Matches in SemOpenAlex for { <https://semopenalex.org/work/W320417985> ?p ?o ?g. }
Showing items 1 to 74 of
74
with 100 items per page.
- W320417985 abstract "Isotopic analyses were performed on well preserved shells of the brachiopod Crurithyris planoconvexa from the Necessity and Colony Creek Shales on the eastern shelf of the Midland Basin in an attempt to relate isotopic shifts to transgression and regression. Petrographic and chemical techniques were used to ensure the preservation of the original shell chemistry. Thin sections of the pedicle valve viewed under cathodoluminescence exhibit orange luminescence only in a thin band around the perimeter of the valve which precisely encompasses the primary shell layer where present. Energy dispersive micro-analysis reveals iron concentrations of about 1-3% in the luminescent primary layer of shells, and no detectable iron in non-luminescent secondary layer. The secondary layers in the shells analyzed have average compositions of -2.7 and 2.5% for delta/sup 18/O and delta/sup 13/C, respectively. The delta/sup 18/O value corresponds to a paleotemperature of 29/sup 0/C, assuming 0%/sub 0/ for the composition of the water. The diagenetically altered primary layers are depleted in delta/sup 18/O and delta/sup 13/C relative to the secondary layers by averages of 1.4% and 2.9%, respectively. The /sup 18/O compositions of the secondary layer from Necessity Shale brachiopods are on the average 0.7-0.8% lower in the deeper-water intervals of the more » section, as defined by the presence of phosphate nodules, abundant ammonoids, and higher diversity. The inverse relationship between delta/sup 18/O and depth suggests that the isotopic shifts may reflect changes in global ice volume. « less" @default.
- W320417985 created "2016-06-24" @default.
- W320417985 creator A5072906258 @default.
- W320417985 date "1986-01-01" @default.
- W320417985 modified "2023-09-27" @default.
- W320417985 title "Stable isotope variations in Late Pennsylvanian brachiopods from cyclic sedimentary deposits: paleoenvironmental and diagenetic implications" @default.
- W320417985 hasPublicationYear "1986" @default.
- W320417985 type Work @default.
- W320417985 sameAs 320417985 @default.
- W320417985 citedByCount "0" @default.
- W320417985 crossrefType "journal-article" @default.
- W320417985 hasAuthorship W320417985A5072906258 @default.
- W320417985 hasConcept C109007969 @default.
- W320417985 hasConcept C121332964 @default.
- W320417985 hasConcept C127313418 @default.
- W320417985 hasConcept C127413603 @default.
- W320417985 hasConcept C130452526 @default.
- W320417985 hasConcept C146978453 @default.
- W320417985 hasConcept C151730666 @default.
- W320417985 hasConcept C153127940 @default.
- W320417985 hasConcept C164304813 @default.
- W320417985 hasConcept C17409809 @default.
- W320417985 hasConcept C199289684 @default.
- W320417985 hasConcept C22117777 @default.
- W320417985 hasConcept C2779650180 @default.
- W320417985 hasConcept C5072461 @default.
- W320417985 hasConcept C59235061 @default.
- W320417985 hasConcept C62520636 @default.
- W320417985 hasConcept C6494504 @default.
- W320417985 hasConceptScore W320417985C109007969 @default.
- W320417985 hasConceptScore W320417985C121332964 @default.
- W320417985 hasConceptScore W320417985C127313418 @default.
- W320417985 hasConceptScore W320417985C127413603 @default.
- W320417985 hasConceptScore W320417985C130452526 @default.
- W320417985 hasConceptScore W320417985C146978453 @default.
- W320417985 hasConceptScore W320417985C151730666 @default.
- W320417985 hasConceptScore W320417985C153127940 @default.
- W320417985 hasConceptScore W320417985C164304813 @default.
- W320417985 hasConceptScore W320417985C17409809 @default.
- W320417985 hasConceptScore W320417985C199289684 @default.
- W320417985 hasConceptScore W320417985C22117777 @default.
- W320417985 hasConceptScore W320417985C2779650180 @default.
- W320417985 hasConceptScore W320417985C5072461 @default.
- W320417985 hasConceptScore W320417985C59235061 @default.
- W320417985 hasConceptScore W320417985C62520636 @default.
- W320417985 hasConceptScore W320417985C6494504 @default.
- W320417985 hasLocation W3204179851 @default.
- W320417985 hasOpenAccess W320417985 @default.
- W320417985 hasPrimaryLocation W3204179851 @default.
- W320417985 hasRelatedWork W1974045235 @default.
- W320417985 hasRelatedWork W1981687253 @default.
- W320417985 hasRelatedWork W2038952356 @default.
- W320417985 hasRelatedWork W2040239638 @default.
- W320417985 hasRelatedWork W2045890461 @default.
- W320417985 hasRelatedWork W2046405249 @default.
- W320417985 hasRelatedWork W2051773313 @default.
- W320417985 hasRelatedWork W2053883873 @default.
- W320417985 hasRelatedWork W2054374364 @default.
- W320417985 hasRelatedWork W2076327546 @default.
- W320417985 hasRelatedWork W2102504579 @default.
- W320417985 hasRelatedWork W2143124345 @default.
- W320417985 hasRelatedWork W2186621088 @default.
- W320417985 hasRelatedWork W2273215098 @default.
- W320417985 hasRelatedWork W24790172 @default.
- W320417985 hasRelatedWork W2685164612 @default.
- W320417985 hasRelatedWork W2951062081 @default.
- W320417985 hasRelatedWork W2952143199 @default.
- W320417985 hasRelatedWork W3043612914 @default.
- W320417985 hasRelatedWork W3178011200 @default.
- W320417985 hasVolume "17" @default.
- W320417985 isParatext "false" @default.
- W320417985 isRetracted "false" @default.
- W320417985 magId "320417985" @default.
- W320417985 workType "article" @default.