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| 中祁连山东段皋兰岩群地质时代的微古植物新证据 | |
| 引用本文： | 闫海卿,钱壮志,刘继庆,焦建刚,肖林.中祁连山东段皋兰岩群地质时代的微古植物新证据[J].地质论评,2005,51(2):113-119,i001. |
| 作者姓名： | 闫海卿 钱壮志 刘继庆 焦建刚 肖林 |
| 作者单位： | 1. 中国地质大学,北京,100083;长安大学,西安,710054 2. 长安大学,西安,710054 3. 甘肃省地勘局第三地质矿产勘查院,兰州,730050 |
| 基金项目： | 中国地质调查局地质调查项目;"中国超大型镍铜铂岩浆硫化物矿床预测研究"项目 |
| 摘 要： | 厘定中祁连地块褶皱基底的时代，对探讨中祁连地块构造属性以及研究祁连造山带构造演化有重要意义。长期以来，由于缺乏化石依据，加上同位素年龄测定受该区岩浆事件扰动的影响，中祁连东段褶皱基底皋兰岩群地质时代厘定始终悬而未决，本次1：25万兰州市幅区域地质调查，采获大量蓟县纪微古植物化石，并获得Sm—Nd等时线年龄1180Ma。作者根据皋兰岩群岩石组合、同位素年龄、微古植物化石等方面的特征，结合区域地层对比，将皋兰岩群地层时代厘定为中元古代。 |
| 关 键 词： | 中祁连 皋兰岩群 同位素年龄 微古植物 时代厘定 |
New Evidences of Micropaleoplants for the Time of the Gaolan Rock Group in the Eastern Section of the Central Qilian Mountains |
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| YAN Haiqing,QIAN Zhuangzhi ,LIU Jiqing ,JIAO Jiangang ,XIAO Lin China University of Geosciences,Beijing, Changan University,Xian,Shaanxi, No.New Evidences of Micropaleoplants for the Time of the Gaolan Rock Group in the Eastern Section of the Central Qilian Mountains[J].Geological Review,2005,51(2):113-119,i001. | |
| Authors: | YAN Haiqing QIAN Zhuangzhi LIU Jiqing JIAO Jiangang XIAO Lin China University of Geosciences Beijing Changan University Xian Shaanxi No |
| Institution: | YAN Haiqing,QIAN Zhuangzhi ,LIU Jiqing ,JIAO Jiangang ,XIAO Lin China University of Geosciences,Beijing, Changan University,Xian,Shaanxi, No. Institute of Geology and Mineral Exploration,Gansu Bureau of Geology and Mineral Resources,Lanzhuo,Gansu |
| Abstract: | Dating the Gaolan Group in the Central Qilian fold basement is important for reconstructing the evolution of the Qilian Orogenic Belt. As a result of the lack of fossil and that isotopic age determination is disordered by magmatism, the geological age of the Gaolan Group has not been determined for a long time. We found a lot of micropaleoplants of the Jixian period in the area. At the same time, a Sm-Nd isochron age of 1180 Ma is obtained. According to the regional stratigraphic correlation, isotopic age and micropaleoplants, we put the Gaolan Group in the Mesoproterozoic. |
| Keywords: | Gaolan Rock Group isotopic age paleomicroplant |
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