Matches in SemOpenAlex for { <https://semopenalex.org/work/W2077960032> ?p ?o ?g. }
- W2077960032 endingPage "35" @default.
- W2077960032 startingPage "17" @default.
- W2077960032 abstract "The Mesoproterozoic Mount Angelay igneous complex contained intrusions that were emplaced into amphibolite facies metasedimentary rocks during two periods of ∼1550 and post-1540 Ma magmatism. Sm–Nd isotopic analysis together with mineralogical and chemical considerations suggest that the intrusions were produced from a Paleoproterozoic crustal source with a T2 model age ∼2200 Ma. On geochemical and petrological grounds, the ∼1550 Ma trondhjemitic intrusions are interpreted to have been produced by melting of amphibolite under garnet-stable conditions (>8–10 kbar). The late-syn to post-peak metamorphic timing of these intrusions suggested that they were associated with the tectono-thermal event that produced regional peak metamorphic mineral assemblages. The post-1540 Ma intrusions are K-rich and consist of two groups of synchronously emplaced intrusions, (1) a high-K monzodiorite and monzogranite suite that range between 51 and 77 wt.% SiO2; and (2) a high-K, Na-enriched hornblende monzonite. The chemistry and mineralogy of these intrusions suggested that they were derived via plagioclase-stable and garnet-unstable melting (<8–10 kbar). The high-K monzodiorite and monzogranite are interpreted to have formed from a plagioclase-bearing source that contained abundant K-feldspar, biotite and/or amphibole. These intrusions are relatively enriched in K, Ca, LREE, Ba, Sr, Zr, Cl and F, and depleted in Na2O, P2O5, Cr, V and Zn compared with slightly younger high-K monzonite, which is interpreted to have formed via one of two mechanisms, (1) melting of a low-K amphibole- and plagioclase-rich source; or (2) melting of residual material that produces a potassic and incompatible element-rich melt. These magmas likely contained mantle-derived material, particularly the K-rich intrusions of mafic composition. The heat required for the production of post-1540 Ma intrusions appears to have been generated by the intrusion of high-T, mantle-derived, mafic material into the crust (∼25–30 km; ∼8–10 kbar). This model is consistent with the synchronous emplacement of mafic and felsic magma and the lack of a consanguineous regional metamorphic association, and suggests high-T, high-degree partial melting in localised pockets within fertile source regions in the crust. An increase in Sm–Nd model source age and decrease in εNd with increasing SiO2 in the K-rich intrusions suggests the incorporation of juvenile material in the more mafic rocks. The origin of this component is unknown, but it may represent either the incorporation of mantle-derived material during melting, or the partial melting of crust with a younger mafic component. On a district scale, the >30 million year period over which the K-rich post-1540 Ma intrusions were emplaced suggested that mantle-derived material continued to be injected into the crust. A mantle component to these rocks, and the global distribution of Proterozoic intrusions with similar geochemical affinities, strongly suggests a world-wide period of mantle-induced crustal melting at that time. The dominant Paleoproterozoic isotopic composition of most of these intrusions suggests melting of similarly composed and matured source rocks." @default.
- W2077960032 created "2016-06-24" @default.
- W2077960032 creator A5016985904 @default.
- W2077960032 date "2001-01-01" @default.
- W2077960032 modified "2023-10-16" @default.
- W2077960032 title "Nd isotope and petrogenetic constraints for the origin of the Mount Angelay igneous complex: implications for the origin of intrusions in the Cloncurry district, NE Australia" @default.
- W2077960032 cites W1530336934 @default.
- W2077960032 cites W1572307770 @default.
- W2077960032 cites W1964617878 @default.
- W2077960032 cites W1977650828 @default.
- W2077960032 cites W1978476527 @default.
- W2077960032 cites W1980181900 @default.
- W2077960032 cites W1981756317 @default.
- W2077960032 cites W1984569312 @default.
- W2077960032 cites W1991537732 @default.
- W2077960032 cites W1998285411 @default.
- W2077960032 cites W1999268352 @default.
- W2077960032 cites W1999448338 @default.
- W2077960032 cites W1999602453 @default.
- W2077960032 cites W2003584880 @default.
- W2077960032 cites W2011308336 @default.
- W2077960032 cites W2012326879 @default.
- W2077960032 cites W2014333968 @default.
- W2077960032 cites W2014579805 @default.
- W2077960032 cites W2019392649 @default.
- W2077960032 cites W2020405626 @default.
- W2077960032 cites W2021987309 @default.
- W2077960032 cites W2022017333 @default.
- W2077960032 cites W2024979442 @default.
- W2077960032 cites W2029343011 @default.
- W2077960032 cites W2040549377 @default.
- W2077960032 cites W2048673457 @default.
- W2077960032 cites W2050103121 @default.
- W2077960032 cites W2062889975 @default.
- W2077960032 cites W2071025161 @default.
- W2077960032 cites W2075594143 @default.
- W2077960032 cites W2088875762 @default.
- W2077960032 cites W2089349603 @default.
- W2077960032 cites W2106221578 @default.
- W2077960032 cites W2108971421 @default.
- W2077960032 cites W2112775909 @default.
- W2077960032 cites W2138522501 @default.
- W2077960032 cites W2148388790 @default.
- W2077960032 cites W2151802570 @default.
- W2077960032 cites W2316472930 @default.
- W2077960032 cites W2325019720 @default.
- W2077960032 cites W4252293426 @default.
- W2077960032 doi "https://doi.org/10.1016/s0301-9268(00)00101-7" @default.
- W2077960032 hasPublicationYear "2001" @default.
- W2077960032 type Work @default.
- W2077960032 sameAs 2077960032 @default.
- W2077960032 citedByCount "39" @default.
- W2077960032 countsByYear W20779600322012 @default.
- W2077960032 countsByYear W20779600322013 @default.
- W2077960032 countsByYear W20779600322016 @default.
- W2077960032 countsByYear W20779600322017 @default.
- W2077960032 countsByYear W20779600322020 @default.
- W2077960032 countsByYear W20779600322021 @default.
- W2077960032 countsByYear W20779600322022 @default.
- W2077960032 countsByYear W20779600322023 @default.
- W2077960032 crossrefType "journal-article" @default.
- W2077960032 hasAuthorship W2077960032A5016985904 @default.
- W2077960032 hasConcept C127313418 @default.
- W2077960032 hasConcept C151730666 @default.
- W2077960032 hasConcept C161509811 @default.
- W2077960032 hasConcept C167284885 @default.
- W2077960032 hasConcept C17409809 @default.
- W2077960032 hasConcept C20209278 @default.
- W2077960032 hasConcept C2776698055 @default.
- W2077960032 hasConcept C2777212541 @default.
- W2077960032 hasConcept C2777229588 @default.
- W2077960032 hasConcept C2778520076 @default.
- W2077960032 hasConcept C2779181077 @default.
- W2077960032 hasConcept C2779870107 @default.
- W2077960032 hasConcept C34122518 @default.
- W2077960032 hasConcept C42787717 @default.
- W2077960032 hasConcept C44938399 @default.
- W2077960032 hasConcept C4992710 @default.
- W2077960032 hasConcept C5900021 @default.
- W2077960032 hasConcept C77928131 @default.
- W2077960032 hasConcept C79572550 @default.
- W2077960032 hasConceptScore W2077960032C127313418 @default.
- W2077960032 hasConceptScore W2077960032C151730666 @default.
- W2077960032 hasConceptScore W2077960032C161509811 @default.
- W2077960032 hasConceptScore W2077960032C167284885 @default.
- W2077960032 hasConceptScore W2077960032C17409809 @default.
- W2077960032 hasConceptScore W2077960032C20209278 @default.
- W2077960032 hasConceptScore W2077960032C2776698055 @default.
- W2077960032 hasConceptScore W2077960032C2777212541 @default.
- W2077960032 hasConceptScore W2077960032C2777229588 @default.
- W2077960032 hasConceptScore W2077960032C2778520076 @default.
- W2077960032 hasConceptScore W2077960032C2779181077 @default.
- W2077960032 hasConceptScore W2077960032C2779870107 @default.
- W2077960032 hasConceptScore W2077960032C34122518 @default.
- W2077960032 hasConceptScore W2077960032C42787717 @default.
- W2077960032 hasConceptScore W2077960032C44938399 @default.
- W2077960032 hasConceptScore W2077960032C4992710 @default.
- W2077960032 hasConceptScore W2077960032C5900021 @default.