Research output: Contribution to journal › Article › peer-review
Caledonian formation of gold-bearing sulfide depositions in Early Proterozoic gabbroids in the northern Ladoga region. / Baltybaev, Sh K.; Ovchinnikova, G. V.; Glebovitskii, V. A.; Alekseev, I. A.; Vasil’eva, I. M.; Risvanova, N. G.
In: Doklady Earth Sciences, Vol. 476, No. 1, 01.09.2017, p. 992-996.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Caledonian formation of gold-bearing sulfide depositions in Early Proterozoic gabbroids in the northern Ladoga region
AU - Baltybaev, Sh K.
AU - Ovchinnikova, G. V.
AU - Glebovitskii, V. A.
AU - Alekseev, I. A.
AU - Vasil’eva, I. M.
AU - Risvanova, N. G.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - We have studied Pb isotopic systems of K-feldspar, pyrite, and pyrrhotine from gabbroids and ore of the Velimyaki Early Proterozoic massif in the northern Ladoga region in the southeastern part of the Fennoscandian Shield. The isochronous Pb–Pb age of sulfides has been determined as ∼450 Ma, which corresponds to intersection of the regression line with the lead accumulation curve with μ = 10.4–10.8; the model Pb age of sulfides is close to isochronous under the condition that the composition of lead evolved from a geochemical reservoir with an age of 1.9 Ga. The isotopic parameters of the lead in sulfides and K-feldspar indicate their formation in upper crust conditions (μ = 238U/204Pb > 10). From the obtained data, it follows that the isotopic composition of lead in K-feldspar corresponds to a Proterozoic age (1890 Ma) of magmatic crystallization of the rocks in the massif, and strongly radiogenic lead sulfides testify, with the greatest probability, to the later (Caledonian) formation of sulfide ores.
AB - We have studied Pb isotopic systems of K-feldspar, pyrite, and pyrrhotine from gabbroids and ore of the Velimyaki Early Proterozoic massif in the northern Ladoga region in the southeastern part of the Fennoscandian Shield. The isochronous Pb–Pb age of sulfides has been determined as ∼450 Ma, which corresponds to intersection of the regression line with the lead accumulation curve with μ = 10.4–10.8; the model Pb age of sulfides is close to isochronous under the condition that the composition of lead evolved from a geochemical reservoir with an age of 1.9 Ga. The isotopic parameters of the lead in sulfides and K-feldspar indicate their formation in upper crust conditions (μ = 238U/204Pb > 10). From the obtained data, it follows that the isotopic composition of lead in K-feldspar corresponds to a Proterozoic age (1890 Ma) of magmatic crystallization of the rocks in the massif, and strongly radiogenic lead sulfides testify, with the greatest probability, to the later (Caledonian) formation of sulfide ores.
UR - http://www.scopus.com/inward/record.url?scp=85030677154&partnerID=8YFLogxK
U2 - 10.1134/S1028334X17090112
DO - 10.1134/S1028334X17090112
M3 - Article
AN - SCOPUS:85030677154
VL - 476
SP - 992
EP - 996
JO - Doklady Earth Sciences
JF - Doklady Earth Sciences
SN - 1028-334X
IS - 1
ER -
ID: 48490460