Matches in SemOpenAlex for { <https://semopenalex.org/work/W1966019019> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W1966019019 endingPage "254" @default.
- W1966019019 startingPage "243" @default.
- W1966019019 abstract "In order to provide a time constraint on the 13C-depleted kerogen formation in silica dikes that intruded 3.5 Ga greenstone from Pilbara Craton in Western Australia, we have carried out an ion microprobe U-Pb dating and rare earth element (REE) analysis of apatite from one of the dikes. Two types of apatite were identified in the dike, based on their occurrences. One is stick-shape apatites (Type 1 apatite) in secondary silica micro-veins that cut the silica dike. The other is granular apatites (Type 2 apatite) that occur in matrix of the silica dike. Occurrence in the secondary micro-veins (Type 1), non-igneous REE patterns (Type 1 and 2), chemical zoning (some of Type 1 and 2), iron sulfide within apatite (some of Type 2), and intergrowth of apatite and sulfide (some of Type 2) suggest that both types of apatite were crystallized in the silica dike. Ion microprobe U-Pb dating of Type 1 apatite did not give a well-constrained age, while Type 2 apatite yields a Tera-Wasserburg concordia intercept age of 3214 ± 140 Ma (95% confidence level, MSWD = 0.6) in a three-dimensional 238U/206Pb-207Pb/206Pb-204Pb/206Pb diagram, and a 204Pb/206Pb-207Pb/206Pb isochron age of 3191 ± 150 Ma (95% confidence level, MSWD = 0.5). It is difficult to judge whether the U-Pb and Pb-Pb age of Type 2 apatite is crystallization age or metamorphic age, since the estimated range of closure temperature of U-Pb system in the apatite and that of metamorphic temperature is partly overlapped. In either case, it can be safely concluded that the minimum age of the dike and kerogen is 3.2 Ga. These ages might allow the interpretation that the kerogen was produced by biological carbon fixation and/or abiological reaction at least before 3.2 Ga." @default.
- W1966019019 created "2016-06-24" @default.
- W1966019019 creator A5002155845 @default.
- W1966019019 creator A5048888176 @default.
- W1966019019 creator A5074836720 @default.
- W1966019019 creator A5075648208 @default.
- W1966019019 date "2004-01-01" @default.
- W1966019019 modified "2023-10-05" @default.
- W1966019019 title "Ion microprobe U-Pb dating and REE analysis of apatite from kerogen-rich silica dike from North Pole area, Pilbara Craton, Western Australia" @default.
- W1966019019 cites W1964759069 @default.
- W1966019019 cites W1974944153 @default.
- W1966019019 cites W1982178820 @default.
- W1966019019 cites W1987534898 @default.
- W1966019019 cites W1993068935 @default.
- W1966019019 cites W2004710177 @default.
- W1966019019 cites W2011763496 @default.
- W1966019019 cites W2026412695 @default.
- W1966019019 cites W2027209394 @default.
- W1966019019 cites W2035662349 @default.
- W1966019019 cites W2044006022 @default.
- W1966019019 cites W2045052900 @default.
- W1966019019 cites W2045916683 @default.
- W1966019019 cites W2047351068 @default.
- W1966019019 cites W2053136811 @default.
- W1966019019 cites W2059722483 @default.
- W1966019019 cites W2069499712 @default.
- W1966019019 cites W2070289634 @default.
- W1966019019 cites W2076161798 @default.
- W1966019019 cites W2117546388 @default.
- W1966019019 cites W2146085530 @default.
- W1966019019 cites W2151122417 @default.
- W1966019019 cites W2290575227 @default.
- W1966019019 cites W2616489980 @default.
- W1966019019 cites W2507301443 @default.
- W1966019019 doi "https://doi.org/10.2343/geochemj.38.243" @default.
- W1966019019 hasPublicationYear "2004" @default.
- W1966019019 type Work @default.
- W1966019019 sameAs 1966019019 @default.
- W1966019019 citedByCount "12" @default.
- W1966019019 countsByYear W19660190192012 @default.
- W1966019019 countsByYear W19660190192014 @default.
- W1966019019 countsByYear W19660190192020 @default.
- W1966019019 countsByYear W19660190192021 @default.
- W1966019019 countsByYear W19660190192022 @default.
- W1966019019 crossrefType "journal-article" @default.
- W1966019019 hasAuthorship W1966019019A5002155845 @default.
- W1966019019 hasAuthorship W1966019019A5048888176 @default.
- W1966019019 hasAuthorship W1966019019A5074836720 @default.
- W1966019019 hasAuthorship W1966019019A5075648208 @default.
- W1966019019 hasBestOaLocation W19660190191 @default.
- W1966019019 hasConcept C127313418 @default.
- W1966019019 hasConcept C140441402 @default.
- W1966019019 hasConcept C17409809 @default.
- W1966019019 hasConcept C199289684 @default.
- W1966019019 hasConcept C2777746296 @default.
- W1966019019 hasConcept C487381 @default.
- W1966019019 hasConcept C67236022 @default.
- W1966019019 hasConcept C83893233 @default.
- W1966019019 hasConceptScore W1966019019C127313418 @default.
- W1966019019 hasConceptScore W1966019019C140441402 @default.
- W1966019019 hasConceptScore W1966019019C17409809 @default.
- W1966019019 hasConceptScore W1966019019C199289684 @default.
- W1966019019 hasConceptScore W1966019019C2777746296 @default.
- W1966019019 hasConceptScore W1966019019C487381 @default.
- W1966019019 hasConceptScore W1966019019C67236022 @default.
- W1966019019 hasConceptScore W1966019019C83893233 @default.
- W1966019019 hasIssue "3" @default.
- W1966019019 hasLocation W19660190191 @default.
- W1966019019 hasOpenAccess W1966019019 @default.
- W1966019019 hasPrimaryLocation W19660190191 @default.
- W1966019019 hasRelatedWork W2005424119 @default.
- W1966019019 hasRelatedWork W2011641058 @default.
- W1966019019 hasRelatedWork W2012063158 @default.
- W1966019019 hasRelatedWork W2042078286 @default.
- W1966019019 hasRelatedWork W2264692938 @default.
- W1966019019 hasRelatedWork W2282707150 @default.
- W1966019019 hasRelatedWork W2374533999 @default.
- W1966019019 hasRelatedWork W2380611893 @default.
- W1966019019 hasRelatedWork W2980926979 @default.
- W1966019019 hasRelatedWork W642107933 @default.
- W1966019019 hasVolume "38" @default.
- W1966019019 isParatext "false" @default.
- W1966019019 isRetracted "false" @default.
- W1966019019 magId "1966019019" @default.
- W1966019019 workType "article" @default.