caa a22 4500 445389990 CHVBK 20180317143043.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00710-011-0177-3 doi (NATIONALLICENCE)springer-10.1007/s00710-011-0177-3 Sphene and zircon in the Highland Range volcanic sequence (Miocene, southern Nevada, USA): elemental partitioning, phase relations, and influence on evolution of silicic magma [Elektronische Daten] [Lindy Colombini, Calvin Miller, Guilherme Gualda, Joseph Wooden, Jonathan Miller] Sphene is prominent in Miocene plutonic rocks ranging from diorite to granite in southern Nevada, USA, but it is restricted to rhyolites in coeval volcanic sequences. In the Highland Range volcanic sequence, sphene appears as a phenocryst only in the most evolved rocks (72-77 mass% SiO2; matrix glass 77-78 mass% SiO2). Zr-in-sphene temperatures of crystallization are mostly restricted to 715 and 755°C, in contrast to zircon (710-920°C, Ti-in-zircon thermometry). Sphene rim/glass Kds for rare earth elements are extremely high (La 120, Sm 1200, Gd 1300, Lu 240). Rare earth elements, especially the middle REE (MREE), decrease from centers to rims of sphene phenocrysts along with Zr, demonstrating the effect of progressive sphene fractionation. Whole rocks and glasses have MREE-depleted, U-shaped REE patterns as a consequence of sphene fractionation. Within the co-genetic, sphene-rich Searchlight pluton, only evolved leucogranites show comparable MREE depletion. These results indicate that sphene saturation in intruded and extruded magmas occurred only in highly evolved melts: abundant sphene in less silicic plutonic rocks represents a late-stage ‘bloom' in fractionated interstitial melt. Springer-Verlag, 2011 Colombini Lindy Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, 37235-1805, Nashville, TN, USA aut Miller Calvin Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, 37235-1805, Nashville, TN, USA aut Gualda Guilherme Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, 37235-1805, Nashville, TN, USA aut Wooden Joseph Stanford-USGS Micro Analysis Center, SHRIMP Lab, Stanford University, Green Earth Sciences Building, 367 Panama Street Room 89, 94305, Stanford, CA, USA aut Miller Jonathan Department of Geology, San Jose State University, Duncan Hall 320, 95112-0102, San Jose, CA, USA aut Mineralogy and Petrology Springer Vienna 102/1-4(2011-10-01), 29-50 0930-0708 102:1-4<29 2011 102 710 https://doi.org/10.1007/s00710-011-0177-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-011-0177-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Colombini Lindy Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, 37235-1805, Nashville, TN, USA aut NATIONALLICENCE 700 1- Miller Calvin Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, 37235-1805, Nashville, TN, USA aut NATIONALLICENCE 700 1- Gualda Guilherme Department of Earth and Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, 37235-1805, Nashville, TN, USA aut NATIONALLICENCE 700 1- Wooden Joseph Stanford-USGS Micro Analysis Center, SHRIMP Lab, Stanford University, Green Earth Sciences Building, 367 Panama Street Room 89, 94305, Stanford, CA, USA aut NATIONALLICENCE 700 1- Miller Jonathan Department of Geology, San Jose State University, Duncan Hall 320, 95112-0102, San Jose, CA, USA aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer Vienna 102/1-4(2011-10-01), 29-50 0930-0708 102:1-4<29 2011 102 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer