| 南秦岭迷坝岩体的地球化学特征及其地质意义 |
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| 引用本文： | 李淼,张成立,苑克增,晏云翔.南秦岭迷坝岩体的地球化学特征及其地质意义[J].西北大学学报,2004,34(3):325-330. |
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| 作者姓名： | 李淼 张成立 苑克增 晏云翔 |
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| 作者单位： | [1]西北大学地质学系，陕西西安710069 [2]济南市自来水公司，山东济南250012 |
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| 基金项目： | 国家自然科学基金资助项目(40372039,49732080) |
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| 摘 要： | 目的 揭示南秦岭勉略带北部迷坝岩体的地球化学特征及其地质意义。方法 利用元素地球化学资料，结合岩体地质和岩相学特征进行研究。结果 岩体相对富集大离子亲石元素和轻稀土元素，亏损高场强元素，K2O Na2O和Sr含量及Zr／Y值较高；岩体具后碰撞高钾钙碱性花岗岩的特征；岩体是由二元岩浆尚未彻底混合而形成的。结论 指示晚三叠世秦岭造山带华北与扬子板块碰撞造山作用已进入到后碰撞演化阶段。
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| 关 键 词： | 后碰撞花岗岩 地球化学 二元岩浆混合 南秦岭 |
| 文章编号： | 1000-274X(2004)03-0325-06 |
| 修稿时间： | 2002年10月14 |
Geochemical characteristics of Miba intrusion in the South Qinling Belt and its geological significance |
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| LI Miao.Geochemical characteristics of Miba intrusion in the South Qinling Belt and its geological significance[J].Journal of Northwest University(Natural Science Edition),2004,34(3):325-330. |
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| Authors: | LI Miao |
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| Abstract: | AimTo investigate the geochemical characteristics of Miba intrusion and its geological significance.MethodsThe investigation is not based solely on chemical criteria,but also on the field ,petrograhical.ResultsMiba granitoids is enriched in LILE and LREE, and relatively depleted in HFSE with high (K_2O+Na_2O),Sr and Zr/Y ratio.ConclusionMiba granitoids is similar to the post-collision granitoids;Miba intrusion had been formed by mixing of two-end magmas;the collision between the South Qinling micro-plate and Yangtze plate had been ended at the age of 220 Ma and then entered into a stage of post-collision. |
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| Keywords: | post-collisional granite geochemistry mixing of two-end magmas South Qinling |
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