Abstract:

 Xuyaogou gold deposit is located in Erlangping Group stratum and controlled by ruptures of Zhuyangguan Xiaguan and Waxuezi Qiaoduan in east Qinling orogenic belt. The orebody is mainly located in the contact zone of Muhuding granite and Huoshenmiao Formation stratum. Gold ore can be divided into two type including quartz vein and alteration. Wall rock develop many types of alteration,such as silicification,sericitic alteration,chloritic alteration,potassic alteration,carbonatic alteration,pyrite and hematite alteration. The fluid inclusions in ore-bearing quartz vein mainly include gas rich and H₂O-NaCl-CO₂; homogenization temperature  are from 310 to 350 ℃, and salinity is from 2% to 7% in ore-forming period; homogenization temperature are from 300 to 340 ℃, and salinity is from 10% to 15% in late ore forming period. The ore-forming process of Xuyaogou gold deposit is very complicated,and boiling and mixing of meteoric water and igneous water occures in the ore forming period. Through comprehensive analysis,Xuyaogou gold deposit is a tectonic fragmentized belt type of gold deposit.

Key words:  Neixiang County,Henan Province, Xuyaogou gold deposit, geological characteristics, fluid inclusion, oreforming mode