Results 21 to 30 of about 273,837 (164)

Rubidium-rich feldspars and associated minerals from the Luolamäki pegmatite, Somero, Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 1998
Rubidium feldspar occurs near the core zone of the highly fractionated petalite-subtype Luolamäki granitic pegmatite in intimate intergrowth with other feldspars which are part of a characteristic sequence of alteration of pollucite.
D.K. Teertstra   +2 more
doaj   +1 more source

Near vein metasomatism along propylitic veins in the Baksa Gneiss Complex, Pannonian Basin, Hungary

open access: yesGeologia Croatica, 2010
In many parts of the metapelitic (gneiss, mica schist) rock section of the Baksa Complex, significant wall-rock alteration is observable along the Ca-Al silicate veins, which show a di → ep ± czo →sp → ab ± kfs → chl → adu → prh → py → cal mineral ...
Krisztian Fintor   +2 more
doaj   +1 more source

Geology of the Pitchblende Deposits of Port Radium, Great Bear Lake, N.W.T. [PDF]

open access: yes, 1955
The geology of the McTavish Arm area of Great Bear Lake, Northwest Territories, Canada, is reviewed and a geologic map is presented. The geology of the Labine Point region is described in detail.
Campbell, Douglas Dean
core   +1 more source

Mafic alkaline metasomatism in the lithosphere underneath East Serbia: evidence from the study of xenoliths and the host alkali basalts [PDF]

open access: yes, 2010
Effects of mafic alkaline metasomatism have been investigated by a combined study of the East Serbian mantle xenoliths and their host alkaline rocks.
H. Downes   +9 more
core   +1 more source

Mineralogy and Genesis of Joveinan Iron Skarn (Cenozoic Magmatic Arc, North of Isfahan) [PDF]

open access: yesپترولوژی, 2017
Joveinan marbles and skarns are located 5 km NE of Ghohrood and 140 km NW ofIsfahan in the *central part of Urumieh- Dokhtar magmatic arc. Intrusion of Ghohroodgranitoid into the Cretaceous carbonate rocks caused the contact metamorphism andformation of ...
Shahzad Sherafat   +1 more
doaj   +1 more source

Electron Microprobe Analysis of Biotite with Reequilibration Texture in Altered Trachyte

open access: yesYankuang ceshi, 2019
BACKGROUND The chemical composition of biotite contains important genetic information. The in-situ analyses of biotite with metasomatic texture can reflect the migration of the elements during the metasomatic alteration, and provide mineralogical ...
NIE Xiao   +4 more
doaj   +1 more source

Mapping Listvenite Occurrences in the Damage Zones of Northern Victoria Land, Antarctica Using ASTER Satellite Remote Sensing Data

open access: yesRemote Sensing, 2019
Listvenites normally form during hydrothermal/metasomatic alteration of mafic and ultramafic rocks and represent a key indicator for the occurrence of ore mineralizations in orogenic systems.
Amin Beiranvand Pour   +10 more
doaj   +1 more source

Metasomatic alteration associated with the formation of subvolcanic rocks of the Abagatuysky complex (Nerchinsk ore region, Eastern Transbaikalia) [PDF]

open access: yes, 2019
Within the northeastern edge of the Borschovochny pluton, located in Eastern Transbaikalia, a complex of small intrusions is localized, represented by the subvolcanic bodies of the Early Cretaceous Abagatuysky andesite-dacite complex.
Kremer, Ivan O., Tishin, Platon A.
core   +1 more source

Hydrothermal speleogenesis in carbonates and metasomatic silicites induced by subvolcanic intrusions: a case study from the Štiavnické vrchy Mountains, Slovakia

open access: yesInternational Journal of Speleology, 2016
Several caves of hydrothermal origin in crystalline limestones and metasomatic silicites were investigated in the central zone of the Štiavnica stratovolcano, Štiavnické vrchy Mountains, central Slovakia.
Pavel Bella   +4 more
doaj   +1 more source

PRECIOUS-METAL MINERALIZATION AT THE WESTERN EXOCONTACT OF THE HAUTAVAARA MASSIF, SOUTH KARELIA

open access: yesTransactions of the Karelian Research Centre of the Russian Academy of Sciences, 2017
Intense silicification zones and metasomatic alterations (propylitic-type) with Au-Bi-Tebearing base-metal and sulfoarsenide mineralization were revealed at the exocontact of the Hautavaara granosyenite-monzogranite massif, South Karelia.
Людмила Владимировна Кулешевич   +7 more
doaj   +1 more source

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