期刊
MINERALIUM DEPOSITA
卷 53, 期 6, 页码 855-870出版社
SPRINGER
DOI: 10.1007/s00126-017-0787-8
关键词
Ce4(+/)Ce(3+); Zircon; Apatite; Skarn deposits; Porphyry deposits; East Kunlun
资金
- Geological Survey Program of the China Geological Survey [1212011085528]
- Program of High-level Geological Talents [201309]
- Youth Geological Talents of the China Geological Survey [201112]
- IUGS-UNESCO [IGCP-592]
- EU Horizon 2020 project FAME [641650]
- Chinese Scholarship Council
The Weibao copper-lead-zinc skarn deposit is located in the northern East Kunlun terrane, NW China. Igneous intrusions in this deposit consist of barren diorite porphyry (U-Pb zircon age of 232.0 +/- 2.0 Ma) and ore-bearing quartz diorite and pyroxene diorite (U-Pb zircon ages of 223.3 +/- 1.5 and 224.6 +/- 2.9 Ma, respectively). Whole-rock major and trace element and accessory mineral (zircon and apatite) composition from these intrusions are studied to examine the different geochemical characteristics of ore-bearing and barren intrusions. Compared to the barren diorite porphyry, the ore-bearing intrusions have higher Ce4+/Ce3+ ratios of zircon and lower Mn contents of apatite, indicating higher oxidation state. Besides, apatite from the ore-bearing intrusions shows higher Cl contents and lower F/Cl ratios. These characteristics collectively suggest the higher productivity of ore-bearing quartz diorite and pyroxene diorite. When compared with ore-bearing intrusions from global porphyry Cu deposits, those from Cu-Pb-Zn skarn deposits display lower Ce4+/Ce3+ and Eu-N/Eu-N* ratios of zircon and lower Cl and higher F/Cl ratios of apatite. We conclude that these differences reflect a general geochemical feature, and that zircon and apatite composition is a sensitive tool to infer economic potential of magmas and the resulting mineralization types in intrusion-related exploration targets.
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