Zircon dating of polycyclic volcanism at Sturgeon Lake and implications for base metal mineralization.

D. W. Davis, T. E. Krogh, J. Hinzer, Eizou Nakamura

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The S Sturgeon Lake sequence consists of 4 volcanic cycles. The lower 2 cycles host Cu/Zn massive sulfide mineralization. Trace element and REE analyses indicate that the lower 3 cycles have a similar petrogenetic history and are cogenetic with the Beidelman Bay pluton, a subvolcanic trondhjemite sill which intrudes the base of the lower cycle. The upper cycle is distinctly different. U/Pb zircon analyses have been performed on 7 rocks from the lower 3 cycles in an effort to resolve the ages. All age analyses agree within error, giving an average of 2735.5Ma with a range of 1.5Ma. The uppermost cycle was previously dated at 2717.9 +2.7 -1.5Ma, 18Ma younger than the lower cycles. Moreover, REE data indicate that this upper cycle is not comagmatic with the lower cycles. The data indicate rapid evolution of a volcanic pile followed by a long period of quiescence and later reactivation from a different magmatic source. The younger age of the Beidelman Bay pluton indicates that it probably is not directly related to volcanism and ore-forming hydrothermal activity. However, it may occupy the magma chamber which previously fed rhyolitic volanism and acted as a heat source driving hydrothermal convection which transported and deposited base metals. -from Authors

Original languageEnglish
Pages (from-to)1942-1952
Number of pages11
JournalEconomic Geology
Volume80
Issue number7
DOIs
Publication statusPublished - 1985
Externally publishedYes

Fingerprint

Trace Elements
Sulfides
base metal
dating
lakes
Ores
Piles
Lakes
volcanism
zircon
Metals
Rocks
mineralization
cycles
pluton
lake
rare earth element
metals
trondhjemite
hydrothermal activity

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Zircon dating of polycyclic volcanism at Sturgeon Lake and implications for base metal mineralization. / Davis, D. W.; Krogh, T. E.; Hinzer, J.; Nakamura, Eizou.

In: Economic Geology, Vol. 80, No. 7, 1985, p. 1942-1952.

Research output: Contribution to journalArticle

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