Matches in SemOpenAlex for { <https://semopenalex.org/work/W2189117004> ?p ?o ?g. }
Showing items 1 to 81 of
81
with 100 items per page.
- W2189117004 endingPage "1048" @default.
- W2189117004 startingPage "1037" @default.
- W2189117004 abstract "Lake O'Hara (subalpine) and Opabin Lake (alpine) are situated directly adjacent to a high section of the Continental Divide in the central Canadian Rocky Mountains. Core samples recovered from the lakes show a consistent stratigraphy comprising gyttja and underlying inorganic clastic sediments. The gyttja contains Bridge River (2350 years BP) and Mazama (6800 years BP) tephras and is separated from the lower clastic sediments by a sharp, conformable contact. Radiocarbon dates obtained from conifer needles, extracted from directly above the contact, indicate that deglaciation had proceeded upvalley from the O'Hara basin priorto ca. 10 100 years BP. Preliminary palaeobotanical and macrofossil data suggest that a Pinus–Abies forest with lesser Picea was established in the vicinity of Lake O'Hara by this time. Consequently, the minimum age of moraine systems situated downvalley from Lake O'Hara is Late Wisconsinan.Mean annual sedimentation rates were derived from sediment thickness data from 14 Lake O'Hara and 2 Opabin Lake cores. Averaged total sedimentation rate values from the Lake O'Hara cores are 0.13 mm/year (post-Bridge River), 0.13 mm/year (Mazama – Bridge River) and 0.05 mm/year (11 000 years BP – Mazama). Averaged total sedimentation rate values from the Opabin Lake cores are 0.19 mm/year (post-Bridge River), 0.07 mm/year (Mazama – Bridge River), and 0.06 mm/year (8530 years BP – Mazama). Higher total sedimentation rates in post-Bridge River sediments of Opabin Lake are presumably related to climatic conditions associated with more extensive upvalley ice during the last ca. 2300 years. Highly variable sedimentation rate data obtained from the Lake O'Hara cores suggest that the use of sedimentation rate data as a proxy record of upvalley glacial activity is inappropriate in the Lake O'Hara setting where inflowing glacial stream systems are interrupted by upvalley lake basins.Aspartic acid D/L ratios were derived from bulk gyttja samples of known age from seven Lake O'Hara and one Opabin Lake core. In all but two cases, aspartic acid D/L ratios increase consistently with respect to sediment age. The increasing downcore trends in the aspartic acid D/L ratios suggest the possibility of using amino acid data from bulk gyttja samples as a check for reworking in cases where chronostratigraphic markers are absent." @default.
- W2189117004 created "2016-06-24" @default.
- W2189117004 creator A5065827442 @default.
- W2189117004 creator A5081948955 @default.
- W2189117004 date "1988-07-01" @default.
- W2189117004 modified "2023-09-26" @default.
- W2189117004 title "Late Quaternary history of the Lake O'Hara region, British Columbia – an evaluation of sedimentation rates and bulk amino acid ratios in lacustrine records" @default.
- W2189117004 doi "https://doi.org/10.1139/e88-101" @default.
- W2189117004 hasPublicationYear "1988" @default.
- W2189117004 type Work @default.
- W2189117004 sameAs 2189117004 @default.
- W2189117004 citedByCount "15" @default.
- W2189117004 countsByYear W21891170042015 @default.
- W2189117004 crossrefType "journal-article" @default.
- W2189117004 hasAuthorship W2189117004A5065827442 @default.
- W2189117004 hasAuthorship W2189117004A5081948955 @default.
- W2189117004 hasConcept C100134115 @default.
- W2189117004 hasConcept C109007969 @default.
- W2189117004 hasConcept C114793014 @default.
- W2189117004 hasConcept C127313418 @default.
- W2189117004 hasConcept C138170599 @default.
- W2189117004 hasConcept C140345934 @default.
- W2189117004 hasConcept C151730666 @default.
- W2189117004 hasConcept C160464908 @default.
- W2189117004 hasConcept C162501224 @default.
- W2189117004 hasConcept C17409809 @default.
- W2189117004 hasConcept C180705331 @default.
- W2189117004 hasConcept C18903297 @default.
- W2189117004 hasConcept C25868968 @default.
- W2189117004 hasConcept C2780618852 @default.
- W2189117004 hasConcept C2816523 @default.
- W2189117004 hasConcept C29941650 @default.
- W2189117004 hasConcept C86803240 @default.
- W2189117004 hasConceptScore W2189117004C100134115 @default.
- W2189117004 hasConceptScore W2189117004C109007969 @default.
- W2189117004 hasConceptScore W2189117004C114793014 @default.
- W2189117004 hasConceptScore W2189117004C127313418 @default.
- W2189117004 hasConceptScore W2189117004C138170599 @default.
- W2189117004 hasConceptScore W2189117004C140345934 @default.
- W2189117004 hasConceptScore W2189117004C151730666 @default.
- W2189117004 hasConceptScore W2189117004C160464908 @default.
- W2189117004 hasConceptScore W2189117004C162501224 @default.
- W2189117004 hasConceptScore W2189117004C17409809 @default.
- W2189117004 hasConceptScore W2189117004C180705331 @default.
- W2189117004 hasConceptScore W2189117004C18903297 @default.
- W2189117004 hasConceptScore W2189117004C25868968 @default.
- W2189117004 hasConceptScore W2189117004C2780618852 @default.
- W2189117004 hasConceptScore W2189117004C2816523 @default.
- W2189117004 hasConceptScore W2189117004C29941650 @default.
- W2189117004 hasConceptScore W2189117004C86803240 @default.
- W2189117004 hasIssue "7" @default.
- W2189117004 hasLocation W21891170041 @default.
- W2189117004 hasOpenAccess W2189117004 @default.
- W2189117004 hasPrimaryLocation W21891170041 @default.
- W2189117004 hasRelatedWork W1979628347 @default.
- W2189117004 hasRelatedWork W1979818626 @default.
- W2189117004 hasRelatedWork W1980299820 @default.
- W2189117004 hasRelatedWork W1983084380 @default.
- W2189117004 hasRelatedWork W1986193378 @default.
- W2189117004 hasRelatedWork W1988158841 @default.
- W2189117004 hasRelatedWork W1994291261 @default.
- W2189117004 hasRelatedWork W2007811290 @default.
- W2189117004 hasRelatedWork W2016395667 @default.
- W2189117004 hasRelatedWork W2026432050 @default.
- W2189117004 hasRelatedWork W2053443350 @default.
- W2189117004 hasRelatedWork W2061333684 @default.
- W2189117004 hasRelatedWork W2075580865 @default.
- W2189117004 hasRelatedWork W2079582688 @default.
- W2189117004 hasRelatedWork W2081910176 @default.
- W2189117004 hasRelatedWork W2092489847 @default.
- W2189117004 hasRelatedWork W2139199749 @default.
- W2189117004 hasRelatedWork W2140363969 @default.
- W2189117004 hasRelatedWork W2166480443 @default.
- W2189117004 hasRelatedWork W2348893663 @default.
- W2189117004 hasVolume "25" @default.
- W2189117004 isParatext "false" @default.
- W2189117004 isRetracted "false" @default.
- W2189117004 magId "2189117004" @default.
- W2189117004 workType "article" @default.