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 language | English |
|---|---|
| Pages (from-to) | 1942-1952 |
| Number of pages | 11 |
| Journal | Economic Geology |
| Volume | 80 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1985 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Zircon dating of polycyclic volcanism at Sturgeon Lake and implications for base metal mineralization.
AU - Davis, D. W.
AU - Krogh, T. E.
AU - Hinzer, J.
AU - Nakamura, Eizou
PY - 1985
Y1 - 1985
N2 - 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
AB - 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
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UR - http://www.scopus.com/inward/citedby.url?scp=0022251073&partnerID=8YFLogxK
U2 - 10.2113/gsecongeo.80.7.1942
DO - 10.2113/gsecongeo.80.7.1942
M3 - Article
AN - SCOPUS:0022251073
VL - 80
SP - 1942
EP - 1952
JO - Economic Geology
JF - Economic Geology
SN - 0361-0128
IS - 7
ER -