TY - Generic T1 - Geochemistry of gneisses and amphibolites in the Uchee Belt of western Georgia and eastern Alabama; an ACRES progress report T2 - Abstracts with Programs - Geological Society of America Y1 - 2000 A1 - Joseph P Kopera A1 - Nicholas, Brian A1 - Todd, Dave A1 - Davison, Jeff A1 - Hanley, Tom A1 - Kar, Aditya A1 - La Tour, Timothy E. A1 - Edwards, Tonya KW - #StaffPubs KW - Alabama KW - amphibolite KW - chemical composition KW - Columbus Georgia KW - dikes KW - Georgia KW - gneisses KW - Igneous and metamorphic petrology 05A KW - inclusions KW - intrusions KW - metamorphic rocks KW - Muscogee County Georgia KW - Uchee Belt KW - United States KW - xenoliths AB - Undergraduate students, high school teachers, and university faculty representing ACRES (Atlanta Consortium for Research in Earth Sciences) studied lineated gneiss (LG) exposed at Flat Rock Park (FRP) and vicinity in Columbus, GA, and Motts gneiss (MG) in eastern Alabama. The LG and MG are mineralogically and geochemically granitoidal lineated orthogneisses. They contain deformed mafic xenoliths, as well as aplitic, granitic and pegmatoidal dikes that cut the dominant lineation. Based on chemical analyses, the LG from FRP and the MG plot as granite on the IUGS diagrams and the Le Bas diagram. Similarity in incompatible trace element ratios (e.g., Zr/Nb) and highly evolved characteristics of aplite with respect to the host gneisses, indicate there is probably a genetic link between the MG and the FRP LG. These rocks are chemically distinct from other nearby felsic gneiss. Phenix City gneiss amphibolites from Lindsey Creek and North Highland Mills dam in Columbus were also analyzed for major and trace elements. These amphibolites are low K tholeiitic rocks with an island arc affinity and are similar to rocks from the area that have already been analyzed. The amphibolites show a wide range of fractionation (41 to 62 percent SiO (sub 2) ). Consistency in incompatible element ratios over a wide range of fractionation of some of the samples show a probable genetic relationship among the various amphibolites of Lindsey Creek. Future work should involve more extensive collecting and analysis of both felsic rocks and amphibolites in the Uchee belt. More time should also be spent describing the thin sections of the existing collection and comparing the REE patterns for the FRP, MG and other felsic rocks in the Uchee belt. JF - Abstracts with Programs - Geological Society of America PB - Geological Society of America (GSA) : Boulder, CO, United States CY - United States VL - 32 SN - 00167592 IS - 22 N1 - Accession Number: 2002-039126; Conference Name: Geological Society of America, Southeastern Section, 49th annual meeting; Charleston, SC, United States; Conference Date: 20000323; Language: English; Coordinates: N322800N322800W0845900W0845900; Coden: GAAPBC; Collation: 1; Collation: 31; Publication Types: Abstract Only; Serial; Conference document; Updated Code: 200214; Monograph Title: Geological Society of America, Southeastern Section, 49th annual meeting; Monograph Author(s): Anonymous; Reviewed Item: Analytic JO - Abstracts with Programs - Geological Society of America ER -