关键词: 大兴安岭南段, 热液脉状矿床, 流体包裹体, 稳定同位素, 成矿作用

Abstract: Several hydrothermal vein-type deposits, including Dajing Sn-Cu poly-metallic deposit, Shuangjianzishan Ag polymetallic
deposit, Bujinhei Pb-Zn deposit, Bairendaba Ag-Pb-Zn deposit and Weilasituo Sn-Cu polymetallic deposit, were developed in the
southern Great Xing’an Range. In order to further understand the characteristics and differences of the ore-forming fluids and
ore-forming materials from the hydrothermal vein-type deposits in this area, we carried out studies of fluid inclusions, Laser Roman,
and H-O-S isotopes on the basis of field geological investigations. The results show that:（1）Ore-forming fluids of Shuangjianshan
deposit belong to simple brine system, ore-forming fluids of Bujinhei and Weilasituo deposit belong to carbonaceous-rich brine system,and the initial ore forming fluids of Dajing deposit belong to daughter mineral bearing fluids, respectively;（2）Ore-forming fluids of
early stage from Dajin, Bujinhei, Bairendaba and Weilasituo deposit were mainly derived from magmatic fluids, while the fluids were
affected by meteoric water and organic matters.（3）The δ34S values of different hydrothermal vein-type deposits change around 0‰,
and show the characteristics of deep source magma. Different magmatic sources and the involvement of the strata sulfur during
mineralization may be the main cause for the differences of sulfur isotope composition among deposits. Generally, there exist obvious
differences in terms of material sources and fluid evolution among different hydrothermal vein deposits in southern Great Xing’an
Range, which reflects the diversity and complexity of the Mesozoic hydrothermal mineralization in-this area.

Key words: Southern Great Xing’an Range, hydrothermal vein-type deposits, fluid inclusions, stable isotope, metallogenesis