Abstract
The paper summarizes major and trace-element compositions and Sm–Nd isotope data on metabasites (amphibolites) and gabbroids of the Onot granite–greenstone block in the Sharyzhalgai basement uplift, southwestern Siberian craton. The Onot block consists of tectonically combined nappes of the Paleoarchean tonalite–trondhjemite–granodiorite (TTG) complex and the metasedimentary-volcanic complex of the greenstone belt (GB). The Mezoarchean (∼2.88 Ga) metabasalts of the greenstone belt and Paleoproterozoic (∼1.86 Ga) gabbronorites and vein gabbros were formed at rifting and postcollisional extension, respectively. The Archean metabasites of the greenstone belt and enclaves in the TTG complex compositionally correspond to low-Ti tholeiitic basalts and basaltic andesites. The basaltic rocks are characterized by flat REE patterns [(La/Sm)n = 0.9–1.9], depletion in Nb relative to Th and La (Nb/Nb* = 0.4–1.1), and a wide range of mostly positive εNd(T) values (from +5.2 to –1.0). The enrichment of the basaltic andesite in incompatible elements, its Eu minimum, and negative εNd(T) values resulted from contamination by Paleoarchean TTG gneisses, that form the basement of GB. The Paleoproterozoic gabbronorites have high Mg# and extremely low concentrations of Ti and incompatible elements. The rocks are characterized by low (Nb/Y)PМ (0.8–1.0), negative εNd(T) values (from 0 to –1.4), and weak enrichment in Th and LREE relative to Nb. The vein gabbros have low (La/Sm)n, positive εNd(T) values of +2.8 and +0.3, and a negative Nb anomaly (Nb/Nb* = 0.3–0.4). The trace element-composition of the amphibolites, gabbronorites, and gabbros and the results of geochemical modeling indicate that the parental melts were derived mainly from weakly depleted mantle sources. The Nd isotope composition of the Paleoproterozoic gabbroids resulted from the evolution of the heterogeneous Archean lithospheric mantle. Variations in the isotope and trace-element composition of the amphibolites reflect the initially depleted nature of the Mezoarchean mantle and its metasomatic alteration by fluids/melts, which occurred before its melting at ∼2.88 Ga. The geochemical and Nd isotopic characteristics of gabbronorites and gabbros indicate that the lithospheric mantle had become progressively more heterogeneous by the Paleoproterozoic due to preceding Archean processes. The variable depletion of both the Archean and the Paleoproterozoic mafic rocks in Nb relative to Th and La may be explained by mantle metasomatism and does not reflect the geodynamic settings of the mafic magmatism.
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Notes
Mineral symbols: Amph—amphibole, Bt—biotite, Cpх—clinopyroxene, Mag—magnetite, Opх—orthopyroxene, Pl—plagioclase, and Qtz—quartz.
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ACKNOWLEDGMENTS
The authors thank A.A. Shchipansky and A.I. Slabunov for constructive comments, which helped us to improve the manuscript.
Funding
This study was supported by the Russian Foundation for Basic Research, project no. 20-05-00265. Data on the composition of the gabbroids were systematized under a government-financed research project for Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences. The Sm−Nd isotope analyses were conducted at the GEOANALITIK Center for the Collective Use of Analytical Equipment at Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, in Yekaterinburg. The acquisition of additional equipment for the Center for the Collective Use and its further development were supported by the Ministry of Science and Higher Education of the Russian Federation under Agreement 075-15-2021-680.
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Turkina, O.M., Izokh, A.E., Lavrenchuk, A.V. et al. Composition and Isotope Parameters of Metabasalts and Gabbroids of the Onot Granite–Greenstone Block, Southwestern Siberian Platform, as Indicators of Lithospheric Mantle Evolution from the Archean to Paleoproterozoic. Petrology 30, 499–522 (2022). https://doi.org/10.1134/S0869591122040063
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DOI: https://doi.org/10.1134/S0869591122040063