hornblende
From: The Columbia Encyclopedia, Sixth Edition
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Date: 2008
hornblende see amphibole .
Author not available, HORNBLENDE.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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... plagioclase crystals are resorbed, whereas hornblende and biotite are euhedral. Fe-Ti oxides ... and evacuation. Chemical zoning within hornblende crystals is consistent with rimward ... allowed the growth of reverse-zoned hornblende. Microdiorite lithic fragments in the ...
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... seriate to porphyritic, biotite [+ or -] hornblende, titanite-bearing granite with abundant ... serie a porphyrique de biotite [+ or -] hornblende comportant une abondance d'enclaves ... King 1977; Wones 1991; Stewart 1998). Hornblende geobarometry calculations (Lux et al ...
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... deformation events affecting their host. Ar-Ar hornblende ages from the post-Grenville metadolerites ... Grampian deformation. Younger Ar-Ar hornblende and Rb-Sr mica ages record post-Grampian ... disturbances on the U-Pb system. Ar-Ar hornblende and Rb-Sr hornblende and mica analyses ...
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Age and evolution of late Mesozoic metamorphic core complexes in southern Siberia and northern Mongolia
Journal of the Geological Society; 1/1/2008; Donskaya, T V; Windley, B F; Mazukabzov, A M; Kröner, A; Sklyarov, E V; Gladkochub, D P; Ponomarchuk, V A; Badarch, G; Reichow, M K; Hegner, E; 10487 words;
... Ar/^sup 39^Ar ages of 133.5 1.8 Ma of hornblende from amphibolite and 122.6 1.8 Ma of ... mylonite and ultramylonite. Syntectonic hornblende from amphibolite of the footwall of ... 40^Ar-^sup 39^Ar isotopie analyses of hornblendes and biotites from foliated and mylonitized ...
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... facies. Amphibolite facies rocks (garnet-hornblende gneiss and amphibolite from Rudnik and ... pseudomorphs of chlorite with relicts of hornblende or by glaucophane. The rock with hornblende has relatively high amounts (10 vol%) of ...
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... sup.40]Ar/[[blank].sup.39]Ar des elements de Ia hornblende. L'age de 646,7 2,7 Ma obtenu par datation au ... blank].sup.40][Ar/.sup.39] Ar release spectra of hornblende The hornblende separates and flux monitors (SGB-7; muscovite ...
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... transport direction of the fault (Fig. 5a). Hornblende from sample CM3 yields an age range ... be biotite. The significance of the hornblende analysis in terms of timing of argon ... Closure of argon systematics within the hornblende (ST44) occurred after 517 6 Ma, which ... CM44 and CM35, Fig. 7c). Analyses ...
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Discussion on SHRIMP U-Pb zircon dating of the exhumation of the Lizard Peridotite and its emplacement over crustal rocks: Constraints for tectonic models
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... zircon age for metabasaltic Landewednack Hornblende Schist from Pen Olver, only 1.1 km ENE ... Thrust (Jones 1994) that separates the hornblende schists from the Old Lizard Head Series ... from the Landewednack to the Traboe Hornblende Schist units, the latter of which widely ...
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Magmatic vs. hydrothermal origin of fluorites from Vlastejovice, Bohemian Massif
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... Abundant violet to colourless fluorite with hornblende and garnet were formed during pegmatite ... of garnet (grossular-andradite), Ca-hornblende, titanite, allanite and enormous quantities ... up to 0.72 wt. %) were described from hornblende (Zcek - Povondra 1991) and titanite ...
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... leucocratic gneiss from darker grey hornblende-bearing orthogneiss with numerous layers ... of homogeneous, variably tectonized, hornblende-biotite diorite (Garde & Steenfelt ... Paleproterozoic age and Palaeoproterozoic hornblende K-Ar and Ar-Ar ages (Rasmussen & ...
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Neotethyan ophiolitic rocks of the Anatolides of NW Turkey and comparison with Tauride ophiolites
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... alluvium. The ophiolites tectonically overlie the same olistostrome. Geological maps (Fig. 3a and b) of the ophiolite from the Besdegirmen area show locations ... calcic amphiboles in the coarser-grained gabbros. They are usually magnesio-hornblendes (Leake 1978) but a few have tschermakitic hornblende and ...
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Journal of the Geological Society; 1/1/2003; Holness, M B; Isherwood, C E; 7004 words;
... complex, resulted in the breakdown of hornblende to pyroxene, plagioclase, biotite and ... a decimetre scale, are: (1) a basic hornblende-plagioclase gneiss, with or without ... amphibole; (2) a tonalitic biotite-bearing hornblende gneiss representing an intermediate ...
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