麻山群孔兹岩系柱晶石特征及成因研究

文中所涉及的柱晶石产于我国黑龙江省东部麻山群变质沉积岩系中。作者对矿物的形态、物性、化学成分、结构特征及岩石矿物共生组合进行了系统研究,并与国外同类矿物的资料进行了对比。结合对麻山群变质地质的详细研究,本文还对柱晶石的成因及地质意义进行了探讨。

CHARACTERISTICS AND ORIGIN OF KORNERUPINE IN THE KHONDALITE SERIES OF THE MASHAN GROUP

Kornerupine was first discovered in the khondalite series of the Mashan Group in Northeast China. The associated minerals include cordierite, plagioclase, sillimanite, almandite, and small amounts of quartz, K-feldspar, lronrich tourrnaline, biotite, graphite and ilmenite. Kornerupine crystals occur as greyish-yellow prisms. Specific gravity=3.198, hardness=6.80. Main optical properties are: pleochroism Np=Nm colorless, Ng pale brownishyellow, refractive indices Ng=1.6944, Nm=1.6933, Np=1.6800, and biaxial negative with 2V=36.AEM, EDS, EPMA, IR spectra and X-ray powder analyses revealed the chemical composition and crystal structure of the kornerupine, and a comparison has been made between the present data and those reported in the literature. In conjunction with detailed geological research, the origin of kornerupine and its geological significance are also discussed in this paper.