| 青海德令哈市夏吾一带巴龙贡噶尔组地质特征及时代 |
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| 引用本文： | 李大磊,孙东亮,赵振英,孙健,杨张张,田振,李小明,杨本昭. 青海德令哈市夏吾一带巴龙贡噶尔组地质特征及时代[J]. 地质通报, 2018, 37(4): 634-641 |
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| 作者姓名： | 李大磊 孙东亮 赵振英 孙健 杨张张 田振 李小明 杨本昭 |
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| 作者单位： | 陕西地矿第一地质队 |
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| 基金项目： | 中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》（编号：DD20160012） |
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| 摘 要： | 1∶5万区域地质调查工作对青海夏吾一带巴龙贡噶尔组的岩性特征、基本层序、沉积构造、岩相变化、时代依据等进行了系统收集及研究,于该套地层中新发现了变玄武安山岩。采用LA-ICP-MS锆石U-Pb定年方法,获得锆石U-Pb同位素年龄为427.2±2.8Ma,即该套火山岩形成于早志留世。结合前人研究成果,确定巴龙贡噶尔组的形成时代为早志留世。研究成果对于厘定南祁连的早古生代地层层序及构造演化具有重要意义。
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| 关 键 词： | 青海夏吾 巴龙贡噶尔组 地质特征 时代 |
| 收稿时间： | 2017-07-07 |
| 修稿时间： | 2018-03-13 |
A discussion on the geological characteristics and formation time of Balonggongga'er Formation in Xiawu area of Qinghai Province |
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| LI Dalei,SUN Dongliang,ZHAO Zhenying,SUN Jian,YANG Zhangzhang,TIAN Zhen,LI Xiaoming and YANG Benzhao. A discussion on the geological characteristics and formation time of Balonggongga'er Formation in Xiawu area of Qinghai Province[J]. Geologcal Bulletin of China, 2018, 37(4): 634-641 |
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| Authors: | LI Dalei SUN Dongliang ZHAO Zhenying SUN Jian YANG Zhangzhang TIAN Zhen LI Xiaoming YANG Benzhao |
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| Affiliation: | No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China,No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China,No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China,No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China,No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China,No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China,No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China and No.1 Geological Party, Shaanxi Bureau of Geology and Mineral Resources, Ankang 725000, Shaanxi, China |
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| Abstract: | The Balonggongga''er Formation is distributed in the South Qilian Mountain and belongs to marine terrestrial clastic rock series, and its geological epoch has aroused much attention. Based on 1:50000 regional geological survey, the authors systematically studied the lithological characteristics, basic sequence, sedimentary structure, lithofacies change, and age of the Balonggongga''er For-mation. Some basaltic andesite samples within the Balonggongga''er Formation were identified, and LA-ICP-MS zircon U-Pb analy-ses indicate that the basaltic andesite was formed at 427.2±2.8Ma, belonging to the Early Silurian period. In combination with previous achievements, the authors have further confirmed that the Balonggongga''er Formation was formed in Early Silurian period. These re-sults are of importance for the study of the Early Paleozoic stratigraphic sequence and tectonic evolution in the South Qilian Mountain. |
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| Keywords: | Xiawu of Qinghai Province Balonggongga''er Formation geological characteristics ages |
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