Measurements of trace elements in basalts and their phenocrysts by laser probe microanalysis inductively coupled plasma mass spectrometry (LPMA-ICP-MS)
Measurements of trace elements in basalts and their phenocrysts by laser probe microanalysis inductively coupled plasma mass spectrometry (LPMA-ICP-MS)
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DOI：
10.1016/0009-2541(94)00121-n
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发表时间：
1995-04
期刊：
影响因子：
3.9
通讯作者：
T. Jeffries;W. Perkins;N. Pearce
中科院分区：
文献类型：
--
作者：
T. Jeffries;W. Perkins;N. Pearce
本文用电感耦合等离子体质谱仪（ICP-MS）和改进的Nd：YAG激光器原位测定了橄榄石和单斜辉石中微量元素的分带和分配系数。激光器在Q开关模式下工作时产生直径为20-40 μm的烧蚀坑，可以提供矿物中微量元素的空间分析。ICP-MS根据合成微量元素玻璃参考材料进行校准，可用于快速测定低浓度（亚ppm）的元素。分配系数：（1）橄榄石拉斑玄武岩玻璃从Stapafell，冰岛和（2）橄榄石和单斜辉石的黑云母玄武岩从莫纳克亚，夏威夷。数据为37兼容和不兼容的微量元素，包括Li，B和稀土元素从两个套房。检测极限通常低于ppm，例如，冰岛橄榄石中的Tm为7 ppb，夏威夷单斜辉石中的Lu为120 ppb。计算出的微量元素分配系数不同的两套。橄榄石的分配系数（Dol/基质）：Li为0.435（冰岛）和0.915（夏威夷）; B为0.559（冰岛）和0.984（夏威夷）。其他例子包括DScol/matrix 0.24 -0.273（冰岛）和0.225（夏威夷）;而Cr的D为0.524-0.975（冰岛）和2.563（夏威夷）。稀土元素的Dol/Matrix值，夏威夷黑云母均大于冰岛拉斑玄武岩。本研究中计算的分配系数通常在公布的范围内。
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 (Dol/matrix) for Li are 0.435 (Iceland) and 0.915 (Hawaii); for B are 0.559 (Iceland) and 0.984 (Hawaii). Other examples include DScol/matrix0.24–0.273 (Iceland) and 0.225 (Hawaii); whilst D's for Cr are 0.524–0.975 (Iceland) and 2.563 (Hawaii). Dol/matrixfor 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.