MEASUREMENTS OF TRACE-ELEMENTS IN BASALTS AND THEIR PHENOCRYSTS BY LASER PROBE MICROANALYSIS INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY (LPMA-ICP-MS)

被引：56

作者：

JEFFRIES, TE

PERKINS, WT

PEARCE, NJG

机构：

[1] Institute of Earth Studies, University of Wales, Aberystwyth

来源：

CHEMICAL GEOLOGY | 1995年 / 121卷 / 1-4期

关键词：

D O I：

10.1016/0009-2541(94)00121-N

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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-mu m 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.

引用

页码：131 / 144

页数：14

共 41 条

[31]

Perkins, Pearce, Mineral microanalysis by laserprobe inductively coupled plasma mass spectrometry, Microanalytical Techniques in the Geosciences, pp. 291-325, (1995)

[32]

Perkins, Fuge, Pearce, Quantitative analysis of trace elements in carbonates using laser ablation inductively coupled plasma mass spectrometry, J. Anal. At. Spectrosc., 6, pp. 445-449, (1991)

[33]

Perkins, Pearce, Jeffries, Laser ablation inductively coupled plasma mass spectrometry: A new technique for the determination of trace and ultratrace elements in silicates, Geochim. Cosmochim. Acta, 57, pp. 475-482, (1993)

[34]

Philpotts, Schnetzler, Phenocryst-matrix partition coefficients for K, Rb, Sr and Ba with applications to anorthosite and basalt genesis, Geochim. Cosmochim. Acta, 34, pp. 307-322, (1970)

[35]

Potts, A Handbook of Silicate Rock Analysis, (1987)

[36]

Reed, Ion microprobe analysis - a review of geological applications, Mineralogical Magazine, 53, pp. 3-24, (1989)

[37]

Reed, Recent developments in geochemical microanalysis, Microanalytical Methods in Mineralogy and Geochemistry, 83, pp. 1-9, (1990)

[38]

Roeder, Emslie, Olivine-liquid equilibrium, Contrib. Mineral. Petrol., 29, pp. 275-289, (1970)

[39]

Schnetzler, Philpotts, Partition coefficients of rare-earth elements and barium between igneous matrix material and rock-forming mineral phenocrysts, I, Origin and Distribution of the Elements, pp. 929-938, (1968)

[40]

Schnetzler, Philpotts, Partition coefficients of rare-earth elements between igneous matrix material and rock-forming mineral phenocrysts, II, Geochim. Cosmochim. Acta, 34, pp. 331-340, (1970)

← 1 2 3 4 5 →