Matches in SemOpenAlex for { <https://semopenalex.org/work/W1510432797> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W1510432797 abstract "The Adirondack Mountains, NY are ideal for studying melting and migmatites in conformable granitic leucosomes cutting melanocratic metasediments. Leucocratic bands range in thickness from mm- to dm-scale, and have average quartz:K-spar:plagioclase norms of 46:16:38 in the upper amphibolite facies NW Lowlands and 26:51:23 in the granulite facies SE Highlands. To determine whether these leucocratic bands were local melts of surrounding melanosomes or externally-derived intrusions, we have correlated cathodoluminescence (CL) imaging, in situ U-Pb geochronology by SHRIMP, in situ zircon δ18O measurements by CAMECA IMS 1280 ion microprobe, and metamorphic garnet δ18O measurements by laser fluorination at 9 locations. CL imaging indicates three populations of zircons in both regions: 1. relatively featureless rounded 'soccer balls' (metamorphic), and rhythmically zoned (igneous) cores truncated by either 2. discordantly zoned (igneous) or 3. unzoned (metamorphic) rims. The U-Pb ages confirm CL classification as either 'igneous' or 'metamorphic' and determine the timing of different events. Typical δ18O ion microprobe spot-to-spot reproducibility of zircon standards is ±0.14‰ (1SD). For zircons from 3 leucosomes from the NW, igneous cores average 7.7±2.2‰ (1SD, VSMOW, n=5), a single igneous rim is 8.2‰, and metamorphic rims and whole grains average 10.1±1.9‰ (n=14). In corresponding melanosomes, igneous zircon rims average 8.4±1.4‰ (n=3) and garnets average 10.5±0.5‰. Average zircon rim age is 1208±33Ma, while average metamorphic age is 1165±58Ma. For zircons from 6 leucosomes from the SE, igneous cores average 8.2±2.1‰ (n=7) and igneous rims average 11.6±0.6‰ (n=4); metamorphic rims and grains average 10.1±1.4‰ (n=36). In corresponding melanosomes, igneous zircon rims average 11.7±0.04‰ (n=2), while garnets average 11.5±1.4‰. Average zircon rim age is 1103±63Ma, while average metamorphic age is 1132±80Ma. Values of 'igneous' δ18O in leucocratic layers are unusually high for plutonic rocks, especially in the SE. These high δ18O values (>10‰) cannot represent nearby magmas and indicate melting of surrounding metapelites. Metamorphism and anatexis occurred concurrently, and dehydration by melting at 1.2-1.1Ga lead to low water activity during Ottawan granulite metamorphism at ~1050Ma." @default.
- W1510432797 created "2016-06-24" @default.
- W1510432797 creator A5019928288 @default.
- W1510432797 creator A5021068053 @default.
- W1510432797 creator A5026638700 @default.
- W1510432797 creator A5064978089 @default.
- W1510432797 creator A5082153682 @default.
- W1510432797 creator A5083082382 @default.
- W1510432797 creator A5089331334 @default.
- W1510432797 creator A5090514819 @default.
- W1510432797 date "2009-01-01" @default.
- W1510432797 modified "2023-09-25" @default.
- W1510432797 title "In situ granitoid genesis and dehydration in the Adirondacks" @default.
- W1510432797 hasPublicationYear "2009" @default.
- W1510432797 type Work @default.
- W1510432797 sameAs 1510432797 @default.
- W1510432797 citedByCount "0" @default.
- W1510432797 crossrefType "journal-article" @default.
- W1510432797 hasAuthorship W1510432797A5019928288 @default.
- W1510432797 hasAuthorship W1510432797A5021068053 @default.
- W1510432797 hasAuthorship W1510432797A5026638700 @default.
- W1510432797 hasAuthorship W1510432797A5064978089 @default.
- W1510432797 hasAuthorship W1510432797A5082153682 @default.
- W1510432797 hasAuthorship W1510432797A5083082382 @default.
- W1510432797 hasAuthorship W1510432797A5089331334 @default.
- W1510432797 hasAuthorship W1510432797A5090514819 @default.
- W1510432797 hasConcept C109007969 @default.
- W1510432797 hasConcept C112764850 @default.
- W1510432797 hasConcept C114793014 @default.
- W1510432797 hasConcept C119073576 @default.
- W1510432797 hasConcept C127313418 @default.
- W1510432797 hasConcept C136137745 @default.
- W1510432797 hasConcept C146588470 @default.
- W1510432797 hasConcept C151730666 @default.
- W1510432797 hasConcept C171701179 @default.
- W1510432797 hasConcept C17409809 @default.
- W1510432797 hasConcept C18142444 @default.
- W1510432797 hasConcept C185339796 @default.
- W1510432797 hasConcept C26687426 @default.
- W1510432797 hasConcept C2778849375 @default.
- W1510432797 hasConcept C42787717 @default.
- W1510432797 hasConcept C77928131 @default.
- W1510432797 hasConcept C79927612 @default.
- W1510432797 hasConceptScore W1510432797C109007969 @default.
- W1510432797 hasConceptScore W1510432797C112764850 @default.
- W1510432797 hasConceptScore W1510432797C114793014 @default.
- W1510432797 hasConceptScore W1510432797C119073576 @default.
- W1510432797 hasConceptScore W1510432797C127313418 @default.
- W1510432797 hasConceptScore W1510432797C136137745 @default.
- W1510432797 hasConceptScore W1510432797C146588470 @default.
- W1510432797 hasConceptScore W1510432797C151730666 @default.
- W1510432797 hasConceptScore W1510432797C171701179 @default.
- W1510432797 hasConceptScore W1510432797C17409809 @default.
- W1510432797 hasConceptScore W1510432797C18142444 @default.
- W1510432797 hasConceptScore W1510432797C185339796 @default.
- W1510432797 hasConceptScore W1510432797C26687426 @default.
- W1510432797 hasConceptScore W1510432797C2778849375 @default.
- W1510432797 hasConceptScore W1510432797C42787717 @default.
- W1510432797 hasConceptScore W1510432797C77928131 @default.
- W1510432797 hasConceptScore W1510432797C79927612 @default.
- W1510432797 hasLocation W15104327971 @default.
- W1510432797 hasOpenAccess W1510432797 @default.
- W1510432797 hasPrimaryLocation W15104327971 @default.
- W1510432797 hasRelatedWork W1814240107 @default.
- W1510432797 hasRelatedWork W1964236143 @default.
- W1510432797 hasRelatedWork W1968409933 @default.
- W1510432797 hasRelatedWork W1987628258 @default.
- W1510432797 hasRelatedWork W2021221536 @default.
- W1510432797 hasRelatedWork W2027890161 @default.
- W1510432797 hasRelatedWork W2030692873 @default.
- W1510432797 hasRelatedWork W2035048075 @default.
- W1510432797 hasRelatedWork W2040287076 @default.
- W1510432797 hasRelatedWork W2090454239 @default.
- W1510432797 hasRelatedWork W2146373633 @default.
- W1510432797 hasRelatedWork W2159139989 @default.
- W1510432797 hasRelatedWork W2363457454 @default.
- W1510432797 hasRelatedWork W2433275762 @default.
- W1510432797 hasRelatedWork W2937466239 @default.
- W1510432797 hasRelatedWork W2949063976 @default.
- W1510432797 hasRelatedWork W3012972403 @default.
- W1510432797 hasRelatedWork W3138567465 @default.
- W1510432797 hasRelatedWork W3144536470 @default.
- W1510432797 hasRelatedWork W3151612525 @default.
- W1510432797 isParatext "false" @default.
- W1510432797 isRetracted "false" @default.
- W1510432797 magId "1510432797" @default.
- W1510432797 workType "article" @default.