中国阿尔泰北部山区早泥盆世花岗岩的年龄、成因及构造意义
Ages and origin of the early Devonian granites from the north part of Chinese Altai Mountains and its tectonic implications
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摘要: 对阿尔泰北部山区喀纳斯及琼库尔花岗岩体进行锆石LA-ICPMS U-Pb定年分别获得398±5Ma(MSWD=2.3)和399±4Ma(MSWD=1.2)的生成年龄,确定其形成于早泥盆世。结合近期研究成果,进一步表明,阿尔泰造山带花岗岩主要形成于早一中古生代,峰期在400Ma左右。这两个花岗岩同阿尔泰其它400Ma左右的花岗岩具有相同或相似的野外产状、岩石学、地球化学特征和同位素组成,如高硅、富钾、铝,轻稀土富集,具有Eu负异常,富集大离子亲石元素(Rb、Ba、K),具有明显的Nb、Ta、Sr、P、Ti负异常,具有负的БNd(t)值(-1.5~-0.1)和相对于区内其它花岗岩较老的Nd同位素模式年龄tDM(1.15~1.35Ga),表明这些花岗岩具有钙碱性-高钾钙碱性特征,其物源源除了地幔物质的贡献,可能有更多地壳物质的加入。推断这些花岗岩可能是在洋壳俯冲过程中,可能是熔自深部地壳(可能是弧物质)的岩浆与来源于亏损地幔的镁铁质岩浆发生混合形成的。结合区域地质背景分析,显示喀纳斯、琼库尔岩体形成于陆弧环境,与其它同期花岗岩一起揭示了阿尔泰造山带最为强烈的一次俯冲、裂解和拼合事件。为我们已经提出的构造演化模式提供了新的证据。
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Key words:
- Granite /
- Early Paleozoic /
- Zircon U-Pb age /
- Geochemistry /
- Altai
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