The age of camptonite dikes of the Agardag alkali-basalt complex (western Sangilen): Results of Ar/Ar and U/Pb dating

A. A. Gibsher, V. G. Malkovets, A. V. Travin, E. A. Belousova, V. V. Sharygin, Z. Konc

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A camptonite dike swarm (Agardag alkali-basalt complex) in the western part of the Sangilen Upland abounds in mantle xenoliths. Mineralogical, petrographic, and petrochemical studies show that the dikes are composed of lamprophyres of two groups, basic and ultrabasic. Ar/Ar dating of amphibole and phlogopite megacrysts gives an intrusion age for the dikes of 443.0 ± 1.3 Ma. 206Pb/ 238U dating of zircon from a glomeroporphyritic intergrowth in camptonite from one of the dikes yielded a core age of 489.0 ± 5.4 Ma. This corresponds to the time of formation of the Chzhargalanta granite-leucogranite complex (489.4 ± 2.6 Ma). The 206Pb/ 238U age of the zircon rim is 444.0 ± 7.5 Ma. The ages obtained by Ar/Ar dating of amphibole and biotite megacrysts and by U/Pb dating of the magmatic rim of zircon crystal from the camptonite coincide within the dating error, which indicates that the camptonite dikes formed in the Late Ordovician. These dikes are the oldest-known example of mantle-derived xenoliths in mafic volcanic rocks from an off-craton setting. These are samples of the Upper Ordovician lithospheric mantle.

Original languageEnglish
Pages (from-to)763-775
Number of pages13
JournalRussian Geology and Geophysics
Volume53
Issue number8
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Fingerprint

rock intrusions
alkali basalt
dating
basalt
dike
alkalies
zircon
Earth mantle
mantle
amphiboles
amphibole
Ordovician
rims
leucogranite
dike swarm
phlogopite
mafic rock
cratons
biotite
granite

Keywords

  • Ar/Ar dating
  • Camptonite
  • Sangilen
  • Tuva
  • U/Pb dating

ASJC Scopus subject areas

  • Geology
  • Geophysics

Cite this

The age of camptonite dikes of the Agardag alkali-basalt complex (western Sangilen) : Results of Ar/Ar and U/Pb dating. / Gibsher, A. A.; Malkovets, V. G.; Travin, A. V.; Belousova, E. A.; Sharygin, V. V.; Konc, Z.

In: Russian Geology and Geophysics, Vol. 53, No. 8, 08.2012, p. 763-775.

Research output: Contribution to journalArticle

Gibsher, A. A. ; Malkovets, V. G. ; Travin, A. V. ; Belousova, E. A. ; Sharygin, V. V. ; Konc, Z. / The age of camptonite dikes of the Agardag alkali-basalt complex (western Sangilen) : Results of Ar/Ar and U/Pb dating. In: Russian Geology and Geophysics. 2012 ; Vol. 53, No. 8. pp. 763-775.
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