| 云南东川地区昆阳群黑山组凝灰岩锆石SHRIMP U—Pb年龄及其地层学意义 |
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| 引用本文： | 孙志明,;尹福光,;关俊雷,;刘建辉,;李军敏,;耿全如,;王立全.云南东川地区昆阳群黑山组凝灰岩锆石SHRIMP U—Pb年龄及其地层学意义[J].中国区域地质,2009(7):896-900. |
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| 作者姓名： | 孙志明 ;尹福光 ;关俊雷 ;刘建辉 ;李军敏 ;耿全如 ;王立全 |
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| 作者单位： | [1]中国地质调查局成都地质矿产研究所,四川成都610082; [2]北京离子探针中心,北京100037 |
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| 基金项目： | 国家973项目（编号：2009CB421003）、国家自然科学基金项目（编号：40773001）和中国地质调查局《西南地区基础地质综合研究》项目（编号：121201061023）共同资助 |
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| 摘 要： | 云南东川地区昆阳群的形成时代及地层层序一直令人关注，已获得的一些数据虽然具有参考意义，但高质量的SHRIMP定年还很缺乏。在东川地区昆阳群黑山组中上段发育的近180m厚的具有地层意义的晶屑、岩屑凝灰岩中采集样品D0202一件，选出锆石百余粒，获得SHRIMPU-Pb加权平均年龄为（1503±17）Ma。样品D0202的锆石Th／U大于0．48，并具清晰的振荡环带结构，均为岩浆成因的锆石，表明黑山组形成于中元古代早期。这一年龄表明昆阳群的形成时代至少大于1500Ma，为准确地标定昆阳群的时代和层序提供了新的参考依据。
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| 关 键 词： | 云南东川地区 昆阳群 锆石SHRIMP U-Pb年龄 中元古代 |
SHRIMP U-Pb dating and its stratigraphic significance of tuff zircons from Heishan Formation of Kunyang Group,Dongchuan area,Ynnnan Province,China. |
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| Institution: | SUN Zhi-ming, YIN Fu-guang, GUAN Jun-lei, LIU Jian-hui, LI Jun-min, GENG Quan-ru, WANG Li-quan(1. Chengdu Institute of Geology and Mineral Resources, China Geological Survey, Chengdu 610082, Sichuan, China; 2. Beijing SHRIMP Center, Beijing 100037, China) |
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| Abstract: | There have been a lot of interests on the formation age of Kunyang Formation and its stratigraphy for a long time, some of the data obtained are referable while there is still a lack of high quality SHRIMP dating. During this time, Sample D0202 in representative of crystal chips and lithic fragments tuff with great stratigraphic significance was collected from middle to upper Heishan Group with a thickness about 180m in Dongyang Area, Yunnan Province, from which over one hundred zircons were picked out to go through SHRIMP U-Pb dating, at the end, it＇s indicated that the weighted average age is （1503±17）Ma. Th/U value of Sample D0202 is over 0.48, and it displays a distinct oscillatory zoning structure, which can be regarded as typical magmatic cause, these all indicate that Heishan Formation is formed during Early Mesoproterozoic. This result can further prove that the formation age of Kunyang Group is over 1500 Ma, thus can be provided as an evidence for ascertaining the age and stratigraphy of Kunyang Group. |
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| Keywords: | Dongchuan area Yunnan Province Kunyang Formation Zircon SHRIMP U-Pb dating age Mesoproterozoic |
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