| 滇西澜沧江南段小湾地区崇山岩群LA-ICP-MS锆石U-Pb年龄及其地质意义 |
| |
| 引用本文： | 徐云飞,刘军平,丛峰,孙柏东,黄晓明.滇西澜沧江南段小湾地区崇山岩群LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2018,37(6):1006-1014. |
| |
| 作者姓名： | 徐云飞 刘军平 丛峰 孙柏东 黄晓明 |
| |
| 作者单位： | 昆明理工大学国土资源工程学院;云南省地质调查院;中国地质调查局成都地质调查中心 |
| |
| 基金项目： | 中国地质调查局项目《云南省1∶5万诗礼、犀牛街、大河、老家库、哨街五幅区域地质矿产调查》（编号：12120114060201） |
| |
| 摘 要： | 滇西崇山岩群一直被认为是元古宙的大陆地壳-结晶基底,但至今无精确的年龄依据。对滇西澜沧江南段小湾地区崇山岩群的5件样品(糜棱岩化斜长变粒岩、黑云斜长角闪岩、片麻岩、糜棱岩化花岗质片麻岩、糜棱岩化黑云斜长变粒岩)进行锆石U-Pb定年。5件样品的锆石阴极发光图像显示,锆石有明显的生长振荡环带,指示岩浆成因。5件样品锆石的206Pb/238U年龄加权平均值分别为239.4±3.8Ma、248.4±4.3Ma、237.1±5.7Ma、268.7±3.2Ma、238.4±5.5Ma。根据野外地质特征和年龄数据,认为滇西澜沧江南段小湾地区崇山岩群是不同时代、不同岩性的岩体/地层(二叠系、三叠系)经后期变质作用形成的一套正变质岩,并不全是古老基底岩石出露。
|
| 关 键 词： | 崇山岩群 LA-ICP-MS锆石U-Pb定年 小湾 澜沧江南段 滇西 |
| 收稿时间： | 2017/3/30 0:00:00 |
| 修稿时间： | 2017/8/6 0:00:00 |
LA-ICP-MS zircon U-Pb dating of the Chongshan Group in the Xiaowan area along the southern section of the Lancang River in western Yunnan and its geological significance |
| |
| XU Yunfei,LIU Junping,CONG Feng,SUN Baidong and HUANG Xiaoming.LA-ICP-MS zircon U-Pb dating of the Chongshan Group in the Xiaowan area along the southern section of the Lancang River in western Yunnan and its geological significance[J].Geologcal Bulletin OF China,2018,37(6):1006-1014. |
| |
| Authors: | XU Yunfei LIU Junping CONG Feng SUN Baidong and HUANG Xiaoming |
| |
| Institution: | Faculty of Land and Resource, Kunming University of Science and Technology, Kunming 650093, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China and Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China |
| |
| Abstract: | This paper focuses on the LA-ICP-MS U-Pb ages of the zircons of five samples(mylonitization plagioclase leptynite, bio-tite amphibolites, gneiss, mylonitization granitic gneiss, and mylonitization biotite amphibolites)from the Chongshan Group in the Xiaowan area along the southern section of Lancang River of western Yunnan.Cathodoluminescence images of five samples reveal that these zircon crystals generally have oscillatory zoning, implying their magatic genesis.One hundred and two analyses of five sam-ples yielded concordance, with their weighted average ages being 239.4±3.8Ma, 248.4±4.3Ma, 237.1±5.7Ma, 268.7±3.2Ma, and 238.4±5.5Ma.According to geological characteristics and available age data, it is considered that the so-called Chongshan Group in the Xiaowan area is orthometamorphite composed of various parent components with different ages rather than entirely Proterozoic crystalline basement rocks as previously considered. |
| |
| Keywords: | Chongshan Group LA-ICP-MS zircon U-Pb dating Xiaowan southern section of Lancang River western Yunnan |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
