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miarolitic cavities

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Journal Article
Published: 01 March 2018
American Mineralogist (2018) 103 (3): 480–488.
... of miarolitic cavities in a granophyre from Cuasso al Monte (Italy). The results suggest that temperatures in the range 100–250 °C and acidic conditions characterized the formation of anatase and that the preservation of this metastable phase was due to the presence of Nb (Nb/Ti atomic ratio ∼0.032). We also...
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Journal Article
Published: 01 June 2005
The Canadian Mineralogist (2005) 43 (3): 1093–1105.
...Daniel E. Kile Abstract Clay samples from 105 cavities within miarolitic granitic pegmatites throughout the Pikes Peak batholith, in Colorado, were analyzed by powder X-ray diffraction (XRD). Smectite (beidellite), illite, and kaolinite were found within the cavities. Calculation of crystallite...
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Journal Article
Published: 01 June 1999
American Mineralogist (1999) 84 (5-6): 718–724.
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Examples of miarolitic cavities. Top row, left to right: miarolitic cavity (25 cm across) containing red elbaite (rubellite) crystals (up to 5 cm in length) in the Himalaya dike, San Diego County, California; photo by Gene Foord; cavity in the Pederneira pegmatite, Minas Gerais, Brazil, about 80 cm wide, insert shows single indicolite tourmaline from this pocket, photos by Marco Lorenzoni. Bottom row, left to right: miarolitic cavity with 20 cm spodumene crystal, Ocean View mine, San Diego County, photo Brendan Laurs; miarolitic cavity, Mount Mica pegmatite, Maine (50 cm wide), inset shows green elbaite (12 cm long) just recovered from pocket, photos by Skip Simmons
Published: 01 August 2012
F igure 4 Examples of miarolitic cavities. Top row, left to right: miarolitic cavity (25 cm across) containing red elbaite (rubellite) crystals (up to 5 cm in length) in the Himalaya dike, San Diego County, California; photo by G ene F oord ; cavity in the Pederneira pegmatite, Minas Gerais
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(a) Interconnected miarolitic cavities (pinch-and-swell like structure) along a flow-like structural pattern of the pluton (N80°E–SSE dip; view to the SSE). (b) Other interconnected pegmatitic pods with miarolitic cavities, hosted in primary magmatic conjugate fractures during the ductile cooling stage; some of these types of melt-controlled emplacements show fracture cleavage evidence.
Published: 29 September 2023
Fig. 2. (a) Interconnected miarolitic cavities (pinch-and-swell like structure) along a flow-like structural pattern of the pluton (N80°E–SSE dip; view to the SSE). (b) Other interconnected pegmatitic pods with miarolitic cavities, hosted in primary magmatic conjugate fractures during the ductile
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Published: 20 December 2018
TABLE 13. ANALYSES OF HYPOGENE CLAY THAT FORMS THE MATRIX OF THE MIAROLITIC CAVITIES
Journal Article
Published: 01 March 2017
The Canadian Mineralogist (2017) 55 (2): 195–206.
...Gary Zito; Sarah L. Hanson Abstract A miarolitic cavity in a pegmatite in Cheyenne Canyon, El Paso Co., Colorado has an unusual mineral assemblage that includes epitaxial genthelvite overgrowths on danalite cores. The cavity was lined with white microcline crystals with clear epitaxial albite...
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Pegmatite minerals from miarolitic cavities of the Bodengo area. (a) Smoky quartz with microcline and muscovite. (b) Terminated gem-quality beryl (aquamarine). (c) Twinned crystal of wodginite.
Published: 01 April 2014
Fig. 7 Pegmatite minerals from miarolitic cavities of the Bodengo area. (a) Smoky quartz with microcline and muscovite. (b) Terminated gem-quality beryl (aquamarine). (c) Twinned crystal of wodginite.
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Outcrop photograph showing numerous secondary miarolitic cavities, where fluorite has been leached out. Width of view is approximately 15 cm.
Published: 01 December 2012
Fig. 5 Outcrop photograph showing numerous secondary miarolitic cavities, where fluorite has been leached out. Width of view is approximately 15 cm.
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Published: 01 June 2005
TABLE 1. INVENTORY OF SELECTED CLAY SAMPLES MIAROLITIC CAVITIES, PIKES PEAK BATHOLITH, COLORADO
Journal Article
Published: 23 October 2018
The Canadian Mineralogist (2018) 56 (4): 425–449.
... are famous for spectacular mineral specimens of schorl, foitite, aquamarine, topaz, fluorite, and jeremejevite. Mineral samples from three areas where artisanal mining exposed miarolitic cavities were examined: Lion's Head (LH), Hohenstein Gorge (HG), and Tubusis (TB). Tourmaline, biotite, and associated...
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Journal Article
Journal: Economic Geology
Published: 01 November 1991
Economic Geology (1991) 86 (7): 1401–1433.
... of disseminated mineralization.The granites contain miarolitic cavities generally less than 5 mm in diameter which range from more than 10 vol percent in the upper facies of the Lease Granite to less than 1 vol percent in the deeper part of the Bobbejaankop Granite. Miarolitic cavities are filled or partially...
Journal Article
Published: 01 June 1999
American Mineralogist (1999) 84 (5-6): 782–789.
... investigated, gadolinite-group minerals are hosted in massive pegmatite, in aplite, and in miarolitic cavities having different degrees of evolution. The petrological relations indicate that progressive crystallization has occurred from magmatic through to hydrothermal conditions. At Baveno, Ce-rich gadolinite...
Journal Article
Published: 01 April 1998
The Canadian Mineralogist (1998) 36 (2): 463–482.
... of 1.693 in annite of the host granite to 1.577 in zinnwaldite and ferroan lepidolite of the miarolitic cavities, which correlates with a progressively decreasing content of Fe. A comparison of optical and compositional data for micas from localities throughout the PPB indicates a variation in geochemical...
Journal Article
Published: 01 October 1996
The Canadian Mineralogist (1996) 34 (5): 1011–1014.
... in miarolitic cavities, grading to euhedral Li- and F-poor arfvedsonite. Fine-grained, fibrous, light blue-gray riebeckite occurs as a late-stage hydrothermal filling in the miarolitic cavities. The early, Li-rich, fluor-arfvedsonite has: a 9.836(5), b 17.997(7), c 5.316(4) Aa, beta 103.735(4) degrees , V...
Journal Article
Published: 01 August 2012
The Canadian Mineralogist (2012) 50 (4): 1025–1054.
... toward the miarolitic center of the thicker (Main) dike, but increase to ∼500°C in the thinner (Swamp) dike. Fluid inclusions within quartz and topaz from miarolitic cavities of the Main dike contain cryolite, arsenides, arsenates, pollucite, and borates, including Cs borate, the latter of which...
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Comparison of fluid inclusion compositions analyzed from miarolitic cavities vs. those analyzed from veins in the same pluton. (a). Brine compositions from 1 miarolitic cavity vs brine compositions from Sn-W-(Bi-Au) mineralized veins in the Mole Granite, Australia. (b). Composition of ID-type fluids from a pegmatite pocket vs. ID-type fluids from W-Sn-Bi mineralized veins in the Naegi granite, Japan. (c). Composition of ID-type fluids from miarolitic cavities vs. brine compositions from a vein in the Glitrevann granite, Norway.
Published: 01 September 2019
Fig. 12. Comparison of fluid inclusion compositions analyzed from miarolitic cavities vs. those analyzed from veins in the same pluton. (a). Brine compositions from 1 miarolitic cavity vs brine compositions from Sn-W-(Bi-Au) mineralized veins in the Mole Granite, Australia. (b). Composition of ID
Journal Article
Journal: Geology
Published: 01 May 2002
Geology (2002) 30 (5): 459–462.
... by fluid inclusions in a single zoned quartz crystal from a miarolitic cavity within a porphyritic leucogranite hosting the Industrialnoe tin deposit, northeastern Russia, were studied by using modern in situ analytical methods (laser Raman spectroscopy, proton-induced X-ray emission). The fluid inclusions...
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Journal Article
Journal: Economic Geology
Published: 01 June 2018
Economic Geology (2018) 113 (4): 803–824.
... in quartz phenocrysts, matrix quartz, pegmatitic quartz, and euhedral quartz crystals in miarolitic cavities. The melt inclusions have rhyolitic compositions (72.6–77.7 wt % SiO 2 ) and show a wide range of Cs contents, from 10 to up to 2,000 ppm, implying melt entrapment at crystallinities up to >99...
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Series: GSA Special Papers
Published: 01 January 1990
DOI: 10.1130/SPE246-p233
... paragenetically in individual veinlet and placer samples. The δ 18 O values of temporally overlapping cristobalite in veinlets, however, range from 9.7 to 11.8 ‰ and increase paragenetically. The δ 18 O values for quartz in miarolitic cavities containing cassiterite are nearly the same as those for adjacent...