Open AccessThe Kandalaksha-Kolvitsa gabbro-anorthosite complex: Nd-Sr isotope-geochronological evidence of its affinity to the East-Scandinavian Large Igneous Province
Author(s) -
Ekaterina Steshenko,
Pavel Serov,
E. L. Kunakkuzin,
Н. А. Екимова,
T. B. Bayanova
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/539/1/012160
Subject(s) - anorthosite , geology , gabbro , geochemistry , massif , igneous rock , metamorphic rock , mantle (geology) , zircon , petrology , plagioclase , paleontology , quartz
The article provides new Sm-Nd and Nd-Sr isotope-geochronological data on rocks of the Paleoproterozoic Kandalaksha-Kolvitsa gabbro-anorthosite complex. The isotope Sm-Nd dating on metamorphic minerals (apatite, garnet, sulfide) and rock of the Kolvitsa massif yielded the age of 1887±37 Ma (high-temperature metasomatic transformation) and 1692±71 Ma (regional fluid processing). The model Sm-Nd age of metagabbro is 3.3 Ga with a negative value of εNd=-5.5, which indicates processes of crustal contamination or primary enriched mantle reservoir of initial magmas. According to geochronological and Nd-Sr isotope data, rocks of the Kandalaksha-Kolvitsa complex seem to have a common anomalous mantle source with Paleoproterozoic layered intrusions in the Baltic Shield.