Research output: Contribution to journal › Article › peer-review
Early cretaceous alkaline magmatism of east antarctica : Peculiarities, conditions of formation, and relationship with the kerguelen plume. / Sushchevskaya, N. M.; Belyatsky, B. V.; Tkacheva, D. A.; Leitchenkov, G. L.; Kuzmin, D. V.; Zhilkina, A. V.
In: Geochemistry International, Vol. 56, No. 11, 11.2018, p. 1051-1070.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Early cretaceous alkaline magmatism of east antarctica
T2 - Peculiarities, conditions of formation, and relationship with the kerguelen plume
AU - Sushchevskaya, N. M.
AU - Belyatsky, B. V.
AU - Tkacheva, D. A.
AU - Leitchenkov, G. L.
AU - Kuzmin, D. V.
AU - Zhilkina, A. V.
PY - 2018/11
Y1 - 2018/11
N2 - Generalization of available literature and new original data showed that the Early Cretaceous high- Mg alkaline magmatism is confined to the ancient Lambert rift zone. Alkaline ultramafic rocks developed in the areas of this zone (Jetty Oasis, western flank of the Beaver and Radok lakes, Fisher and Meredith massifs) were derived through melting of metasomatized continental mantle at ~1270°С and at depths of 130–140 km. Variations of major and trace-element composition and the wide range in olivine composition (Fo91–Fo80) are consistent with its change through intrachamber crystallization. The average values of initial isotope composition of ultra-alkaline high-Mg basalts are as follows:143Nd/144Nd—0.512485,87Sr/86Sr—0.70637,207Pb/204Pb—15.671,206Pb/204Pb—18.391,208Pb/204Pb—38.409. They are close to the model ЕМII source and can be arbitrarily taken as the preliminary assessment of isotope composition of a source of Mesozoic melts. Based on lithophile element and isotope compositions, the alkaline high-Mg basaltic magmatism is thought to be related to the thermal impact of the Kerguelen plume on the lithospheric mantle of East Gondwana 120–110 Ma. Similar ancient deep-seated metasomatized eastern Gondwanan mantle, which contains carbonates and biotite and has an age of 2.4 Ga, was found in southern East Antarctica as well as in the north within eastern India.
AB - Generalization of available literature and new original data showed that the Early Cretaceous high- Mg alkaline magmatism is confined to the ancient Lambert rift zone. Alkaline ultramafic rocks developed in the areas of this zone (Jetty Oasis, western flank of the Beaver and Radok lakes, Fisher and Meredith massifs) were derived through melting of metasomatized continental mantle at ~1270°С and at depths of 130–140 km. Variations of major and trace-element composition and the wide range in olivine composition (Fo91–Fo80) are consistent with its change through intrachamber crystallization. The average values of initial isotope composition of ultra-alkaline high-Mg basalts are as follows:143Nd/144Nd—0.512485,87Sr/86Sr—0.70637,207Pb/204Pb—15.671,206Pb/204Pb—18.391,208Pb/204Pb—38.409. They are close to the model ЕМII source and can be arbitrarily taken as the preliminary assessment of isotope composition of a source of Mesozoic melts. Based on lithophile element and isotope compositions, the alkaline high-Mg basaltic magmatism is thought to be related to the thermal impact of the Kerguelen plume on the lithospheric mantle of East Gondwana 120–110 Ma. Similar ancient deep-seated metasomatized eastern Gondwanan mantle, which contains carbonates and biotite and has an age of 2.4 Ga, was found in southern East Antarctica as well as in the north within eastern India.
KW - East Antarctica
KW - Geochemistry of ultrabasic alkaline magmatism
KW - Kerguelen plume
KW - Lambert Rift
UR - http://www.scopus.com/inward/record.url?scp=85064135130&partnerID=8YFLogxK
U2 - 10.1134/S0016702918110071
DO - 10.1134/S0016702918110071
M3 - Article
AN - SCOPUS:85064135130
VL - 56
SP - 1051
EP - 1070
JO - Geochemistry International
JF - Geochemistry International
SN - 0016-7029
IS - 11
ER -
ID: 50032513