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• W1546576045 abstract "The Precambrian rocks of the New Jersey Highlands in the Belvidere and Washington quadrangles consist of marble, amphibolite, quartzo-feldspathic gneiss, and syntectonic granite which developed during regional metamorphism under granulite-facies conditions. Field relationships, petrographic data, and bulk •/ chemical analyses support the view that the quartzpotassium feldspar gneiss, quartz-epidote gneiss, marble, and garnet-biotite gneiss are of raetasedimentary origin. The quartz-potassium feldspar gneiss and quartz-epidote gneiss were probably derived from arkosic sediments which contained intercalated limestones. The compositional layering in the metamorphic rocks appears to reflect original sedimentary bedding. Chemical analyses indicate that the amphibolite *• was derived from sedimentary rocks. Chemical analyses < 9 support the conclusion that the premetamorphic parent of the oligoclase-quartz gneiss was probably an ash flow or keratophyric tuff. ; Perthitic granite bodies do not show either intrusive contacts with the country rock or chilled margins. Small bodies of granite are commonly enclosed by gneiss and may have developed by partial fusion (in situ anatexis) of metasedimentary quartz-potassium feldspar gneiss. Syenite bodies are interpreted as feldspar-rich residues resulting from filter pressing in areas of tight isoclinal folding during anatexis. Sodium-rich granitic rocks apparently developed by anatexis of oligoclase-quartz gneiss. * The magnetite deposits in the study area are massive granular mixtures of magnetite and quartz with minor pyrite. The classical hypothesis for the origin of these deposits is that the uniqueand distinctive pyroxenite associated with the gneiss-enclosed deposits is a contact-metasomatic skarn developed by fluids emanating from alaskite intrusions and that the ores are, therefore, of pneumatolytic origin ^.ar they are spatially and genetically associated with these pyroxene-rich skarns. However, the occurrence of magnetite concentrations in sharply bounded tabular-" @default.
• W1546576045 created "2016-06-24" @default.
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• W1546576045 date "1980-01-01" @default.
• W1546576045 modified "2023-09-26" @default.
• W1546576045 title "Precambrian geology and magnetite deposits of the New Jersey highlands in Warren County, New Jersey" @default.
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• W1546576045 doi "https://doi.org/10.3133/ofr80789" @default.
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