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synneusis

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Journal Article
Published: 01 February 2001
Mineralogical Magazine (2001) 65 (1): 71–79.
...P. Alexandrov Abstract Some zircons from the Hercynian Soultz granite, NE France, exhibit complex structures, with double cores and oscillatory-banded overgrowths. These glomeroporphyritic crystals are uncommon for zircons, in which synneusis has not previously been described. The cores...
FIGURES | View All (5)
Journal Article
Published: 01 June 1979
American Mineralogist (1979) 64 (5-6): 514–518.
...R. J. Stull Abstract Synneusis, the drifting together and systematic attachment of crystals in a melt, is involved in three of the known origins for mantled feldspars: (1) overgrowth, (2) exsolution, and (3) filling of skeletal plagioclase. Quartz latite dikes of the Chocolate Mountains, California...
Journal Article
Published: 01 April 1967
American Mineralogist (1967) 52 (3-4): 529–536.
...Joseph A. Vance; John P. Gilreath Abstract Segregation of early crystals into clusters exhibiting glomero-porphyrit-ic or synneusis structure characterizes many igneous rocks and is especially striking in porphyries. These widespread, but largely neglected, structures are of general petrologic...
Journal Article
Journal: Geology
Published: 20 August 2019
Geology (2019) 47 (10): 948–952.
... processes (e.g., synneusis, accumulation during settling). We tested these hypotheses by quantifying the relative orientation of adjacent crystals using electron backscatter diffraction. Both olivine aggregates from Kīlauea volcano (Hawaiʻi, USA) and chromite aggregates from the Bushveld Complex (South...
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Journal Article
Published: 27 November 2017
European Journal of Mineralogy (2017) 29 (6): 939–947.
... frequency of this twin and its occurrence as both contact and penetration twin, and as primary or synneusis twin. In the case of triclinic polymorphs, the common substructure is much less satisfactory and the Carlsbad twin is probably inherited from the monoclinic phases, accompanied by transformations...
FIGURES
Image
SEM BSE image of unpolished raw surfaces of Lipari obsidian: elongated hede...
Published: 01 May 2004
Fig. 4. SEM BSE image of unpolished raw surfaces of Lipari obsidian: elongated hedenbergitic pyroxene crystal (grey in colour) in synneusis with an euhedral crystal of magnetite (white in colour).
Journal Article
Journal: Geology
Published: 03 July 2024
Geology (2024) 52 (9): 712–716.
... the systematic low-energy crystallographic relationships expected from attachment by synneusis in melt-rich environments where crystals have space to rotate. We use electron backscatter diffraction to quantify the crystal orientations and find that the megacrysts’ plagioclase inclusions do occupy these preferred...
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Image
Six zoned plagioclase phenocrysts (numbered) in parallel, apparent “synneus...
Published: 01 March 2011
Figure 16. Six zoned plagioclase phenocrysts (numbered) in parallel, apparent “synneusis” orientation, set in a much finer-grained groundmass of anhedral quartz, K-feldspar, and plagioclase. Xu et al. ( 2009 , their fig. 3 a ) referred to this as a “tower-shape structure.” Crossed polars; base
Image
“Glomeroporphyritic” aggregate of zoned plagioclase crystals in a much fine...
Published: 01 March 2011
Figure 17. “Glomeroporphyritic” aggregate of zoned plagioclase crystals in a much finer-grained groundmass of anhedral quartz, K-feldspar, and plagioclase. Some of the crystals could be in a potential “synneusis” relationship, but most appear to be random and so could have nucleated on each other
Journal Article
Published: 01 February 2015
American Mineralogist (2015) 100 (2-3): 385–395.
..., or synneusis, but rather a result of growth defects introduced during the incipient stages of crystallization. We suggest internal structural defects (twins) control macroscopic morphological defects (embayments, swallowtails, and melt inclusions) as a result of the high energy of the twin plane boundary...
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Journal Article
Journal: Geosphere
Published: 22 December 2021
Geosphere (2022) 18 (1): 1–18.
.... The high, and statistically significant, binary touching factors and shared perimeter factors suggest a strong physical or chemical control on their spatial association. We evaluate random collisions in magma (synneusis), heterogeneous nucleation processes, induced nucleation in passively enriched boundary...
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Journal Article
Journal: Geology
Published: 22 November 2021
Geology (2022) 50 (3): 295–299.
... relationships, representing low grain-boundary energy configurations. These clusters must have formed by synneusis in a magmatic environment where crystals could have moved freely, rotating into low-energy orientations on contact. We argue that this not only demonstrates that 100-m-scale crystal-poor and liquid...
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Journal Article
Published: 01 February 2020
American Mineralogist (2020) 105 (2): 194–226.
... commonly thought to signify crystal resorption, crystal deformation, synneusis, or fluctuating P–T conditions are here a consequence of rapid disequilibrium crystal growth. Most importantly, we discover that an overarching process of disequilibrium crystallization is manifested among these crystal features...
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Journal Article
Published: 01 August 2015
American Mineralogist (2015) 100 (8-9): 1778–1789.
... and that many quartz crystals were subject to one or more resorption events. The process of quartz crystals with different magmatic histories coming together into common relative orientations to form clusters is indicative of oriented quartz synneusis and suggests a history of crystal accumulation. The quartz...
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Journal Article
Published: 01 March 2011
The Journal of Geology (2011) 119 (2): 127–142.
...Figure 16. Six zoned plagioclase phenocrysts (numbered) in parallel, apparent “synneusis” orientation, set in a much finer-grained groundmass of anhedral quartz, K-feldspar, and plagioclase. Xu et al. ( 2009 , their fig. 3 a ) referred to this as a “tower-shape structure.” Crossed polars; base...
FIGURES | View All (17)
Journal Article
Published: 01 December 2002
Mineralogical Magazine (2002) 66 (6): 929–939.
...-spike zoning in plagioclase (sample GM1). Note the non-sericitized Na-core and later calcic spike zone. Scale bar is 1 mm. ( f ) Lath trail in K-feldspar megacryst (sample GM1). Scale bar is 1 mm. ( g ) Synneusis with the attachment of up to nine individual plagioclase crystals enclosed in K-feldspar...
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Journal Article
Journal: Geology
Published: 01 May 1991
Geology (1991) 19 (5): 437–440.
...Patrick Roycroft Abstract Euhedral muscovites from the granites of the Leinster batholith, Ireland, have zone textures that clearly demonstrate their magmatic origin. These textures include corrosion, synneusis, development of transient faces, zone thickening, face widening, and rational...
Journal Article
Published: 01 March 1989
Jour. Geol. Soc. India (1989) 33 (3): 223–227.
... composition. During this process, zoned plagioclases came in contact with one another and resulted in synneusis. Partial resorption resulted in truncated zones followed by crystallisation of a more calcic rim. Copyright © 1989 Geological Society of India 1989 Geological Society of India JOURNAL...
Journal Article
Published: 01 October 1986
Jour. Geol. Soc. India (1986) 28 (4): 320–324.
.... The process of synneusis may result in parallel growths or attachment of zircons that have initially undergone separate growth histories. The occurrence of primary growths in paragneisses and migmatites is due to their derivation from magmatic sources and their survival during mechanical transportation...
Image
(A–B) Backscatter electron (BSE) images of olivine aggregates consisting of...
Published: 20 August 2019
), allowing assessment of facial attachments. In this case, crystals are predominantly attached along {110}-{110} faces. Note the presence of a misaligned crystal in C within an aggregate mostly formed of crystals with similar orientations. If this aggregate formed by dendritic growth, synneusis would also