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Full-Text Articles in Physical Sciences and Mathematics
Petrographic Observations Of Stromatolites In The Late Cambrian To Early Ordovician Knox Group, Northwest Georgia And Their Relationship To Stromatolitic Fabrics Over Geologic Time, Evan Ritchey
Honors Theses
Silica deposits are common in Proterozoic carbonate platforms and are interpreted to form early in the diagenetic history of the carbonate strata. Black early diagenetic chert deposits are often associated with evidence of ancient microbial mats, or stromatolites. Proterozoic chert nodules can contain well-preserved microfossils, because silicification occurs rapidly; however, silica deposition has changed over time and it is unclear if similar deposits exist in the Cambrian period after silica-utilizing organisms evolved. The Copper Ridge Dolomite in the Knox Group, northwest Georgia, which was deposited in the late Cambrian to early Ordovician, contains black chert nodules that follow the structure …
Characterization Of Metamorphic Zones In The Tennessee Blue Ridge Using Gis And Digital Imaging Processing, Hayley Beitel
Characterization Of Metamorphic Zones In The Tennessee Blue Ridge Using Gis And Digital Imaging Processing, Hayley Beitel
Honors Theses
The origin of metamorphic zones of the Blue Ridge is attributed to metamorphic events that affected sedimentary rocks of debated age, leading the topic to be controversial and continuously studied. The present study seeks to refine the metamorphic isograds of the Tennessee Blue Ridge based on Barrovian index minerals in pelitic rocks and the texture patterns these pelitic rocks present. Methods used in the present study are supported by conventional petrography, powder X-ray diffraction, and by GIS and digital image processing. Metamorphic isograds in the Blue Ridge have been determined mainly by identification of index minerals using a polarizing petrographic …