Lu–Hf isotopic systematics of zircon from lower crustal xenoliths in the Belomorian mobile belt

V. R. Vetrin; E. A. Belousova; A. A. Kremenetsky

doi:10.1134/S1075701518070085

Lu–Hf isotopic systematics of zircon from lower crustal xenoliths in the Belomorian mobile belt

V. R. Vetrin, E. A. Belousova, A. A. Kremenetsky

Faculty of Science and Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The structure, geochemistry, and U–Pb and Lu–Hf isotopic composition of zircon crystals from garnet granulite xenoliths of the lower crust in the Belomorian mobile belt have been studied. It has been established that Early Paleoproterozoic zircon, 2.47 Ga in age, is primary magmatic and formed during crystallization of mafic rocks in the lower crust. Meso- and Neoarchean zircons are xenogenic crystals trapped by mafic melt during its contamination with older crustal sialic rocks. Metamorphic zircon grains have yielded a Late Paleoproterozoic age (1.75 Ga). A Paleozoic age has been established for a magmatic crystal formed due to interaction of xenoliths with an alkaline ultramafic melt, which delivered xenoliths to surface. The U–Pb datings and Lu–Hf systematics of crystals have been used to delineate the stages of formation and transformation of the lower crust in this region.

Original language	English
Pages (from-to)	568-577
Number of pages	10
Journal	Geology of Ore Deposits
Volume	60
Issue number	7
DOIs	https://doi.org/10.1134/S1075701518070085
Publication status	Published - Dec 2018

Keywords

xenolith
lower crust
zircon
Lu–Hf isotopic system
consistency of Lu–Hf and Sm–Nd isotopic systems
stages of lower crust formation
Kola Peninsula

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title = "Lu–Hf isotopic systematics of zircon from lower crustal xenoliths in the Belomorian mobile belt",

abstract = "The structure, geochemistry, and U–Pb and Lu–Hf isotopic composition of zircon crystals from garnet granulite xenoliths of the lower crust in the Belomorian mobile belt have been studied. It has been established that Early Paleoproterozoic zircon, 2.47 Ga in age, is primary magmatic and formed during crystallization of mafic rocks in the lower crust. Meso- and Neoarchean zircons are xenogenic crystals trapped by mafic melt during its contamination with older crustal sialic rocks. Metamorphic zircon grains have yielded a Late Paleoproterozoic age (1.75 Ga). A Paleozoic age has been established for a magmatic crystal formed due to interaction of xenoliths with an alkaline ultramafic melt, which delivered xenoliths to surface. The U–Pb datings and Lu–Hf systematics of crystals have been used to delineate the stages of formation and transformation of the lower crust in this region.",

keywords = "xenolith, lower crust, zircon, Lu–Hf isotopic system, consistency of Lu–Hf and Sm–Nd isotopic systems, stages of lower crust formation, Kola Peninsula",

author = "Vetrin, {V. R.} and Belousova, {E. A.} and Kremenetsky, {A. A.}",

year = "2018",

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T1 - Lu–Hf isotopic systematics of zircon from lower crustal xenoliths in the Belomorian mobile belt

AU - Vetrin, V. R.

AU - Belousova, E. A.

AU - Kremenetsky, A. A.

PY - 2018/12

Y1 - 2018/12

N2 - The structure, geochemistry, and U–Pb and Lu–Hf isotopic composition of zircon crystals from garnet granulite xenoliths of the lower crust in the Belomorian mobile belt have been studied. It has been established that Early Paleoproterozoic zircon, 2.47 Ga in age, is primary magmatic and formed during crystallization of mafic rocks in the lower crust. Meso- and Neoarchean zircons are xenogenic crystals trapped by mafic melt during its contamination with older crustal sialic rocks. Metamorphic zircon grains have yielded a Late Paleoproterozoic age (1.75 Ga). A Paleozoic age has been established for a magmatic crystal formed due to interaction of xenoliths with an alkaline ultramafic melt, which delivered xenoliths to surface. The U–Pb datings and Lu–Hf systematics of crystals have been used to delineate the stages of formation and transformation of the lower crust in this region.

AB - The structure, geochemistry, and U–Pb and Lu–Hf isotopic composition of zircon crystals from garnet granulite xenoliths of the lower crust in the Belomorian mobile belt have been studied. It has been established that Early Paleoproterozoic zircon, 2.47 Ga in age, is primary magmatic and formed during crystallization of mafic rocks in the lower crust. Meso- and Neoarchean zircons are xenogenic crystals trapped by mafic melt during its contamination with older crustal sialic rocks. Metamorphic zircon grains have yielded a Late Paleoproterozoic age (1.75 Ga). A Paleozoic age has been established for a magmatic crystal formed due to interaction of xenoliths with an alkaline ultramafic melt, which delivered xenoliths to surface. The U–Pb datings and Lu–Hf systematics of crystals have been used to delineate the stages of formation and transformation of the lower crust in this region.

KW - xenolith

KW - lower crust

KW - zircon

KW - Lu–Hf isotopic system

KW - consistency of Lu–Hf and Sm–Nd isotopic systems

KW - stages of lower crust formation

KW - Kola Peninsula

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