| 长埔锡矿床成矿流体性质与演化 |
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| 关键词:ore-forming fluids tin deposits Changpu |
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| The Characters and Evolution of Minerogenetic Fluids of Changpu Tin Deposits |
| The study of the fluid inclusions of Changpu tin deposits indicates that the minerals in the de-posits are rich in fluid inclusions. They include liquid inclusions ,gaseous inclusions , multi-phase in-clusions involving liquid CO2 , and multi-phase inclusions involving daughter minerals. The miner-alization can be divided into three stages : cassiterite-quartz-tourmaline stage , cassiterite-sulfidesstage ,and barren quartz stage,Fromearly stage to late one both the temperature and the salinityreveal a decreasing trend , but the overlapping phenomenon is obvious.In this area the minerogenet-ic temperature range is from 160℃to 410℃; the optimum temperature range is 220-340℃; thesalinity range is 2-16WNaCl%. The mineralization pressure is 30-45 MPa , which coresponds tominerogenetic depth of 1.2-1.8km. The mineralization thermal liquids came mainly from magmafluids , and at the late stage they were influenced by meteoric water. The boiling temperature of thefluids may be 269.2℃; the pressure :12.5Mpa; the depth :0.5km. |
| 马秀娟.1995.The Characters and Evolution of Minerogenetic Fluids of Changpu Tin Deposits[J].Acta Geoscientica Sinica,16(4):386-396. |
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