华北克拉通南缘鲁山太古宙基底的形成和演化

发布时间：2018-03-05 10:21

本文选题：鲁山　切入点：锆石定年　出处：《中国地质》2016年06期 　论文类型：期刊论文

【摘要】：鲁山地区保存和出露很好的太古宙基底岩石。文章报道了2件魏庄片麻岩的原岩年龄分别为(2867±5)Ma和(2768±5)Ma,变质作用时代分别为(2775±6)Ma和(2775±56)Ma。结合已发表数据,魏庄片麻岩原岩形成时代可大致分为2867~2928 Ma和2765~2768 Ma两个阶段;榆树庄片麻岩原岩形成于2829~2897 Ma、2752~2778 Ma和2723 Ma;斜长角闪岩原岩形成于2838~2845 Ma、2747~2794 Ma和2730 Ma。尽管三者岩性上存在差异,但原岩形成的期次和时代相当,指示它们在成因上可能存在联系。鲁山多地陆续发现2.8~2.9 Ga的岩石,表明该地区存在一定规模的中太古代基底。通过与胶东、霍邱等地对比,笔者认为华北克拉通南缘可能存在中太古代的古老陆块,其重要的初生地壳生长事件发生在2.9~3.0 Ga。
[Abstract]:The Archean basement rocks are well preserved and exposed in the Lushan area. The authors report two samples of Weizhuang gneiss at the ages of 2 867 卤5 Ma and 2 768 卤5 Ma, respectively. The metamorphic ages are 2775 卤6 Ma and 2775 卤56 Ma, respectively. The formation age of Weizhuang gneiss can be roughly divided into two stages: 2867 ~ 2928 Ma and 2765 ~ 2768 Ma; Yushuzhuang gneiss was formed at 2829 ~ 2897 Ma ~ 2752 ~ 2778 Ma and 2723 Ma; and amphibolite was formed at 2838 ~ 2845 Ma, 2747 ~ 2794 Ma and 2730 Ma. However, the age and time of the formation of the original rocks are similar, indicating that they may be related in origin. The rocks of 2.82.9 Ga have been discovered in many places in the Lushan Mountains, indicating that there is a certain scale Middle Archean basement in this area. By comparison with Jiaodong, Huoqiu and other places, The authors believe that there may be an ancient Middle Archean continental block in the southern margin of the North China Craton, and its important primary crustal growth event occurred in 2.9g / 3.0Ga.
【作者单位】：中国地质科学院地质研究所北京离子探针中心;
【基金】：国家自然科学基金项目(41402167) 中国地质科学院地质研究所基本科研业务经费(J1506) 中国地质调查局重点项目(12120114021301,12120113013700,1212010811033) 国家973项目(2012CB416600)联合资助~~
【分类号】：P534.2

【相似文献】