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Thunderhead Sandstone

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Age data for xenotime and monazite from the <span class="search-highlight">Thunderhead</span> <span class="search-highlight">Sandstone</span> (sample x...

Age data for xenotime and monazite from the Thunderhead Sandstone (sample x...

Published: 01 February 2023
Fig. 15. Age data for xenotime and monazite from the Thunderhead Sandstone (sample x9-02-3). (A) Green ellipses ( n  = 17) record the time of diagenetic formation of xenotime (see inset of weighted average of 207 Pb/ 206 Pb ages). Blue ellipses record a younger event, probably metamorphic
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BSE images of detrital monazite (light to medium gray with patchy zoning) a...

BSE images of detrital monazite (light to medium gray with patchy zoning) a...

Published: 01 February 2023
Pb content (not used in weighted average calculations). Ages adjacent to spots are 206 Pb/ 238 U ages (in Ma); errors are ± 1σ. A—monazite in Thunderhead Sandstone (analyzed in thin section). B—monazite from Thunderhead Sandstone (analyzed as separated grains). C—monazite from Thunderhead Sandstone
Journal Article

SHRIMP U–Pb geochronology of Mesoproterozoic basement and overlying Ocoee Supergroup, NC–TN: dating diagenetic xenotime and monazite overgrowths on detrital minerals to determine the age of sedimentary deposition

John N. Aleinikoff, Scott Southworth, C. Mark Fanning
Published: 01 February 2023
Canadian Journal of Earth Sciences (2023) 60 (6): 583–615.
DOI: https://doi.org/10.1139/cjes-2022-0093
...Fig. 15. Age data for xenotime and monazite from the Thunderhead Sandstone (sample x9-02-3). (A) Green ellipses ( n  = 17) record the time of diagenetic formation of xenotime (see inset of weighted average of 207 Pb/ 206 Pb ages). Blue ellipses record a younger event, probably metamorphic...
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Journal Article

STRATIGRAPHY OF OCOEE SERIES, GREAT SMOKY MOUNTAINS, TENNESSEE AND NORTH CAROLINA

PHILIP B KING, JARVIS B HADLEY, ROBERT B NEUMAN, WARREN HAMILTON
Journal: GSA Bulletin
Published: 01 August 1958
GSA Bulletin (1958) 69 (8): 947–966.
DOI: https://doi.org/10.1130/0016-7606(1958)69[947:SOOSGS]2.0.CO;2
... than 25,000 feet thick. The lower part, termed the Elkmont sandstone, is fine-grained sandstone. The middle part, termed the Thunderhead sandstone, is poorly sorted, coarse, feldspathic sandstone in graded beds. The upper part, termed the Anakeesta formation, includes many beds of dark argillaceous...
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Journal Article

Chemical and Mineralogical Variations during Prograde Metamorphism, Great Smoky Mountains, North Carolina and Tennessee

GARY C ALLEN, PAUL C RAGLAND
Journal: GSA Bulletin
Published: 01 May 1972
GSA Bulletin (1972) 83 (5): 1285–1298.
DOI: https://doi.org/10.1130/0016-7606(1972)83[1285:CAMVDP]2.0.CO;2
...GARY C ALLEN; PAUL C RAGLAND Abstract Chemical and mineralogic variations during prograde regional metamorphism were studied in meta-arkoses of the Thunderhead Sandstone of the Great Smoky Mountains, North Carolina and Tennessee. Twelve localities along a profile normal to the regional isograds...
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BSE images of detrital zircon (gray) and xenotime overgrowths (white). Whit...

BSE images of detrital zircon (gray) and xenotime overgrowths (white). Whit...

Published: 01 February 2023
Fig. 12. BSE images of detrital zircon (gray) and xenotime overgrowths (white). White-filled red ellipses show locations of SHRIMP spots. Data shown adjacent to ellipses are 207 Pb/ 206 Pb ages (in Ma); errors are ± 1σ. (A) Thunderhead Sandstone. (B) Cades Sandstone. Note the significantly
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Trace element data for xenotime overgrowths from units of the Ocoee Supergr...

Trace element data for xenotime overgrowths from units of the Ocoee Supergr...

Published: 01 February 2023
Fig. 17. Trace element data for xenotime overgrowths from units of the Ocoee Supergroup. (A) REE plot of xenotime from Thunderhead Sandstone. Data for black curves (∼560 Ma) and pink curves (∼400 Ma). (B) REE plot of xenotime from Cades Sandstone. Diagenetic xenotime (black curves) does not show
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Geology and sample locations. (A) Simplified geologic map of western North ...

Geology and sample locations. (A) Simplified geologic map of western North ...

Published: 01 February 2023
(Longarm Quartzite), 2—x9-02-5 (Roaring Fork Sandstone), 3—x9-02-4 (Elkmont Sandstone), 4—x9-02-2 (Cades Sandstone), 5—x9-02-3 (Thunderhead Sandstone), 6—x9-02-7 (Wehutty Formation), 7—x9-02-1 (Shields Formation), 8—4Ss-B (Sandsuck Formation), 9—WC-2–04 (Cochran Formation), 10—MZ-3 (muscovite-graphite
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Trace element data for monazite cores and overgrowths from the <span class="search-highlight">Thunderhead</span> ...

Trace element data for monazite cores and overgrowths from the Thunderhead ...

Published: 01 February 2023
Fig. 18. Trace element data for monazite cores and overgrowths from the Thunderhead Sandstone. (C–E) Red, green, and blue fields from high-temperature monazite of igneous origin ( Aleinikoff et al. 2012 ). (A) REE plot of detrital monazite cores showing large negative Eu anomalies, similar to REE
Journal Article

Provenance of the Lower Ocoee Supergroup, eastern Great Smoky Mountains

Suvankar Chakraborty, David P. Moecher, Scott D. Samson
Journal: GSA Bulletin
Published: 01 July 2012
GSA Bulletin (2012) 124 (7-8): 1278–1292.
DOI: https://doi.org/10.1130/B30578.1
... feldspathic sandstones. The Thunderhead Sandstone is coarse-grained, feldspathic sandstone to conglomerate with thick, locally graded beds, interbedded with thin argillaceous siltstone to shale beds. We sampled only thick, coarse-grained sandstone beds of the Thunderhead Formation for this study...
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Journal Article

Using an Inventory of Unstable Slopes to Prioritize Probabilistic Rockfall Modeling and Acid-Base Accounting in Great Smoky Mountains National Park

Thomas O'Shea, Samantha Farmer, Arpita Nandi, Eric Bilderback, Ingrid Luffman, Andrew Joyner
Published: 28 March 2023
Environmental & Engineering Geoscience (2023) 29 (2): 73–91.
DOI: https://doi.org/10.2113/EEG-D-22-00063
.... The majority (72 percent) of unstable slopes were identified along three main roads in the park: Routes 0014 (Little River Gorge Road), 0010 N (Newfound Gap Road), and 0011 N, S (Gatlinburg Spur Road). Of these, 32 percent were located along Route 0014 in the Metcalf Phyllite, Cades Sandstone, and Thunderhead...
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Journal Article

Beyond Zircon: Incorporating Detrital Feldspar Pb Isotope Analysis into the Multiproxy Toolbox for Sedimentary Provenance Analysis—an Example from a Long-Lived Eastern Laurentian Clastic System

David P. Moecher, Eszter Badenszki, J. Stephen Daly, David Chew
Published: 01 November 2022
The Journal of Geology (2022) 130 (6): 429–445.
DOI: https://doi.org/10.1086/724287
... to composite age distributions for the late Neoproterozoic Ocoee Supergroup and early Cambrian sandstones ( fig. 2 A ). The likeness value (after Satkoski et al. 2013 ) between the Grundy and the Ocoee is 89%, higher than any pair of likeness values for the four samples comprising the Grundy Formation...
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Photomicrographs and backscattered electron image (BSE) illustrating minera...

Photomicrographs and backscattered electron image (BSE) illustrating minera...

Published: 01 July 2012
Figure 3. Photomicrographs and backscattered electron image (BSE) illustrating mineralogy and textures of feldspathic Ocoee siltstones and sandstones. In A–D, the photo on the left is plane light; the photo on the right is crossed polars. (A) Thunderhead Formation; (B) Pigeon Formation; (C
Journal Article

Reinterpretation of the Greenbrier fault, Great Smoky Mountains: New petrofabric constraints and implications for southern Appalachian tectonics

K.M. Clemons, D.P. Moecher
Journal: GSA Bulletin
Published: 01 July 2009
GSA Bulletin (2009) 121 (7-8): 1108–1122.
DOI: https://doi.org/10.1130/B26480.1
... in Pigeon and Roaring Fork Formations below garnet grade is transposed along steeply dipping, planar, spaced shear bands (S 3 ) ( Fig. 9 ). In Rich Butt sandstone at garnet grade, S 3 is characterized by kinking of biotite poikiloblasts ( Figs. 7D , 7E , and 9B ), and by being folded and deflected around...
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Application of a Hydrological Model for Estimating Infiltration for Debris Flow Initiation: A Case Study from the Great Smoky Mountains National Park, Tennessee

Arpita Mandal, Arpita Nandi, Abdul Shakoor, Jeffrey Keaton
Published: 21 February 2022
Environmental & Engineering Geoscience (2022) 28 (1): 93–111.
DOI: https://doi.org/10.2113/EEG-D-21-00013
... of late Precambrian age, consisting of primarily Thunderhead Sandstone and Anakeesta Formation ( Bogucki, 1976 ) ( Figure 3 ). The Thunderhead Sandstone consists of conglomerate and coarse-grained meta-sandstone inter-bedded with graphitic meta-siltstone and slate. The Anakeesta Formation contains...
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Journal Article

Paleozoic age of the Walden Creek Group, Ocoee Supergroup, in the western Blue Ridge, southern Appalachians: Implications for evolution of the Appalachian margin of Laurentia

Raphael Unrug, William I. Ausich, Jolanta Bednarczyk, Roger J. Cuffey, Bernard L. Mamet, Steven L. Palmes, Sophia Unrug
Journal: GSA Bulletin
Published: 01 July 2000
GSA Bulletin (2000) 112 (7): 982–996.
DOI: https://doi.org/10.1130/0016-7606(2000)112<982:PAOTWC>2.0.CO;2
... Group is made of massive and graded conglomeratic to medium-grained, thick-bedded to very thick-bedded feldspathic wackes of the Thunderhead Sandstone and related units and fine-grained black pyritic shales of the Anakeesta Formation ( Woelfer, 1989 ). The Walden Creek Group overlies the Great Smoky...
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Book Chapter

CASE HISTORIES

Author(s)
Philip G. Hallof, Mitsuru Yamashita, J.C. Wynn, A.E. Grosz, V. L. Carlson-Foscz, K.E. Witherly, J. Vyselaar, Philip G. Haliof, Ben K. Sternberg, Dorothy Z. Oehler, Pál Draskovits, József Hobot, László Verö, Bruce D. Smith, Robert Anderson, Bruce Bell, John Reynolds
Book: Induced Polarization: Applications and Case Histories
Publisher: Society of Exploration Geophysicists
Published: 01 January 1990
DOI: 10.1190/1.9781560802594.ch3
EISBN: 9781560802594
... is underlain by the Great Smokey group which is itself further subdivided into three major formations. These are, from oldest to youngest, the Elkmont sandstone, the Thunderhead sandstone, and the Anakeesta formation. Due to the lack of detailed geologic mapping, it is unclear if all of these formations...
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Most gold deposits discovered in Canada in recent years are associated with metallic sulfide mineralization. These relatively small deposits require careful detailing of the weakest of detectable induced polarization (IP) response. This requirement puts constraints on the design and conduct of gold exploration programs using the IP/resistivity method. A study of a suite of known gold bearing deposits using IP/resistivity techniques is presented. These case histories and examples of computer models reflecting these deposits indicate the need to consider carefully the survey parameters when exploring for relatively small low-grade sulfide targets.