扬子地块东缘上海地区泥盆纪岩浆岩特征及其构造意义  

Characteristics and tectonic significance of the Devonian magmatite in Shanghai Area,eastern Yangtze Block

作　　者：文艺洁 李雪 李谦超 王永昊 杨思怡 郭涵 张志伟 邱亮[3] 颜丹平[3] WEN Yijie;LI Xue;LI Qianchao;WANG Yonghao;YANG Siyi;GUO Han;ZHANG Zhiwei;QIU Liang;YAN Danping(School of Energy,China University of Geosciences(Beijing),Beijing 100083,China;Shanghai Geological Engineering Exploration(Group)Co.,Ltd.,Shanghai 200072,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Cores and Samples Center of Nature Resources,China Geological Survey,Langfang 065201,Hebei,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]上海市地矿工程勘察(集团)有限公司,上海200072 [3]中国地质大学(北京)地球科学与资源学院,北京100083 [4]中国地质调查局自然资源实物地质资料中心,河北廊坊065201

出　　处：《河南理工大学学报（自然科学版）》2022年第5期46-57,共12页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41702207,42030306)。

摘　　要：为了揭露扬子地块早古生代岩浆作用特征,厘定加里东构造事件影响范围,以上海地区基岩岩心中安山岩为研究对象,在总结钻孔资料基础上,进行岩石学鉴定、阴极发光测试、锆石U-Pb年代学和微量元素分析。结果表明:镜下观察显示,该岩石基质中含有斜长石、辉石、安山质玻璃等,晶屑以斜长石、中长石和黑云母为主,并可见被方解石充填形成的杏仁状构造;阴极发光显示,锆石内部结构为棱柱状自形结构,多发育震荡环带,表现出典型岩浆锆石特征;UPb定年和微量元素分析显示,锆石w(206Pb)/w(238U)平均年龄为(410.5±1.8)Ma;微量元素测试进一步显示锆石为陆壳起源。结合华南大地构造背景研究,认为华南加里东早古生代岩浆活动产生的背景可能为陆内造山带后期的伸展环境。In order to reveal the characteristics of early Paleozoic magmatism in the Yangtze Block and to determine the scope of influence of the Caledonian tectonic events,the andesites from drill cores in Shanghai Area were identified by microscopy,the zircons incorporated in were separated and then imaged by cathodoluminescence(CL).The CL images showed prismatic and pyramidal crystal forms and magmatic oscillatory,indicating an igneous origin.The zircons yielded a weighted mean U-Pb age of(410.5±1.8)Ma.Furthermore,the geochemistry of the zircons indicated a continental origin.Therefore,It was proposed that the newly discovered Devonian andesite had an affinity of post-orogenic extension of the early Paleozoic orogen.

关 键 词：上海地区 泥盆纪 岩浆岩 加里东构造事件 年代学 

分 类 号：P588.14[天文地球—岩石学] P597[天文地球—地质学]