Abstract

A new Wenlockian zircon U–Pb age (~426 Ma) of the Overmaraat-Gol nepheline syenite (foyaite, juvite) pluton in the SW Lake Hovsgol area (Northern Mongolia) prompts a long history of alkaline magmatism in the western Central Asian Orogenic Belt, exceeding the duration of the Devonian and Permian–Triassic events. The LILE and HFSE patterns of pluton samples analyzed by X-ray fluorescence (XRF) and inductively coupled plasma (ICP-MS) methods indicate intrusion in a complex tectonic setting during interaction of a mantle plume with accretionary-collisional complexes that previously formed on the active continental margin. As a result, the parent magma had a heterogeneous source with mixed mantle (PREMA and EM) and crustal components. This source composition is consistent with Nd–Sr isotope ratios of the Overmaraat-Gol alkaline rocks, from −0.1 to −1.2 ε Nd (t) and from ~0.706 to 0.707 87 Sr/ 86 Sr(t).

Original languageEnglish
Article number170
Number of pages13
JournalMinerals
Volume9
Issue number3
DOIs
Publication statusPublished - 10 Mar 2019

Keywords

  • Alkaline magmatism
  • Central Asian Orogenic Belt
  • Geochemistry
  • Northern Mongolia
  • Plume-lithosphere interaction
  • U-Pb isotope geochronology
  • MANTLE PLUMES
  • ND ISOTOPE EVIDENCE
  • plume-lithosphere interaction
  • geochemistry
  • ALTAI
  • ROCKS
  • KUZNETSK-ALATAU
  • TRACE-ELEMENT
  • MAJOR-ELEMENT
  • CARBONATITES
  • alkaline magmatism
  • SM-ND
  • SR

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