摘要
纳日贡玛铜钼矿床矿物中包裹体丰富、类型多样,有晶质熔体包裹体、流熔包裹体和流体包裹体三大类。其中,流体包裹体又分气体包裹体、液气包裹体、气液包裹体、含金属矿物或石盐子晶的气液包裹体。对流体包裹体的研究表明,该矿床是在较浅的地质环境中形成的,成矿温度主要为246℃～300℃,盐度最高为31.3wt%～42.2wt%NaCl,而且其矿体均产于高盐度包裹体分布的范围内,并且流体成份以Na+、Cl-和H2O为主。在含矿斑岩的石英中发现了流熔包裹体,这是一种岩浆～热液过渡性流体存在的直接证据,该证据说明了纳日贡玛铜钼矿床是花岗斑岩在演化过程中分异出来的,由岩浆热液形成。
Narigongma Cu-Mo deposit is hosted by granite-porphyry and there are rich inclusions in the vein type quartz and ore-bearing porphyry quartz. According to the composition and phase state, the inclusions can be classified into melt inclusion, fluid-melt inclusion and fluid inclusion. The fluid inclusion can be also divided into the gas phase inclusion, the fluid-gas inclusion, the gas-fluid inclusion and the halite-bearing inclusion. The research of fluid inclusion indicates that the deposit is formed in the shallow geological environment and the mineralize temperature is mainly 246 ℃ ~ 300 ℃; The most high salinity is 31.3 ~ 42.2wt%NaCl; The ore bodies occur in where is high salinity inclusion. Fluid composition primarily are Na+, Cl- and H2O.The fluid-melt inclusion found in the ore-bearing porphyry quartz is one kind of magma-hydrothermal transitional fluid and it shows that Narigongma Cu-Mo deposit is formed by magma solution that occurs in the process of the granite-porphyry evolvement.
出处
《物探化探计算技术》
CAS
CSCD
2007年第6期534-536,470-471,共3页
Computing Techniques For Geophysical and Geochemical Exploration
基金
中国地质调查局项目(资〔2003〕004-04)
关键词
青海纳日贡玛
斑岩型铜钼矿床
流熔包裹体
岩浆~热液过渡性流体
Qinghai province Narigongma
porphyry Cu-Mo deposit
fluid-melt inclusion
magma-hydrothermal transitional fluid
