Mackey, Justin
(2017)
A CHEMOSTRATIGRAPHIC STUDY OF REGIONAL AND GLOBAL CONTROLS ON DEPOSITION AND PRESERVATION OF LATE CAMBRIAN SHALES AND CARBONATES OF THE CONASAUGA GROUP, APPALACHIAN BASIN, USA.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
This study reports data from the Late Cambrian Conasauga Group and overlying Copper Ridge Formation of the Central Appalachian region, eastern U.S.A. Geochemical, macro-, and micro-scale analysis of core material from southeastern Ohio was carried out to constrain the extent of oceanic anoxia and to characterize sediment fluxes on the carbonate platform and continental shelf of Laurentia contemporaneous with the Steptoean Positive Carbon Isotope Excursion (SPICE), a Late Cambrian global marine anoxic event. Carbonate sediments (primarily dolomite) record a positive δ13Ccarb excursion starting in the middle Nolichucky Formation, reaching its peak (+4.3) at the boundary between the Maynardville and Copper Ridge Formations. Strontium isotope ratios in the dolomitic units are only slightly offset from the expected Cambrian seawater values, suggesting minimal post-diagenetic disturbance of isotopic and trace element systematics. Elemental ratios within the lower Nolichucky Shale facies, including Th/U, FeT/Al, and Ce/Ce* anomalies, suggest an anoxic water column contemporaneous with the start of the δ13Ccarb excursion. Selective leaching of carbonate sediments reveal trends in redox-sensitive trace metals (e.g., U, Ni, V) indicative of regional and global marine anoxia during the peak of the Late Cambrian SPICE event.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
15 June 2017 |
| Date Type: |
Publication |
| Defense Date: |
23 March 2017 |
| Approval Date: |
15 June 2017 |
| Submission Date: |
27 April 2017 |
| Access Restriction: |
1 year -- Restrict access to University of Pittsburgh for a period of 1 year. |
| Number of Pages: |
68 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Geology and Planetary Science |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Chemostratigraphy, carbonate geochemistry, petroleum, shale, hydrocarbon, anoxia, paleoceanography, stratigaphy, sedimentology, isotope. carbon cycle, strontium, appalachian basin, ohio, conasauga group |
| Date Deposited: |
15 Jun 2017 23:03 |
| Last Modified: |
15 Jun 2018 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/31558 |
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