caa a22 4500 606149767 CHVBK 20210128100535.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00531-014-1065-y doi (NATIONALLICENCE)springer-10.1007/s00531-014-1065-y Depletion, cryptic metasomatism, and modal metasomatism of central European lithospheric mantle: evidence from elemental and Li isotope compositions of spinel peridotite xenoliths, Kozákov volcano, Czech Republic [Elektronische Daten] [L. Medaris Jr., Lukáš Ackerman, Emil Jelínek, Tomáš Magna] Spinel peridotite xenoliths in 4.1Ma basanite lava at Kozákov volcano vary in equilibration temperature from 675 to 1,135°C and provide a continuous sample of lithospheric mantle from the Moho to a depth of ~82km. The sub-Kozákov mantle is layered, consisting of an upper equigranular layer (UEL) from 32 to 45km, an intermediate protogranular layer (PGL) from 45 to 66km, and a lower equigranular layer (LEL) below 66km. Relative to primitive mantle, all three layers are depleted in major incompatible elements and heavy rare earth elements, with the UEL being most depleted among the three layers, consisting of harzburgite and having experienced >15% fractional melting. In contrast, the PGL and LEL experienced <10-15% melting and consist of lherzolite; the PGL and LEL overlap in major element composition, with the PGL displaying a decreasing degree of depletion with depth. Subsequent metasomatism by silicate melt led to cryptic enrichments in large-ion lithophile elements, light REE, and high field strength elements over all the layers and, locally, modal enrichment in orthopyroxene. Metasomatism is accompanied by elevated whole-rock Li contents (1.2-3.6ppm) and isotopically light δ7Li (−0.8 to −5.8‰). Lithium contents and δ7Li show no strong correlation with rock type or depth, although values of δ7Li are <−3.0‰ in the PGL and >−3.5‰ in the UEL and LEL. The layered structure and geochemical characteristics of sub-Kozákov lithospheric mantle are the product of Variscan or pre-Variscan melting, Variscan tectonics, and Neogene volcanism and metasomatism. Springer-Verlag Berlin Heidelberg, 2014 Spinel peridotite xenoliths nationallicence Central European lithospheric mantle nationallicence Geochemistry nationallicence Li isotopes nationallicence Geothermometry nationallicence Medaris Jr. L. Department of Geoscience, University of Wisconsin-Madison, 53706, Madison, WI, USA aut Ackerman Lukáš Institute of Geology v.v.i., Academy of Sciences of the Czech Republic, Prague, Czech Republic aut Jelínek Emil Institute of Geochemistry, Mineralogy, and Mineral Resources, Faculty of Science, Charles University, Prague, Czech Republic aut Magna Tomáš Czech Geological Survey, Prague, Czech Republic aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/8(2015-11-01), 1925-1956 1437-3254 104:8<1925 2015 104 531 https://doi.org/10.1007/s00531-014-1065-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1065-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Medaris Jr L. Department of Geoscience, University of Wisconsin-Madison, 53706, Madison, WI, USA aut NATIONALLICENCE 700 1- Ackerman Lukáš Institute of Geology v.v.i., Academy of Sciences of the Czech Republic, Prague, Czech Republic aut NATIONALLICENCE 700 1- Jelínek Emil Institute of Geochemistry, Mineralogy, and Mineral Resources, Faculty of Science, Charles University, Prague, Czech Republic aut NATIONALLICENCE 700 1- Magna Tomáš Czech Geological Survey, Prague, Czech Republic aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/8(2015-11-01), 1925-1956 1437-3254 104:8<1925 2015 104 531