| 吉林红旗岭富家矿床矿石矿物化学和硫同位素特征——对铜镍硫化物矿床成因及成矿过程的约束 |
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| 关键词:mineral chemistry sulfur isotope ore genesis ore-forming process magmatic Ni-Cu sulfide deposit Hongqiling |
| 基金项目:财政部项目“地质遗迹标本采集、购置与综合研究”(编号: 121113000000160034-11) |
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| Mineral Chemistry and Sulfur Isotopic Characteristics of Ores from the Fujia Deposit in Hongqiling Area, Jilin Province: Constraints on the Genesis and Ore-forming Processes of Ni-Cu Sulfide Deposit |
| Systematic studies of mineral chemistry and sulfur isotope of the ore minerals were carried out at the Fujia deposit in Hongqiling area, Jilin Province. Coexisting ore minerals mainly consist of pyrrhotite (Po), pentlandite (Pn), chalcopyrite (Cp) and pyrite (Py). The pyrrhotite includes monoclinic pyrrhotite (Mpo), hexagonal pyrrhotite (Hpo) and troilite (Tr), with the Mpo (a low temperature polymorphism) being dominant. The pentlandite evolved from Pn(1) via Pn(2) to Pn(3), whereas the pyrite varied in the sequence of Py(1)→Py(2)→Py(3)→Py(4) at the same mineralization stage. The pyrite-pyrrhotite mineral thermometry shows that the mineralizing temperatures of the ore minerals vary between 500°C and 300°C, while the mineralizing sequence is approximately Pn→Po→Cp→Py. Sulfur isotopic characteristics show that the variation of δ34S values is relatively small (from –4.70‰ to +2.40‰), and statistics of the values fit tower-style distribution between –2.5‰ and +2.5‰, which indicates that sulfur of metal sources of this deposit was derived from the mantle with only a slight crustal contamination. In addition, the δ34S values show δ34SPo>δ34Ssulfide>δ34Spy, indicating that sulfur reached equilibrium in ore-forming melt. In combination with characteristics of the orebodies in the field and ore fabric, the authors hold that the ore-forming materials were principally derived from the upper mantle. Magmatic liquation was the major mineralization process, combined with obvious magmatic hydrothermal superimposition. The deposit is conduit-type mineralization, which can be explained by intrusion of deep ore-bearing magma and magma liquation-conduit-style mineralization. |
| LÜ Lin-su,LI Hong-bo,ZHOU Zhen-hua,XU Li-guo,YANG Xiao-nan,MAO Bing.2017.Mineral Chemistry and Sulfur Isotopic Characteristics of Ores from the Fujia Deposit in Hongqiling Area, Jilin Province: Constraints on the Genesis and Ore-forming Processes of Ni-Cu Sulfide Deposit[J].Acta Geoscientica Sinica,38(2):193-207. |
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