Raman discrimination of garnet inclusions in Siberian diamonds

被引：5
|
作者：
Kalugina, A. D. [1 ]
Zedgenizov, D. A. [1 ,2 ]
机构：
[1] Novosibirsk State Univ, 1 Pirogova St, Novosibirsk 630090, Russia
[2] VS Sobolev Inst Geol & Mineral, Novosibirsk, Russia
来源：
JOURNAL OF RAMAN SPECTROSCOPY | 2020年 / 51卷 / 09期
基金：
俄罗斯科学基金会;
关键词：
diamond; eclogite; garnet; mantle; peridotite; HIGH-PRESSURE; MICROSPECTROMETRY; SPECTROSCOPY; GEOBAROMETRY; X3Y2Z3O12; GEOMETRY; SPECTRA; SYSTEMS; PYROPE;
D O I：
10.1002/jrs.5713
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
The composition of garnet inclusions in natural garnets is exceptionally useful for identification of the chemical and physical properties of mantle lithologies in which they occur. The results of Raman study of garnet inclusions in Siberian diamonds are presented. Most of studied garnets belong to either peridotitic (P type, n = 101) or eclogitic (E type, n = 63), and some rare garnets are websteritic (n = 5). Detected spectroscopic features of garnets in diamonds reveal a wide wave number ranges for rotational R[SiO4], bending nu(2), and stretching nu(1) modes. The peak positions of the Raman bands correlate with content of major components of garnets. Raman shift of stretching nu(1) and bending nu(2) vibrations reflects Ca-Mg and Al-Cr isomorphism. The found correlations have been applied for rough estimation of the garnet compositions. This method allows to discriminate E-type and P-type garnets marking diamondiferous mantle rocks.
引用
收藏
页码：1438 / 1444
页数：7
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