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Tridymite from rhyolite

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Series: GSA Memoirs
Published: 01 January 1958
DOI: 10.1130/MEM74-p1
.... Tridymite and albite are the stable crystalline phases at the liquidus below 300 kg/cm 2 pressure, whereas at higher pressures high quartz and albite are the stable phases. The change from tridymite to quartz is a consequence of the liquidus lowering by water dissolving in the melt together...
Journal Article
Published: 01 May 2013
American Mineralogist (2013) 98 (5-6): 977–985.
...Liberto De Pablo Galan; Mercedes Doval; Angel La Iglesia; Jesus Soriano; Lourdes Chavez Abstract Cristobalite-tridymite blade nanocrystals cemented by SiO 2 -glass and tridymite nanocrystals fill separately SiO 2 -glass spherules released by explosive volcanism, in rhyolitic tuffs from the Province...
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Journal Article
Published: 01 August 2014
Mineralogical Magazine (2014) 78 (4): 1029–1041.
... that is zoned compositionally from high-silica rhyolite to latite. During cooling of the tuff, escaping vapour produced lithophysae (former gas cavities) lined with an assemblage of tridymite (commonly inverted to cristobalite or quartz), sanidine and locally, hematite and/or garnet. Vapour-phase topaz...
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Journal Article
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1153–1164.
...Audrey M. Martin; Etienne Médard; Bertrand Devouard; Lindsay P. Keller; Kevin Righter; Jean-Luc Devidal; Zia Rahman Abstract This study investigates the oxidation of fayalite Fe 2 2+ SiO 4 that is present in lithophysae from a rhyolite flow (Obsidian Cliffs, Oregon). Textural, chemical...
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Journal Article
Published: 01 April 2016
Mineralogical Magazine (2016) 80 (2): 269–275.
... trydimite crystals and subordinate mafic minerals. In this context, amphibole crystals occur in vugs, either isolated from or perched on tridymite. Associated minerals are tridymite, todorokite, magnetite and hematite. The refined and analysed crystal of this work has the code 1231 in the amphibole...
FIGURES
Journal Article
Published: 01 July 2015
American Mineralogist (2015) 100 (7): 1533–1543.
.... The presence of tridymite or cristobalite would indicate rapid crystallization at high temperature. Quartz would indicate crystallization at low temperature or perhaps intrusive, slow crystallization, allowing for the orderly transformation from high-temperature silica polymorphs (tridymite or cristobalite...
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Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(07)
EISBN: 9780813756240
... tholeiitic Fe-enrichment suite that ranges from primitive olivine tholeiite through transitional basalt, basaltic andesite, andesite, and icelandite to rhyolite. The mafic magmas were partial melts of the plume and lithospheric mantle, variably modified by crystal fractionation in crustal chambers...
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Journal Article
Published: 01 August 2009
Russ. Geol. Geophys. (2009) 50 (8): 703–721.
... ± tridymite on the side of paralava. The zones away from clinker are coarse-grained and contain fayalite, sekaninaite, hercynite, glass, magnetite, and tridymite ( Figs. 3 and 4 ). Some vugs host perfectly faceted crystals of clinoferrosilite, fayalite, sekaninaite, and tridymite, occasionally coated...
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Journal Article
Published: 01 August 2007
American Mineralogist (2007) 92 (8-9): 1325–1333.
... cristobalite tridymite T able 2. Chemical composition of the opal samples studied Oxide wt% S1 S2 S3 S4 S5 S6 S7 * Water content from TGA data. SiO 2 98.10 97.90 99.45 94.31 87.99 94.80 94.65 Al 2 O 3 <0.03 0.19 0.12 0.21 0.60 1.09 1.22 Fe...
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Journal Article
Published: 01 February 1955
American Mineralogist (1955) 40 (1-2): 64–69.
...George Switzer; W. F. Foshag Abstract Tin ores from the Santín mine, Guanajuato, Mexico, contain a new mineral having the chemical composition Zn Sb 2 O 6 . Chemical analysis gave ZnO 20.07, Sb 2 O 5 80.49 SiO 2 and Al 2 O 3 n.f.; sum 100.56 per cent. It occurs in small pale to dark brown...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1938
GSA Bulletin (1938) 49 (12_1): 1829–1862.
...CHARLES M. GILBERT Abstract Welded rhyolite tuff, of Pleistocene age and having an areal extent of 400 square miles and an average thickness of 500 feet, occurs between Bishop and Mono Lake in eastern California. In its upper portions, pumice lapilli are imbedded in a porous vitric-crystal matrix...
Journal Article
Published: 01 October 2012
American Mineralogist (2012) 97 (10): 1685–1699.
... ; Castro and Dingwell 2009 ). Volcanic glasses record the full spectrum of erupted compositions from basaltic (e.g., Pick and Tauxe 1993 ) to rhyolitic (e.g., Ross and Smith 1955 ) and more alkaline compositions (Pantellerite; Noble 1968 ). The products of explosive volcanic eruptions may accumulate...
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Series: GSA Reviews in Engineering Geology
Published: 01 January 2007
DOI: 10.1130/2007.4118(09)
EISBN: 9780813758183
...-feldspar + tridymite ± apatite. The silica content of the paralavas is similar to that of basalt, whereas the high calcium content suggests similarity to anorthosite. The occurrence of glass in the paralava is evidence for melting. The glasses are compositionally similar to rhyolites and more acidic melts...
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Journal Article
Published: 01 October 2020
American Mineralogist (2020) 105 (10): 1547–1555.
... probe of a TiO 2 melt-sat that could be applied directly to natural quartz-glass pairs (e.g., melt inclusions in quartz). This would require an experimental approach that can crystallize quartz large enough to analyze from rhyolitic composition melts. However, experimental...
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Journal Article
Journal: Geosphere
Published: 01 February 2016
Geosphere (2016) 12 (1): 58–113.
... reported in the Soldier Meadow Tuff by Korringa (1973) , and are relatively abundant in the late-stage metaluminous rhyolite lavas. The most common vapor-phase minerals are tridymite, alkali feldspar, and Na amphibole ( Fig. 9 ). Vapor-phase tridymite can be distinguished from phenocrystic quartz...
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Image
Photos of Obsidian Cliffs <b>rhyolite</b> lava flow. ( a ) General view of the nor...
Published: 01 May 2015
Figure 1 Photos of Obsidian Cliffs rhyolite lava flow. ( a ) General view of the northern cliff and its debris talus, taken from an andesite lava flow of the Collier Cone (foreground). ( b ) Picture of a glassy obsidian rock observed at the summit of Obsidian Cliffs lava flow, containing white
Image
HRSEM images <b>from</b> the <b>rhyolitic</b> tuff: ( a ) 1 silica glass spherule (compos...
Published: 01 May 2013
Figure 3 HRSEM images from the rhyolitic tuff: ( a ) 1 silica glass spherule (composition 3.30.1 in Table 3 ); ( b ) 1 cristobalite-tridymite blade crystals in SiO 2 -glass spherule (composition 3.28.1 in Table 3 ); ( c ) 1 cristobalite-tridymite blade crystals in lepyspheres packed in vesicle
Image
X-ray patterns of the <b>rhyolitic</b> tuff <b>from</b> Location 3, showing peaks of cris...
Published: 01 May 2013
Figure 2 X-ray patterns of the rhyolitic tuff from Location 3, showing peaks of cristobalite (4.10, 4.05, 3.97, 2.46 Å), tridymite (4.10 Å), smectite (14.99, 4.48, 1.50 Å), heulandite-clinoptilolite (9.08, 7.93, 3.97, 2.97, 2.79 Å), plagioclase (3.22, 3.77 Å), and K-feldspar (3.34, 3.22, 3.77 Å).
Journal Article
Published: 01 October 2018
Mineralogical Magazine (2018) 82 (5): 1147–1168.
.... Igneous rocks in Iceland with δ 18 O values significantly higher than unaltered oceanic crust (~5.7‰) are therefore rare. Here we report on rhyolitic intra-caldera samples from a cluster of Neogene central volcanoes in Borgarfjörður Eystri, Northeast Iceland, that show whole-rock δ 18 O values between...
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Journal Article
Journal: Clay Minerals
Published: 01 December 2005
Clay Minerals (2005) 40 (4): 463–480.
... ( Fernández-Soler, 1992 ). Radiometric dating of the volcanic events at Cabo de Gata indicates ages of 15 to 7 Ma ( Bellon et al. , 1983 ; Di Battistini et al. , 1987 ; Zeck et al. , 1999 ). The volcanism is of calc-alkaline type, with rocks varying in composition from andesites to rhyolites...
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