Role of Pyroxenite Mantle in the Formation of the Mesozoic Karoo Plume Melts

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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.

In: Geochemistry International, Vol. 59, No. 4, 16.04.2021, p. 357-376.

Research output: Contribution to journal › Article › peer-review

Author

Sushchevskaya, N. M. ; Sobolev, A. V. ; Leitchenkov, G. L. ; Batanova, V. G. ; Belyatsky, B. V. ; Zhilkina, A. V. / Role of Pyroxenite Mantle in the Formation of the Mesozoic Karoo Plume Melts : Evidence from the Western Queen Maud Land, East Antarctica. In: Geochemistry International. 2021 ; Vol. 59, No. 4. pp. 357-376.

BibTeX

@article{f414c54cdc4e4993835b0b66d10df582,

title = "Role of Pyroxenite Mantle in the Formation of the Mesozoic Karoo Plume Melts: Evidence from the Western Queen Maud Land, East Antarctica",

abstract = "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.",

keywords = "Ahlmannryggen, isotope signatures, Karoo plume, lithophile element geochemistry, olivines, picritic magmas, Queen Maud Land",

author = "Sushchevskaya, {N. M.} and Sobolev, {A. V.} and Leitchenkov, {G. L.} and Batanova, {V. G.} and Belyatsky, {B. V.} and Zhilkina, {A. V.}",

year = "2021",

month = apr,

day = "16",

doi = "10.1134/S001670292104008X",

language = "English",

volume = "59",

pages = "357--376",

journal = "Geochemistry International",

issn = "0016-7029",

publisher = "МАИК {"}Наука/Интерпериодика{"}",

number = "4",

}

RIS

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.

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