Geochemical characteristics of the Jinjiazhuang ultrabasic Roch-Type Gold Deposit in chicheng County, Hebei Province

摘要

The Jinjiazhuang gold deposit occurs in the zhangjiakou gold field, Northwest Hebei. The ore bodies are mostly hosted in Xiaozhangjiakou ultraasic rocks dominated by Diopsidite. Electron microprobe analyses indicate that the deposit is characterized by the enrich- Ment of some platinum group elements in principal metallic minerals such as chalcopyrite, gale- Na, sphalerite and pyrite, and the presence of millerite. Stable isotope studies show that car- Bon, sulfur and most of the metallogenic elements were probably derived largely from the host Xiaozhangjiakou ultrabasic rocks and that it is possible that the ore-forming fluid was predomi- Nated by meteoric water.