火山玻璃的拉曼光谱研究

THE RAMAN SPECTRUM STUDY ON VOLCANIC GLASS

本文分析了浙、闽、赣地区产于玄武岩、安山岩、流纹岩、黑曜岩及珍珠岩中玻璃相的拉曼光谱特征,认为酸性火山岩中的玻璃相分子团结构基本上由类似于结晶学上的、但在三维方向完全无序的链状、层状、架状及纯架状网络体组成,而中基性火山岩中的玻璃相结构仅由前三者组成。玻璃相分子团结构与其断健程度(DBB)间受一维延长的链状网络体(Ch)的含量正向控制及三维扩展的纯架状网络体(Ne~*)的含量负向控制,一元回归线性方程、相关系数R、拟合度F,分别是: 经研究,其中的黑曜岩可能是岩浆喷发间歇后的另一次爆溢产物。

In the paper, the Raman spectrum characteristics of glass phase in basalt, andesite, rhyolite, obsidian and pcarlite from Zhejiang, Fujian and Jiangxi provinces are discussed. The structure of molecular groups in glass phase from acid volcanic rocks are mostly com- posed of chain, sheet, framework and pure framework networks which are similar with the crystallographical structure but complete disorder in three-dimensions. Those from mid-basic volcanic rocks are composed of chain, sheet and framework networks. The relation between the structure of molecular groups and the degree of bond-breaking (DBB) in glass phase are positively controlled by the contents of chain network (Ch) with one-dimension exfension, and are negatively controlled by the contents of pure framework network (Ne ° ) with three-dimension exfension. The linear regression equations, coefficients of correlation (R) and degrees of fitting (F) are respectively as follows: DBB (%) = 0.373 · Ch(%)+12.628, RCh = 0.90, Fch = 80.3%; DBB (%) = -0.340 · Ne ?(%)+24.089, RNe- =-0.91, FNe. =82.3%. As a result of study, the obsidian may possibly be another product of effusive explosive eruption after magma eruption interval.