| 浙西南玉岩花岗片麻岩锆石U-Pb年代学——华夏地块古老基底物质的探讨 |
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| 引用本文： | 吕昭英,刘兵,马昌前,刘园园,陈沐龙,傅杨荣,李孙雄,云平.浙西南玉岩花岗片麻岩锆石U-Pb年代学——华夏地块古老基底物质的探讨[J].矿产与地质,2016(4):681-688. |
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| 作者姓名： | 吕昭英 刘兵 马昌前 刘园园 陈沐龙 傅杨荣 李孙雄 云平 |
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| 作者单位： | 1. 中国地质大学 地球科学学院，湖北 武汉 430074; 海南省地质调查院，海南 海口 570206;2. 海南省地质调查院,海南 海口,570206;3. 中国地质大学 地球科学学院，湖北 武汉 430074; 中国地质大学 地质过程与矿产资源国家重点实验室，湖北 武汉 430074;4. 中国地质大学 地球科学学院,湖北 武汉,430074 |
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| 基金项目： | 湖北省自然科学基金重点项目(2009CDA004);教育部和国家外国专家局高等学校学科创新引智计划(编号B07039)资助 |
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| 摘 要： | 通过对浙西南遂昌县玉岩古元古代花岗片麻岩锆石LA-ICP-MS U-Pb年代学研究,以探讨和揭示华夏地区基底的物质组成。玉岩花岗片麻岩锆石可分为两类:第一类锆石年龄相对年轻,其~(207)Pb/~(206)Pb年龄介于597~1917 Ma之间,结合稀土元素特征,表明为变质成因锆石,在锆石谐和图上,15个年轻锆石点整体上构成了一条不一致线,其上交点年龄为1904±19Ma,代表了片麻岩形成的变质时间,表明华夏地区存在古老的古元古代晚期岩浆岩-变质岩基底,下交点年龄为262±47Ma,可能记录了华夏地块晚二叠世―早三叠世构造-变质作用的响应。第二类锆石年龄相对较老,锆石~(207)Pb/~(206)Pb年龄介于2087~2523Ma之间,锆石发育核幔结构并有明显的振荡环带,较老的锆石年龄表明华夏地区可能存在太古宙末至2.5Ga的古老基底物质。
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| 关 键 词： | 古元古代 花岗片麻岩 锆石U-Pb定年 浙西南 |
Zircon U-Pb chronology of Yuyan granitic gneiss in Southwestern Zhej iang:a discussion on ancestral basement materials of Cathaysia Massif |
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| LV Zhaoying;LIU Bing;MA Changqian;LIU Yuanyuan;CHEN Mulong;FU Yangrong;LI Sunxiong;YUN Ping.Zircon U-Pb chronology of Yuyan granitic gneiss in Southwestern Zhej iang:a discussion on ancestral basement materials of Cathaysia Massif[J].Mineral Resources and Geology,2016(4):681-688. |
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| Authors: | LV Zhaoying;LIU Bing;MA Changqian;LIU Yuanyuan;CHEN Mulong;FU Yangrong;LI Sunxiong;YUN Ping |
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| Institution: | LV Zhaoying;LIU Bing;MA Changqian;LIU Yuanyuan;CHEN Mulong;FU Yangrong;LI Sunxiong;YUN Ping;School of Earth Sciences,China University of Geosciences;Hainan Provincial Institute of Geological Survey;State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences; |
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| Abstract: | This paper tried to discuss and expose the composition of the basement materials of Cathaysia Mas-sif through a study on zircon LA-ICP-MS U-Pb chronology of Paleoproterozoic Yuyan granitic gneiss in Suichang of Southwestern Zhejiang.Yuyan granitic gneiss can be categorized into two types:a younger one and an older one.The younger type has younger zircon age and its 207 Pb/206 Pb age falls into the range of 5 9 7-1 9 1 7 Ma.Combined with REE characteristics,it shows that the zircon is of metamorphic genesis.On the concordia diagram of zircon,1 5 younger zircon points form an inconcordant curve:the upper intersection point age is 1904±19 Ma which represents the metamorphic time of formation of gneiss,and it indicates that late Paleoproterozoic magmatite-metamorphic rock basement occurs in Cathaysia area;the lower intersection point age is 262±47 Ma,which might record the response of late Permian-early Triassic tectonic metamor-phism.On the other,the older type has older zircon age and its 207 Pb/206 Pb age ranges within 2087-2523Ma,and the core-mantle structure is developed in zircon with obvious oscillatory zoning,and older zir-con age suggests that ancient basement materials existed since the end of Archaeozoic era to 2.5Ga might oc-cur in Cathaysia area. |
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| Keywords: | Paleoproterozoic granitic gneisses zircon U-Pb dating Southwestern Zhej iang |
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