黑龙江省砂宝斯金矿床成矿条件及成因探讨

Abstract

Abstract:

The Shabaosi gold deposit inMohe County, Heilongjiang Province, is a large gold deposit. It occurred in the Middle Jurassic continental clastic rock. There are six ore veinswith nearly SN trend in the deposit. The ore bodies are strictly controlled by SN and NNW trend fault and the surrounding rocks and the intrusive rocks are involved in the mineralization. From the study of fluid inclusions, it is concluded that the ore2forming fluid belongs to Ca2 + ( K+ 、Na+ ) 2SO22 4 ( F2、Cl2 ) type,which is characterized by the low salinity (0. 8% ～9. 2% ) , low density (0. 895g/ cm3 ) , alkali (pH: 8. 05～8. 26) , high sulfide, low oxidize (Logfo2 : 239. 4 ～239. 2) and relative reducing environment ( Eh:- 0. 71～ - 0. 68 ). The ore2forming temperature ranges from 200 ～230℃, with p ressure of 40MPa and dep th of 1. 33km. Based on the analysis of Pb, S, C, H and O isotopes and the study ofmicroelements of the gold deposit, it is found that the ore2forming elements are from magma and strata in dep th. The ore2forming fluids are mainly derived from magma in dep th,with a little atmospheric water. The geological and geochemical characteristics of the Shabaosi gold deposit are similar to those of low sulphidation ep ithermal gold deposits in the world, and it belongs to low sulphidation ep ithermal gold deposit.

Key words: Shabaosi gold deposit, Geological characteristics, Ore2forming condition, Ore genesis, Heilongjiang

CLC Number:

P618. 51

ZHAO Chunrong,WANG Xiaoyong , HU Qinxia , CHEN Man ,L IU Hongli. Ore2form ing Conditions and Genesis of the Shabaosi Gold Deposit , He ilongjiang Prov ince[J].J4, 2008, 16(6): 22-26.

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Ore2form ing Conditions and Genesis of the Shabaosi Gold Deposit , He ilongjiang Prov ince

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