Affordable Access

Publisher Website

Measurements of trace elements in basalts and their phenocrysts by laser probe microanalysis inductively coupled plasma mass spectrometry (LPMA-ICP-MS)

Elsevier B.V.
Publication Date
DOI: 10.1016/0009-2541(94)00121-n


Abstract An inductively coupled plasma mass spectrometer (ICP-MS) coupled to a modified Nd:YAG laser has been used for the in situ determination of trace-element zonation and partition coefficients in olivines and clinopyroxenes from natural phenocryst-matrix systems. The laser produces ablation craters of 20–40-μm diameter when operated in Q-switched mode and can provide spatial analyses of trace elements in minerals. The ICP-MS is calibrated against a synthetic trace-element glass reference material and can be used for the rapid determination of elements at low (sub-ppm) concentrations. Partition coefficients are presented for: (1) olivine in tholeiite glass from Stapafell, Iceland; and (2) olivine and clinopyroxene in an ankaramitic basalt from Mauna Kea, Hawaii. Data are presented for 37 compatible and incompatible trace elements, including Li, B and the REE from both suites. Detection limits are typically sub-ppm, with, for example, Tm present at 7 ppb in the Icelandic olivine and Lu at 120 ppb in the Hawaiian clinopyroxene. The calculated trace-element partition coefficients differ between the two suites. Partition coefficients for olivine ( D ol/matrix) for Li are 0.435 (Iceland) and 0.915 (Hawaii); for B are 0.559 (Iceland) and 0.984 (Hawaii). Other examples include D Sc ol/matrix 0.24–0.273 (Iceland) and 0.225 (Hawaii); whilst D's for Cr are 0.524–0.975 (Iceland) and 2.563 (Hawaii). D ol/matrix for REE are all greater for the Hawaiian ankaramite than for the Icelandic tholeiite. The partition coefficients calculated in this study generally fall within published ranges.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times