华北地台北缘及北邻地区铜、铅、锌、锡矿床流体包裹体研究

FLUID INCLUSION STUDIES OF COPPER,LEAD,ZINC AND TIN DEPOSITS IN NORTHERN MARGIN OF NORTH CHINA PLATFORM AND ITS NORTHERN ADJACENT AREAS

在对华北地台北缘及北邻地区 5 2个铜、铅、锌、锡矿床流体包裹体研究的基础上 ,概括总结出岩控型、层控型和混控型三大类型及多个亚类型矿床的主要成矿物理化学条件 ,建立了各类型矿床矿物流体包裹体成矿模式 ,并用以找矿。

Based on fluid inclusion studies of quartz from 52 copper, lead, zinc and tin deposits hosted in an area of 170 km 2 on the northern margin of North China platform and its northern adjacent fold system, the authors have divided these deposits into three subtypes, namely,intrusion bound type, strata bound type and complex bound type, which in turn can be further divided into several subtypes.\;The intrusion bound deposits are genetically related to magmatism. In deposits within or near intrusions, daughter minerals are abundant in the fluid inclusions, and gaseous incluions account for a considerable percentage. With the increasing distance from the intrusion, the homogenization temperature and salinity decrease, and the temperature, salinity, density, pH, Eh and f O 2 values show regular variation. The metallogenic fluids are derived from mixed magmatic water and meteoric water. The F - and Cl - contents are relatively high. The strata bound deposits are mainly controlled by strata. With the intensification of reformation, lenticular orebodies or vein orebodies were formed. According to sedimentary types and reformation characteristics, the strata bound deposits are further divided into five subtypes which show obvious differences in concentration, size, type, gas liquid ratio and chemical composition of fluid inclusions. The complex bound deposits are controlled not only by strata but also by intrusions. The reformation process is divided into magmatic hydrothermal reformation, volcanic hydrothermal reformation and magmatic thermal reformation. Different reformation intensities result in differences in size, concentration, type and chemical composition of fluid inclusions.