Results 181 to 190 of about 1,938 (228)
Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 1992 ABSTRACTUsing the ion microprobe SHRIMP we have analysed zircons from the Ben Vuirich, Glen Kyllachy, Inchbae and Vagastie Bridge granites from the Scottish Caledonides, in an attempt to resolve the ages of inherited zircons shown to be present in these granites by previous conventional multigrain analyses.
R. T. Pidgeon, W. Compston
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Contributions to Mineralogy and Petrology, 2018 The Cretaceous Mount Daniel Complex (MDC) in northern Fiordland, New Zealand was emplaced as a 50 m-thick dyke and sheet complex into an active shear zone at the base of a Cordilleran magmatic arc. It was emplaced below the 20–25 km-thick, 125.3 ± 1.3 Ma old Western Fiordland Orthogneiss (WFO) and is characterized by metre-scale sheets of sodic, low ...
Shrema Bhattacharya +2 more
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Geochimica Et Cosmochimica Acta, 1987
U-Pb analyses of zircons separated from two Concord-type plutons near Sunapee and Dixville Notch, New Hampshire, reveal differences in the pattern and magnitude of zircon inheritance which are related to differences in melt chemistry. The Sunapee pluton contains only slightly more Zr than required to saturate the melt at the peak temperature of 700 +/-
T Mark Harrison, W Compston
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U-Pb analyses of zircons separated from two Concord-type plutons near Sunapee and Dixville Notch, New Hampshire, reveal differences in the pattern and magnitude of zircon inheritance which are related to differences in melt chemistry. The Sunapee pluton contains only slightly more Zr than required to saturate the melt at the peak temperature of 700 +/-
T Mark Harrison, W Compston
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Is Myanmar jadeitite of Jurassic age? A result from incompletely recrystallized inherited zircon
Lithos, 2013Abstract Zircons from two Myanmar jadeitite samples were separated for texture, mineral inclusion, U–Pb dating and trace element composition analyses. Three types of zircons, with respect to U–Pb isotope system, were recognized. Type I zircons are inherited ones, yielding an igneous protolith age of 160 ± 1 Ma; Type II zircons are metasomatic ...
J G Liou
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Lithos, 2018
Abstract The majority of granitic magmas generated during the Grenville Orogeny (1.2–1.0 Ga) are extremely zirconium rich (Zr contents often >500 ppm) and thus typically contain very abundant zircon. The extreme zircon fertility of Grenville granitoids appears to be unique in the geological record – no major magmatic event before or after produced on
S D Samson, D P Moecher
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Abstract The majority of granitic magmas generated during the Grenville Orogeny (1.2–1.0 Ga) are extremely zirconium rich (Zr contents often >500 ppm) and thus typically contain very abundant zircon. The extreme zircon fertility of Grenville granitoids appears to be unique in the geological record – no major magmatic event before or after produced on
S D Samson, D P Moecher
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Sedimentary Geology, 2001
Abstract SHRIMP U–Pb zircon dates are combined with an examination of the age distribution patterns and provenance of both detrital zircons and of zircon xenocrysts in granites to investigate the development of the Archaean Mallina Basin, in the granite–greenstone terrain of the Pilbara Craton, northwestern Australia.
R H Smithies, D R Nelson
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Abstract SHRIMP U–Pb zircon dates are combined with an examination of the age distribution patterns and provenance of both detrital zircons and of zircon xenocrysts in granites to investigate the development of the Archaean Mallina Basin, in the granite–greenstone terrain of the Pilbara Craton, northwestern Australia.
R H Smithies, D R Nelson
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Zircon inheritance, sources of Devonian granitic magmas and crustal structure in central Victoria
Australian Journal of Earth Sciences, 2022 In central Victoria, inherited zircon in Devonian igneous rocks and detrital zircon in metasedimentary country rocks and an amphibolite-facies xenolith show that Mesoproterozoic parts of the underlying Selwyn Block cannot be the source for all the ...
J. D. Clemens, G. Stevens, L. M. Coetzer
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Zircon stability grids in crustal partial melts: implications for zircon inheritance
Contributions to Mineralogy and Petrology, 2021Zircon inheritance is a common phenomenon in igneous rocks, although more frequent in granitoids. Zircons inherited from granite magmas mostly come from the source, not from wall rocks or xenoliths. Consequently, they can provide invaluable information about the source materials, melting temperature, and melt segregation conditions.
Fernando Bea +4 more
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Lithos, 2005 SHRIMP U–Pb zircon studies on two post-collisional granitic plutons and reassessment of the data previously reported for two anatectic gneissic granites are used to assess the late Neoproterozoic history of the Florianόpolis Batholith, southern Brazil ...
McNaughton, Neal +2 more
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