Age and zircon inheritance of eastern Blue Ridge plutons, southwestern North Carolina and northeastern Georgia, with implications for magma history and evolution of the Southern Appalachian Orogen

2000 ◽  
Vol 300 (2) ◽  
pp. 142-172 ◽  
Author(s):  
C. F. Miller
Keyword(s):  
North Carolina ◽  
Blue Ridge ◽  
Southern Appalachian ◽  
Appalachian Orogen

Late Quaternary Landscape Evolution at Flat Laurel Gap, Blue Ridge Mountains, North Carolina

1988 ◽  
Vol 30 (1) ◽  
pp. 7-11 ◽  
Author(s):  
David S. Shafer
Keyword(s):  
North Carolina ◽  
Landscape Evolution ◽  
Late Quaternary ◽  
Appalachian Mountains ◽  
Blue Ridge ◽  
Blue Ridge Mountains ◽  
Southern Appalachian ◽  
Organic Sediment ◽  
Absolute Age ◽  
Age Determinations

Analysis of colluvial, fluvial, and bog sediments at Flat Laurel Gap (1500 m) in the Blue Ridge Mountains of North Carolina provides a record of late Quaternary landscape evolution. Thermoluminescence (TL) analysis provides the first absolute-age determinations available for presumed periglacial deposits in the southern Appalachian Mountains. The Pleistocene/Holocene transition, dated between 11,900 and 10,100 yr B.P., represents a period of climatic amelioration and a change from colluvial to alluvial processes. A TL date of 7400 ± 1000 yr B.P. for matrix within a block-stream indicates possible early Holocene reworking of Pleistocene periglacial colluvium. Organic sediment deposition in a bog that began about 3400 yr B.P. increased in rate from 0.02 to 0.09 cm/yr with the onset of logging and land clearance about 1880 A.D.

New paleontological evidence for complex middle Paleozoic tectonic evolution in the Appalachian western Blue Ridge

2020 ◽  
Vol 132 (9-10) ◽  
pp. 2105-2118
Author(s):  
Mary E. Lupo ◽  
James F. Tull ◽  
John Repetski ◽  
Paul A. Mueller
Keyword(s):  
North Carolina ◽  
Tectonic Evolution ◽  
Blue Ridge ◽  
Relative Paucity ◽  
Southern Appalachian ◽  
Stratigraphic Framework ◽  
Taconic Orogeny ◽  
Middle Paleozoic ◽  
Thrust Sheets ◽  
Group B

Abstract Reconstructing the tectonic evolution of the southern Appalachian metamorphic internides is hampered by the relative paucity of accurate geochronologic constraints and the apparent rarity or absence of Paleozoic cover sequences. At the orogen’s greatest width, near the junction of Georgia, North Carolina, and Tennessee, the western Blue Ridge is a composite metamorphic allochthon of three major thrust sheets: (A) a basal sheet above the Great Smoky fault overlying rocks of the foreland thrust belt composed of the Lower Cambrian Chilhowee Group and underlying Sandsuck Formation of the Neoproterozoic Walden Creek Group; (B) an intermediate sheet above the Maggies Mill–Citico fault composed of the middle Paleozoic Maggies Mill Formation; and (C) the main mass of the western Blue Ridge above the Alaculsy Valley–Miller Cove fault composed of the Neoproterozoic Ocoee Supergroup, and younger overlying sequences in the Epperson and Murphy synclinoria. The age of peak deformation and metamorphism in all of these sequences has historically been assigned to the Ordovician Taconic orogeny, but recent paleontologic discoveries suggest these events are significantly younger. In addition to the middle Paleozoic fauna recently reported from the Maggies Mill Formation in the intermediate thrust sheet, Silurian-Devonian conodonts have been found in units formerly correlated with the Walden Creek Group in the Epperson synclinorium. These discoveries suggest that widespread middle Paleozoic successor basin sequences unconformably overlie the Neoproterozoic-Cambrian drift-facies of the Chilhowee Group (and equivalents) and underlying rift-facies of the Ocoee Supergroup, and require modifications to existing models for the timing of the region’s stratigraphic framework and tectono-metamorphic evolution.

scholarly journals Further observations on the changes in the breathing and the blood at various high altitudes

1914 ◽  
Vol 88 (602) ◽  
pp. 248-258 ◽  
Keyword(s):  
North Carolina ◽  
Rocky Mountains ◽  
Previous Investigation ◽  
Blue Ridge ◽  
High Altitudes ◽  
The West ◽  
Alveolar Air ◽  
Blue Ridge Mountains ◽  
Southern Appalachian ◽  
Anglo American

In a previous investigation carried out in connection with the Anglo-American pike’s Peak Expedition (1911), the changes in the breathing and the blood at high altitudes were recorded at atmospheric pressures ranging from 625 to 458 mm. Of mercury. Lack of time prevented further observations being made, and in the graphic representation of the gases of the alveolar air and of the percentage of hæmoglobin in the blood subsequently published, the supposed values for atmospheric pressures ranging from 625 to 760 mm. of mercury were made by me in North Carolina, U. S. A., during the months of July, August, and September of 1913. Three localities were chosen in the Southern Appalachian chain, approximately between 35° and 35° 6’ N. latitude, and 82° 5’ and 83° 25’ W. longitude : Highlands (altitude 3850 feet), the highest village east of the Rocky Mountains, situated in the Blue Ridge Mountains; Waynesville (altitude 2645 feet) in the Balsam Mountains, and Asheville (altitiude 220 feet) situated in the valley of the French Broad River, with the Blue Ridge Mountains lying to the south and east, and the foot-hills of the Unaka Mountains to the west and north.

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