A
geochemical, petrographic and field study of the Uchee belt was supported
by an NSF grant (EAR-9820701) to Dr. Hanley. The grant period was from 1999
through 2002. A second grant (EAR-0139550) to continue the Uchee
belt project was awarded by NSF for the period 2002 through 2005. The ACRES homepage summarizes some of the ACRES projects.
Many of the images, graphs, and internet connections below describe some of the results of this investigation. Foundations for the Uchee belt study have been laid over the years by the contributions of many Columbus State Geology majors. Notable among these are Ed Graham, Betty Robinson, Larry Smith, and B-J Kim.
Flat Rock Park lineated gneiss and assorted intersecting intrusions.
Panorama of the upper pavement at Flat Rock Park looking northwest. Note intersecting intrusions. Four photographs stitched together using QuickStitch by Enroute Imaging.
Geologic map of the Flat Rock Park pavement shown above. The light folded
pegmatite dike and the light gray aplite in the photo show up in this map.
I took a CorelDraw image, exported it as a .GIF and took it into this web
page. The color translation is not very good. I guess I will have to use
JPEG.
The ACRES 2003 summer group, building on the work of previous groups summarized the major, trace and REE data for lineated gneiss and aplites from both the northern and southern limbs of the Lake Olive Synform.
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Harker Diagrams comparing meta-aplite and lineated gneiss from the southern limb of the Lake Oliver synform. |
Fresh blast block of aplite cutting lineated (Motts) gneiss, Old River
Road. Motts on River road is slightly more mafic than at Flat Rock Park.
Weathered
surface showing aplite cutting lineated gneiss. Surface of exposure is normal to the lineation.
Ledge
of lineated gneiss, folded aplite and amphibolite sliver, and tabular discordant
pegmatite, Flat Rock Park, Columbus, Georgia. This is the ledge and the far end
of the ourcrop shown in the panorama above.
Close-up
of area below camera bag in the Flat Rock Park ledge photo, above.
Manchester Expressway corona image Photomicrograph of hornblende, quartz, epidote separating pyroxene from microcline in granitoidal gneiss. This is the same locality sampled for the lineated gneiss and aplite whose analyses are reported above.
At North Highland Mills in one of the blast blocks, the ACRES UCHEE1999 group saw a biotite-rich rock cutting the Phenix City gneiss. Joe Kopera presented the chemical analysis of this rock in his report. The schist was at least 0.5 m thick and contained a small granitoidal vein. Follow the links, view 1 and view 2, to two sets of micrographs, each with a plane polarized light and a cross polars view, at different magnifications. This weakly to non-foliated rock contains biotite, quartz, kspar, abundant biaxial positive clinopyroxene and light green hornblende. Zircon and apatite are abundant. The mineral content is identical to a lithology found at Bibb quarry and referred to elsewhere as Dreyer's rock. The latter, however, is distinctly schistose. Biotite from Dreyer's rock has been dated by Dr. Glenn Stracher and Dr. Marion Wampler at 260 +/- 5 my (see below). This is an odd lithology.
; Thesis title: Structure and petrology of the northwestern Tobacco Root Mountains, Madison County, Montana.
This is a 90% reduction of the original CorelDraw4 map produced for the "Mylonite and other fault-related rocks ...." fieldtrip organized by Mark Steltenpohl and Tom Hanley for the Spring meeting of the SEGSA held in Auburn, AL, March 27-28, 1997. Use the "thumbnail" to get to a 50% reduction map.
This is a reduction of a geologic map that shows the rocks and area around Mr. Monteza's ranch in the Mamoni River valley, eastern Panama. Use the "thumbnail" to get a larger scale map.
