Experimental determination of REE partition coefficients between amphibole and basaltic to andesitic liquids at high pressure |
| |
Authors: | TH Green NJ Pearson |
| |
Institution: | School of Earth Sciences, Macquarie University, North Ryde, NSW 2113, Australia |
| |
Abstract: | Amphibole/liquid partition coefficients for the REE(Damph/liqREE) obtained from natural rocks increase systematically with bulk rock compositional change from basalt to rhyolite and are higher for the middle to heavy REE. Five new experimentally determined sets of DREE (La, Sm, “Eu2+”, Ho, Lu)and 4 published sets are similar to these data and provide values for use in geochemical modelling of magmatic processes involving amphibole, over a range of temperature, pressure and oxygen fugacity. The partition coefficients increase significantly with decreasing temperature, and increase slightly with increasing oxygen fugacity. Pressure does not appear to have a major effect, although one data set suggests increased pressure lowers Damph/liqREE in a basaltic composition. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|