SOURCES OF PALEOZOIC AND MESOZOIC ALKALINE MAFIC MAGMATISM IN THE WESTERN PART OF ALTAI-SAYAN FOLD REGION (based on Pb-Pb isotopic data)

被引：0

作者：

Vrublevskii, Vassily V. ^{[1
]}

Chugaev, Andrey V. ^{[2
]}

Kotel'nikov, Aleksey D. ^{[3
,4
]}

Tishin, Platon A. ^{[5
]}

机构：

[1] Natl Res Tomsk State Univ, Geol & Geog Fac, Dept Dynam Geol, Tomsk, Russia

[2] Russian Acad Sci, Inst Geol Ore Deposits Petrog Mineral & Geochem, Moscow, Russia

[3] Natl Res Tomsk State Univ, Geol & Geog Fac, Lab Geokart, Tomsk, Russia

[4] Natl Res Tomsk State Univ, Geol & Geog Fac, Lab Geokart, Tomsk, Russia

[5] Natl Res Tomsk State Univ, Fac Geol & Geog, Tomsk, Russia

来源：

GEOSFERNYE ISSLEDOVANIYA-GEOSPHERE RESEARCH | 2023年 / 03期

基金：

俄罗斯科学基金会;

关键词：

alkaline-mafic magmatism; lead isotopes; mantle plume; subcontinental lithospheric mantle; Kuznetsk Alatau; Minusa trough; Central Asian fold belt; GEOCHEMICAL EVIDENCE; FLOOD BASALTS; ND; SR; PETROGENESIS;

D O I：

10.17223/25421379/28/1

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The lead isotope composition of igneous rocks has been studied in the Mesozoic (Minusa trough basanites, similar to 8070 Ma) and Paleozoic (Kuznetsk Alatau gabbro-foidolite-foyaite intrusions, similar to 500-400 Ma) alkaline mafic complexes of the Southern Siberia. The analysis was performed on precision MC-ICP-MS equipment Nu Instruments Plasma 021 and Thermo Scientific Neptune Plus. Variations of initial Pb-Pb isotopic ratios (Pb-206/Pb-204 17.92-19.09, Pb-207/Pb-204 15.53-15.57(sic) Pb-208/Pb-204 37.49-39.01) suggest heterogeneous mantle sources of primary alkaline mafic magma. Its main component could be material of moderately depleted PREMA-type mantle of sublithospheric plumes. The amount of SCLM (subcontinental lithospheric mantle) substance increases in the composition of later basanites. We assume the interaction of alkaline melts with mantle-crustal substrates, which are involved in the structure of orogens.

引用

页码：6 / 12

页数：7

共 5 条

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Plotnikov, A.V.
Kruk, N.N.
Vladimirov, A.G.
Kovach, V.P.
Zhuravlev, D.Z.
Moroz, E.N.
Doklady Akademii Nauk, 2003, 388 (02) : 228 - 233
[2] Sources and Evolution of Miocene–Pleistocene Alkaline Magmatism in the Northeast Part of the Arabian Plate: Evidence from Sr–Nd–Pb Isotope Data and K–Ar Geochronometry
A. V. Chugaev
A. V. Parfenov
V. A. Lebedev
I. V. Chernyshev
V. Oyan
Y. Özdemir
E. Oyan
Yu. V. Gol’tsman
I. V. Rassokhina
B. I. Gareev
G. A. Batalin
S. B. Pavlidis
Geochemistry International, 2024, 62 : 99 - 123
[3] Sources and Evolution of Miocene-Pleistocene Alkaline Magmatism in the Northeast Part of the Arabian Plate: Evidence from Sr-Nd-Pb Isotope Data and K-Ar Geochronometry
Chugaev, A. V.
Parfenov, A. V.
Lebedev, V. A.
Chernyshev, I. V.
Oyan, V.
Ozdemir, Y.
Oyan, E.
Gol'tsman, Yu. V.
Rassokhina, I. V.
Gareev, B. I.
Batalin, G. A.
Pavlidis, S. B.
GEOCHEMISTRY INTERNATIONAL, 2024, 62 (02) : 99 - 123
[4] Sources of Paleozoic Terrigenous Rocks from the Oldoi Terrane of the Central Asian Fold Belt Inferred from Isotopic-Geochemical (Sm-Nd) and Geochronological (U-Pb, LA-ICPMS) Data
Sorokin, A. A.
Smirnova, Yu. N.
Kotov, A. B.
Kovach, V. P.
Sal'nikova, E. B.
Popeko, L. I.
DOKLADY EARTH SCIENCES, 2012, 445 (02) : 969 - 972
[5] Sources of paleozoic terrigenous rocks from the oldoi terrane of the Central Asian fold belt inferred from isotopic-geochemical (Sm-Nd) and geochronological (U-Pb, LA-ICPMS) data
A. A. Sorokin
Yu. N. Smirnova
A. B. Kotov
V. P. Kovach
E. B. Sal’nikova
L. I. Popeko
Doklady Earth Sciences, 2012, 445 : 969 - 972

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