论岩浆成因的黄玉单矿物岩

业已在自然界发现中深成相，超浅成相和良好封闭相的岩浆成因黄玉单矿物岩，拥有宏观，微观岩浆成因标志，得到有关富挥发分酸性岩体成岩，成矿实验成果的有力佐证，属一类新的岩浆岩。这类岩石的分类实践表明，它们宜归入岩浆成的云英岩类范畴。有理由预见，自然界存在有黄玉单矿物岩的火山类似物，尚待发现与研究。

ON THE MAGMATIC MONOMINERALIC TOPAZ ROCK

There is conclusive mascroscopic and microscopic evidence for the occurrence of monominer-alic topaz rock of magmatic origin in plutonic, subvolcanic, and well-closed facies in nature. Experimental study on the system granite-H2O-RF(R = Li, Na, K, Rb, Cs and H+ ) indicates that monomineralic topaz rock can crystallize from an F-rich magma. Evidently, the rock should be regarded as a new igneous rock. Classification of magmatic monomineralic topaz rock shows that it is advisable to classify it as the category of magmatic greisen. There is every reason to predict that there exist its volcanic analogue in nature, which remains to be discovered and studied. The petrogenetic and metallogenetic model of magmatic monomineralic topaz rock does not negate the development of topazization in rocks. It is not advisable to misuse alteration indiscriminately and exaggerate its ubiquity and importance to petrogenesis and metallogenesis.