新疆黄山镁铁-超镁铁岩带锆石Hf同位素特征及源区性质探讨
Zircon Hf Isotope Characteristics and Source of Mafic-ultramafic Intrusions in Huangshan Region, Xinjiang
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摘要: 黄山东、香山及土墩岩体均为多阶段侵入的杂岩体，岩体与围岩为侵入接触关系，显示热侵位特征。岩石组成单元主要为超镁铁质橄榄岩和镁铁质辉长岩。岩石化学组成以拉斑玄武岩系列为主，存在部分钙碱性系列和碱性系列。稀土元素具平坦的分配型式或轻稀土略富集的分配型式。锆石Hf同位素指示岩石来源于亏损型地幔源区。黄山东、香山及土墩镁铁-超镁铁岩不是俯冲洋壳的残余或者岛弧环境的阿拉斯加型岩体，而是来源于亏损型地幔源区的岩浆底侵形成。Abstract: Huangshandong, Xiangshan and Tudun plutons are multiple-phase intrusive complexs, which show clear intrusive contact boundaries with wall rock. These intrusions are mainly composed of peridotite and gabbro. Peridotite has orthopyroxene or plagioclase, while clinopyroxene is augite or diopside. The Huangshandong, Xiangshan and Tudun plutons are mainly tholeiitic in composition, and some of them show calc-alkaline and alkaline characteristics. Chondrite-normalized rare earth element patterns show flat feature or slight enrichment in LREE. Zircon Hf isotopic compositions indicate that the Huangshandong, Xiangshan and Tudun intrusive complexes are derived from the depleted mantle source.Huangshandong, Xiangshan and Tudun plutons are not the remnants of subducted oceanic crust or Alaska-type rocks, but they are formed by the underplating of depleted mantle source.
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Key words:
- mafic-ultramafic rocks /
- zircon /
- Hf isotope /
- source characteristics /
- eastern Tianshan
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