Reflected light microscopy and micro-FTIR of Upper Ordovician Gloeocapsomorpha prisca alginite in relation to paleoenvironment and petroleum generation, Saskatchewan, Canada

Stasiuk, Lavern D.; Kybett, Brian D.; Bend, Stephen L.

doi:10.1016/0146-6380(93)90056-h

Cited by 26 publications

(19 citation statements)

References 24 publications

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“…This decoupling is incompatible with the suggestions of some authors that G. prisca inhabited benthic environments (Reed et al, 1986;Foster et al, 1990;Stasiuk et al, 1993), because shifting dissolved carbon δ 13 C compositions in the benthic water mass should also have been sensed by brachiopods in the Decorah. Because the processes responsible for the positive δ 13 C excursion apparently were not operant on the sea floor, origination in a photic surface layer provides a simple logical alternative.…”

Section: Interpretation Of Depositional Processescontrasting

confidence: 80%

“…In addition, the organic-rich strata containing the positive δ 13 C excursion contain abundant remains of the extinct organic-walled microfossil Gloeocapsomorpha prisca (Jacobson et al, 1988). The biologic affinity and paleoenvironmental significance of G. prisca has been controversial (Reed et al, 1986;Hoffman et al, 1987;Jacobson et al, 1988;Stasiuk and Osadetz, 1990;Foster et al, 1990;Stasiuk et al, 1993); arguments have been advanced for existence as a phytoplanktic organism or as a benthic heterotroph.…”

Section: Introductionmentioning

confidence: 99%

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Carbonate component chemostratigraphy and depositional history of the Ordovician Decorah Formation, Upper Mississippi Valley

Ludvigson¹,

Jacobson²,

Witzke³

et al. 1996

Paleozoic Sequence Stratigraphy; Views From the North American Craton

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The Decorah Formation of eastern Iowa was deposited on an open-marine subtidal shelf near storm wave base. Maximum transgression is represented in organic-rich strata of the Guttenberg Member. Brachiopod-derived marine carbonate isotopic compositions from the Decorah are approximately δ 13 C = +1‰ and δ 18 O = -3.5‰; these data are consistent with a recently recognized long-term secular increase in the δ 18 O of Middle Ordovician marine carbonates. Decorah carbonates lithified in early diagenetic modified-marine phreatic environments. Isotopic data from diagenetic components show that the Spechts Ferry Member lithified in a more fluid-dominated diagenetic system than the immediately overlying Guttenberg Member, which was characterized by a rock-dominated system. Whole-rock carbonate δ 13 C shifts in the Decorah Formation are carried by micritic components. A positive shift in the Guttenberg to micrites with δ 13 C values up to +2.5‰ indicates that some of the micrite isotopic signal is primary and not of benthic origin and/or that early diagenetic marine phreatic fluids in the organic-rich Guttenberg were affected by bacterial methanogenesis. Subtidal shallowing-upward depositional cycles in the Decorah are internally characterized by micrites with stratigraphically upward trends toward 13 C depletion as a consequence of increasing diagenetic water/rock ratios. Decoupling between coeval carbon isotopic signals carried by open-marine brachiopod carbonate and those of organic carbon and micrite indicates that the positive carbon isotopic excursion in the Guttenberg resulted from an episode of increased photosynthetic productivity near the sea surface. This event was a consequence of quasiestuarine circulation associated with marine transgression during deposition of the Guttenberg Member. Results from this study suggest that the extinct organic-walled microfossil Gloeocapsomorpha prisca, the principal source of organic carbon in the Decorah Formation, was a phytoplanktic organism.

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Section: Interpretation Of Depositional Processescontrasting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Carbonate component chemostratigraphy and depositional history of the Ordovician Decorah Formation, Upper Mississippi Valley

Ludvigson¹,

Jacobson²,

Witzke³

et al. 1996

Paleozoic Sequence Stratigraphy; Views From the North American Craton

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show abstract

“…Pyrolysis experiments on kerogen or oils can effectively simulate the evolution of hydrocarbon gases and allows the abundance and stable carbon isotopic composition of the gas products to be monitored (Behar et al, 1997;Seewald et al, 1998;Hill et al, 2003). Gloeocapsomorpha prisca, typically via Kukersite shales, has made a huge contribution to Ordovician source rocks all over the world (Stasiuk et al, 1993;Fowler et al, 2004), including in the Tarim Basin (Pu et al, 1998). Thus, immature and readily oil prone Kukersite kerogen has been used in several laboratory thermal treatment studies concerned with respective significance of kerogen versus oil.…”

Section: Introductionmentioning

confidence: 99%

Gas evolution during kerogen pyrolysis of Estonian Kukersite shale in confined gold tube system

Wang

Lü

Greenwood

et al. 2013

Organic Geochemistry

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“…However, only a few studies have applied reflectance micro-FTIR to the qualitative or semi-quantitative characterization of coal [33][34][35][36][37][38]. To the best of our knowledge, no research has been reported about employing micro-FTIR for quantitative characterization of shales at a microscopic level [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of shales by KBr-FTIR and micro-FTIR

Chen

Furmann

Mastalerz

et al. 2014

Fuel

132

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Reflected light microscopy and micro-FTIR of Upper Ordovician Gloeocapsomorpha prisca alginite in relation to paleoenvironment and petroleum generation, Saskatchewan, Canada

Cited by 26 publications

References 24 publications

Carbonate component chemostratigraphy and depositional history of the Ordovician Decorah Formation, Upper Mississippi Valley

Carbonate component chemostratigraphy and depositional history of the Ordovician Decorah Formation, Upper Mississippi Valley

Gas evolution during kerogen pyrolysis of Estonian Kukersite shale in confined gold tube system

Quantitative analysis of shales by KBr-FTIR and micro-FTIR

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