Characteristics of Ore-Forming Fluid

Characteristics of Ore-Forming Fluids of Gold Deposits in Daqingshan District, Inner Mongolia, China

Located in the mid-west of Inner Mongolia, Daqingshan district has many gold deposits occurring along a east-west striking ductile shear zone within a greenstone belt, which is mainly composed of the Archean Wulashan group. The hydrothermal mineralization can be divided into four stages: (1) pyrite-quartz, (2) quartz-pyrite, (3) polymetallic sulfides and (4) carbonates-quartz. The major metallic minerals in the ore of gold-bearing veins are native gold, electrum, pyrite, chalcopyrite and galena, but the gangue minerals are mainly quartz, secondarily sericite, ankerite and calcite. Principal alteration patterns in the gold deposits are sericitization, silicification, pyritization, carbonatization and chloritization. An investigation on fluid inclusions shows that the ore-forming fluids were low in salinities and high in CO2 content. Measured of fluid inclusions in quartz from the ore veins ranges from-65 ‰ to-104 ‰, but from 10.0‰ to 12.8‰. These data show that the water in hydrothermal fluid precipitating the ore bodies could have been mainly magmatic water and metamorphic water, but local meteoric water might take part in the late mineralization. from fluid inclusions in the ore varys from-3.3 ‰ to-6.2 ‰, indicating that carbon was derived from magmatic or anatectic source. from sulfide samples in gold deposits ranges from -4.1‰ to +4.0 ‰, which are identical with that from Shi, et al.. It is concluded that the gold deposits in Daqingshan district are similar to those in Xiaoqinling area, in aspects of geological characteristics, mineral association and stable isotope composition.

作 者： Jiuhua Xu Yuling Xie Dayi Qian Rufu Ding Jianping Li   作者单位： Jiuhua Xu,Dayi Qian,Jianping Li(Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, China)

Yuling Xie(Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, China;China University of Geosciences, Beijing 100083, China)

Rufu Ding(China University of Geosciences, Beijing 100083, China) 

刊 名： 北京科技大学学报（英文版）  EI SCI 英文刊名： JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING  年，卷(期)： 1999 6(2)  分类号： P5  关键词： fluid inclusions   isotope composition   gold deposit   Daqingshan area  

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