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| 赣北庐山地区新元古代细碧-角斑岩系枕状熔岩的发现及其地质意义 | |
| 引用本文： | 董树文,薛怀民,项新葵,马立成.赣北庐山地区新元古代细碧-角斑岩系枕状熔岩的发现及其地质意义[J].中国地质,2010,37(4):1021-1033. |
| 作者姓名： | 董树文 薛怀民 项新葵 马立成 |
| 作者单位： | 1. 中国地质科学院,北京,100037 2. 中国地质科学院地质研究所,北京,100037 3. 江西地矿局916大队,江西,九江,332100 4. 中国地质科学院地质力学研究所,北京,100081 |
| 基金项目： | 深部探测技术与实验研究专项，地质调查工作项目"长江中下游地区地壳精细结构与控矿研究" |
| 摘 要： | 江西庐山地区位于江南造山带的东段北侧,出露前震旦纪星子群和双桥群变质岩,最近在双桥山群地层中发现了一套枕状构造发育的细碧岩-角斑岩组合。通过对细碧岩-角斑岩组合和与其紧密共生的英安岩的元素地球化学研究发现该组合具有洋岛型玄武岩的特点,形成环境为陆壳基础上的弧后小洋盆;英安岩中SHRIMP锆石U-Pb测年得到表面年龄介于830～850Ma,其206Pb-238U加权平均年龄为(840±7)Ma。因此,皖南(歙县)缝合带有可能呈近东西向一直延伸到赣北的庐山地区,而江南造山带至少在830～850Ma期间仍未关闭;同时也证明双桥山群是中、下扬子地块"一盖多底"中基底的一部分。 |
| 关 键 词： | 庐山地区 江南造山带 新元古代 双桥山群 细碧-角斑岩系 枕状构造 |
The discovery of Neoproterozoic pillow lava in spilite-ceratophyre of Lushan area, northern Jiangxi Province, and its geological significance |
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| DONG Shu-wen,XUE Huai-min,XIANG Xin-Kui,MA Li-cheng.The discovery of Neoproterozoic pillow lava in spilite-ceratophyre of Lushan area, northern Jiangxi Province, and its geological significance[J].Chinese Geology,2010,37(4):1021-1033. | |
| Authors: | DONG Shu-wen XUE Huai-min XIANG Xin-Kui MA Li-cheng |
| Institution: | DONG Shu-wen1,XUE Huai-min2,XIANG Xin-Kui3,MA Li-cheng4(1.Chinese Academy of Geological Sciences,Beijing 100037,China,2.Institute of Geology,Chinese Academy of Geological Sciences,3.No.916 Geological Party,Bureau of Geology and Mineral Resources of Jiangxi Province,Jiujiang 332100,Jiangxi,4.Institute of Geomechanics,Beijing 100081,China) |
| Abstract: | Located on the northern side of the eastern section of Jangnan orogen,Lushan area has outcropped metamorphic rocks of Pre-Sinian Xingzi Group and Shuangqiaoshan Group.Recently,the authors found a suite of spilite-ceratophyre with pillow structure in strata of Shuangqiaoshan Group.An analysis of element geochemistry reveals that the spilite-ceratophyre and the concomitant dacite have the characteristics of oceanicisland basalt,hence their formation environment should have been a back-arc small oceanic basin ... |
| Keywords: | Lushan area Jiangnan orogen Neoproterozoic Shuangqiaoshan Group spilite-ceratophyre pillow structure |
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