Matches in SemOpenAlex for { <https://semopenalex.org/work/W2910640058> ?p ?o ?g. }
Showing items 1 to 93 of
93
with 100 items per page.
- W2910640058 endingPage "402" @default.
- W2910640058 startingPage "383" @default.
- W2910640058 abstract "Abstract Vredefort Granophyre dykes are generally considered to be a part of impact melt, which intruded downward from the melt sheet of the Vredefort impact structure (South Africa). This work reports enigmatic textural inhomogeneities found within the Daskop and southeast Holfontein granophyre dykes located in the core of the Vredefort impact structure, and in the Kopjeskraal core-collar granophyre dyke. The heterogeneities attributed to the clast-rich dykes (up to 70 vol% of clasts), however, do not occur within the portions of high clast abundance in these dykes. Instead, they are found within dyke portions with 5 to 10 vol% of clasts. They were not observed in the clast-poor northwest Holfontein dyke. The reported heterogeneities are veins with macroscopically straight and sharp boundaries that are parallel to the strike of the host dyke. The veins are usually from 4 to 20 cm wide and are often differentially eroded with respect to the host rock. Microscopic analyses demonstrate that the veins are coarser-grained than the host granophyre, with the increase in grain size of at least four times. Portable μ-XRF, whole rock WD-XRF and microprobe analyses indicate practically identical composition of the veins to the host granophyre. Slightly higher Ab and K mole % values of plagioclase and Fe-enriched rims of orthopyroxene within the veins suggest lower crystallization temperatures of the veins and/or crystallization over a longer period of time. We interpret the coarse-grained veins as either pegmatitic, typical for felsic intrusive rocks, or being similar to coarse-grained segregation veins reported from basaltic flows, both of which would normally involve late, volatile-enriched residual melts. In either case, the veins probably formed with comparatively small volatile component (≤1 wt% of water) derived from the wall rocks and from the incorporated lithic clasts. The main implication of our study is that the granophyre dykes are inhomogeneous and complicated formations, which contrasts with previous reports. Additionally, we report for the first time that the composition of the granophyre is corresponding to dacite." @default.
- W2910640058 created "2019-01-25" @default.
- W2910640058 creator A5064029441 @default.
- W2910640058 creator A5065700826 @default.
- W2910640058 creator A5078355261 @default.
- W2910640058 date "2018-12-01" @default.
- W2910640058 modified "2023-10-16" @default.
- W2910640058 title "Petrography and geochemistry of coarse-crystalline veins within Vredefort Granophyre, Vredefort impact structure, South Africa" @default.
- W2910640058 cites W1485237895 @default.
- W2910640058 cites W1965180288 @default.
- W2910640058 cites W1974440876 @default.
- W2910640058 cites W1982293316 @default.
- W2910640058 cites W1986168461 @default.
- W2910640058 cites W1987759804 @default.
- W2910640058 cites W1997808792 @default.
- W2910640058 cites W1998769902 @default.
- W2910640058 cites W1999448338 @default.
- W2910640058 cites W2011633803 @default.
- W2910640058 cites W2014976659 @default.
- W2910640058 cites W2047647938 @default.
- W2910640058 cites W2062692730 @default.
- W2910640058 cites W2068191374 @default.
- W2910640058 cites W2068431439 @default.
- W2910640058 cites W2077642718 @default.
- W2910640058 cites W2091806282 @default.
- W2910640058 cites W2103542642 @default.
- W2910640058 cites W2157099954 @default.
- W2910640058 cites W2166691623 @default.
- W2910640058 cites W2302218589 @default.
- W2910640058 cites W2740740688 @default.
- W2910640058 cites W2767627061 @default.
- W2910640058 cites W2796256371 @default.
- W2910640058 cites W2802738301 @default.
- W2910640058 cites W4240200058 @default.
- W2910640058 doi "https://doi.org/10.25131/sajg.121.0023" @default.
- W2910640058 hasPublicationYear "2018" @default.
- W2910640058 type Work @default.
- W2910640058 sameAs 2910640058 @default.
- W2910640058 citedByCount "7" @default.
- W2910640058 countsByYear W29106400582019 @default.
- W2910640058 countsByYear W29106400582020 @default.
- W2910640058 countsByYear W29106400582021 @default.
- W2910640058 countsByYear W29106400582022 @default.
- W2910640058 countsByYear W29106400582023 @default.
- W2910640058 crossrefType "journal-article" @default.
- W2910640058 hasAuthorship W2910640058A5064029441 @default.
- W2910640058 hasAuthorship W2910640058A5065700826 @default.
- W2910640058 hasAuthorship W2910640058A5078355261 @default.
- W2910640058 hasConcept C127313418 @default.
- W2910640058 hasConcept C138170599 @default.
- W2910640058 hasConcept C151730666 @default.
- W2910640058 hasConcept C167284885 @default.
- W2910640058 hasConcept C17409809 @default.
- W2910640058 hasConcept C193429443 @default.
- W2910640058 hasConcept C2779181077 @default.
- W2910640058 hasConcept C2779870107 @default.
- W2910640058 hasConcept C42787717 @default.
- W2910640058 hasConcept C5900021 @default.
- W2910640058 hasConcept C59235061 @default.
- W2910640058 hasConcept C6494504 @default.
- W2910640058 hasConceptScore W2910640058C127313418 @default.
- W2910640058 hasConceptScore W2910640058C138170599 @default.
- W2910640058 hasConceptScore W2910640058C151730666 @default.
- W2910640058 hasConceptScore W2910640058C167284885 @default.
- W2910640058 hasConceptScore W2910640058C17409809 @default.
- W2910640058 hasConceptScore W2910640058C193429443 @default.
- W2910640058 hasConceptScore W2910640058C2779181077 @default.
- W2910640058 hasConceptScore W2910640058C2779870107 @default.
- W2910640058 hasConceptScore W2910640058C42787717 @default.
- W2910640058 hasConceptScore W2910640058C5900021 @default.
- W2910640058 hasConceptScore W2910640058C59235061 @default.
- W2910640058 hasConceptScore W2910640058C6494504 @default.
- W2910640058 hasIssue "4" @default.
- W2910640058 hasLocation W29106400581 @default.
- W2910640058 hasOpenAccess W2910640058 @default.
- W2910640058 hasPrimaryLocation W29106400581 @default.
- W2910640058 hasRelatedWork W132151891 @default.
- W2910640058 hasRelatedWork W1889317634 @default.
- W2910640058 hasRelatedWork W1991496150 @default.
- W2910640058 hasRelatedWork W2148602589 @default.
- W2910640058 hasRelatedWork W2159462279 @default.
- W2910640058 hasRelatedWork W2560724112 @default.
- W2910640058 hasRelatedWork W2806064039 @default.
- W2910640058 hasRelatedWork W2911405760 @default.
- W2910640058 hasRelatedWork W3200145365 @default.
- W2910640058 hasRelatedWork W2184781776 @default.
- W2910640058 hasVolume "121" @default.
- W2910640058 isParatext "false" @default.
- W2910640058 isRetracted "false" @default.
- W2910640058 magId "2910640058" @default.
- W2910640058 workType "article" @default.