Geochemical and Lu/Hf isotopic (LA–ICP–MS) systematics of detrital zircons from the Upper Ordovician sandstones of the Bashkir Uplift (Southern Urals)

Analyses of trace elements and Lu/Hf isotopes have been carried out in already U–Pb dated detrital zircons from the Upper Ordovician sandstones of the southern part of the Bashkir Uplift. The concentrations of trace elements in the zircons suggest that they were derived from rocks of intermediate (62%), basic (24%), and felsic (9%) compositions as well as alkaline rocks (2%). The Lu/Hf systematics of the zircons demonstrated a wide variation of both εHf (from +9.5 to–8.7) and model ages of the parental rocks (1.60 Ga < TDM C < 3.28 Ga). Comparison of the isotopic–geochemical characteristics of the detrital zircons from different levels of the Riphean–Paleozoic sequence of the Bashkir Uplift against those from the Early Cambrian Brusov Formation of the Mezen Basin and Early Neoproterozoic Dzhezhim sandstones of Timan Ridge suggests that at the end of the Late Precambrian near the Uralian margin of Baltica a large block of Late Mesoproterozoic–Early Neoproterozoic crust existed, comprising a significant proportion of melanocratic rocks. © 2017, Pleiades Publishing, Ltd.

Romanyuk T.V.1, 2, 3 , Kuznetsov N.B. 1, 2, 3, 4 , Belousova E.A.3 , Degtyarev K.E.4 , Maslov A.V.5 , Gorozhanin V.M.6 , Gorozhanina E.N.6 , Pyzhova E.S. 7
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  • 1 Schmidt Joint Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, 123242, Russian Federation
  • 2 Gubkin Russian State University of Oil and Gas, Moscow, 119991, Russian Federation
  • 3 The ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC), Macquarie University, Sydney, Australia
  • 4 Geological Institute, Russian Academy of Sciences, Moscow, 119017, Russian Federation
  • 5 Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620016, Russian Federation
  • 6 Institute of Geology, Ufa Scientific Center, Russian Academy of Sciences, Ufa, 620016, Russian Federation
  • 7 Peoples’ Friendship University of Russia, Moscow, Russian Federation
Gallium; Geochemistry; Geochronology; Isotopes; Lead; Rocks; Sandstone; Trace elements; Uranium; Alkaline rocks; Detrital zircon; Early cambrians; Geochemical characteristic; Large blocks; Neoproterozoic; Precambrian; Southern Urals; Lutetium; detrital deposit; isotopic composition; Ordovician; sandstone; sediment chemistry; trace element; uranium-lead dating; zircon; Urals
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