Differing responses of zircon, chevkinite-(Ce), monazite-(Ce) and fergusonite-(Y) to hydrothermal alteration: Evidence from the Keivy alkaline province, Kola Peninsula, Russia

Macdonald, Ray; Bagiński, Bogusław; Zozulya, Dmitry

doi:10.1007/s00710-017-0506-2

Cited by 15 publications

(7 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The predominant accumulation of Th in the ores indicates a high alkali content and the significant prevalence of F over CO 2 in the ore-forming fluid [53]. Similar Th behavior with respect to U has been noted for many magmatogenic REE deposits that were subjected to intense reworking by hydrothermal alkaline-fluorine fluids [54][55][56]. It is suggested that partitioning of F into fluid is also promoted by a low Ca content in the melt.…”

Section: Ree Enrichment Processes In Keivy Alkali Granite-nepheline Smentioning

confidence: 59%

Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia

et al. 2019

Self Cite

View full text Add to dashboard Cite

The Keivy alkali granite-nepheline syenite complex, Kola Peninsula, NW Russia, contains numerous associated Zr-REE-Y-Nb occurrences and deposits, formed by a complex sequence of magmatic, late-magmatic, and post-magmatic (including pegmatitic, hydrothermal, and metasomatic) processes. The REE-rich lithologies have abundant (some of economic importance) and diverse britholite group minerals. The REE and actinides distribution in host rocks indicates that the emanating fluids were alkaline, with significant amounts of F and CO2. From chemical studies (REE and F variations) of the britholites the possible fluid compositions in different lithologies are proposed. Fluorbritholite-(Y) and britholite-(Y) from products of alkali granite (mineralized granite, pegmatite, quartzolite) formed under relatively high F activity in fluids with low CO2/H2O ratio. The highest F and moderate CO2 contents are characteristic of fluid from a mineralized nepheline syenite, resulting in crystallization of fluorbritholite-(Ce). Britholite group minerals (mainly fluorcalciobritholite and ‘calciobritholite’) from a nepheline syenite pegmatite formed from a fluid with composition changing from low F and high CO2 to moderate F and CO2. An extremely high F content is revealed for metasomatizing fluids emanating from alkali granitic magma and which affected the basic country rocks. The dominant substitution scheme for Keivy britholites is REE3+ + Si4+ = Ca2+ + P5+, showing the full range of ‘britholite’ and ‘calciobritholite’ compositions up to theoretical apatite.

show abstract

Section: Ree Enrichment Processes In Keivy Alkali Granite-nepheline Smentioning

confidence: 59%

Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Формы выделения и состав пирохлора указывают на то, что он имеет магматическое происхождение. Изученный пирохлор отличается низким содер жанием Si, U, Th, Pb, Fe, Ba, Sr, что отличает его от метасоматического пиро хлора, развитого в палеопротерозойских и палеозойских щелочных комплексах Кольской провинции, а также пирохлора, связанного с неоархейским щелочно-гранитным комплексом Кейв (Волошин и др., 1981; Сорохтина и др., 2010;Baginski et al, 2016;MacDonald et al, 2017;и др. ).…”

Section: обсуждение результатовunclassified

“…В Кольской щелочной провинции Ta-Nb оруденение установлено в силекситах и кварц-эпидотовых метасоматитах, приуроченных к Кейвским щелочным гранитам. Оно представлено фергусонитом-(Ce) и единичными зернами пирохлора (Bagiński et al, 2016;MacDonald et al, 2017). Пирохлоровое оруденение характерно лишь для щелочных массивов протерозойского и палеозойского возрастов (Волошин и др., 1981; Сорохтина и др., 2010; Афанасьев, 2011).…”

unclassified

Niz'yavrski alkaline massif: age, isotopic characteristics and rare-metal mineralization

Petrovskiy

Николаевич²

2019

Zapiski RMO

View full text Add to dashboard Cite

Низъяврский щелочной массив имеет двухфазное строение и сложен щелочными сиенитами и щелочными кварцевыми сиенитами. Возраст кристаллизации щелочных кварцевых сиенитов второй фазы равен 2656 ± 3 млн лет. По изотопно-геохимическим (Rb-Sr, Sm-Nd) характеристикам породы массива имеют мантийное происхождение. Источником их расплавов, как и для других неоархейских щелочных интрузий Кольской провинции, относящихся к формации щелочных габбро-нефелиновых сиенитов-щелочных сиенитов-граносиенитов, вероятно, являлась мантия типа BSE. В породах массива установлено Ta-Nb оруденение, представленное пирохлором, что отличает его от других неоархейских щелочных массивов провинции.

show abstract

“…In the contact zones between the alkaline granites and the metamorphic rocks, as well as in the internal part of the granitic intrusions, pegmatites and quartzolites are common. Following [20,21], the term "quartzolite" is used for a pegmatitic or hydrothermal rock that is primarily composed of quartz (> 60 vol %). The available geochronological estimates imply the possibility of the diachronous formation of pegmatites and quartzolites: The first formation stage was syngenetic to granites [16,20,22], and the second one occurred 1.6-1.7 Ga ago during the regressive stage of the Svecofennian metamorphic event [21,23].…”

Section: Introductionmentioning

confidence: 99%

“…Following [20,21], the term "quartzolite" is used for a pegmatitic or hydrothermal rock that is primarily composed of quartz (> 60 vol %). The available geochronological estimates imply the possibility of the diachronous formation of pegmatites and quartzolites: The first formation stage was syngenetic to granites [16,20,22], and the second one occurred 1.6-1.7 Ga ago during the regressive stage of the Svecofennian metamorphic event [21,23]. The formation temperature of these rocks is about 400 • C [5].…”

Section: Introductionmentioning

confidence: 99%

Carbon Sources and the Graphitization of Carbonaceous Matter in Precambrian Rocks of the Keivy Terrane (Kola Peninsula, Russia)

et al. 2019

View full text Add to dashboard Cite

The Precambrian rocks of the Keivy Terrane reveal five types of carbonaceous matter (CM): Fine-grained, flaky, nest, vein, and spherulitic. These types differ in their distribution character, carbon isotope composition, and graphitization temperatures calculated by the Raman spectra of carbonaceous material (RSCM) geothermometry. Supracrustal rocks of the Keivy Terrane contain extremely isotopically light (δ13CPDB = –43 ± 3‰) carbon. Presumably, its source was a methane–aqueous fluid. According to temperature calculations, this carbon matter and the host strata underwent at least two stages of metamorphism in the west of the Keivy Terrane and one stage in the east. The CM isotope signatures of several samples of kyanite schists (δ13CPDB = –33 ± 5‰) are close to those of oils and oil source rocks, and they indicate an additional carbon reservoir. Thus, in the Keivy territory, an oil-and-gas bearing basin has existed. Heavy carbon (δ13CPDB = −8 ± 3‰) precipitated from an aqueous CO2-rich fluid is derived from either the lower crust or the mantle. This fluid probably migrated from the Keivy alkaline granites into the surrounding rocks previously enriched with “methanogenic” carbon.

show abstract

Differing responses of zircon, chevkinite-(Ce), monazite-(Ce) and fergusonite-(Y) to hydrothermal alteration: Evidence from the Keivy alkaline province, Kola Peninsula, Russia

Cited by 15 publications

References 59 publications

Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia

Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia

Niz'yavrski alkaline massif: age, isotopic characteristics and rare-metal mineralization

Carbon Sources and the Graphitization of Carbonaceous Matter in Precambrian Rocks of the Keivy Terrane (Kola Peninsula, Russia)

Contact Info

Product

Resources

About