FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2612912483> ?p ?o ?g. }

• W2612912483 endingPage "360" @default.
• W2612912483 startingPage "327" @default.
• W2612912483 abstract "The Bushveld Complex is the largest mafic layered intrusion on Earth, containing immense mineral resources. Despite its importance there remains uncertainty as to its origin and the source of the magmas that formed it. The lower Bushveld series, made up of the Basal Ultramafic Sequence (BUS), the Marginal Zone and Lower Zone, is of particular importance because it allows detailed insight into the reservoirs that multiply contributed to the formation and modification of the initial magmas. This sequence is represented by three overlapping drill cores (2100 m of stratigraphy) in the eastern Bushveld Complex for which we present the first comprehensive study on intercumulus mineral assemblages, incompatible trace elements and in situ Sr isotopes in plagioclase from over 130 core samples for this section (Clapham area). The intercumulus mineral assemblage that crystallized from the trapped melt comprises plagioclase, K-feldspar, biotite and quartz and a wide variety of accessory phases, including zircon, loveringite and primary magmatic anhydrite, the first time the last mineral has been reported in the layered sequence of the Bushveld Complex. The incompatible trace elements (ITE) show a gradual decrease in concentration upwards through the stratigraphic section, reflecting mainly the decreasing trapped melt component in the cumulates as the chamber became established. ITE ratios and changes in initial 87Sr/86Sr [referred to as (87Sr/86Sr)i at 2055 Ma] give insight into the various mantle sources and the contaminants, which were derived from both the lower crust and the country-rock sediments of the Pretoria Group (upper crust). (87Sr/86Sr)i ranges from 0·7042 to 0·7076, with the lowest values associated with the most ultramafic rock units in the BUS and the highest in Marginal Zone norites that formed from evolved magma at the top of the early chamber prior to ingression of Lower Zone magma. The evolved magma was affected by significant assimilation of sediments as evidenced by partly digested (now restitic) metapelite xenoliths, particularly in the upper part of the Marginal Zone. Rare earth element (REE) patterns combined with modelling of trace elements and (87Sr/86Sr)i confirm the strong crustal contamination derived from both the lower crust of the Kaapvaal Craton and the enclosing sediments. The Lower Zone shows a progressively increasing mantle signature upwards in the sequence with both flat and steep light REE (LREE) patterns indicating primitive (but still crustally contaminated) and more highly contaminated melts. However, the relatively low Mg# for orthopyroxene and olivine (maximum Mg# 0·88) in the Lower Zone requires a melt contribution of lower Mg# than would be associated with an asthenosphere mantle source and at the same time having an LREE-depleted composition. Such a source is indicative of subcontinental lithospheric mantle (SCLM) and a progressively greater melt component of an eclogitic protolith contributing to the parental magmas. The source of heat for this massive, but short-lived, melting event is likely to have been a mantle plume, which gave rise to the initial and most primitive (asthenospheric origin) magmas of the BUS but with subsequent melting of an SCLM source. Both magmas were subject to crustal contamination from the lower crust and the enclosing sediments. The results of this study are used to quantify the roles of the various Bushveld reservoirs including the previously proposed metasomatized SCLM, most probably the source of the PGE and Cr that must have been present." @default.
• W2612912483 created "2017-05-19" @default.
• W2612912483 creator A5011543051 @default.
• W2612912483 creator A5030081327 @default.
• W2612912483 creator A5081568252 @default.
• W2612912483 date "2017-02-01" @default.
• W2612912483 modified "2023-10-16" @default.
• W2612912483 title "In Situ Sr isotopes in Plagioclase and Trace Element Systematics in the Lowest Part of the Eastern Bushveld Complex: Dynamic Processes in an Evolving Magma Chamber" @default.
• W2612912483 cites W1597967679 @default.
• W2612912483 cites W1760510380 @default.
• W2612912483 cites W1969859799 @default.
• W2612912483 cites W1972050139 @default.
• W2612912483 cites W1975661480 @default.
• W2612912483 cites W1980328986 @default.
• W2612912483 cites W1986348112 @default.
• W2612912483 cites W1991445735 @default.
• W2612912483 cites W1994884217 @default.
• W2612912483 cites W2002608841 @default.
• W2612912483 cites W2002739439 @default.
• W2612912483 cites W2007060519 @default.
• W2612912483 cites W2007360474 @default.
• W2612912483 cites W2009315256 @default.
• W2612912483 cites W2014943600 @default.
• W2612912483 cites W2016154516 @default.
• W2612912483 cites W2017424929 @default.
• W2612912483 cites W2018489161 @default.
• W2612912483 cites W2019535197 @default.
• W2612912483 cites W2022397453 @default.
• W2612912483 cites W2027795080 @default.
• W2612912483 cites W2033112269 @default.
• W2612912483 cites W2037331969 @default.
• W2612912483 cites W2043858309 @default.
• W2612912483 cites W2057306801 @default.
• W2612912483 cites W2060929431 @default.
• W2612912483 cites W2061095231 @default.
• W2612912483 cites W2068250266 @default.
• W2612912483 cites W2069843631 @default.
• W2612912483 cites W2070935507 @default.
• W2612912483 cites W2071590672 @default.
• W2612912483 cites W2074785641 @default.
• W2612912483 cites W2074848179 @default.
• W2612912483 cites W2075447982 @default.
• W2612912483 cites W2082192342 @default.
• W2612912483 cites W2085746716 @default.
• W2612912483 cites W2090472981 @default.
• W2612912483 cites W2091316274 @default.
• W2612912483 cites W2097031891 @default.
• W2612912483 cites W2098018609 @default.
• W2612912483 cites W2099223845 @default.
• W2612912483 cites W2103182293 @default.
• W2612912483 cites W2106142284 @default.
• W2612912483 cites W2111094575 @default.
• W2612912483 cites W2111507802 @default.
• W2612912483 cites W2111672926 @default.
• W2612912483 cites W2116055656 @default.
• W2612912483 cites W2121060014 @default.
• W2612912483 cites W2122091911 @default.
• W2612912483 cites W2129537033 @default.
• W2612912483 cites W2130511591 @default.
• W2612912483 cites W2133332722 @default.
• W2612912483 cites W2133676596 @default.
• W2612912483 cites W2141252509 @default.
• W2612912483 cites W2146645019 @default.
• W2612912483 cites W2152231452 @default.
• W2612912483 cites W2158183720 @default.
• W2612912483 cites W2160368579 @default.
• W2612912483 cites W2162586271 @default.
• W2612912483 cites W2164240285 @default.
• W2612912483 cites W2169795919 @default.
• W2612912483 cites W2169984600 @default.
• W2612912483 cites W2170380709 @default.
• W2612912483 cites W2182228134 @default.
• W2612912483 cites W2314965201 @default.
• W2612912483 cites W2316716845 @default.
• W2612912483 cites W2328653673 @default.
• W2612912483 cites W2403687521 @default.
• W2612912483 cites W829181338 @default.
• W2612912483 cites W847558497 @default.
• W2612912483 doi "https://doi.org/10.1093/petrology/egx018" @default.
• W2612912483 hasPublicationYear "2017" @default.
• W2612912483 type Work @default.
• W2612912483 sameAs 2612912483 @default.
• W2612912483 citedByCount "32" @default.
• W2612912483 countsByYear W26129124832017 @default.
• W2612912483 countsByYear W26129124832018 @default.
• W2612912483 countsByYear W26129124832019 @default.
• W2612912483 countsByYear W26129124832020 @default.
• W2612912483 countsByYear W26129124832021 @default.
• W2612912483 countsByYear W26129124832022 @default.
• W2612912483 countsByYear W26129124832023 @default.
• W2612912483 crossrefType "journal-article" @default.
• W2612912483 hasAuthorship W2612912483A5011543051 @default.
• W2612912483 hasAuthorship W2612912483A5030081327 @default.
• W2612912483 hasAuthorship W2612912483A5081568252 @default.
• W2612912483 hasBestOaLocation W26129124831 @default.
• W2612912483 hasConcept C120806208 @default.
• W2612912483 hasConcept C127313418 @default.
• W2612912483 hasConcept C139347428 @default.

• next