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pseudoleucite syenites

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Journal Article
Published: 24 November 2020
The Canadian Mineralogist (2020) 58 (5): 597–623.
... Zone during the Caledonian Orogeny. Some of the Loch Borralan rocks are ultrapotassic and contain pseudoleucite, i.e ., a pseudomorph of alkali feldspar and nepheline after leucite. In total, 25 samples have been investigated, representing garnet-bearing pseudoleucite syenites and accompanying rock...
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Image
Paragenetic sequence of garnet-bearing <b>pseudoleucite</b> <b>syenites</b>. Thick bars i...
Published: 24 November 2020
Fig. 2. Paragenetic sequence of garnet-bearing pseudoleucite syenites. Thick bars indicate higher modal abundance than thin bars and dashed bars indicate uncertain temporal relationships relative to other minerals.
Journal Article
Published: 01 February 1989
American Mineralogist (1989) 74 (1-2): 113–131.
...Marta J. K. Flohr; Malcolm Ross Abstract Ijolite xenoliths occur in gamet-pseudoleucite syenite that forms part of the outer ring of the Magnet Cove alkaline ring-dike complex. Xenoliths were collected from the Diamond Jo quarry located in the southern part of the complex. The xenoliths contain...
Journal Article
Published: 01 April 2013
Russ. Geol. Geophys. (2013) 54 (4): 416–435.
...N.V. Vladykin Abstract Earlier, a belt of alkali-granite plutons and a carbonatite province were discovered in the South Gobi Desert, Mongolia. The Lugingol pluton of pseudoleucitic syenites with carbonatites was assigned to the alkali-granite belt. However, new dating showed that it is 40 Myr...
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Journal Article
Journal: Economic Geology
Published: 01 May 1995
Economic Geology (1995) 90 (3): 520–529.
..., Be) and fluorine. Rare metal mineralization in both groups is closely related to igneous rocks of a relatively narrow compositional range including peralkaline granites, lithium-fluorine granites, leucogranites, nepheline and pseudoleucite syenites, and corresponding volcanic rocks. Four metallogenic epochs...
Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2409(19)
... (HFSE). The granitic-granodioritic rocks have compositions typical of high-K calc-alkaline and high-K shoshonitic series, whereas the monzonitic rocks display compositions characteristic of shoshonitic series. The syenite supersuite consists of quartz syenite, syenite, and nepheline- and pseudoleucite...
Journal Article
Published: 01 February 2018
Mineralogical Magazine (2018) 82 (1): 35–58.
..., calcite, chlorite, quartz and cryptocrystalline SiO 2 . On the basis of their respective mineralogy: the VL4 and VL5 dykes are classified as pseudoleucite-phlogopite lamproite; VL2 and VL3 dykes as pseudoleucite-amphibole-lamproite; and VL6, VL7 and VL8 as pseudoleucite-phlogopite-amphibole-lamproite...
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Image
(a) Hand specimen with large white spots of <b>pseudoleucite</b> in a garnet-beari...
Published: 24 November 2020
Fig. 3. (a) Hand specimen with large white spots of pseudoleucite in a garnet-bearing pseudoleucite syenite. (b) Detail of a thin section from garnet-bearing pseudoleucite showing color and structural variability in a pseudoleucite from core to rim, including the transition zone between
Journal Article
Published: 01 December 1967
American Mineralogist (1967) 52 (11-12): 1904–1910.
...R. N. Sukheswala; S. F. Sethna Abstract Pseudoleucite occurs in a tinguaite dyke near the village of Ghori (Long. 74°2′ E., Lat. 22°9′ N., Survey of India toposheet No. 46 F/12, 16), about 8 miles east of Phenai Mata, south of Chhota Udaipur. The pseudoleucite-bearing tinguaite is one of many dykes...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1941
GSA Bulletin (1941) 52 (11): 1753–1808.
...B. F. BUIE Abstract The dikes were classified under five field types, which in the order of their intrusion are: (1) amphibole phonolite, (2) pseudoleucite mafic phonolite, (3) augite mafic phonolite, (4) biotite phonolite, and (5) syenite porphyry. The rare amphibole phonolite dikes appear...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1941
GSA Bulletin (1941) 52 (11): 1809–1828.
...C. H. BURGESS Abstract The largest of the stocks of the Highwood Mountains is about 3 miles long. Most of the stocks are made up of shonkinite and mafic syenite. The stock of East Peak is a mafic pseudoleucite-augite syenite. Small bodies of leucite-rich rocks—missourite and niligongite—are present...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1941
GSA Bulletin (1941) 52 (12_1): 1857–1868.
...E. S. LARSEN; C. S. HURLBUT, JR.; C. H. BURGESS; B. F. BUIE Abstract In the shonkinite series olivine, leucite, and analcime crystallized only from magmas with over 20 per cent of mafites. At this stage the leucite and analcime inverted to pseudoleucite. Pyroxene crystallized over the whole range...
Journal Article
Journal: GSA Bulletin
Published: 01 December 1941
GSA Bulletin (1941) 52 (12_1): 1841–1856.
... rocks. Augite is an abundant mineral of the alkalic rocks; in the syenites it contains some acmite, especially on the borders of the crystals. Aegirite is a common metamorphic mineral. The olivine of the shonkinites contains from 12 to 22 mol per cent of fayalite, that of the syenite from Square Butte...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1943
GSA Bulletin (1943) 54 (11): 1693–1712.
... to chlorite, and a little pyrite and carbonate have been introduced. Other alteration products are a little ilmenite, epidote, and leucoxene. A few granular aggregates may be pseudoleucite. The xenoliths have been derived from pegmatite, mica schist or gneiss, limestone (now much silicated), amphibolite...
Journal Article
Published: 01 June 2009
Mineralogical Magazine (2009) 73 (3): 457–477.
...) peralkaline pseudoleucite-phlogopite-amphi-bole-K-feldspar lamproite (var. Damodar). Compositional and paragenetic data are provided for major, accessory and trace minerals. Minerals common to both rocks include: chlorite-pseudomorphed phenocrystal olivine, phenocrystal Ti-rich Al-poor phlogopite...
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Journal Article
Journal: Economic Geology
Published: 01 June 2014
Economic Geology (2014) 109 (4): 939–977.
... Columbia—one of the youngest known alkalic porphyry deposits within the Triassic-Jurassic Quesnel arc. The deposit is hosted by the Early Jurassic Duckling Creek Syenite Complex, an alkalic multiphase intrusive dike complex of pyroxenite, syenite, and monzonite composition. The southern part of the complex...
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Journal Article
Journal: Economic Geology
Published: 01 June 2014
Economic Geology (2014) 109 (4): 979–1004.
... of 206 Pb/ 238 U dates Syenite 07AB G5 Lower Main zone Phase 2 347365 6200895 Zircon 177.3 ± 0.4 Based on two-point weighted average of 206 Pb/ 238 U dates Pseudoleucite-bearing feldspathic pyroxenite 07AB G1 Lower Main zone Phase 2 347225 6200775 Zircon 178.4 ± 0.3 Based on one...
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Journal Article
Published: 01 June 2001
Clays and Clay Minerals (2001) 49 (3): 216–226.
.... Nordstrandite occurs near the city of Lages only in the weathered bedrock facies, mostly where the circulation of meteoric water is restricted. There is also a close association between nordstrandite and the weathering of modified pseudoleucite structures. The interaction of meteoric water and feldspathic...
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Journal Article
Journal: Economic Geology
Published: 01 June 2014
Economic Geology (2014) 109 (4): 915–938.
... Group supracrustal rocks between 210 ± 1 and 200.1 ± 2.2 Ma ( Mortensen et al., 1995 ). Syenite, monzonite, and monzodiorite dikes and stocks intruded supracrustal rocks of shoshonitic affinity consisting of augite-phyric intermediate volcanic rocks, pseudoleucite-bearing phonolites, and associated...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2010
DOI: 10.1144/SP335.18
EISBN: 9781862395831
... silica-undersaturated plutonic complex in Britain and is composed of a variety of rocks including ultramafic (‘cromaltite’ with biotite melanite pyroxenites) to mafic nepheline syenites (‘ledmorites’ with melanite, augite, nepheline and sodalite) and pseudoleucite – orthoclase bearing ‘borolanites...
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