| Origin of fluids in the Hetaoping Pb-Zn deposit, Baoshan-Narong-Dongzhi block metallogenic belt, Yunnan Province, SW China | |
| Yang Yulong; Ye Lin; Cheng Zengtao; Bao Tan | |
| Corresponding Author | Ye Lin |
| 2013 | |
| Source Publication | Journal of Asian Earth Sciences
 |
| Volume | 73Issue:5Pages:362-371 |
| Abstract | The Hetaoping skarn type Pb-Zn deposit is located in the Baoshan-Narong-Dongzhi block metallogenic belt (BND belt), a belt between the Tengchong terrane and the Lanping basin. The deposit is hosted by marble of the upper Cambrian Hetaoping Formation and there are no outcrops of plutonic rocks present. This deposit is one of two large Pb-Zn deposits recently discovered in the BND belt. The Hetaoping deposit is a high Mn skarn. Four types of fluid inclusions were recognized in quartz from the deposit: vapor-rich inclusions (Type I), liquid-rich inclusions (Type II), pure vapor inclusions (Type III), and pure fluid inclusions (Type IV). The coexistence of Type I and Type III inclusions in Stage I (pre-ore stage) and Stage II (main ore stage) shows evidence of fluid boiling. Quartz-hosted fluid inclusions (Stage land Stage II) display high homogenization temperatures and salinities (134-315 degrees C; 3.7-18.6 wt% NaCl equivalent) but calcite-hosted fluid inclusions in Stage III (post-ore stage) record lower homogenization temperatures and salinities (85-214 degrees C; 0.5-5.4 wt% NaCl equivalent). These data suggest a possible mixing between primary magmatic water and meteoric water. Based on chromatography data, the fluid inclusions in quartz contain abundant CO2 and O-2 and subordinate CO, CH4 and C2H2 + C2H4, suggesting an oxidizing environment. Based on their Na/K and Cl/SO4 ratios, fluids contained in fluid inclusions are similar to volcanic spring waters. The low Na/K ratios (0.40-1.34) of the ore-forming fluids may have resulted from interaction with a deep alkaline intermediate-acid intrusion. Hydrogen and oxygen isotope determinations on quartz from different ore stages show low delta O-18 and delta D values relative to VSMOW (-4.3 parts per thousand to 2.3 parts per thousand; -109 parts per thousand to -91 parts per thousand), indicating that the ore-forming fluids were diluted by external fluid sources as the skam system cooled. Overall, geological and geochemical interpretations suggest that the Hetaoping deposit is a distal manganese skarn Pb-Zn deposit related to concealed intrusions. |
| Keyword | Baoshan–narong–dongzhi Block Metallogenic Belt Fluid Inclusion Ore-forming Fluid Concealed Intrusion |
| Subject Area | 矿床地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5035 |
| Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 |
| Corresponding Author | Ye Lin |
| Recommended Citation GB/T 7714 | Yang Yulong,Ye Lin,Cheng Zengtao,et al. Origin of fluids in the Hetaoping Pb-Zn deposit, Baoshan-Narong-Dongzhi block metallogenic belt, Yunnan Province, SW China[J]. Journal of Asian Earth Sciences,2013,73(5):362-371. |
| APA | Yang Yulong,Ye Lin,Cheng Zengtao,&Bao Tan.(2013).Origin of fluids in the Hetaoping Pb-Zn deposit, Baoshan-Narong-Dongzhi block metallogenic belt, Yunnan Province, SW China.Journal of Asian Earth Sciences,73(5),362-371. |
| MLA | Yang Yulong,et al."Origin of fluids in the Hetaoping Pb-Zn deposit, Baoshan-Narong-Dongzhi block metallogenic belt, Yunnan Province, SW China".Journal of Asian Earth Sciences 73.5(2013):362-371. |
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