| 滇中峨山地区中元古界昆阳群黑山头组火山岩锆石U-Pb年龄及其地质意义 |
| |
| 引用本文： | 刘军平,曾文涛,徐云飞,胡绍斌,孙柏东,宋冬虎,吕勃烨,王伟.滇中峨山地区中元古界昆阳群黑山头组火山岩锆石U-Pb年龄及其地质意义[J].地质通报,2018,37(11):2063-2070. |
| |
| 作者姓名： | 刘军平 曾文涛 徐云飞 胡绍斌 孙柏东 宋冬虎 吕勃烨 王伟 |
| |
| 作者单位： | 云南省地质调查院, 云南 昆明 650216,云南省环境监测院, 云南 昆明 650216,昆明理工大学国土资源工程学院, 云南 昆明 650093,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216 |
| |
| 基金项目： | 中国地质调查局项目《云南1∶5万二街、易门、鸣矣河、上浦贝幅区域地质调查》（编号：DD20160017）、《云南区域地质调查片区总结与服务产品开发》（编号：DD20160345-02）和云南省科技领军人才培养计划项目《西南“三江”叠合成矿作用与成矿预测》（编号：2013HA001） |
| |
| 摘 要： | 滇中玉溪—昆阳一带广泛出露的中元古界昆阳群是一套与晋宁运动密切相关的浅变质火山-沉积岩系,其形成时代、沉积充填序列及大地构造属性一直存在争议。出露于峨山县美党地区的昆阳群黑山头组富良棚段发育有厚近百米的安山质熔结凝灰岩、晶屑凝灰岩、玄武岩及岩屑凝灰岩。对样品D0121-1及D0121-2进行同位素年代学研究,分别获得LA-ICP-MS锆石U-Pb年龄加权平均值为1007±13Ma和1005±18Ma;同时,样品D0121-2中还获较多的2200±15Ma继承性锆石,推测滇中地区应存在古元古代的地质体。2件样品锆石的Th/U值均大于0.3,均具清晰的振荡环带结构,均为岩浆成因的锆石,表明黑山头组富良棚段形成于中元古代晚期,属于与造山作用相关的火山岩系,可能是罗迪尼亚超大陆事件在扬子陆块的响应,是全球格林维尔期造山过程的组成部分。
|
| 关 键 词： | 中元古界昆阳群 锆石U-Pb测年 峨山县美党地区 罗迪尼亚超大陆 |
| 收稿时间： | 2018/3/15 0:00:00 |
| 修稿时间： | 2018/5/20 0:00:00 |
U-Pb age of zircons of the volcanic rocks from Heishantou Formation of Mesoproterozoic Kunyang Group in Eshan County, central Yunnan Province, and its geological significance |
| |
| LIU Junping,ZENG Wentao,XU Yunfei,HU Shaobin,SUN Baidong,SONG Donghu,L&#; Boye and WANG Wei.U-Pb age of zircons of the volcanic rocks from Heishantou Formation of Mesoproterozoic Kunyang Group in Eshan County, central Yunnan Province, and its geological significance[J].Geologcal Bulletin OF China,2018,37(11):2063-2070. |
| |
| Authors: | LIU Junping ZENG Wentao XU Yunfei HU Shaobin SUN Baidong SONG Donghu L&#; Boye and WANG Wei |
| |
| Institution: | Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geo-Environment Monitoring, Kunming 650216, Yunnan, China,Kunming University of Science and Technology, Kunming 650093, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China and Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China |
| |
| Abstract: | Mesoproterozoic Kunyang Group,which is widely exposed in Yuxi-Kunyang area in central Yunnan Province, consists of metamorphic volcanic sedimentary rocks that are closely related to the Jinning movement. The chronology, sedimentary filling series and geotectonic features of Kunyang Group are problems of long controversy. There are andesitic ignimbrite, crystal tuff, basalt and lithic tuff several hundred meters in thickness in Fuliangpeng member of Heishantou Formation within Kunyang Group exposed in Meidang area, Eshan County. Two samples of D0121-1 and D0121-2 were used for isotopic dating. The weighted average ages of U-Pb zircon LA-ICP-MS obtained from sample D0121-1 and D0121-2 are 1007±13Ma and 1005±18Ma respectively. In addition, ancient inherited zircon 2200±15Ma was found in sample D0121-2. It is inferred that there is a Paleproterozoic geological body in central Yunnan Province. The Th/U ratios of zircon obtained from both samples are higher than 0.3, suggesting magmatic zircon. It is considered that Fuliangpeng member of Heishantou Formation was formed in the Late Mesoproterozoic period and belonged to the volcanic rock series related to orogeny, which was probably the response of the Rodinia Supercontinent Events in Yangtze continental block, being a part of the global Greenville orogenic process. |
| |
| Keywords: | Mesoproterozoic Kunyang Group zircon U-Pb dating Meidang area of Eshan County Rodinia Supercontinent |
| 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 |
|
