斜方辉石的光性及红外光谱研究

STUDIES ON THE OPTICAL CHARACTER AND INFRARED SPECTRUM OF ORTHOPYROXENE

根据51个斜方辉石的化学成分和红外光谱资料,确定吸收带660-700cm^(-1)的波数(γ)与含镁量(X_(Mg))为线性正相关,线性方程为X_(Mg)=-1595.6-2.44γ,γ=0.92。将斜方辉石的γ、2v、红外光谱波数与成分的相关线绘于一个图上,则此图可以快速地鉴定斜方辉石及估测X_(Mg)值。

The available coordination diagrams of refraction index, optical angle and chemical composition of oethopyroxene are reviewed in this paper. On the basis of chemical and infrared spectrum data of 54 orthopyroxenes, the regressive equation and correlation line between 660-700cm~' infrared wavenumber (I. S. ) and magnesium content XM8 = 100×(Mg/Mg + Fe2+ + Fe3+ + Mn) of orthopyroxene are obtained.The diagram plotting with Y, 2v and regressive correlation line of orthopyroxene makes the detailing of nomenclature and estimation of XMg value of orthopyroxene more easy and rapid. Examination shows that the deviation of average XMg value, which is derived from Y, 2v and infrared spectrum, is usually within 0-4.