MELT AND FLUID INCLUSIONS IN IGNEOUS ROCKS IN CENTRAL XIZANG (TIBET)

Through a study of the characteristics and composition of melt and fluid inclusions in volcanic rocks and their associated granites in the subduction zone of the Tibetan plate, it has been found that the characteristics of the inclusions in quite a few minerals of various rock types are closely related to the nature of molten magmas, thickness of strata and cooling speed. Therefore, their characteristics may be used to discriminate different lithofacies types. In this paper the evolution and crystallization of magmas are discussed on the basis of the glass composition of the inclusions measured using the electron probe, and the gas composition and its parameters are used in elucidating the physico-chemical conditions of rock and ore formation.     

西藏中部地区火成岩中熔体和流体包裹体的研究

本文通过对西藏板块俯冲带上火山岩及其伴生的花岗岩中熔体和流体包裹体特征和成分的研究,论述了各岩石类型多种矿物中包裹体的特点,是与熔浆性质,岩层厚薄以及冷却速度等有密切关系。因此,依据它的特性可用来判别不同岩相的类型。根据电子探针测定的包裹体的玻璃成分,探讨了岩浆的演化和结晶作用。并利用气体成分及其参数,阐明了成岩成矿的物理化学条件。