Rhenium–osmium isotope and platinum group element systematics of marine vs. non-marine organic-rich sediments and coals from Egypt

Baioumy, Hassan; Eglinton, L.B.; Peucker‐Ehrenbrink, Bernhard

doi:10.1016/j.chemgeo.2011.02.026

Cited by 45 publications

(35 citation statements)

References 57 publications

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“…Although elevated Os concentrations are observed (over 5 ng/g), they are not remarkable in that they are within the range of values observed in other black shale; the Re concentrations of up to 1.2 μg/g, however, are unusual. Previous work on similar coal-associated, marine black shale has shown Re concentrations reaching no higher than~0.42 μg/g (Baioumy et al, 2011). This extreme enrichment of Re results in the unusually high 187 Re/ 188 Os ratios observed in Table 2 and Fig.…”

Section: Re-os Fractionation In the Betsie Shale Membermentioning

confidence: 57%

Re–Os age for the Lower–Middle Pennsylvanian Boundary and comparison with associated palynoflora

Geboy

Tripathy

Ruppert

et al. 2015

International Journal of Coal Geology

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The Betsie Shale Member is a relatively thick and continuous unit that serves as a marker bed across the central Appalachian basin, in part because it includes an organic-rich shale unit at its base that is observable in drill logs. Deposited during a marine transgression, the Betsie Shale Member has been correlated to units in both Wales and Germany and has been proposed to mark the boundary between the Lower and Middle Pennsylvanian Series within North America. This investigation assigns a new Re-Os date to the base of the Betsie and examines the palynoflora and maceral composition of the underlying Matewan coal bed in the context of that date. The Matewan coal bed contains abundant lycopsid tree spores along its base with assemblage diversity and inertinite content increasing upsection, as sulfur content and ash yield decrease. Taken together, these palynologic and organic petrographic results suggest a submerged paleomire that transitioned to an exposed peat surface. Notably, separating the lower and upper benches of the Matewan is a parting with very high sulfur content (28 wt.%), perhaps representing an early marine pulse prior to the full on transgression responsible for depositing the Betsie. Results from Re-Os geochronology date the base of the Betsie at 323 ± 7.8 Ma, consistent with previously determined age constraints as well as the palynoflora assemblage presented herein. The Betsie Shale Member is also highly enriched in Re (ranging from 319.7 to 1213 ng/g), with high 187 Re/ 188 Os values ranging from 3644 to 5737 likely resultant from varying redox conditions between the pore water and overlying water column during deposition and early condensing of the section.Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Section: Re-os Fractionation In the Betsie Shale Membermentioning

confidence: 57%

Re–Os age for the Lower–Middle Pennsylvanian Boundary and comparison with associated palynoflora

Geboy

Tripathy

Ruppert

et al. 2015

International Journal of Coal Geology

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“…Although attributing the higher Re and Os concentrations in the Phosphoria samples relative to the Staffin samples to the preservation of chelating precursors or prolonged open pore-water systems remains equivocal, it should be noted that Re and Os concentrations in coals which are predominantly Type III kerogen, are typically <1 ng/g (Orem and Finkelman, 2003;Baioumy et al, 2011). This suggests that Type III kerogen may not retain the needed organic chelating sites for preferentially binding Re and Os.…”

Section: Complexation Behaviour and Location Of Re And Os In Orsmentioning

confidence: 88%

Evaluating Re–Os systematics in organic-rich sedimentary rocks in response to petroleum generation using hydrous pyrolysis experiments

Rooney

Selby

Lewan

et al. 2012

Geochimica et Cosmochimica Acta

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“…Thus values for this sample suite are ~600 ppt, whereas the highest values published from any other sample are only about one-half of that, or ~300 ppt, as represented by 192 Os (sample suite I-1; Table 3: page 299). This could be due to the more efficient uptake of Os into organic matter; the higher preservation of organic matter past the sediment-water interface which allowed for more authigenic enrichment of Os; an increased supply in Os due to oxidative weathering of Os-rich minerals; or a combination of these factors (Ravizza and Esser, 1993;Selby and Creaser, 2003;Baioumy et al, 2011;Cumming et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Constraining the Timing and Depositional Conditions of the Maikop Formation Within the Kura Basin, Eastern Azerbaijan, Through the Application of Re‐os Geochronology and Chemostratigraphy

Washburn

Hudson

Selby

et al. 2019

Journal of Petroleum Geology

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The Oligocene -Miocene Maikop Formation is the key source rock in the South Caspian and Kura Basins. The Maikop is composed of a thick (up to 3 km) succession of clay-rich mudstones containing up to 15% total organic carbon (TOC). Despite decades of study, the mudstones often lack precise age control -Maikop strata rarely contain diagnostic microfaunal assemblages which can be used for dating, stratigraphic correlation, or constraining the depositional setting. Using rhenium-osmium geochronology, this study adds important numerical age data for the Maikop Formation. Of five sample suites analysed from the Kura Basin, eastern Azerbaijan, one Re-Os data-set produced a significant range in 187 Re/ 188 Os versus 187 Os/ 188 Os space to yield an isochron of 17.2 ± 3.2 Ma (Early Miocene). Other sample suites yielded imprecise Re-Os age constraints as a result of variable initial 187 Os/ 188 Os values and a limited range in 187 Re/ 188 Os versus 187 Os/ 188 Os space. The initial 187

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Rhenium–osmium isotope and platinum group element systematics of marine vs. non-marine organic-rich sediments and coals from Egypt

Cited by 45 publications

References 57 publications

Re–Os age for the Lower–Middle Pennsylvanian Boundary and comparison with associated palynoflora

Re–Os age for the Lower–Middle Pennsylvanian Boundary and comparison with associated palynoflora

Evaluating Re–Os systematics in organic-rich sedimentary rocks in response to petroleum generation using hydrous pyrolysis experiments

Constraining the Timing and Depositional Conditions of the Maikop Formation Within the Kura Basin, Eastern Azerbaijan, Through the Application of Re‐os Geochronology and Chemostratigraphy

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