| 新疆哈密白石泉含铜镍镁铁-超镁铁质岩体铂族元素特征 |
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| 关键词:platinum group elements mafic-ultramafic intrusives Baishiquan Hami Xinjiang |
| 基金项目:国家自然科学基金项目(编号:40402012); 国家305项目(编号:2001BA609A0702) |
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| Platinum Group Elements Geochemistry of Baishiquan Mafic-Ultramafic Intrusives in Central Tianshan Block, Xinjiang |
| Peridotite, pyroxenite, hornblendite, troctolite and gabbro in Baishiquan intrusion were chosen for platinum-group elements analysis. The results show that their total PGE contents are low, and their primitive mantle-normalized PGE patterns are similar to those of mafic rocks in other areas with positive Pt anomalies and from PGE nonfractionation (Pd/Ir=1.35～5.36) to mild fractionation (Pd/Ir=12～81.54), mainly affected by crystallization differentiation. The Cu/Pd, Ti/Pd and Se/S ratios of these rocks suggest that segregation of sulfide melt must have occurred. The fractionation of olivine and chromite triggered the immiscibility of the sulfide melt from the silicate-melt. The intrusions were generated from the magma that had undergone crystallization differentiation of olivine and segregation of sulfides. |
| CHAI Feng-mei,ZHANG Zhao-chong,MAO Jing-wen,DONG Lian-hui,YE Hui-shou,WU Hua,MO Xin-hua.2006.Platinum Group Elements Geochemistry of Baishiquan Mafic-Ultramafic Intrusives in Central Tianshan Block, Xinjiang[J].Acta Geoscientica Sinica,27(2):123-128. |
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