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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Altai Mountains
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Mongolian Altai (1)
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Far East
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Mongolia
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Mongolian Altai (1)
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Irkutsk Russian Federation (2)
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Commonwealth of Independent States
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Russian Federation
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Europe
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Carpathians (1)
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Czech Republic
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Murmansk Russian Federation
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Southern Europe
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Italy
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Western Europe
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rutile (1)
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sheet silicates
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clay minerals
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smectite (1)
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vanadates (1)
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Primary terms
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Asia
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Altai Mountains
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Mongolian Altai (1)
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Far East
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Mongolia
-
Mongolian Altai (1)
-
-
-
Irkutsk Russian Federation (2)
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Transbaikalia (1)
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Western Transbaikalia (1)
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Cenozoic
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Tertiary
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Paleogene (2)
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crystal chemistry (4)
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crystal structure (4)
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Europe
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Carpathians (1)
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Central Europe
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Czech Republic
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Moravia (1)
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Murmansk Russian Federation
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Kola Peninsula (1)
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Southern Europe
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Italy
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Sicily Italy
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Pantelleria (1)
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-
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Western Europe
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United Kingdom
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Great Britain
-
Scotland
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Argyllshire Scotland
-
Mull Island (1)
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East Lothian Scotland (1)
-
Hebrides
-
Inner Hebrides
-
Isle of Skye (1)
-
Mull Island (1)
-
Rhum (1)
-
-
-
Highland region Scotland
-
Ardnamurchan (1)
-
Inverness-shire Scotland
-
Isle of Skye (1)
-
Rhum (1)
-
-
-
-
-
Northern Ireland (2)
-
-
-
-
igneous rocks
-
carbonatites (1)
-
plutonic rocks
-
granites
-
alkali granites (2)
-
biotite granite (1)
-
-
lamprophyres (1)
-
ultramafics
-
peridotites
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spinel lherzolite (1)
-
-
-
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volcanic rocks
-
basanite (1)
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pyroclastics
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ignimbrite (1)
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tuff (1)
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rhyolites (1)
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trachyandesites (1)
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lava (1)
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mantle (1)
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metal ores
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niobium ores (1)
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rare earth deposits (1)
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metals
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actinides
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thorium (1)
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alkali metals
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potassium (1)
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sodium (1)
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alkaline earth metals
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calcium (1)
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arsenic (1)
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chromium (1)
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iron
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ferrous iron (1)
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manganese (1)
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niobium (2)
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rare earths
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cerium (3)
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neodymium (1)
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yttrium (1)
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titanium (1)
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zinc (1)
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zirconium (1)
-
-
metamorphic rocks
-
metasomatic rocks (2)
-
-
metasomatism (4)
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Paleozoic
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Carboniferous
-
Namurian (1)
-
-
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paragenesis (2)
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phosphorus (1)
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Precambrian
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Archean (1)
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United States
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Utah (1)
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Experimental Synthesis of the Rare-Earth Fluoride Gagarinite-(Ce) by Fluid-Induced Alteration of Chevkinite-(Ce)
The Weaklaw Vent, SE Scotland: Metasomatism of eruptive products by carbo-hydro-fluids of probable mantle origin
The occurrence of wakefieldite, a rare earth element vanadate, in the rhyolitic Joe Lott Tuff, Utah, USA
Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): Recrystallization, transformation, and metamict states in chevkinite
Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): X-ray diffraction and photoelectron spectroscopy studies and mechanisms of Nb enrichment
Composition, paragenesis, and alteration of the chevkinite group of minerals
Tuhualite in a peralkaline rhyolitic ignimbrite from Pantelleria, Italy
Ti–Zr–Nb-bearing accessory minerals in high-K trachyandesitic rocks from the Western Outer Carpathians, Moravia, Czech Republic
Low-temperature hydrothermal alteration of a rare-metal rich quartz–epidote metasomatite from the El’ozero deposit, Kola Peninsula, Russia
Interaction of Rare-metal Minerals with Hydrothermal Fluids: Evidence from Quartz–epidote Metasomatites of the Haldzan Buragtag Massif, Mongolian Altai
Structure of Sr-Zr-bearing perrierite-(Ce) from the Burpala Massif, Russia
Apatite-supergroup minerals in UK Palaeogene granites: composition and relationship to host-rock composition
CHEVKINITE-GROUP MINERALS IN UK PALAEOGENE GRANITES: UNDERESTIMATED REE-BEARING ACCESSORY PHASES
Abstract Permian volcanic rocks from the Gorzów Wielkopolski region (NW Poland), although pervasively altered by low-grade metamorphism, still preserve the geochemical characteristics of continental mafic volcanic rocks formed by partial melting of an enriched mantle source. The metamorphic assemblage comprises corrensite, pumpellyite, laumontite, quartz and chalcedony, albite, calcite and solid bitumen (major components). Petrological studies combined with microthermometric determinations indicate a low-pressure zeolite-greenschist-facies transitional zone metamorphic grade with a clockwise (pressure-temperature) P-T path: earliest event 140–210 °C and 630–760 bar; metamorphic peak 220–300 °C and 950 bar; youngest episode: T ⩾ 130 °C and 630–760 bar. The metamorphism of the Rotliegend volcanic rocks is generally ascribed to penetration of upwelling fluids released from clastic rocks underlying the extrusive Permian unit. However, the ubiquitous occurrence of anhydrite in the altered volcanic rocks suggests an influence of pore water from the overlying Zechstein evaporite sequence. The source of metamorphic heat can be tentatively assigned to abnormal heat flow and/or exothermic reactions during magmatic mineral alteration processes. Dating of metamorphism in neighbouring areas suggests an Upper Jurassic thermal event related to the upwelling of a mantle diapir during the initiation and early evolution of the North Atlantic rift.