Abstract:

The Yuerya gold deposit is located in the middle segment of north margin of the North China plate. It is a large gold deposit in Jinchangyu-Yuerya mineralization concentration area and hosted in granite body and its contact zone with strata of the Changcheng system in the Eastern Hebei Province. Systematic investigations on geologic characteristics, fluid inclusions, oxygen and hydrogen isotopes, sulfur and lead isotopes, trace element and rare earth elements, show that the ore-forming fluid has the feature of low salinities and medium-high temperature; the metallogenic material was derived from deep-source and mantle substances. Because gold mineralization is not probable for rare earth elements, the Bi element can be regarded as indicator for high-grade ore. Compared with Yuerya, the Jinchangyu gold deposit is hosted in metamorphic rock in this area. The metallogenic geological characteristics of south part of Niuxinshan gold deposit are similar to that of Jinchangyu, while that of north part of Niuxinshan similar to that of Yuerya. However, those deposits have the same ore-forming material source. These characteristics suggest that the specificities of metallogenic geological setting determine the specialties and complexities of apparent geological characteristics of gold deposits.

Key words: Yuerya gold deposit, red and white granite, fluid inclusion, geochemistry, metallogenic mechanism, eastern Hebei Province