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schlieren

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Journal Article
Published: 01 February 2024
Russ. Geol. Geophys. (2024) 65 (2): 195–213.
... and magnesium carbonates. Furthermore, compositional zoning of Sr in apatite and Ba in phlogopite and K-feldspar is considered to have resulted from the immiscibility. Separation of the carbonate–fluorite melt fraction might have led to formation of the carbonatite and fluorite–carbonatite schlieren and gangues...
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Journal Article
Published: 29 June 2022
Geological Magazine (2022) 159 (9): 1621–1637.
... to gently dipping layers (S ign1 ) comprise K-feldspar megacrysts, plagioclase and quartz, with the base of each layer defined by segregations of biotite. S ign2 consists of trough cross-bedded layers composed of K-feldspar phenocrysts, plagioclase and quartz with biotite schlieren defining the base of each...
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Journal Article
Journal: Geology
Published: 04 September 2020
Geology (2021) 49 (1): 86–90.
... by electron probe span the same compositional ranges as in the host granodiorite. Schlieren (irregular streaks in plutonic igneous rock that differ in composition from the host rock) and mafic layers throughout the Sierra Nevada batholith ( Figs. 1E and 1F ) follow the same chemical trends as LSs but do...
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Journal Article
Journal: Geosphere
Published: 14 August 2019
Geosphere (2019) 15 (5): 1677–1702.
... formation and deformation (faulting and folding) within a solidifying upper-crustal magma mush. This zone consists largely of coupled melanocratic (or schlieren) and leucocratic bands hosted within the 95.6 ± 1.5 Ma Kinney Lakes granodiorite ( Leopold, 2016 ), with orientations approximately parallel...
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Journal Article
Journal: Geology
Published: 01 January 2016
Geology (2016) 44 (1): 31–34.
... muscovite-breakdown melts and gabbroic magmas; B—unmelted metasedimentary unit; C—muscovite-breakdown melting zone at 650–760 °C (metatexite); D—biotite-breakdown melting zone (schlieren migmatites) undergoing convection at 760–900 °C (garnet-bearing schlieren migmatites); E—mixing zone between crustal...
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Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0034(04)
EISBN: 9780813756349
... common magmatic structures in the Tuolumne Intrusive Complex after Paterson (2009). (A) Stationary tube with schlieren-banded rings; (B) migrating tube with schlieren-banded rings; (C) pipe with bounding weak schlieren; (D) local diapirs with weak schlieren band in head and narrow tails; (E) plume head...
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Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0034(06)
EISBN: 9780813756349
...), and felsic layers associated with schlieren. Mid-ocean ridge basalt (MORB)–normalized spider diagrams show large-ion lithophile element (LILE) enrichment and also certain negative anomalies typical of most arc magmas, such as for the high field strength elements Ti, Ta, and Nb. The latter is consistent...
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Series: GSA Memoirs
Published: 01 January 2014
DOI: 10.1130/2014.1211(11)
... of biotite-hornblende tonalite that lacks K-feldspar. The pluton is characterized by ubiquitous schlieren that range from black hornblende-biotite rock to near-white quartz-plagioclase rock, imparting an extreme outcrop-scale mineral and chemical heterogeneity to the pluton. Geometrically, the schlieren...
Journal Article
Journal: Geology
Published: 01 March 2010
Geology (2010) 38 (3): 211–214.
... of Indochina. The shocked quartz and the Zr phase are interpreted as relicts of the target rock. Furthermore, the internal homogeneity of Australasian microtektites in terms of abundance of relict mineral inclusions, vesicles, and schlieren increases with distance from Indochina. This finding strengthens...
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Journal Article
Journal: Geosphere
Published: 01 December 2009
Geosphere (2009) 5 (6): 496–527.
... magmas, are often associated with the formation of schlieren rich in accessory and mafic minerals, and are associated with filter pressing and accumulations of crystals with diverse magma histories and ages. Together they represent a network in which channelized flow occurred in an existing chamber...
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Journal Article
Published: 01 February 2009
The Canadian Mineralogist (2009) 47 (1): 63–80.
... of magmatic Ni sulfide mineralization hosted by ultramafic cumulate rocks. Chromian spinel is a common accessory mineral (<0.5–4 vol.%) in the ultramafic rocks of the intrusion and is locally found as massive chromitite schlieren, pods, and rare layers in dunite. Although the composition of spinel from...
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Journal Article
Published: 01 June 2006
Russ. Geol. Geophys. (2006) 47 (6): 715–733.
...”, and “salic” varieties; III — “salic”, including coesite-bearing glasses derived from quartz. The glasses contain “shadows” of target rock minerals as well as high-temperature minerals: lechatelierite schlieren and globules of magnetite, native Fe, zircon, and rutile (melting/decomposition points, °C...
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Journal Article
Published: 01 May 2004
American Mineralogist (2004) 89 (5-6): 841–856.
... of biotite-rich schlieren along the marginal parts of the stock suggest that magma flow was parallel to the walls of the chamber, whereas turbulent or plume-like flows are indicated by curved, circular, and ladder-dike schlieren. Geochemical variation among the granites can be attributed to fractional...
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Journal Article
Published: 01 July 2002
European Journal of Mineralogy (2002) 14 (4): 715–731.
... (a monzogranite, interpreted as a cumulate) to the external La Clarté granite (a syenogranite, interpreted as a residual liquid) ( Barrière, 1981 ). Several coeval mafic hectometre- to kilometre-size bodies and numerous schlieren are present in the Traouiéros granite. Pegmatitic pods are locally abundant...
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Journal Article
Journal: GSA Bulletin
Published: 01 April 2001
GSA Bulletin (2001) 113 (4): 508–520.
... cross sections of several superposed cylindrical magma channels (possibly feeders of diapirs and plume heads). A fundamental feature of the structures in the Tavares pluton is that they are well delineated by mafic schlieren developed at active channel margins. We postulate a new model for the origin...
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Journal Article
Published: 01 December 1999
American Mineralogist (1999) 84 (11-12): 1781–1792.
Journal Article
Journal: Geology
Published: 01 July 1993
Geology (1993) 21 (7): 587–590.
.... In many plutons, however, small-scale crystal cumulates have been preserved as layered schlieren and in microcosm may allow an assessment of the importance of crystal fractionation in their host pluton's development. Small, widely separated patches of schlieren in the Tuolumne Intrusive Series, Yosemite...
Journal Article
Journal: Economic Geology
Published: 01 July 1990
Economic Geology (1990) 85 (4): 765–793.
...David C. Peck; Reid R. Keays Abstract Three distinctive chromitite occurrences are recognized from the Cambrian mafic-ultramafic Heazlewood River Complex, Tasmania. Type I chromitite represents very thin schlieren comprising Cr-rich spinel and is hosted by primitive, olivine-rich cumulates. Type II...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1989
GSA Bulletin (1989) 101 (11): 1493–1506.
... the folding were internal. The response to the stresses was by ductile deformation (folding) and only locally by fracturing (schlieren, megacrystic dikes) during the late stages of consolidation. The magma behaved as a Bingham substance during emplacement, alternately plastic or brittle, depending...
Journal Article
Journal: GSA Bulletin
Published: 01 August 1987
GSA Bulletin (1987) 99 (2): 272–291.
... intrusion are present in the granodiorite. Where the host is relatively mafic or where the local-scale proportion of mafic magma is large, contacts are zones of extensive hybridization that contain both enclaves and hybrid schlieren. Uncontaminated mafic intrusions have high-alumina basaltic compositions...