Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Role of Pyroxenite Mantle in the Formation of the Mesozoic Karoo Plume Melts : Evidence from the Western Queen Maud Land, East Antarctica. / Sushchevskaya, N. M.; Sobolev, A. V.; Leitchenkov, G. L.; Batanova, V. G.; Belyatsky, B. V.; Zhilkina, A. V.
в: Geochemistry International, Том 59, № 4, 16.04.2021, стр. 357-376.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Role of Pyroxenite Mantle in the Formation of the Mesozoic Karoo Plume Melts
T2 - Evidence from the Western Queen Maud Land, East Antarctica
AU - Sushchevskaya, N. M.
AU - Sobolev, A. V.
AU - Leitchenkov, G. L.
AU - Batanova, V. G.
AU - Belyatsky, B. V.
AU - Zhilkina, A. V.
N1 - Publisher Copyright: © 2021, Pleiades Publishing, Ltd. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/4/16
Y1 - 2021/4/16
N2 - Petrological and geochemical study of basalts and dolerites in East Antarctica, the formation of which is explained by the Karoo plume impact on the Queen Maud Land, revealed the presence of high-magnesium magmas, Fe-rich and depleted in incompatible elements, among the geochemically diverse magmas. Such high-Mg ferropicrites are scarce in other plume-related igneous provinces and their genesis is related to melting of a peculiar pyroxenite mantle source. These rocks were found only in the Ahlmannryggen and Vestfjella massifs in Antarctica and in the Letabo province in South Africa, correspond to the central part of the plume and likely the earliest eruptions. The studied dolerites are close to the parental melts. They have a relatively smoothed lithophile element pattern (from Th to Er), the lowered content of most compatible elements (Y, Yb, Lu), as well as the low 206Pb/204Pb = 17.33–17.37 and moderately radiogenic neodymium composition with 143Nd/144Nd from 0.51249 to 0.51259, which indicate a relatively old age of the pyroxenite component. All high-Ti basalts related to the Karoo–Maud plume point to the presence of this component in their compositions, but its proportion could significantly vary.
AB - Petrological and geochemical study of basalts and dolerites in East Antarctica, the formation of which is explained by the Karoo plume impact on the Queen Maud Land, revealed the presence of high-magnesium magmas, Fe-rich and depleted in incompatible elements, among the geochemically diverse magmas. Such high-Mg ferropicrites are scarce in other plume-related igneous provinces and their genesis is related to melting of a peculiar pyroxenite mantle source. These rocks were found only in the Ahlmannryggen and Vestfjella massifs in Antarctica and in the Letabo province in South Africa, correspond to the central part of the plume and likely the earliest eruptions. The studied dolerites are close to the parental melts. They have a relatively smoothed lithophile element pattern (from Th to Er), the lowered content of most compatible elements (Y, Yb, Lu), as well as the low 206Pb/204Pb = 17.33–17.37 and moderately radiogenic neodymium composition with 143Nd/144Nd from 0.51249 to 0.51259, which indicate a relatively old age of the pyroxenite component. All high-Ti basalts related to the Karoo–Maud plume point to the presence of this component in their compositions, but its proportion could significantly vary.
KW - Ahlmannryggen
KW - isotope signatures
KW - Karoo plume
KW - lithophile element geochemistry
KW - olivines
KW - picritic magmas
KW - Queen Maud Land
UR - http://www.scopus.com/inward/record.url?scp=85104494613&partnerID=8YFLogxK
U2 - 10.1134/S001670292104008X
DO - 10.1134/S001670292104008X
M3 - Article
AN - SCOPUS:85104494613
VL - 59
SP - 357
EP - 376
JO - Geochemistry International
JF - Geochemistry International
SN - 0016-7029
IS - 4
ER -
ID: 77056945