SHI Cheng-long1, SONG Yang2, HU Jian-zhong1, ZHAO bo1, WANG Tao1, LIAO Yu-zhong1
1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
2. The Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
Abstract: The Huajian gold district is located in the large gold ore belt of northern Hebei, north margin of the north China Craton. The ore deposit is hosted in metamorphosed rocks and magma rocks, and faults are the main structural pattern in this area. Based on the geologic feature, we investigated isotope compositions of sulfur and lead in the paragenous pyrite, as well as the oxygen isotope composition of the paragenous quartz in fluid inclusions.We found that the δ34S value of pyrite in the main orebody ranges from 1.5‰ to 5.8‰, having characteristics of the crustal source magmatic rock. 206Pb/204Pb values range from 16.02 to 16.25, 207Pb/204Pb values range from 15.161 to 15.213, and 208Pb/204Pb values range from 35.953 to 36.12, all of these are consistent with the typical lead isotope characteristics of the lower crust. δ18OH2O values of fluid inclusions within the paragenous quartz range from 0.49‰ to 5.45‰, δ18OV- SMOW values range from 10.3‰ to 14.2‰, δD values range from-72.1‰ to-63.1‰, suggesting that ore fluids mainly came from magmatic hydrothermal fluids with participation of small amounts of atmospheric water. Our research indicated that the ore-forming materials mainly derived from Mesozic magmatic hydrothermal activities-the Niuxinshan Intrusive complex, and secondly derived from the metamorphosed Neoarchean (Zunhua Group) rocks-the surrounding rocks.
Keywords: quartz vein gold deposit stable isotope ore-forming fluid and materials sources Huajian gold deposit northern margin of North China Craton
*Corresponding Author, E-Mail: songyang100@126.com
Bulletin of Mineralogy, Petrology and Geochemistry Vol. 34, No.2, 2015, page 362-368
