Abstract
Pb and Nd isotopic composition of granitoids from the Lake Zone, Mongolian and Gobi Altai was analyzed to decipher the continental crustal growth of heterogeneous terranes of the Central Asian orogenic belt. The granitoids were generated in the Late Neoproterozoic–Early Paleozoic juvenile crust of the Lake Zone during island-arc, accretion, and post-accretionary stages at 535–440 Ma. Their Pb and Nd isotopic characteristics are similar and illustrate the dominance of juvenile material in the source of granitoids of all three stages. An insignificant terrigenous contribution in their source provides dispersion of the Pb isotopic composition at a weak effect on the Nd isotopic composition. The Pb and Nd isotopic study of Middle Paleozoic (∼380–355 Ma) synkinematic and Late Paleozoic (∼350–270 Ma) post-kinematic granitoids in the Mongolian and Gobi Altai revealed a significant heterogeneity of their source, which is mainly inherited from terrigenous rocks of the Altai accretionary wedge variably metamorphosed under greenschist to granulite facies conditions. The main source of Altai terrigenous sediments was volcanic rocks from the Lake Zone juvenile crust with subordinate contribution of more mature rocks from the Tuva-Mongolian and Dzabkhan microcontinents, which supplied sediments with highly radiogenic Pb and Nd isotopic composition. The Pb isotopic compositions of the granitoids from the Lake Zone, Mongolian and Gobi Altai, and also the Trans-Altai Gobi (Savatenkov et al., 2016) show that their mantle source has an elevated Th/U ratio compared to the depleted mantle (Kramers and Tolstikhin, 1997). This is a hallmark of the depleted mantle source of the Paleo-Asian province. Juvenile continental crust terrains of the Central Asian orogenic belt (Lake Zone and Trans-Altai Gobi terranes) were formed in various tectonics settings. The island-arc complexes of the Lake Zone developed near the Precambrian Tuva-Mongolian and Dzabkhan microcontinents, which supplied terrigenous material with highly radiogenic Pb to granitoid sources. The Trans-Altai Gobi was a system of ensimatic island arcs separated from the Siberian paleocontinent by a continent-dipping subduction zone, which prevented the influx of ancient terrigenous material from the continent.
Similar content being viewed by others
Notes
Geochemical and isotopic (Nd, Pb) characteristics of granitoids from the Lake Zone, Mongolian and Gobi Altai are given in ESM_1.xls (Supplementary) to the Russian and English on-line version of the paper on sites https://elibrary.ru/ and http://link.springer.com/, respectively.
REFEENCES
Dolgopolova, A., Seltmann, R., Armstrong, R., et al., Sr–Nd–Pb–Hf isotope systematics of the Hugo Dummett Cu–Au porphyry deposit (Oyu Tolgoi, Mongolia), Lithos, 2013, vol. 164–167, pp. 47–64.
Frost, B.R., Barnes, C.G., Collins, W.J., et al., A geochemical classification for granitic rocks, J. Petrol., 2001, vol. 42, pp. 2033–2048.
Hala, J., Pb isotopes – a multi–function tool for assessing tectonothermal events and crust–mantle recycling at Late Archaean convergent margins, Lithos, 2018, vol. 320–321, pp. 207–221.
Harris, N.B.W., Pearce, J.A., and Tindle, A.G., Geochemical characteristics of collision–zone magmatism, Collision Tectonics, Coward, M.P. and Rles. A.C., Eds., Geol. Soc. Lon. Spec. Publ., 1986, vol. 19, pp. 67–81.
http://georoc.mpch–mainz.gwdg.de
Ishizuka, O., Taylor, R.N., Yuasa, M., et al., Processes controlling along–arc isotopic variation of the southern Izu–Bonin Zrc, Geochem. Geophys. Geosyst., 2007, vol. 8. https://doi.org/10.1029/2006GC001475
Jahn, B.–M., The central Asian orogenic belt and growth of the continental crust in the Phanerozoic, Aspects of the Tectonic Evolution of China, Malpas, J., Fletcher, C.J.N., Ali, J.R., Aitchison, J.C., Eds., Geol. Soc. Lon. Spec. Publ., 2004, vol. 226, pp. 73–100.
Jian, P., Kroner, A., Jahn, B.–M., et al., Zircon dating of Neoproterozoic and Cambrian ophiolites in West Mongolia and implications for the timing of orogenic processes in the central part of the Central Asian orogenic belt, Earth Sci. Rev., 2014, vol. 133, pp. 62–93.
Jiang, Y.D., Schulmann, K., Kroner, A., et al., Neoproterozoic–Early Paleozoic peri–Pacific accretionary evolution of the Mongolian collage system: insights from geochemical and U–Pb zircon data from the Ordovician sedimentary wedge in the Mongolian Altai, Tectonics, 2017, vol. 36, pp. 2305–2331.
Kovach.V. P., Yarmolyuk. V. V., Kovalenko. V.I. et al., Composition, sources, and mechanisms of formation of the continental crust of the Lake Zone of the Central Asian Caledonides. II. Geochemical and Nd isotope data, Petrology, 2011, vol. 19, pp. 399–425.
Kovalenko, V.I., Pukhtel, I.S., Yarmolyuk, V.V., et al., The Sm–Nd Isotopic Systematics of Ophiolites in the Ozernaya Zone (Mongolia), Stratigraphy. Geol. Correlation, 1996a, vol. 4, pp. 107–113.
Kovalenko V.I., Yarmolyuk V.V., Pukhtel’ I.S., et al., Igneous rocks and magma sources of the Ozernaya Zone ophiolites, Mongolia, Petrology, 1996b, vol. 4, pp. 420–459.
Kovalenko, V.I., Yarmolyuk, V.V., Kovach, V.P., et al., Multiple magma sources for the peralkaline granitoids and related rocks of the Khaldzan Buregte Group of massifs, Western Mongolia: isotopic (neodymium, strontium, and oxygen) and geochemical data, Petrology, 2004, vol. 12, pp. 497–518.
Kovalenko, V.I., Yarmolyuk, V.V., Kovach, V.P., et al., Isotope provinces, mechanisms of generation and sources of the continental crust in the central asian mobil belt: geological and isotopic evidence, J. Asian Earth Sci., 2004, vol. 23, pp. 605–627.
Kozakov, I.K., Kovach, V.P., Yarmolyuk, V.V., et al., Crust–forming processes in the geologic development of the Tuva–Mongolia Massif: Sm–Nd isotopic and geochemical data for granitoids, Petrology, 2003, vol. 11, pp. 444–463.
Kozakov, I.K., Kovach, V.P., Bibikova, E.V., et al., Age and sources of granitoids in the junction zone of the Caledonides and Hercynides in Southwestern Mongolia: geodynamic implications, Petrology, 2007, vol. 15, pp. 126–150.
Kozakov, I.K., Kuznetsov, A.B., Erdenegargal, Ch., et al., Neoproterozoic complexes of the shelf cover of the Dzabkhan terrane basement in the Central Asian Orogenic Belt, Stratigraphy. Geol. Correlation, 2017, vol. 25, pp. 479–491.
Kozakov, I.K., Kozlovsky, A.M., Yarmolyuk, V.V., et al., Geodynamic environments of the origin of poly– and monometamorphic complexes in the Southern Altai metamorphic belt, Central Asian Orogenic Belt, Petrology, 2019, vol. 27, no. 3, pp. 223–257.
Kozlovsky, A.M., Yarmolyuk, V.V., Salnikova, E.B., et al., Late Paleozoic anorogenic magmatism of the Gobi Altai (SW Mongolia): tectonic position, geochronology and correlation with igneous activity of the Central Asian Orogenic Belt, J. Asian Earth Sci., 2015, vol. 113, pp. 524–541.
Kröner, A., Lehmann, J., Schulmann, K., et al., Lithostratigraphic and geochronological constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia: Early Paleozoic rifting followed by Late Paleozoic accretion, Am. J. Sci., 2010, vol. 310, pp. 523–574.
Kröner, A., Kovach, V., Belousova, E., et al., Reassessment of continental growth during the accretionary history of the Central Asian Orogenic Belt, Gondwana Res., 2014, vol. 25, pp. 103–125.
Kröner, A., Kovach, V.P., Kozakov, I.K., et al., Zircon ages and Nd–Hf isotopes in UHT granulites of the Ider complex: a cratonic terrane within the Central Asian Orogenic Belt in NW Mongolia, Gondwana Res., 2015, vol. 27, pp. 1392–1406.
Kramers, J.D. and Tolstikhin, I.N., Two terrestrial lead isotope paradoxes, forward transport modelling, core formation and the history of the continental crust, Chem. Geol., 1997, vol. 139, pp. 75–110.
Kruk, N.N., Continental crust of Gorny Altai: stages of formation and evolution, indicative role of granitoids, Russ. Geol. Geophys., 2015, vol. 56, pp. 1097–1113.
Kruk, N.N., Rudnev, S.N., Vladimirov, A.G., et al., Early–Middle paleozoic granitoids in gorny altai, russia: implications for continental crust history and magma sources, J. Asian Earth Sci., 2011, vol. 42, pp. 928–948.
Kuzmichev, A.B., Bibikova, E.V., and Zhuravlev, D.Z., Neoproterozoic (800 Ma) orogeny in the Tuva–Mongolia massif (Siberia): island arc–continent collision at the northeast Rodinia margin, Precambrian Res., 2001, vol. 110, pp. 109–126.
Kuzmichev, A., Kröner, A., Hegner, E., et al., The Shishkhid ophiolite, northern Mongolia: a key to the reconstruction of a Neoproterozoic island–arc system in central Asia, Precambrian Res., 2005, vol. 138, pp. 125–150.
Lehmann, J., Schulmann, K., Lexa, O., Corsini, M., et al., Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia, Am. J. Sci., 2010, vol. 310, pp. 575–628.
Letnikova E.F., Shkol’nik S.I., Letnikov F.A., et al., Main stages of tectonomagmatic activity of the Tuva–Mongolian microcontinent in the Precambrian: data on the U–Pb age of zircons, Dokl. Earth Sci., 2017, vol. 474, pp. 668–673.
Liu, X., Xu, J., Castillo, P.R., et al., The Dupal isotopic anomaly in the southern Paleo–Asian Ocean: Nd–Pb isotope evidence from ophiolites in Northwest China, Lithos, 2014, vol. 189, pp. 185–200.
Maniar, P.D. and Piccoli, P.M., Tectonic discrimination of granitoids, Geol. Soc. Am. Bull., 1989, vol. 101, pp. 635–643.
Mel’nikov, N.N., Errors of the double spiking technique in the isotopic analysis of common lead, Geochem. Int., 2005, vol. 43, no. 12, pp. 1228–1234.
Millot, R., Allegre, C.–J., Gaillardet, J., and Roy, S., Lead isotopic systematics of major river sediments: a new estimate of the Pb isotopic composition of the upper continental crust, Chem. Geol., 2004, vol. 203, pp. 75–90.
Ovchinnikova, G.V., Krylov, D.P., Kozakov, I.K., et al., Sources of granitoids in the Tuva–Mongolian microcontinent and surrounding structures: evidence from Pb, Nd, and O isotopic systematics, Petrology, 2009, vol. 17, pp. 570–578.
Petrograficheskii kodeks Rossii: Magmaticheskie, metamorficheskie, metasomaticheskie, impaktnye obrazovaniya (Petrographic Code of Russia: Magmatic, Metamorphic, Metasomatic, and Impact Rocks), Bogatikov, O.A, Petrov, O.V, Morozov, A.F, Sharpenok, L.V, Eds., St. Petersburg: VSEGEI, 2009.
Pfander, J.A., Jochum, K.P., Kozakov, I.K., et al., Coupled evolution of back–arc and island arc–like mafic crust in the Late–Neoproterozoic Agardag Teschem ophiolite, Central Asia: evidence from trace element and Sr–Nd–Pb isotope data, Contrib. Mineral. Petrol., 2002, vol. 143, pp. 154–174.
Plank, T. and Langmuir, C.H., The chemical composition of subducting sediment and its consequences for the crust and mantle, Chem. Geol., 1998, vol. 145, pp. 325–394.
Rudnev, S.N., Izokh, A.E., Kovach, V.P., et al., Age, composition, sources, and geodynamic environments of the origin of granitoids in the northern part of the Ozernaya Zone, Western Mongolia: growth mechanisms of the Paleozoic continental crust, Petrology, 2009, vol. 17, pp. 439–475.
Rudnev, S.N., Izokh, A.E., Borisenko, A.S., et al., Early Paleozoic magmatism in the Bumbat—Hairhan area of the Lake Zone in Western Mongolia (geological, petrochemical, and geochronological data), Russ. Geol. Geophys., 2012, vol. 53, no. 5, pp. 425–441.
Rudnev, S.N., Kovach, V.P., and Ponomarchuk, V.A., Vendian—Early Cambrian island–arc plagiogranitoid magmatism in the Altai–Sayan folded area and in the Lake Zone of Western Mongolia (geochronological, geochemical, and isotope data), Russ. Geol. Geophys., 2013, vol. 54, pp. 1272–1287.
Rudnev, S.N., Izokh, A.E., Borisenko, A.S., Gas’kov, I.V., Granitoid magmatism and metallogeny of the Lake Zone in Western Mongolia (by the example of the Bumbat—Hairhan area), Russ. Geol. Geophys., 2016, vol. 57, pp. 207–224.
Savatenkov, V.M., Kozlovsky, A.M., Yarmolyuk, V.V., and Smirnova, Z.B., Pb isotope composition of granitoids from the Hercynides of the Central Asian Orogenic Belt: evidence for growth of the juvenile crust, Dokl. Earth Sci., 2016, vol. 470, pp. 985–989.
Savatenkov, V.M., Yarmolyuk, V.V., Kozlovsky, A.M., et al., Nd and Pb isotopic composition of granitoids in the Khangai batholith as an indicator of crust–forming processes in the terranes of the Central Asian Orogenic Belt, Petrology, 2018, vol. 26, pp. 351–367.
Stacey, J.S. and Kramers, J.D., Approximation of terrestrial lead isotope evolution by a two–stage model, Earth Planet. Sci. Lett., 1975, vol. 26, pp. 207–221.
Sun, S.S. and McDonough, W.F., Chemical and isotopic systematic of oceanic basalts: implications for mantle composition and processes, Implications for Mantle Composition and Processes. Magmatism in the Ocean Basins, Saunders, A.D. and Norry, M.J., Geol. Soc. Spec. Publ. London, 1989, vol. 42, 313–345.
Tanaka, T., Togashi, S., Kamioka, H., et al., Jndi-1: a neodymium isotopic reference in consistency with La Jolla neodymium, Chem. Geol., 2000, vol. 168, pp. 279–281.
Tong, Y., Wang, T., Jahn, B.–M., et al., Post–accretionary permian granitoids in the chinese altai orogen: geochronology, petrogenesis and tectonic implications, Am. J. Sci., 2014, vol. 314, pp. 80–109.
Wang, T., Jahn, B.–M., Kovach, V.P., et al., Nd–Sr isotopic mapping of the Chinese Altai and implications for continental growth in the Central Asian Orogenic Belt, Lithos, 2009, vol. 110, pp. 359–372.
Xiao, W.J., Windley, B.F., Yuan, C., et al., Paleozoic multiple subduction–accretion processes of the southern Altaids, Am. J. Sci., 2009, vol. 309, pp. 221–270.
Yarmolyuk, V.V., Kovalenko, V.I., Kozlovsky, A.M., et al., Crust–forming processes in the Hercynides of the Central Asian foldbelt, Petrology, 2008, vol. 16, p. 679–709.
Yarmolyuk V.V., Kovach V.P., Kovalenko V.I., et al., Composition, sources, and mechanism of continental crust growth in the Lake Zone of the Central Asian Caledonides: I. Geological and geochronological data, Petrology, 2011, vol. 19, pp. 55–78.
Yarmolyuk, V.V., Kovach, V.P., Kozakov, I.K., et al., Mechanisms of continental crust formation in the Central Asian Foldbelt, Geotectonics, 2012, vol. 46, no. 4, pp. 251–272.
Yarmolyuk, V.V., Kozlovsky, A.M., and Lebedev, V.I., Neoproterozoic magmatic complexes of the Songino Block (Mongolia): a Problem of Formation and Correlation of Precambrian terranes in the Central–Asian Orogenic Belt, Petrology, 2017, vol. 25, pp. 365–395.
Zartman, R.E. and Doe, B.R., Plumbotectonics – the model, Tectonophysics, 1981, vol. 75, pp. 35–162.
ACKNOWLEDGMENTS
We are grateful to A.V. Chugaev, whose comments significantly improved out understanding of obtained data. I.K. Kozakov is thanked for kindly given granitoid samples of Mongolian and Gobi Altai.
Funding
This work was carried out at the laboratories of the Institute of Precambrian Geology and Geochronology, Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry of the Russian Academy of Sciences, and Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences under government-financed research programs (nos. 0136-2019-0012 and 0153-2019-0005) and was supported by the Russian Foundation for Basic Research and MECSS (project nos. 20-05-00401, 18-05-00105, 19-05-00434, and 20-55-44001).
Author information
Authors and Affiliations
Corresponding authors
Additional information
Translated by M. Bogina
Supplementary material
Rights and permissions
About this article
Cite this article
Savatenkov, V.M., Kozlovsky, A.M., Yarmolyuk, V.V. et al. Pb and Nd Isotopic Data on Granitoids from the Lake Zone, Mongolian and Gobi Altai with Implications for the Crustal Growth of the Central Asian Orogenic Belt. Petrology 28, 403–417 (2020). https://doi.org/10.1134/S0869591120050045
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0869591120050045