Dike rocks in the khibina Massif

Relations with the plutonic series, age, and characteristics of the mantle source

L. A.A. Arzamastsev, B. V. Belyatsky, A. V. Travin, L. V. Arzamastseva, S. E. Tsarev

Research outputpeer-review

8 Citations (Scopus)

Abstract

Isotopic-geochemical data on dikes and diatremes that intrude the Khybina Massif and its host rocks are reported. The dike rocks are subdivided into three series: alkaline-ultramafic (alkaline picrites and olivine melanephelinites), phonolite (phonolites and tinguaites), and alkaline gabbroid (essexites and theralites). The alkaline gabbroids are demonstrated to affiliate with a regionally spread series of Paleozoic dolerites, whose composition was modified via the assimilation of an alkaline-ultramafic melt by a basaltic magma. The Ar-Ar, Rb-Sr, and Sm-Nd isotopic ages of the dike rocks indicate that magmatic activity terminated in the Khibina caldera at approximately 362 Ma. Thus, the Khibina Massif was formed over the time span of 410-362 Ma, starting with the development of a collapse caldera, the first manifestations of volcanic activity in it, and ending with the origin of a dike complex. Sr-Nd isotopic data on the dike and plutonic rocks of the Khibina Massif show variations corresponding to a trend (common to the whole Kola province), characterized by an increase in the proportion of enriched mantle source in the products of the early, main, and final stages of alkaline magmatism, perhaps, because of the progressively increased addition of plume material enriched in incompatible elements to the depleted Precambrian mantle that underwent partial melting.

Original languageEnglish
Pages (from-to)267-288
Number of pages22
JournalPetrology
Volume13
Issue number3
Publication statusPublished - 1 May 2005
Externally publishedYes

Scopus subject areas

  • Geochemistry and Petrology

Cite this

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title = "Dike rocks in the khibina Massif: Relations with the plutonic series, age, and characteristics of the mantle source",
abstract = "Isotopic-geochemical data on dikes and diatremes that intrude the Khybina Massif and its host rocks are reported. The dike rocks are subdivided into three series: alkaline-ultramafic (alkaline picrites and olivine melanephelinites), phonolite (phonolites and tinguaites), and alkaline gabbroid (essexites and theralites). The alkaline gabbroids are demonstrated to affiliate with a regionally spread series of Paleozoic dolerites, whose composition was modified via the assimilation of an alkaline-ultramafic melt by a basaltic magma. The Ar-Ar, Rb-Sr, and Sm-Nd isotopic ages of the dike rocks indicate that magmatic activity terminated in the Khibina caldera at approximately 362 Ma. Thus, the Khibina Massif was formed over the time span of 410-362 Ma, starting with the development of a collapse caldera, the first manifestations of volcanic activity in it, and ending with the origin of a dike complex. Sr-Nd isotopic data on the dike and plutonic rocks of the Khibina Massif show variations corresponding to a trend (common to the whole Kola province), characterized by an increase in the proportion of enriched mantle source in the products of the early, main, and final stages of alkaline magmatism, perhaps, because of the progressively increased addition of plume material enriched in incompatible elements to the depleted Precambrian mantle that underwent partial melting.",
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Dike rocks in the khibina Massif : Relations with the plutonic series, age, and characteristics of the mantle source. / Arzamastsev, L. A.A.; Belyatsky, B. V.; Travin, A. V.; Arzamastseva, L. V.; Tsarev, S. E.

In: Petrology, Vol. 13, No. 3, 01.05.2005, p. 267-288.

Research outputpeer-review

TY - JOUR

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T2 - Relations with the plutonic series, age, and characteristics of the mantle source

AU - Arzamastsev, L. A.A.

AU - Belyatsky, B. V.

AU - Travin, A. V.

AU - Arzamastseva, L. V.

AU - Tsarev, S. E.

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