Melt viscosity, temperature and transport processes, Troodos ophiolite, Cyprus

摘要: Abstract The lava section in the Troodos ophiolite, Cyprus, is chemically stratified and divided into a shallow sequence with low TiO 2 content deeper high content. We calculate viscosity at magmatic temperature based on major element chemistry of lavas Cyprus Crustal Study Project (CCSP) Holes CY-1 1A. find that typical low-Ti have two to three orders magnitude lower than high-Ti lavas. This implies that, after eruption on-axis, would been able flow down same slope faster farther calculated increases systematically from lava–sediment interface bottom composite Hole CY-1/1A. suggests an efficient process segregation by upper flanks paleo rise may responsible for chemical stratification pile. Calculated molar Mg/(Mg+Fe), or Mg#, decrease down-section, while SiO increases. Correlation Mg# underlying, crustal plutonic rocks sampled CCSP CY-4 shows came high-temperature, magma reservoir which now represented high-Mg# pyroxenite cumulates, were erupted lower-temperature, mid-crustal gabbroic cumulates Mg#.