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| 北祁连东段新元古代火山岩的发现及其特征和形成环境 | |
| 引用本文： | 于福生,漆家福,王春英,张军.北祁连东段新元古代火山岩的发现及其特征和形成环境[J].大地构造与成矿学,2001,25(1):74-82. |
| 作者姓名： | 于福生 漆家福 王春英 张军 |
| 作者单位： | 1. 石油大学地球科学系, 2. 甘肃省第三地质勘察院, 3. 华北油田二连油区服务处, |
| 基金项目： | 1/5万石门川幅、老龙湾幅，， |
| 摘 要： | 1/ 5万石门川幅、老龙湾幅区域地质调研结果表明 ,北祁连东段上吊吊坡地区存在新元古代火山岩 ,Sm- Nd同位素测试结果为 72 3.1± 2 5.0 Ma。地球化学特征揭示该套火山岩为拉斑玄武岩系列 ,稀土、微量元素特征及 Nd同位素特征证明其形成于岛弧环境 ,它是中国大陆在元古代晚期固结过程的产物 ,与当时华北陆块所处的大地构造背景相一致 |
| 关 键 词： | 北祁连东段 新元古代 岛弧火山岩 构造环境 |
| 文章编号： | 1001-1552(2001)01-074-09 |
| 修稿时间： | 2000年9月5日 |
FEATURES OF THE LATE PROTEROZOICMETAMORPHIC VOLCANIC ROCKS IN THE EASTERN PART OF THE NORTHERN QILIAN MOUNTAINS AND THEIR TECTONIC SETTING |
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| YY Fu-sheng,QI Jia-fu,WANG Chun-ying,ZHANG Jun.FEATURES OF THE LATE PROTEROZOICMETAMORPHIC VOLCANIC ROCKS IN THE EASTERN PART OF THE NORTHERN QILIAN MOUNTAINS AND THEIR TECTONIC SETTING[J].Geotectonica et Metallogenia,2001,25(1):74-82. | |
| Authors: | YY Fu-sheng QI Jia-fu WANG Chun-ying ZHANG Jun |
| Abstract: | According to the geological survey on the scale of 1:50,000 in the Shimenchuan and Laolongwan areas, the late Proterozoic volcanic rocks formed about 723 million years ago, and measured by isotope Sm-Nd, have been found in the eastern part of the northern Qilian Mountains. The geochemical features indicate that the volcanic rocks belong to tholeiite system, and that they developed in an island-arc environment based on the analyses of rare earth elements and microelements, along with the isotope Nd. These volcanic rocks resulted from the process of consolidation of the China continent taking place during the Late Proterozoic, which fit with the tectonic setting in the north China terrain. |
| Keywords: | Eastern part of northern Qilian Mountains Late Proterozoic island arc volcanic rocks tectonic setting |
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