Poster Number 47
See more from this Division: General Discipline Sessions
See more from this Session: Mineralogy/Crystallography; Petrology, Experimental; Igneous; Metamorphic (Posters)
Abstract:
Host rocks consist of interbedded psammites, semipelites, and conglomerates and calc-silicate schist interbedded with marble. Prograde assemblages in the semipelites include quartz + feldspar ± biotite ± garnet ± muscovite ± sillimanite ± kyanite ± staurolite, The contact between the plutonic and metamorphic rocks is covered, but is subparallel to foliation in the host rocks. Enclaves in the pluton consist of diatexite, calc-silicate schist, marble, gneiss, and surmicaceous enclaves, range in size from a few centimeters to several meters, and have lenticular to rectangular shapes. Diatexite consists of quartz + feldspar + biotite ± garnet ± muscovite ± kyanite ± sillimanite ± staurolite. The presence of metacarbonate xenoliths and similar prograde assemblages in the diatexite and host rocks suggest that the plutonhost-rock contact is intrusive.
Bivariate plots generally produce scattered arrays, but some are linear. Arrays on element ratio plots are not hyperbolic, thus ruling out magma mixing. The degree of scatter on many element-element plots suggests that parental melts segregated from multiple sources and accumulated at the level of exposure.
See more from this Division: General Discipline Sessions
See more from this Session: Mineralogy/Crystallography; Petrology, Experimental; Igneous; Metamorphic (Posters)