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| 南秦岭西乡群孙家河组锆石SHRIMP U-Pb年龄及其构造地质意义 |
| 崔建堂,王峰,段建国,赵陕兰,崔海涛,崔海曼 |
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(1. 陕西省核工业地质调查院, 陕西 西安 710054;
2. 陕西省地质调查中心, 陕西 西安 710065;
3. 陕西区域地质矿产研究院, 陕西 咸阳 712000;
4. 陕西省地矿总公司第二地质大队, 陕西 汉中 723000) |
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| 摘要: |
| 南秦岭西乡群孙家河组英安质火山熔岩进行了锆石SHRIMP U-Pb年龄和岩石化学、稀土元素、微量元素等方面的研究。获得的锆石年龄为814.8±5.2Ma,属于晚青白口世。该年龄为研究南秦岭扬子陆块过渡基底的形成时代提供了有力的佐证,并为研究扬子陆块Rodinia超大陆汇聚时限及秦岭造山带的构造演化提供了新证据。 |
| 关键词: 南秦岭 西乡群 孙家河组 锆石SHRIMP U-Pb年龄 |
| DOI： |
| 附件 |
| 投稿时间：2013-11-12 |
| 基金项目:中国地质调查局项目《陕西省地质系列图件编制与综合研究》 |
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| The Sunjiahe Formation of the Xixiang Group, southern Qinling Ranges: SHRIMP zircon U-Pb age and its tectonic implications |
| CUI Jian-tang, WANG Feng, DUAN Jian-guo, ZHAO Shan-lan, CUI Hai-tao, CUI Hai-man |
(1. Institute of Geological Survey, Shaanxi Geological Bureau of Nuclear Industry, Xi'an 710054, Shaanxi, China;
2. Xi'an Center, China Geological Survey, Xi'an 710065, Shaanxi, China;
3. Research Institute of Regional Geology and Mineral Resources, Xianyang 712000, Shaanxi, China;
4. No.2 Geological Party, Shaanxi Corporation of Exploration and Development of Geology and Mineral Resources, Hanzhong 723000, Shaanxi, China) |
| Abstract: |
| The dacitic lavas from the Sunjiahe Formation in the Xixiang Group, southern Qinling Ranges are examined on the basis of lithochemical, REE and Trace element data, and give a SHRIMP zircon U-Pb age of 814.8±5.2 Ma which represents the late Qingbaikouan. This age provides a new evidence for the approaches to the ages of the transitional besement of the Yangtze block in southern Qinling Ranges, and the convergence timing of the supercontinent Rodinia in the Yangtze block and tectonic evolution of the Qinling orogenic zone. |
| Key words: southern Qinling Ranges Xixiang Group Sunjiahe Formation SHRIMP zircon U-Pb age |