[1]雷海佳,沈晓明,刘希军.2021.LA-ICP-MS锆石U-Pb定年实验流程的建立及其在滇西剑川正长岩锆石年代学中的应用.大地构造与成矿学,45(4):822-838.doi:10.16539/j.ddgzyckx.2021.04.009
 LEI Haijia,SHEN Xiaoming,LIU Xijun and TANG Xiudang.2021.LA-ICP-MS In-situ Zircon U-Pb Dating and its Application in Zircon Geochronology of the Jianchuan Syenite in Western Yunnan.Geotectonica et Metallogenia,45(4):822-838.doi:10.16539/j.ddgzyckx.2021.04.009
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LA-ICP-MS锆石U-Pb定年实验流程的建立及其在滇西剑川正长岩锆石年代学中的应用
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2021年45卷04期
页码:
822-838
栏目:
岩石大地构造与地球化学
出版日期:
2021-07-25

文章信息/Info

Title:
LA-ICP-MS In-situ Zircon U-Pb Dating and its Application in Zircon Geochronology of the Jianchuan Syenite in Western Yunnan
文章编号:
1001-1552(2021)04-0822-017
作者:
雷海佳1、2 沈晓明2 刘希军1 唐秀党2
1.桂林理工大学 地球科学学院, 广西 桂林 541004; 2.应急管理部国家自然灾害防治研究院, 北京 100085
Author(s):
LEI Haijia1、2 SHEN Xiaoming2 LIU Xijun1 and TANG Xiudang2
1. School of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China
关键词:
LA-ICP-MS 锆石 U-Pb定年 锆石年代学 滇西
Keywords:
LA-ICP-MS Zircon U-Pb dating Syenite western Yunnan
分类号:
P597
DOI:
10.16539/j.ddgzyckx.2021.04.009
文献标志码:
A
摘要:
激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)技术, 能够快速、精确地测定矿物的同位素信息, 是锆石U-Pb年代学最常用的定年方法之一。应急管理部国家自然灾害防治研究院同位素热年代学实验室利用RESOlution SE型193 nm准分子激光器和Agilent 7900型四级杆电感耦合等离子质谱仪联机, 成功建立了锆石U-Pb原位定年方法。对91500、GJ-1、Plesovice、Qinghu和蓬莱5个标准锆石样品开展了详细的U-Pb定年研究, 均获得了与国际推荐值在误差范围内一致的结果, 表明本实验室建立的实验流程准确可靠, 可以实现较老到较年轻锆石U-Pb年龄的精确测定。实验室运用新建立的方法对滇西剑川正长岩进行了锆石U-Pb年代学测试, 结果表明该岩体形成于35.7±0.2 Ma, 属晚始新世, 与SIMS锆石U-Pb定年结果一致。研究发现剑川正长岩中存在晚三叠世-新元古代(220~860 Ma)的继承锆石, 表明岩浆物质来源的多元性。综合前人研究, 剑川正长岩是金沙江碱性岩带向青藏高原东南缘的延伸, 可能形成于晚始新世高原隆升后岩石圈伸展的构造背景。
Abstract:
Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) technology, which can quickly and accurately determine isotope compositions of minerals, is one of the most common dating methods for zircon U-Pb chronology. The Isotope Geochronology Laboratory of the National Institute of Natural Hazards, Ministry of Emergency Management of China successfully established a zircon U-Pb in-situ dating method using a RESOlution SE 193 nm excimer laser and an Agilent 7900 ICP-MS. Five zircon standards including 91500, GJ-1, Plesovice, Qinghu, and Penglai were dated under the conditions of a laser beam spot diameter of 30 μm, a frequency of 8 Hz, and an energy density of 4 J/cm2. The results show that the weighted average 206Pb/238U ages for 91500, GJ-1, Plesovice, Qinghu and Penglai are 1063.2±4.6 Ma (2σ, n=29), 608.7±2.8 Ma (2σ, n=22), 341.7±1.4 Ma (2σ, n=23), 160.5±0.8 Ma (2σ, n=23) and 4.3±0.2 Ma (2σ, n=26), respectively. These results are highly consistent with the reference values by TIMS, indicating that the experimental procedure for LA-ICP-MS established by our laboratory is accurate and reliable. We applied the new method to zircon U-Pb dating of the Jianchuan syenite in western Yunnan. The dating results show that the Jianchuan syenite emplaced in the late Eocene (35.7±0.2 Ma), which is consistent with the SIMS zircon U-Pb ages. We also found inherited zircon grains with U-Pb ages of 220 to 860 Ma in the Jianchuan syenite, indicating the diversity of the magma source. Because the Jianchuan syenite is located in the Jinsha alkaline rock belt which distributes from the north Qiantang block to the Red River fault, we suggest that the Jianchuan syenite was formed in extensional setting after the uplift of the Tibetan Plateau in the late Eocene.

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备注/Memo

备注/Memo:
收稿日期: 2020-06-03; 改回日期: 2020-10-19
项目资助: 中央级公益性科研院所基本科研业务专项(ZDJ2017-24)资助。
第一作者简介: 雷海佳(1997-), 女, 硕士研究生, 地球化学专业。Email: 1132478083@qq.com
通信作者: 沈晓明(1983-), 男, 副研究员, 从事同位素热年代学研究。Email: xiaoming_shen@163.com
刘希军(1980-), 男, 教授, 从事地球化学研究。Email: xijunliu@glut.edu.cn
更新日期/Last Update: 2021-07-20