| 扬子地台东南缘上奥陶统五峰组斑脱岩锆石U-Pb年龄及其地质意义 |
| |
| 引用本文： | 叶飞,潘文,左勇,尹廷龙,蒋天锐,杨胜堂,杨光龙,周灵,刘健,占朋才,周宁,覃智贵.扬子地台东南缘上奥陶统五峰组斑脱岩锆石U-Pb年龄及其地质意义[J].地质通报,2019,38(10):1718-1725. |
| |
| 作者姓名： | 叶飞 潘文 左勇 尹廷龙 蒋天锐 杨胜堂 杨光龙 周灵 刘健 占朋才 周宁 覃智贵 |
| |
| 作者单位： | 贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300;中国地质大学(武汉), 湖北 武汉 430074,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇六地质大队, 贵州 遵义 563000,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300,贵州省地矿局一〇三地质大队, 贵州 铜仁 554300 |
| |
| 基金项目： | 中国地质调查局项目《贵州1：5万大坝场等2幅区域地质调查》（编号：1212201010000150011-12）、贵州省地矿局重大科研项目《黔东北若干超大型锰矿床三维地质建模与数据挖掘》（编号：黔地矿科合[2017]2号）和贵州省科技支撑项目《锰矿勘查与开发大数据管理与智能处理系统研发应用》（编号：黔科技支撑[2017]2951） |
| |
| 摘 要： | 扬子板块东南缘思南地区上奥陶统顶部—下志留统底部地层中普遍发育一层斑脱岩。选取思南县罗湾沱上奥陶统五峰组剖面进行LA-ICP-MS锆石U-Pb测年,获得其年龄加权平均值为449±11Ma,限定了该区域奥陶系—志留系地层沉积年龄,为扬子板块东南缘思南地区奥陶系—志留系界线附近的火山喷发事件、地层年代学研究提供了较可靠的证据。449±11Ma的年龄与扬子板块北西大巴山一带的年龄数据高度吻合,但略晚于华北克拉通西南缘奥陶系顶部斑脱岩的年龄(449.0～465.8Ma)。其所代表的火山活动可能与华夏板块向扬子板块俯冲有关。晚奥陶世—早志留世晚期,多期次的火山喷发事件影响了当时的海洋化学条件、生态圈环境,造成中—晚奥陶世以来的生物灭绝事件及冰川启动。
|
| 关 键 词： | 扬子板块东南缘 斑脱岩 锆石U-Pb年龄 火山喷发事件 生物灭绝 |
| 收稿时间： | 2019/1/10 0:00:00 |
| 修稿时间： | 2019/5/10 0:00:00 |
Zircon U-Pb age of bertonite of Upper Ordovician Wufeng Formation in Southeast Yangtze platform and its geological significance |
| |
| YE Fei,PAN Wen,ZUO Yong,YIN Tinglong,JIANG Tianrui,YANG Shengtang,YANG Guanglong,ZHOU Ling,LIU Jian,ZHAN Pengcai,ZHOU Ning and QIN Zhigui.Zircon U-Pb age of bertonite of Upper Ordovician Wufeng Formation in Southeast Yangtze platform and its geological significance[J].Geologcal Bulletin OF China,2019,38(10):1718-1725. |
| |
| Authors: | YE Fei PAN Wen ZUO Yong YIN Tinglong JIANG Tianrui YANG Shengtang YANG Guanglong ZHOU Ling LIU Jian ZHAN Pengcai ZHOU Ning and QIN Zhigui |
| |
| Institution: | Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China;China University of Geosciences, Wuhan 430074, Hubei, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 106 Guizhou bureau of Geologoy and Minerals, Zunyi 563000, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China,Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China and Geological Party 103 Guizhou Bureau of Geologoy and Minerals, Tongren 554300, Guizhou, China |
| |
| Abstract: | A layer of bentonite is usually developed in upper Ordovician and lower Silurian strata of southeast Yangtze platform in Sinan area. Sampling was done in Wufeng Formation of upper Ordovician and Longmaxi Formation of lower Silurian in Luowantuo of Sinan, high precision U-Pb dating was conducted and as a result, the stratigraphic sedimentary age of Wufeng Formation and Longmaxi Formation in this area were constrained. The data obtained provide reliable evidence for volcanic eruption and stratigraphic chronology near Ordovician and Silurian boundary of southeast Yangtze platform in Sinan area. The age data are correlated well with the data obtained in Dabashan of northwest China, which is a little later than the age of Ordovician bentonite in southeast of the North China Craton (449.0~465.8Ma). The volcanic activity was probably related to the subduction of Cathaysian plate to Yangtze plate. During Middle-Late Ordovician and late Early Silurian, many volcanic eruptions influenced the chemical condition and ecological environment of the ocean in that period and caused the extinction and glacier initiation since middle-late Ordovician. |
| |
| Keywords: | Southeast Yangtze platform bentonite zircon U-Pb age volcanic eruption extinction |
| 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 |
|
