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Base and precious metal stream-sediment geochemistry related to mafic-ultramafic bodies in the Alabama and adjacent Georgia Inner Piedmont

Robert B. Cook
Base and precious metal stream-sediment geochemistry related to mafic-ultramafic bodies in the Alabama and adjacent Georgia Inner Piedmont (in Ultramafic rocks of the Appalachian Piedmont, Steven K. Mittwede (editor) and Edward F. Stoddard (editor))
Special Paper - Geological Society of America (1989) 231: 93-103

Abstract

The Alabama and adjacent Georgia Inner Piedmont consists of a complex suite of metasedimentary and metavolcanic units that could have associated syndepositional hydrothermal systems. To evaluate the potential presence of such systems, a preliminary reconnaissance (silt and heavy minerals stream sediment) geochemical survey, consisting of 553 sites, was conducted. Silts were analyzed for Cu, Pb, and Zn; panned concentrates, for Au. Measured geochemical averages and the corresponding standard deviations for the samples are 16 + or - 10 ppm Cu, 9 + or - 6 ppm Pb, 37 + or - 17 ppm Zn, 61 + or - 29 ppm combined Cu-Pb-Zn, and 0.128 + or - 0.751 ppm Au. Moderate correlation is shown among Cu, Pb, and Zn, but Au is statistically independent of the base metals. Streams draining the well-documented mafic-ultramafic bodies of the Doss Mountain, Slaughters, and Easton areas exhibit low base and precious metal values. However, the generally similar areas of the Boyds Creek synform and the West Point melange have anomalously high Cu-Pb-Zn and Au signatures that coincide locally with zones of tourmalinite, iron formation, gossan, and altered ultramafic bodies. These data suggest that hydrothermal systems were associated with the development of the ophiolitic suites of the Boyds Creek synform and nearby West Point melange, and that stream-sediment geochemical anomalies within these areas may locally reflect mineralization related to such metal-rich systems.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 231
Title: Base and precious metal stream-sediment geochemistry related to mafic-ultramafic bodies in the Alabama and adjacent Georgia Inner Piedmont
Title: Ultramafic rocks of the Appalachian Piedmont
Author(s): Cook, Robert B., Jr.
Author(s): Mittwede, Steven K.editor
Author(s): Stoddard, Edward F.editor
Affiliation: Auburn Univ., Dep. Geol., Auburn, AL, United States
Affiliation: S.C. Geol. Surv., Columbia, SC, United States
Pages: 93-103
Published: 1989
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2231-4
References: 29
Accession Number: 1989-036147
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 4 tables, sketch maps
N30°00'00" - N35°00'00", W88°30'00" - W85°00'00"
N30°19'60" - N35°00'00", W85°34'60" - W80°45'00"
Secondary Affiliation: N.C. State Univ., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1989
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