Recognition of Regional (Eustatic?) and Local (Tectonic?) Relative Sea-Level Events in Outcrop and Gamma-Ray Logs, Ordovician, West Virginia

Diecchio, Richard J.; Brodersen, Brett T.

doi:10.2110/csp.94.04.0171

Cited by 7 publications

(7 citation statements)

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“…The amplitudes of the sea-level oscillations indicate that the late Campanian-Maastrichtian sequence boundaries in the Anambra Basin are more deeply incised than the corresponding sequence boundaries on the Haq et al (1988) sea-level chart. This suggests that local basin subsidence played a major role in determining the depth of the incisions (Diecchio and Brodersen, 1994;Ardies et al, 2002). The progressive southwestward migration of the depocentre and basin axis, and the pattern of regional facies changes within the cycles discussed in this paper, are consistent with differential basin subsidence.…”

Section: Discussionsupporting

confidence: 69%

Sedimentary response to tectonism in the Campanian–Maastrichtian succession, Anambra Basin, Southeastern Nigeria

Obi¹,

Okogbue²

2004

Journal of African Earth Sciences

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Section: Discussionsupporting

confidence: 69%

Sedimentary response to tectonism in the Campanian–Maastrichtian succession, Anambra Basin, Southeastern Nigeria

Obi¹,

Okogbue²

2004

Journal of African Earth Sciences

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“…earliest Silurian. Finally, correlation of global sea level inferred from cumulative aggradation plots and gamma ray logs of the Juniata Formation has revealed that the upper Juniata Formation is Hirnantian (Diecchio and Broderson 1994;Diecchio 1995) and thus correlative with global marine regression and glaciation in Saharan Africa (Le Heron and Craig 2008;Ghienne et al 2014).…”

Section: Geological Setting Of Appalachian Ordovician Paleosolsmentioning

confidence: 99%

Late Ordovician Glaciation Initiated by Early Land Plant Evolution and Punctuated by Greenhouse Mass Extinctions

Retallack

2015

The Journal of Geology

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Late Ordovician (Hirnantian) glaciation, indicated by periglacial paleosols, tillites, and glacial pavements in Saharan Africa, has been attributed to advances in weathering and carbon sequestration due to evolution of early land plants, in the same way that Devonian-Permian glaciation has been attributed to evolution of forests and Quaternary glaciations to evolution of grasslands. Two problems for carbon cycle explanations of this glaciation are an Hirnantian CO 2 greenhouse estimated at 4035 ppmv from mass balance models and possibly related Hirnantian mass extinctions. This estimate of high CO 2 is a 10-m.yr. average, here evaluated against high-resolution sequences of paleosols that give estimates not only of CO 2 but also of paleoclimate and vegetation through the Late Ordovician. Katian paleosols of the eastern United States show increases in depth and in degree of carbon consumption and storage comparable with those preceding glaciation of the Devonian-Permian and Quaternary. Early thalloid land plants with rhizoids may have drawn down atmospheric CO 2 to only 166 5 83 ppmv during the Hirnantian, as estimated here from a pedogenic CO 2 paleobarometer. Ordovician paleosols also reveal a short-term greenhouse spike to as much as 4670 ppmv immediately before Hirnantian glaciation. This greenhouse spike may be due to thermogenic methane release from a large igneous province and is comparable with greenhouse spikes during other mass extinctions, such as those of the Late Permian and Late Jurassic.

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“…Only selected unconformities are shown on cross section E-E′. Regional unconformities shown on section E-E′ and in figure 2 include the Middle Ordovician (Knox) unconformity (Harris and Repetski, 1982;Mussman and others, 1988), the Upper Ordovician-Lower Silurian Cherokee unconformity (Dennison and Head, 1975;Diecchio and Brodersen, 1994), the Middle-Upper Devonian unconformity (de Witt and others, 1993), and the Lower Pennsylvanian unconformity (Arkle and others, 1979;Beuthin, 1994). The correlation of these unconformities with North American sequences of Sloss (1988) is shown in figure 2 and by Swezey (2002).…”

Section: Construction Of the Cross Sectionmentioning

confidence: 99%

Geologic Cross Section E-E' through the Appalachian Basin from the Findlay Arch, Wood County, Ohio, to the Valley and Ridge Province, Pendleton County, West Virginia

Ryder¹,

Swezey²,

Crangle³

et al. 2008

Scientific Investigations Map

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The correlation of stratigraphic intervals between drill holes was based on a variety of geophysical (wireline) and lithologic logs. The most commonly used geophysical logs were the gamma-ray-neutron and gamma-ray-density log suites, and the most commonly used lithologic logs were those produced by the Geological Sample Log Company (table 1; Appendix B). Gamma-ray logs used for correlations were digitized as Log ASCII files (LAS), converted to graphic images, and then plotted next to their respective drill holes (Crangle, 2007). The lithology assigned to each stratigraphic interval was simplified to just a few rock types and lithologic modifiers. The topographic profile for the cross section was created from a Shuttle Radar Topography Mission (SRTM) 90-meter (m)grid digital elevation model (DEM) for parts of Ohio,

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Recognition of Regional (Eustatic?) and Local (Tectonic?) Relative Sea-Level Events in Outcrop and Gamma-Ray Logs, Ordovician, West Virginia

Cited by 7 publications

References 0 publications

Sedimentary response to tectonism in the Campanian–Maastrichtian succession, Anambra Basin, Southeastern Nigeria

Sedimentary response to tectonism in the Campanian–Maastrichtian succession, Anambra Basin, Southeastern Nigeria

Late Ordovician Glaciation Initiated by Early Land Plant Evolution and Punctuated by Greenhouse Mass Extinctions

Geologic Cross Section E-E' through the Appalachian Basin from the Findlay Arch, Wood County, Ohio, to the Valley and Ridge Province, Pendleton County, West Virginia

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