Investigating the mantle source of the lunar crater volcanic field, Nevada
Lee, Jacob William
MetadataShow full item record
Incompatible element ratios in melt inclusions can provide information on mantle source components. Additionally, trace element concentrations in high-Mg olivines can be used to infer mantle source lithology. Lunar Crater Volcanic Field (LCVF) in central Nevada contains basalts compositionally similar to ocean island basalts (OIB), and several crustal and mantle features suggest an underlying mantle plume. Consequently, I used olivine-hosted melt inclusions, and olivine compositions to investigate source lithology and petrogenesis. Melt inclusions from Easy Chair Crater (ECC) in the LCVF are relatively Cl-rich and have Cl/K abundances similar to OIB. Ni and Mn concentrations in forsteritic olivines from ECC (including some extremely forsteritic olivines) indicate a significant amount of pyroxenite may have been present in the melt source. This evidence, combined with high equilibration temperatures in mantle-derived xenoliths from LCVF and gravitational and topographic anomalies in the region, may indicate the presence of a mantle plume beneath LCVF.