Phenocryst-matrix partition coefficients for K, Rb, Sr and Ba, with applications to anorthosite and basalt genesis
Phenocryst-matrix partition coefficients for K, Rb, Sr and Ba, with applications to anorthosite and basalt genesis
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DOI：
10.1016/0016-7037(70)90108-0
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发表时间：
1970-03
影响因子：
5
通讯作者：
J. A. Philpotts;C. Schnetzler
中科院分区：
文献类型：
--
作者：
J. A. Philpotts;C. Schnetzler
用质谱稳定同位素稀释法测定了钾、铷、锶和钡在斜长石、钾长石、单斜辉石、斜方辉石、云母、角闪石、石榴石和橄榄石斑晶及其火成岩基质物质之间的分配系数。通过分离结晶的玄武岩的典型分化结果在较高的K，Ba和Rb浓度，略高的K/Sr，Ba/Sr和Rb/Sr比，和略低的K/Rb和Ba/Rb比在液体中。K/Ba可能是一个有用的太阳系索引标准。中长-拉长斜长岩的高K/Rb比值和其它微量元素特征反映了其成因为斜长石堆晶岩。分配系数已被应用到一个简单的玄武岩成因模型。
Partition coefficients for K, Rb, Sr, and Ba distributed between plagioclase, K-feldspar, clinopyroxene, orthopyroxene, mica, hornblende, garnet, and olivine phenocrysts and their igneous matrix materials, have been determined by a mass-spectrometric stable isotope dilution technique. Typical differentiation of a basalt through fractional crystallization results in higher K, Ba, and Rb concentrations, slightly higher K/Sr, Ba/Sr and Rb/Sr ratios, and slightly lower K/Rb and Ba/Rb ratios in the liquid. K/Ba may be a useful solar-system indexing criterion. The high K/Rb ratio and other trace element characteristics of andesine-labradorite anorthosites reflect their origin as plagioclase cumulates. Partition coefficients have been applied to a simple model of basalt genesis.