| 阿尔泰花岗伟晶岩年代学研究现状——兼谈常规年代学方法在花岗伟晶岩定年中之困惑 |
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| 引用本文： | 钟龙,王政华,刘玉琳. 阿尔泰花岗伟晶岩年代学研究现状——兼谈常规年代学方法在花岗伟晶岩定年中之困惑[J]. 新疆地质, 2011, 29(4): 412-415 |
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| 作者姓名： | 钟龙 王政华 刘玉琳 |
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| 作者单位： | 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871 |
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| 基金项目： | 核资源与环境教育部重点实验室开放基金项目(090901)资助 |
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| 摘 要： | 新疆阿尔泰地区是世界上重要花岗伟晶岩产出地,其形成时代颇受关注,已有的年龄数据虽较多,但其可靠性受到质疑,常规年代学方法在花岗伟晶岩定年中遇到挑战.本文主要对可可托海3号伟晶岩脉多种定年方法所取得年龄数据进行分析,认为由于热液蚀变影响,K-Ar法和40Ar-39Ar法不适合于伟晶岩定年；Rb-Sr等时线法可能因矿物存在放射性87Sr明显丢失而不可用；锆石U-Pb法的适用性取决于锆石情况,如锆石受强烈后期改造(内部细小孔洞和热液边)则年龄数据不可信；未受后期扰动锆石可获得可靠年龄数据.铌钽铁矿U-Pb定年法在伟晶岩定年中具优越性,是当前最可靠方法.基于上述理由,前人研究所获得阿尔泰伟晶岩形成时代(加里东期、印支期和燕山期)有待进一步验证.
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| 关 键 词： | 阿尔泰 花岗伟晶岩 年代学 铌钽铁矿U-Pb法 |
THE GEOCHRONOLOGY RESEARCH STATUS OF ALTAI PEGMATITE,NW CHINA:THE CONFUSION OF THE CONVENTIONAL DATING METHODS USED IN GRANITIC PEGMATITE |
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| ZHONG Long , WANG Zheng-hua , LIU Yu-lin. THE GEOCHRONOLOGY RESEARCH STATUS OF ALTAI PEGMATITE,NW CHINA:THE CONFUSION OF THE CONVENTIONAL DATING METHODS USED IN GRANITIC PEGMATITE[J]. Xinjiang Geology, 2011, 29(4): 412-415 |
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| Authors: | ZHONG Long WANG Zheng-hua LIU Yu-lin |
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| Affiliation: | ZHONG Long,WANG Zheng-hua,LIU Yu-lin(The Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,Peking University,Beijing 100871,China) |
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| Abstract: | Xinjiang,is one of the most important granitic pegmatite output areas in the world.Many researchers focused on its formation time.In the past twenty years,a number of age data have been published,but their accuracy is questionable.So the conventional dating methods encounter problems in the pegmatite dating.In this paper,we analyze the age data of the No.3 vein in Keketuohai dated by a variety dating methods.The K-Ar,40Ar-39Ar and Rb-Sr isochron methods may not be suitable for pegmatite,because of hydrother... |
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| Keywords: | Altai Granitic pegmatite Geochronology Research status Liantratite U-Pb |
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