| 青海锡铁山地区滩间山群的地质特征及同位素年代学 |
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| 引用本文： | 赵风清,郭进京,李怀坤.青海锡铁山地区滩间山群的地质特征及同位素年代学[J].地质通报,2003,22(1):28-31. |
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| 作者姓名： | 赵风清 郭进京 李怀坤 |
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| 作者单位： | 1. 成都理工大学,四川,成都,610059;四川省地质调查院区域地质调查所,四川,双流,610213
2. 四川省地质调查院区域地质调查所,四川,双流,610213 |
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| 基金项目： | 中国地质调查局1∶25万措勤幅地质调查项目成果 |
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| 摘 要： | 冈底斯山仲巴县麦嘎乡附近一套第四纪火山岩是青藏高原空白区地质填图的重要发现之一，本文详细论述了该套火山岩的地质特征，岩石化学特征，地球化学特征，讨论了火山岩的形成朝代，这一发现不仅填补了冈底斯陆缘火山弧第四纪火山岩研究的空白，完善了冈底斯带岩浆演化的时空格架，而且对整个青藏高原隆升机制的研究也具有重要意义。
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| 关 键 词： | 西藏 青藏高原 第四纪 火山岩 冈底斯岩浆带 |
| 文章编号： | 1671-2552(2003)01-0016-05 |
| 修稿时间： | 2002年3月18日 |
LA-ICP-MS U-Pb dating of zircons from Guangshan and Zhaxi plutons in Shaoxing area, Zhejiang Province: constraint on the ore-forming epoch of the Lizhu iron ore deposit |
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| GU Ming-guang,FENG Li-xin,HU Yan-hu,YU Sheng-qiang,WU Ming.LA-ICP-MS U-Pb dating of zircons from Guangshan and Zhaxi plutons in Shaoxing area, Zhejiang Province: constraint on the ore-forming epoch of the Lizhu iron ore deposit[J].Geologcal Bulletin OF China,2003,22(1):28-31. |
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| Authors: | GU Ming-guang FENG Li-xin HU Yan-hu YU Sheng-qiang WU Ming |
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| Institution: | 1. School of Earth Science, China University of Geosciences, Wuhan 430074, Hubei, China;
2. Zhejiang Institute of Geological Survey, Hangzhou 311203, Zhejiang, China |
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| Abstract: | The LA-ICP-MS U-Pb dating of zircons was carried out for two representative rock samples from Guangshan and Zhaxi plutons, which are closely related to mineralization of the Lizhu iron ore deposit. Based on the obtained results and regional chronologic data of mineralization, this paper has dealt with the mineralization age of the Lizhu iron ore deposit. The samples from Zhaxi pluton yielded the age of 150.1±2.6Ma, which is interpreted as its petrogenic age, and the sample from Guangshan pluton shows a number of magmatic events, with the main petrogenic age 147.2±1.7Ma, suggesting that both plutons belong to Yanshannian granitoids. Geological features of the Lizhu iron ore district show that mineralization of the Lizhu iron ore deposit was closely related to the magmatic hydrothermal event of Guangshan and Zhaxi plutons. In other words, the formation age of Guangshan and Zhaxi plutons represents the ore-forming age of the Lizhu iron ore deposit, i.e., Lizhu iron ore bodies were formed in Jurassic (~150Ma). Precise mineralization age of the Lizhu iron ore deposit plays a guiding role in search for the same type of ore deposits in adjacent areas. |
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| Keywords: | Qinghai -Tibet Plateau Gangdise area Quaternary volcanic rock |
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