摘要
安家营子金矿床是华北地台内的一个中型矿床，产在燕山期的斑状花岗岩之中。通过对安家营子金矿床流体包裹体的研究，讨论了该矿床形成时的物理化学条件。成矿流体的温度、盐度（ＮａＣｌ）分别为２８０～３３０℃和４．６％～１０．６％。成矿流体的氧逸度为２．７×１０￣（－３１）～３．２×１０￣（－３１）ｐａ，ｐＨ值为５．０～５．８。包裹体的化学分析表明，成矿流体为Ｎａ￣＋－Ｋ￣＋－Ｃｌ￣－Ｈ＿２体系。
The Anjiayingzi gold deposit is a middle size deposit occurring in North China plateform,hosted by porphyritic granite with Yenshenian age.By the study of fluid inclusions of Anjiayingzi gold deposit,we have discussed the physicochemi-cal conditions when the gold deposit formed.The temperature and salinity of ore-forming fluid are 280～330℃ and 4.6%～10.6%NaCl respectively.The oxygen fugacity and pH value of ore-forming fluid are 2. 7×10￣(-31)～3. 2×10￣(-31)pa and 5.0～5.8 respectively.The chemical analysis of fluid inclusion suggests that the ore-forming fluids belong to the Na￣+-Ca￣(2+)-Cl￣--H_2O system with abundant carbon dioxide.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1994年第4期446-452,共7页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金
关键词
金矿床
成矿流体
物理化学条件
Anjiayingzi gold deposit
fluid inclusions
physicochemical conditions
