy mineral concentrates from the northeast part of the Greenville 1° x 2° quadrangle, South Carolina: U.S. Geological Survey Bulletin ___.

Page 4: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL … · Mineral Resource Assessment Program (CUSMAP) of the U. S. Geological Survey (Lesure and others, in prep.). Statistical evaluations,

Lesure, F.G., Curtin, G.C., Daniels, D.L., D'Agostino, J.P., and Nelson, A.E., (in prep.)/ The Conterminous United States Mineral Assessment Program Background information to accompany folio of geologic, geophysical, geochemical, mineral-occurrence and mineral-resource assessments maps of the Greenville 1° x 2° quadrangle, Georgia, South Carolina, and North Carolina: U.S. Geological Survey Circular ____.

Matooka, J.M., and Grimes, D.J., 1976, Analytical precision of one-sixth order semiquantitative spectrographic analysis: U.S. Geological Survey Circular 738, 25p.

Nelson, A.E., Horton, J.W., Jr., and Clarke, J.W., 1989,Geologic map of the Greenville 1° x 2° quadrangle, GA, SC, and NC: U.S. Geological Survey open-file report 89-9.

Overstreet, W.C., White, A.M., Whitlow, J.W., Theobald, P.K., Caldwell, D.W., and Cuppels, N.P., 1968, Fluvial monazite deposits in the Southeastern United States: U.S. Geological Survey Professional Paper 568.

Page 5: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL … · Mineral Resource Assessment Program (CUSMAP) of the U. S. Geological Survey (Lesure and others, in prep.). Statistical evaluations,

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