Effects of compositional variation on absorption spectra of lunar pyroxenes
Effects of compositional variation on absorption spectra of lunar pyroxenes
复制标题
成分变化对月球辉石吸收光谱的影响
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
H. Mao
中科院分区：
文献类型：
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作者：
R. Hazen;P. M. Bell;H. Mao
偏振吸收光谱的月球辉石的范围内的铁，钙，镁，钛和铬的含量进行了测量抛光，定向单晶;纯合成FeSiO 3的光谱数据也被记录。在1和2微米的频带被发现显着变化的位置与组合物内的辉石四边形，增加钙和铁的波长增加。在可见光区，640 nm处的弱带与Cr2 O3的强度相关，但与钛无关，如先前所建议的。在大多数低钙辉石中，505 nm的亚铁峰是尖锐的双峰，但在辉石中是单峰。在475 nm处的峰和低于700 nm的强吸收边与钛含量相关。
Polarized absorption spectra of lunar pyroxenes with a range of iron, calcium, magnesium, titanium and chromium contents were measured on polished, oriented single crystals; spectral data on pure synthetic FeSiO3 were also recorded. The bands at 1 and 2 microns were found to vary significantly in position with composition within the pyroxene quadrilateral; wavelengths increased with increasing calcium and iron. In the visible region, a weak band at 640 nm correlates in intensity with Cr2O3, but not with titanium as had been previously suggested. The 505-nm ferrous iron peak is a sharp doublet in most low-calcium pyroxenes but a singlet in augites. A peak at 475 nm and an intense absorption edge below 700 nm correlated with titanium content.