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- Title
大兴安岭北段八分场银矿床的发现及其成矿流体特征.
- Authors
乌日根; 庄倩; 张爽; 李新鹏; 邓昌州
- Abstract
The Duobaoshan area, located in the northern part of the Great Xing’an Range, is an important Cu-Mo-Au metallogenic area. The discoveries of the Erdaokan and Bafenchang silver deposits in recent years indicate that there is a great prospecting potential for silver in this area. Most of the studies have been focused on Cu-Mo-Au, whereas the knowledge of silver deposits is not in depth. The newly discovered Bafenchang silver deposit provides an opportunity to study the silver mineralization in this area. Based on the detailed geological characteristics, we have studied the fluid characteristics of the Bafenchang silver deposit. A detailed comparison with the Erdaokan silver deposit has also been conducted to provide reference for regional ore prospecting and improving metallogenic theory. The ore bodies of Bafenchang silver deposit are hosted in structural breccia in the form of veins, which are controlled by the NNE-trending faults. The formation of the deposit was mainly involved in the following four stages: quartz-magnetite stage, quartz-pyrite stage, quartz-silver-polymetallic sulfide stage and carbonate-quartz-less sulfide stage. The study of fluid inclusions in quartz from the main ore-forming stage shows that the fluid inclusions are mainly gas-liquid two-phase inclusions. The peak homogenization temperature of the inclusions varies from 190 ℃ to 220 ℃, the salinity ranges from 1.9% to 4.1% NaCleqv, and the density varies from 0.82 g/cm3 to 0.92 g/cm3. The metallogenic pressure of the ore-forming fluid is at the range of 9.9 and 22.6 MPa, and the estimated metallogenic depth is 1.0~2.3 km. The variation range of fluid δ18O is 1.3‰~1.9‰, and δD is -110.8‰~-89.1‰. In general, the ore-forming fluid has shown medium-low temperature, low salinity, low density as well as low pressure, with similarity to the newly discovered Erdaokan silver deposit in the region. The ore-forming fluids should be sourced from a mixture of magmatic water and atmospheric water for both Bafenchang and Erdaokan. The difference is that the ore-forming fluids from the Bafenchang silver deposit are primarily composed of magmatic water and have been formed at a greater depth. It is inferred that the Duobaoshan area has a great silver metallogenic potential, which could be exemplified by silver mineralization occuring both in the shallow surface (represented by Erdaokan silver deposit) and in deeper depth (represented by Bafenchang silver deposit).
- Publication
Geology & Exploration, 2023, Vol 59, Issue 1, p12
- ISSN
0495-5331
- Publication type
Article
- DOI
10.12134/j.dzykt.2023.01.002