FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4220874934> ?p ?o ?g. }

• W4220874934 endingPage "106678" @default.
• W4220874934 startingPage "106678" @default.
• W4220874934 abstract "We present a chemical and stable and radiogenic isotope data set for carbonatite, aillikite (ultramafic lamprophyre) and olivine melilitite from the Zandkopsdrift carbonatite complex in Namaqualand, South Africa. This carbonatite complex is associated with the ≈500-km-long, NE-SW oriented, age-progressive (40–80 Ma) Namaqualand-Bushmanland-Warmbad ultramafic alkaline magmatic lineation that consists mainly of olivine melilitite and kimberlite. Zandkopsdrift has a radiometric age of 55 ± 4 Ma and is unusual among southern African carbonatites because the dominant rock type exposed is aillikite (a variety of carbonated ultramafic lamprophyre), with carbonatite occurring mainly as a network of subvertical dykes in the southwest of the complex and olivine melilitite occurring as meter-sized blocks of float derived from the subsurface. Calcite and ferroan dolomite carbonatites are present but Mg-rich dolomitic carbonatite varieties are lacking. All rock types appear to have experienced at least moderate differentiation and all show elevated δ18OSMOW values for carbonate minerals, whereas phlogopite and clinopyroxene from these rock types fall near mantle values (with ranges of +13.3 to +21.8‰ and + 4.9 to +5.4‰ for carbonates and silicates, respectively), indicative of interaction with hydrous fluids at low-temperature. Sr-Nd-Pb isotope compositions indicate moderate to strong HIMU signatures (e.g., 206Pb/204Pbi = 19.4 to 21.0) with limited SrNd isotope variation and subvertical NdHf isotope arrays extending well below the ocean island basalt field and terrestrial array. Uncertainty regarding the differentiation history of the three rock types complicates estimation of primary magma compositions but strong chemical similarities between the carbonatites and aillikites, plus their close physical intermingling, strongly suggests that they are related by fractional crystallization to a common parental magma, whereas their relationship to the melilitites is less straightforward. The aillikites and melilitites have compositions of the REE and other elements similar to near-primary versions of these rock types from other alkaline igneous provinces globally, which have been explained as the products of low degrees of partial melting at 4–7 GPa (for aillikites) and slightly higher degrees of melting at 3–3.5 GPa (for melilitites). Lower pressures of generation and distinct trace element characteristics of the Zandkopsdrift melilitites could be explained by these originating as melts of a garnet wehrlite halo around the magmatic conduit formed by metasomatic reaction between carbonated melts and lithospheric peridotite. Most Zandkopsdrift carbonatites have high Lu/Hf ratios which, combined with their relatively low 176Hf/177Hf values, suggests that their mantle sources could not have formed more than 30–50 Myr prior to emplacement of the complex. This implies that a mantle plume had a role in their formation, either as a direct source of melts or as a source of heat with which to melt pre-existing metasomatic heterogeneities." @default.
• W4220874934 created "2022-04-03" @default.
• W4220874934 creator A5038838969 @default.
• W4220874934 creator A5060239398 @default.
• W4220874934 creator A5080174872 @default.
• W4220874934 date "2022-06-01" @default.
• W4220874934 modified "2023-09-30" @default.
• W4220874934 title "Carbonatite, aillikite and olivine melilitite from Zandkopsdrift, Namaqualand, South Africa: Constraints on the origin of an unusual lamprophyre-dominated carbonatite complex and the nature of its mantle source" @default.
• W4220874934 cites W1966278336 @default.
• W4220874934 cites W1969859799 @default.
• W4220874934 cites W1972962699 @default.
• W4220874934 cites W1974107814 @default.
• W4220874934 cites W1980932812 @default.
• W4220874934 cites W1981678508 @default.
• W4220874934 cites W1984846057 @default.
• W4220874934 cites W1987657517 @default.
• W4220874934 cites W1990044293 @default.
• W4220874934 cites W1990581568 @default.
• W4220874934 cites W1997941731 @default.
• W4220874934 cites W2002271865 @default.
• W4220874934 cites W2008364272 @default.
• W4220874934 cites W2013504332 @default.
• W4220874934 cites W2021828598 @default.
• W4220874934 cites W2031831175 @default.
• W4220874934 cites W2034632918 @default.
• W4220874934 cites W2038279872 @default.
• W4220874934 cites W2042857616 @default.
• W4220874934 cites W2045444333 @default.
• W4220874934 cites W2045743496 @default.
• W4220874934 cites W2048857036 @default.
• W4220874934 cites W204947067 @default.
• W4220874934 cites W2055424290 @default.
• W4220874934 cites W2058438893 @default.
• W4220874934 cites W2062471418 @default.
• W4220874934 cites W2067587529 @default.
• W4220874934 cites W2073281216 @default.
• W4220874934 cites W2073661360 @default.
• W4220874934 cites W2078356250 @default.
• W4220874934 cites W2082827421 @default.
• W4220874934 cites W2084638107 @default.
• W4220874934 cites W2086931428 @default.
• W4220874934 cites W2087320324 @default.
• W4220874934 cites W2098958698 @default.
• W4220874934 cites W2099067742 @default.
• W4220874934 cites W2103527049 @default.
• W4220874934 cites W2110725824 @default.
• W4220874934 cites W2115996585 @default.
• W4220874934 cites W2122197016 @default.
• W4220874934 cites W2126674782 @default.
• W4220874934 cites W2128847471 @default.
• W4220874934 cites W2136697439 @default.
• W4220874934 cites W2143625551 @default.
• W4220874934 cites W2146457984 @default.
• W4220874934 cites W2154767216 @default.
• W4220874934 cites W2156920669 @default.
• W4220874934 cites W2158541765 @default.
• W4220874934 cites W2162221104 @default.
• W4220874934 cites W2163800319 @default.
• W4220874934 cites W2165623492 @default.
• W4220874934 cites W2167291234 @default.
• W4220874934 cites W2295462978 @default.
• W4220874934 cites W2317786033 @default.
• W4220874934 cites W2338448040 @default.
• W4220874934 cites W2513297223 @default.
• W4220874934 cites W2901324619 @default.
• W4220874934 cites W2918511110 @default.
• W4220874934 cites W2920401750 @default.
• W4220874934 doi "https://doi.org/10.1016/j.lithos.2022.106678" @default.
• W4220874934 hasPublicationYear "2022" @default.
• W4220874934 type Work @default.
• W4220874934 citedByCount "0" @default.
• W4220874934 crossrefType "journal-article" @default.
• W4220874934 hasAuthorship W4220874934A5038838969 @default.
• W4220874934 hasAuthorship W4220874934A5060239398 @default.
• W4220874934 hasAuthorship W4220874934A5080174872 @default.
• W4220874934 hasBestOaLocation W42208749341 @default.
• W4220874934 hasConcept C127313418 @default.
• W4220874934 hasConcept C140441402 @default.
• W4220874934 hasConcept C17409809 @default.
• W4220874934 hasConcept C183282558 @default.
• W4220874934 hasConcept C195081551 @default.
• W4220874934 hasConcept C2778882853 @default.
• W4220874934 hasConcept C2780181037 @default.
• W4220874934 hasConcept C2780364934 @default.
• W4220874934 hasConcept C67236022 @default.
• W4220874934 hasConceptScore W4220874934C127313418 @default.
• W4220874934 hasConceptScore W4220874934C140441402 @default.
• W4220874934 hasConceptScore W4220874934C17409809 @default.
• W4220874934 hasConceptScore W4220874934C183282558 @default.
• W4220874934 hasConceptScore W4220874934C195081551 @default.
• W4220874934 hasConceptScore W4220874934C2778882853 @default.
• W4220874934 hasConceptScore W4220874934C2780181037 @default.
• W4220874934 hasConceptScore W4220874934C2780364934 @default.
• W4220874934 hasConceptScore W4220874934C67236022 @default.
• W4220874934 hasFunder F4320320671 @default.
• W4220874934 hasLocation W42208749341 @default.
• W4220874934 hasOpenAccess W4220874934 @default.
• W4220874934 hasPrimaryLocation W42208749341 @default.

• next