Rare gas isotopes and parent trace elements in ultrabasic-alkaline-carbonatite complexes, Kola Peninsula: identification of lower mantle plume component

Tolstikhin, Igor; Kamensky, I. L.; Marty, B.; Nivin, V. A.; Vetrin, V. R.; Balaganskaya, Elena; Ikorsky, S. V.; Gannibal, M. A.; Weiss, Dominik; Verhulst, Anne; Demaiffe, Daniel

doi:10.1016/s0016-7037(01)00807-9

Cited by 76 publications

(37 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Rock (1991) also pointed out that there is a compositional continuum between these magma types. The noble gas systematics (Tolstikhin et al, 2002) suggest an origin related to mantle plume activity.…”

Section: Discussion 51 General Considerationsmentioning

confidence: 98%

“…The highly silica-undersaturated nature of the magmatism is, however, rather unusual for a plume event and tends to suggest very small degrees of melting of an enriched source, rather than extensive melting related to the impact of a large plume head. Even the He isotopic systematics suggests only a limited role for material actually derived from the lower mantle (Tolstikhin et al, 1999(Tolstikhin et al, , 2002. Moreover, Meiboom et al (2003) He ratios) may not be a reliable indicator of the presence of a deep «plume» component.…”

Section: Asthenospheric or Lithospheric Source?mentioning

confidence: 99%

“…More than 300 rocks and minerals from the KACP have been studied for noble gas concentrations (He, Ne and Ar) and isotope systematics (Tolstikhin & Marty, 1998;Tolstikhin et al, 1999Tolstikhin et al, , 2002 He ratio of 3.3x10 4 , were measured in a magnetite separate from a Seblyavr clinopyroxenite (Kamensky et al, 2000). From the noble gas compositions, Tolstikhin et al (2002) considered that the KACP magmatism was related to a lower mantle plume with an initial 4 He/ 3 He of 3 x 10 4 .…”

Section: Noble Gas Studiesmentioning

confidence: 99%

“…From the noble gas compositions, Tolstikhin et al (2002) considered that the KACP magmatism was related to a lower mantle plume with an initial 4 He/ 3 He of 3 x 10 4 . On the basis of the noble gas abundances in the principal terrestrial reservoirs (Tolstikhin & Marty, 1998), the contribution of the lower mantle in KACP parental melts was estimated to be 1.8 wt.%.…”

Section: Noble Gas Studiesmentioning

confidence: 99%

“…On the basis of the noble gas abundances in the principal terrestrial reservoirs (Tolstikhin & Marty, 1998), the contribution of the lower mantle in KACP parental melts was estimated to be 1.8 wt.%. This implies that heat from the plume caused melting of the upper mantle, possibly including metasomatised subcontinental lithosphere (Tolstikhin et al, 1999(Tolstikhin et al, , 2002). Kukharenko et al (1965) and Galakhov (1975) first suggested a mantle origin for the parental melts within the KACP from petrologic and geochemical data.…”

Section: Noble Gas Studiesmentioning

confidence: 99%

See 4 more Smart Citations

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: A review

Downes

Balaganskaya

Beard

et al. 2005

Lithos

169

View full text Add to dashboard Cite

Igneous rocks of the Devonian Kola Alkaline Carbonatite Province (KACP) in NW Russia and eastern Finland can be classified into four groups: (a) primitive mantle-derived silicaundersaturated silicate magmas; (b) evolved alkaline and nepheline syenites; (c) cumulate rocks; (d) carbonatites and phoscorites, some of which may also be cumulates. There is no obvious age difference between these various groups, so all of the magma-types were formed at the same time in a relatively restricted area and must therefore be petrogenetically related. Both sodic and potassic varieties of primitive silicate magmas are present. On major element variation diagrams, the cumulate rocks plot as simple mixtures of their constituent minerals (olivine, clinopyroxene, calcite etc). There are complete compositional trends between carbonatites, phoscorites and silicate cumulates, which suggests that many carbonatites and phoscorites are also cumulates. CaO/Al 2 O 3 ratios for ultramafic and mafic silicate rocks in dykes and pipes range up to 5, indicating a very small degree of melting of a carbonated mantle at depth. Damkjernites appear to be transitional to carbonatites. Trace element modelling indicates that all the mafic silicate magmas are related to small degrees of melting of a metasomatised garnet peridotite source. Similarities of the REE patterns and initial Sr and Nd isotope compositions for ultramafic alkaline silicate rocks and carbonatites indicate that there is a strong relationship between the two magma-types. There is also a strong petrogenetic link between carbonatites, kimberlites and alkaline ultramafic lamprophyres. Fractional crystallisation of olivine, diopside, melilite and nepheline gave rise to the evolved nepheline syenites, and formed the ultramafic cumulates. All magmas in the KACP appear to have originated in a single event, possibly triggered by the arrival of hot material (mantle plume?) beneath the Archaean/Proterozoic lithosphere of the northern Baltic Shield that had been recently metasomatised. Melting of the carbonated garnet peridotite mantle formed a spectrum of magmas including carbonatite, damkjernite, melilitite, melanephelinite and ultramafic lamprophyre. Pockets of phlogopite metasomatised lithospheric mantle also melted to form potassic magmas including kimberlite. Depth of melting, degree of melting and presence of metasomatic phases are probably the major factors controlling the precise composition of the primary melts formed.

show abstract

Section: Discussion 51 General Considerationsmentioning

confidence: 98%

Section: Asthenospheric or Lithospheric Source?mentioning

confidence: 99%

Section: Noble Gas Studiesmentioning

confidence: 99%

Section: Noble Gas Studiesmentioning

confidence: 99%

Section: Noble Gas Studiesmentioning

confidence: 99%

See 3 more Smart Citations

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: A review

Downes

Balaganskaya

Beard

et al. 2005

Lithos

169

View full text Add to dashboard Cite

show abstract

An isotope ratio mass spectrometry‐based method for hydrogen isotopic analysis in sub‐microliter volumes of water: Application for multi‐isotope investigations of gases extracted from fluid inclusions

Buikin

Кузнецова

Velivetskaya

et al. 2020

Rapid Comm Mass Spectrometry

View full text Add to dashboard Cite

The study of multi-isotope systematics of fluid inclusions is of great importance for understanding of the sources and evolution of fluid phases in mantle rocks and ore deposits. The most appropriate technique for such investigations is a (stepwise) crushing method that is widely used for noble gases and nitrogen. However, because of the possible influence of mechanochemical reactions and back sorption, analyses of the isotope composition of water extracted by crushing from fluid inclusions are challenging. Methods: An isotope ratio mass spectrometry (IRMS)-based method for hydrogen (and oxygen) isotopic analysis in sub-microliter volumes of water extracted from fluid inclusions by crushing is presented. The verification of the possible influence of adsorption processes and mechanochemical reactions on the results of isotope analysis was performed for the first time. For that a series of parallel analyses of hydrogen isotopic ratios from water inclusions in quartz applying physically different extraction methods (crushing and thermodecrepitation) was conducted. Results: Four series of quartz aliquots were analyzed: three series extracting water by crushing (two series for δ 2 H values and one for δ 18 O values) and one by thermodecrepitation. The mean value for the crushing results is δ 2 H = −85.3 ± 3.6 ‰ (1σ, n = 11), which coincides well with the thermodecrepitation data (−86.3 ± 2.0 ‰, 1σ, n = 5), suggesting that our methodological approach allows the influence of back sorption or mechanochemical reactions during the crushing experiment to be minimized. The reproducibility of the oxygen isotopic ratios is ±0.9 ‰ (1σ, n = 5). Conclusions: The conducted experiments have shown that the influence of back sorption or mechanochemical reactions during crushing on isotopic results is not crucial for our method. The developed IRMS-based method for hydrogen (and oxygen) isotopic analysis in sub-microliter volumes of water is well applicable for multi-isotope investigations of gases extracted from fluid inclusions. As an

show abstract

Abiotic Methane on Earth

Etiope

Lollar

2013

Reviews of Geophysics

484

437

View full text Add to dashboard Cite

[1] Over the last 30 years, geochemical research has demonstrated that abiotic methane (CH 4 ), formed by chemical reactions which do not directly involve organic matter, occurs on Earth in several specific geologic environments. It can be produced by either high-temperature magmatic processes in volcanic and geothermal areas, or via low-temperature (<100 C) gas-water-rock reactions in continental settings, even at shallow depths. The isotopic composition of C and H is a first step in distinguishing abiotic from biotic (including either microbial or thermogenic) CH 4 . Herein we demonstrate that integrated geochemical diagnostic techniques, based on molecular composition of associated gases, noble gas isotopes, mixing models, and a detailed knowledge of the geologic and hydrogeologic context are necessary to confirm the occurrence of abiotic CH 4 in natural gases, which are frequently mixtures of multiple sources. Although it has been traditionally assumed that abiotic CH 4 is mainly related to mantle-derived or magmatic processes, a new generation of data is showing that low-temperature synthesis related to gas-water-rock reactions is more common than previously thought. This paper reviews the major sources of abiotic CH 4 and the primary approaches for differentiating abiotic from biotic CH 4, including novel potential tools such as clumped isotope geochemistry. A diagnostic approach for differentiation is proposed.

show abstract

Rare gas isotopes and parent trace elements in ultrabasic-alkaline-carbonatite complexes, Kola Peninsula: identification of lower mantle plume component

Cited by 76 publications

References 62 publications

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: A review

Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: A review

An isotope ratio mass spectrometry‐based method for hydrogen isotopic analysis in sub‐microliter volumes of water: Application for multi‐isotope investigations of gases extracted from fluid inclusions

Abiotic Methane on Earth

Contact Info

Product

Resources

About