| 大别山北缘凤凰台组砾石地球化学特征及源区构造环境 |
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| 引用本文： | 李双应,李任伟,王道轩,刘因,孟庆任,岳书仓,金福全.大别山北缘凤凰台组砾石地球化学特征及源区构造环境[J].沉积学报,2005,23(3):380-388. |
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| 作者姓名： | 李双应 李任伟 王道轩 刘因 孟庆任 岳书仓 金福全 |
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| 作者单位： | 1. 合肥工业大学资源与环境工程学院,合肥,230009
2. 中国科学院地质与地球物理研究所,北京,100027 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 根据大别山北缘合肥盆地凤凰台组暨毛坦厂组中的榴辉岩、角闪岩、斜长片麻岩等砾石地球化学研究,SiO2含量为43.31%～57.35%,原岩主要为古橄玄武岩-玄武岩-玄武安山岩-玄武粗安岩组成的火山岩,其次为斜长岩和辉绿玢岩等侵入岩.与原始地幔相比,岩石具有LILE富集、Nb-Ta负异常槽明显、Ti强烈亏损等特征.它们可能属于一个由苦橄玄武岩、拉斑玄武岩、英安岩和流纹岩等组成的火山弧,是一个SSZ型岛弧.砾石原岩与北大别杂岩("古岛弧根带")中的镁铁-超镁铁岩带、片麻岩等有成因上的联系.砾石主要不是直接来源于现在遭受剥露的"古岛弧根带",而可能是来自上部的火山弧.
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| 关 键 词： | 砾石 地球化学 凤凰台组 火山弧 大别造山带 |
| 文章编号： | 1000-0550（2005）03-0380-09 |
| 收稿时间： | 2004-08-17 |
| 修稿时间： | 2004-12-09 |
Geochemistry of the Conglomerates and the Tectonic Setting of Their Provenance in Fenghuangtai Formation in the North Margin of the Dabie Mountains |
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| LI Shuang-ying,LI Ren-wei,WANG Dao-xuan,LIU Yin,MENG Qing-ren,YUE Shu-cang,JIN Fu-quan.Geochemistry of the Conglomerates and the Tectonic Setting of Their Provenance in Fenghuangtai Formation in the North Margin of the Dabie Mountains[J].Acta Sedimentologica Sinica,2005,23(3):380-388. |
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| Authors: | LI Shuang-ying LI Ren-wei WANG Dao-xuan LIU Yin MENG Qing-ren YUE Shu-cang JIN Fu-quan |
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| Abstract: | Based on the study of geochemistry of the conglomerates of eclogites, hornblende schist, plagiognesis etc. in Fenghuangtai and Maotangchang Formations located in the north margin of the Dabie Mountains, concentrations of SiO_ 2 are 43.31% ~ 57.35% in conglomerates, and their protoliths consist of mainly volcanic rocks of basalt, basaltic andesite, basalatite, secondly intruded rocks of anorthosite and diabase-prophyrite etc. They are characterized as enrichment in LILE, notable Nb-Ta depleted through, and Ti depleted in comparison with primitive mantle. This indicates that they formed in an SSZ type island-arc setting. There was a relation between protoliths of the gravels and magnesioferrite and super magnesioferrite belt, gneiss etc. of north Dabie complex (paleo-island arc root belt). The conglomerates may come from the upper of the volcanic arc, not paleo-island arc root belt being suffered denudation now. |
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| Keywords: | conglomerales geochemistry Fenghuangtai Formation volcanic are the Dabie Orogenic Belt |
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