Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Late Triassic (Carnian) lamproites from Noril'sk, polar Siberia : Evidence for melting of the recycled Archean crust and the question of lamproite source for some placer diamond deposits of the Siberian Craton. / Ivanov, Alexei V.; Demonterova, Elena I.; Savatenkov, Valery M.; Perepelov, Alexander B.; Ryabov, Viktor V.; Shevko, Artem Y.
в: Lithos, Том 296-299, 01.2018, стр. 67-78.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Late Triassic (Carnian) lamproites from Noril'sk, polar Siberia
T2 - Evidence for melting of the recycled Archean crust and the question of lamproite source for some placer diamond deposits of the Siberian Craton
AU - Ivanov, Alexei V.
AU - Demonterova, Elena I.
AU - Savatenkov, Valery M.
AU - Perepelov, Alexander B.
AU - Ryabov, Viktor V.
AU - Shevko, Artem Y.
PY - 2018/1
Y1 - 2018/1
N2 - Two typical lamproitic dykes were found in Noril'sk region of the north-western Siberian Craton, which according to mineralogical, geochemical and isotopic criteria belong to anorogenic, non-diamondiferous type of lamproites. According to the geologic relationships, they cut through the Noril'sk-1 intrusion of the Siberian flood basalt province and thus are younger than ~ 251 Ma. 40Ar/39Ar dating of the two dykes yielded ages of 235.24 ± 0.19 Ma and 233.96 ± 0.19 Ma, showing that they were emplaced in Carnian of the Late Triassic, about 16 Ma after the flood basalt event. There are some indications that there were multiple lamproitic dyke emplacements, including probably emplacement of diamondiferous lamproites, which produced Carnian-age diamond-rich placer deposits in other parts of the Siberian Craton and in adjacent regions. Lead isotope modelling shows that the source of the studied lamproites was formed with participation of recycled crust, which underwent modification of its U/Pb ratio as early as 2.5 Ga. However, the exact mechanism of the recycling cannot be deciphered now. It could be either through delamination of the cratonic crust or subduction of a mix of ancient terrigenous sediments into the mantle transition zone.
AB - Two typical lamproitic dykes were found in Noril'sk region of the north-western Siberian Craton, which according to mineralogical, geochemical and isotopic criteria belong to anorogenic, non-diamondiferous type of lamproites. According to the geologic relationships, they cut through the Noril'sk-1 intrusion of the Siberian flood basalt province and thus are younger than ~ 251 Ma. 40Ar/39Ar dating of the two dykes yielded ages of 235.24 ± 0.19 Ma and 233.96 ± 0.19 Ma, showing that they were emplaced in Carnian of the Late Triassic, about 16 Ma after the flood basalt event. There are some indications that there were multiple lamproitic dyke emplacements, including probably emplacement of diamondiferous lamproites, which produced Carnian-age diamond-rich placer deposits in other parts of the Siberian Craton and in adjacent regions. Lead isotope modelling shows that the source of the studied lamproites was formed with participation of recycled crust, which underwent modification of its U/Pb ratio as early as 2.5 Ga. However, the exact mechanism of the recycling cannot be deciphered now. It could be either through delamination of the cratonic crust or subduction of a mix of ancient terrigenous sediments into the mantle transition zone.
KW - Ar-Ar dating
KW - Carnian
KW - Geochemistry
KW - Lamproite
KW - Mineralogy
KW - Siberian Craton
KW - Sr-Nd-Pb isotopes
UR - http://www.scopus.com/inward/record.url?scp=85033551994&partnerID=8YFLogxK
U2 - 10.1016/j.lithos.2017.10.021
DO - 10.1016/j.lithos.2017.10.021
M3 - Article
AN - SCOPUS:85033551994
VL - 296-299
SP - 67
EP - 78
JO - Lithos
JF - Lithos
SN - 0024-4937
ER -
ID: 52349893