| 江西永平铜多金属矿床流体包裹体及硫同位素研究 |
| |
| 关键词:fluid inclusion sulfur isotope porphyry-skarn deposit Yongping |
| 基金项目:国家自然基金项目(编号: 41373036; 41002027)；中央级公益性科研院所基本科研业务费专项资金项目(编号: K1101)；江西铜业股份有限公司合作项目 |
|
| 摘要点击次数: 2896 |
| 全文下载次数: 2207 |
| 摘要: |
| Fluid Inclusions and Sulfur Isotope of the Yongping Copper-polymetallic Deposit in Jiangxi Province |
| The Yongping copper-polymetallic deposit, located in the southern segment of Shi-Hang rift zone, is a porphyry-skarn type deposit related to the late Jurassic monzogranite intrusions. The mineralization at Yongping can be divided into two types: porphyry type and skarn type. Petrographic study of fluid inclusions suggests that three dominant types of fluid inclusions related to metallogensis are present in the porphyry Mo deposit: I-type gas-liquid inclusion, II-type CO2-bearing three-phase inclusion and III-type daughter-minerals bearing inclusion. Homogenization temperatures and salinities of fluid inclusions at the quartz-sulfide stage range from 202℃ to 359℃ and 4.62 wt%NaCl to 36.68 wt%NaCl. The quartz-carbonate-sulfide stage yielded homogenization temperatures of 211~318℃ and salinities of 2.07~11.47 wt%NaCl. Fluid inclusions in minerals of the skarn Cu deposit are mainly I-type gas-liquid inclusions. The homogenization temperatures and salinity of fluid inclusions at the skarn stage vary in the range of 406~486℃ and 9.21~9.89 wt%NaCl. The fluid inclusions of middle-stage have the homogenization temperatures of 137~335℃ and the salinity of 4.98~13.20 wt%NaCl. The late stage fluid has the homogenization temperatures of 89~151℃ and the salinity of 2.07~19.13 wt%NaCl. Raman microspectroscopic studies of the fluid inclusions of the skarn deposit and the porphyry deposit show that the main components are CO2 and H2O, and the ore-forming fluid belongs to the H2O-CO2-NaCl system. CH4 in the Mo fluid indicates condition of low oxygen fugacity. Therefore, Mo mineralization center is formed in the early stage of fluid evolution. Mo fluid has a higher temperature and pressure with respect to the Cu fluid at the quartz-sulfide stage. Most sulfur isotope values of the sulfides give a narrow δ34S range from –0.2‰ to +1.9‰, indicating a predominant magmatic sulfur origin. The authors hold that the Yongping copper-polymetallic deposit is a porphyry-skarn type deposit resulting from the emplacement of the Late Jurassic monzogranite intrusions. From the intrusion through the contact zone to the host rocks, the mineralization is demonstrated by zoning of Mo-Cu-W-Pb-Zn. |
| CHEN Jun-jun,CAO Dian-hua,CAO Dian-hua,QIU Chang-rong,WANG Xun-jun,KAN Ying-song.2016.Fluid Inclusions and Sulfur Isotope of the Yongping Copper-polymetallic Deposit in Jiangxi Province[J].Acta Geoscientica Sinica,37(2):163-173. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|