GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

Izbrodin, I. А.; Doroshkevich, А. G.; Malyutina, А. V.; Semenova, D. V.; Radomskaya, Т. А.; Kruk, М. N.; Prokopyev, I. R.; Starikova, А. Е.; Rampilov, М. О.

doi:10.5800/gt-2024-15-1-0741

Geodin. tektonofiz.

2024

DOI: 10.5800/gt-2024-15-1-0741

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GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

I. А. Izbrodin,

А. G. Doroshkevich,

А. V. Malyutina

et al.

Abstract: Geochronological studies have been made on the main types of rocks from the Burpala alkaline massif and two gabbro and gabbro-diorite dikes located nearby. U-Pb LA-SF-ICP-MS zircon geochronology for the Burpala massif yielded a date of 294±2 Ma for gabbro crystallization, 607±4 Ma for diorite crystallization, 298±2 and 296±2 Ma for melanocratic alkaline and nepheline syenite crustallization, 291±2 and 293±3 for quartz and quartz-containing syenite crystallization, and 293±3 Ma for alkaline granite crystallizat… Show more

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Cited by 2 publications

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COMPOSITION OF MAFIC ROCK-FORMING MINERALS IN THE ROCKS OF THE BURPALA ALKALINE MASSIF (Northern Baikal area)

Malyutina,

Doroshkevich,

Starikova

et al. 2024

Russian Geology and Geophysics

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Petrographic and mineralogical studies have been carried out for major varieties of rocks composing the Burpalа massif: peralkaline (nepheline), alkali, and quartz syenites. The emphasis was put on the major and trace element composition of mafic minerals present in all types of rocks: clinopyroxenes, micas, and amphiboles. The studies have shown that the compositions of mafic minerals fractionate within each group of rocks but do not form a single trend of evolution in the groups of peralkaline, alkali, and quartz syenites. This suggests the formation of the massif under pulsed intrusion of variably differentiated magma, the contamination of the first portion of magma, and the subsequent formation of quartz syenites.

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COMPOSITION OF MAFIC ROCK-FORMING MINERALS IN THE ROCKS OF THE BURPALA ALKALINE MASSIF (Northern Baikal area)

Malyutina,

Doroshkevich,

Starikova

et al. 2024

Russian Geology and Geophysics

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Mineralogical, Petrographic and Geochemical Evidence for Zircon Formation Conditions Within the Burpala Massif, Northern Baikal Region

Starikova,

Malyutina,

Izbrodin

et al. 2024

Geodin. tektonofiz.

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This paper reports investigation on zircons from quartz syenite, alkaline and foid syenite, as well as metasomatic rock from the fenitization zone hosted by the Burpala massif. It is performed by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS), cathodoluminescence (CL), laser ablation inductively coupled plasma mass spectrometry (LA ICP MS), and Raman spectroscopy. Generally, all zircons from igneous rocks show rhythmic, crystal growth zoning or sector zoning (type I) except for some zircons from alkaline syenites (type II) showing patchy zoning. They systematically contain pores or cavities. The REE patterns of magmatic zircons share similar features: e.g. depletion of LREE ((Yb/La)N up to 35000), large positive Ce (Ce/Ce* 6–427) and small negative Eu (Eu/Eu* 0.37–0.93) anomalies. Zircons crystallized from quartz syenites at 830±30 °C at the early stage of rock formation, while zircons from alkaline and foid syenites crystallized at the later stage of rock formation (680–750 °C). Meanwhile, crystallization of zircons with rhythmic zoning (type I) occurs at later magmatic stage, while the formation zircons of type II is probably related to the separation of the highly fluorinated aqueous fluid from the residual melt.Zircons from fenites have a bipyramidal habit holding a heterogeneous mosaic core and a homogeneous (or rhythmic zoning) rim. The cores of zircon show flat REE patterns without significant anomalies, while the rims are characterized by noticeable fractionation of REE ((Yb/La)N 85–615) and show a positive Ce anomaly (Ce/Ce* 4–18). The Raman spectra of the cores show a higher degree of crystallinity than the rims, and their flat REE spectra are probably related to the contamination by micro inclusions. The discordant U-Pb age of 295±3 Ma was obtained for zircon rims, which is consistent with the age of formation of igneous rocks of the Burpala massif (298–291 Ma). The latter supports the syngenetic origin of metasomatic ore mineralization with the main stage of massif formation.

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GEOCHRONOLOGY OF ALKALINE ROCKS FROM THE BURPALA MASSIF (NORTHERN PRIBAIKALYE): NEW U-Pb DATA

Cited by 2 publications

References 27 publications

COMPOSITION OF MAFIC ROCK-FORMING MINERALS IN THE ROCKS OF THE BURPALA ALKALINE MASSIF (Northern Baikal area)

COMPOSITION OF MAFIC ROCK-FORMING MINERALS IN THE ROCKS OF THE BURPALA ALKALINE MASSIF (Northern Baikal area)

Mineralogical, Petrographic and Geochemical Evidence for Zircon Formation Conditions Within the Burpala Massif, Northern Baikal Region

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