@article{102,
  keywords = {alkaline Pluton, Central Asian Orogenic Belt, geochemistry, Lake Zone, U-Pb zircon dating},
  author = {D. Burianek and Vojt{\v e}ch Janou{\v s}ek and Pavel Han{\v z}l and Yingde Jiang and Karel Schulmann and Ondrej Lexa and Battushig Altanbaatar},
  title = {Petrogenesis of the Late Carboniferous Sagsai Pluton in the SE Mongolian Altai},
  abstract = {Sagsai Pluton intruded the low-grade metavolcanosedimentary complex of the Cambrian Tugrug Fm. in the Sagsai river valley SW of Tsogt soum, Gobi-Altai aimag (SE Mongolian Altai). This oval body ( 9 {\texttimes} 12 km) is composed mainly of amphibole monzogabbros to quartz diorites, biotite to amphibole-biotite syenites to quartz monzonites. It is intruded by anatectic two-mica granites along the W rim. The abundant mafic microgranular enclaves enclosed by syenites to quartz monzonites are interpreted as an evidence of vigorous magma mingling and mixing. The newly obtained LA ICP-MS zircon ages for two samples of quartz monzonites gave emplacement ages of 307 {\textpm} 1 Ma and 309 {\textpm} 2 Ma (2σ), respectively. They have εtHf values varying broadly from +2.4 to +11.6 ruling out a participation of an old, mature crust. One gabbro body gave zircon U-Pb age of 322 {\textpm} 2 Ma with positive εtHf values of +7.4 to +11.5. The latter suggest an exclusively juvenile, depleted mantle-derived magma source. According to calculated P-T conditions, we propose three main stages in the Sagsai Pluton evolution. The gabbro started to grow at >1000 {\textdegree}C and 0.8-0.9 GPa. The ensuing magma mixing with crustal melts and final crystallization of gabbro occurred at similar P-T conditions (740-830 {\textdegree}C and 0.5-0.6 GPa) as partial melting of migmatite xenoliths in the Sagsai Pluton. The P-T conditions of the Sagsai Pluton final emplacement calculated from quartz syenite (c. 600 to 670 {\textdegree}C and 0.4-0.5 GPa) are consistent with the mineral assemblage in the contact aureole (cordierite-biotite and biotite-chlorite schists). The magmatic evolution of Sagsai Pluton confirms a model of deep lithosphere thermal anomaly associated with heterogeneous melting of crust in a post-subduction extensional regime, perhaps shortly after the slab break-off.},
  year = {2016},
  booktitle = {Journal of GEOsciences},
  journal = {Journal of GEOsciences},
  series = {Journal of GEOsciences},
  volume = {61},
  pages = {67{\textendash}92},
  url = {http://www.jgeosci.org/detail/jgeosci.207/abstract},
  doi = {http://dx.doi.org/10.3190/jgeosci.207},
}