| 恒山-五台地区同位素年代学与地质事件演化系列的建立 |
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| 引用本文：牛向龙,李江海.2005.恒山-五台地区同位素年代学与地质事件演化系列的建立[J].地球学报,26(z1):115-117. |
| DOI：10.3975/cagsb.2005.s1.38 |
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| 基金项目:本课题得到北京大学重点测试基金的资助。 |
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| 中文摘要:本文根据近几年在恒山和五台地区所获得的大量同位素年代学资料，统计发现恒山杂岩的同位素年龄峰值比五台杂岩大致要晚20 Ma，即深层次地壳有更持久的热演化历史，为恒山-五台岛弧根带一岛弧提供了一个佐证。综合分析同一期不同地质记录，从而将五台杂岩和恒山杂岩从新太古代晚期至古元古代末期的演化划分为5期区域性事件。华北东西陆块的俯冲碰撞应该发生在2.55~2.50 Ga期间。 |
| 中文关键词:锆石年龄 事件演化 恒山杂岩 五台杂岩 |
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| Geochronology and Geological Event Sequences of Hengshan-Wutai Precambrian Complex |
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| Abstract:Statistics of many new isotopic age data show that the peak value of Hengshan complex (2520 Ma) is some 20 Ma younger than that of Wutai complex (2540 Ma)．This serves as the evidence that Hengshan complex might be the arc root of Wutai complex. Based on an integrated analysis of various geological records, the authors have divided the evolution of Wutai-Hengshan Precambrian complex into five stages. It is thus inferred that the central arogeny should have taken place between 2.55 and 2.50 Ga in North China craton. |
| keywords:isotopic age geological event Hengsban Complex Wutai complex |
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