| 大兴安岭中部柴河——蘑菇气地区早白垩世中性火山岩岩石成因及构造背景 |
| |
| 引用本文： | 施璐,唐振,郑常青,秦涛,张立东,汪岩,钱程,杨帆,陈敏华.大兴安岭中部柴河——蘑菇气地区早白垩世中性火山岩岩石成因及构造背景[J].地质通报,2018,37(9):1620-1632. |
| |
| 作者姓名： | 施璐 唐振 郑常青 秦涛 张立东 汪岩 钱程 杨帆 陈敏华 |
| |
| 作者单位： | 中国地质调查局沈阳地质调查中心;吉林大学地球科学学院;赤峰吉隆矿业有限责任公司 |
| |
| 基金项目： | 中国地质调查局项目《大兴安岭成矿带突泉—翁牛特地区地质矿产调查》（编号：DD20160048）、《内蒙古1∶5万楞吉曼达坂、吉日根林场外站、西马拉吐、乌兰沼、巴彦套海幅区域地质调查》（编号：DD20160048-02）和《内蒙古1∶25万柴河镇、蘑菇气幅区调修测》（编号：1212011120654） |
| |
| 摘 要： | 大兴安岭中部柴河—蘑菇气地区早白垩世中性火山岩岩相学研究表明,其主要岩石组合为安山岩、英安岩、安山质晶屑凝灰熔岩、凝灰角砾熔岩等,LA-ICP-MS锆石U-Pb测年结果显示其形成于140~130Ma之间。岩石主量元素具有富钾钠、富铝,贫镁的特点,属高钾钙碱性岩石。相对富集轻稀土元素、亏损重稀土元素,无明显的Eu异常,微量元素主要富集大离子亲石元素(如Rb、K、LREE)和Ba、Sr元素,亏损高场强元素(Ta、Nb、P、Ti)。地球化学特征指示,这些早白垩世中性火山岩来源于新元古代和古生代期间新增生的下地壳玄武质岩石的部分熔融,并可能受到早先俯冲事件带来的流体的影响,形成于蒙古-鄂霍茨克洋闭合陆壳加厚之后的岩石圈伸展环境。
|
| 关 键 词： | 大兴安岭中部 早白垩世 中性火山岩 岩石成因 构造背景 |
| 收稿时间： | 2018/2/5 0:00:00 |
| 修稿时间： | 2018/3/8 0:00:00 |
Genesis and tectonic significance of the Early Cretaceous intermediate volcanic rocks in Chaihe-Moguqi area, central Da Hinggan Mountains |
| |
| SHI Lu,TANG Zhen,ZHENG Changqing,QIN Tao,ZHANG Lidong,WANG Yan,QIAN Cheng,YANG Fan and CHEN Minhua.Genesis and tectonic significance of the Early Cretaceous intermediate volcanic rocks in Chaihe-Moguqi area, central Da Hinggan Mountains[J].Geologcal Bulletin OF China,2018,37(9):1620-1632. |
| |
| Authors: | SHI Lu TANG Zhen ZHENG Changqing QIN Tao ZHANG Lidong WANG Yan QIAN Cheng YANG Fan and CHEN Minhua |
| |
| Institution: | Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, Liaoning, China,College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China,Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, Liaoning, China,Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, Liaoning, China and Chifeng Jilong Co., LTD, Chifeng 024313, Inner mongolia, China |
| |
| Abstract: | In this paper, the authors studied the Early Cretaceous intermediate volcanic rocks in Chaihe-Moguqi area, central Da Hinggan Mountains. The intermediate volcanic rocks consist of andesite, dacite, intermediate lava and tuff, formed from ~140 to ~130Ma. Chemical analyses show that the intermediate volcanic rocks are classified as high-K calc-alkaline volcanic rocks, and are characterized by enrichment of light rare earth elements (LREEs), large ion lithophile elements (LILEs), Ba, Sr, and depletion of heavy rare earth elements (HREEs), high field strength elements (HFSEs), with no distinct Eu anomalies. All the geochemical charac-teristics suggest that the Early Cretaceous intermediate volcanic rocks were derived from the partial melting of a juvenile lower crustal basaltic rocks, and might have been affected by the fluid caused by earlier subduction event. The authors hold that the generation of the Early Cretaceous intermediate volcanic rocks was related to the lithospheric extensional setting after the final closure of the Mongol-Okhotsk Ocean and subsequent continental thickening. |
| |
| Keywords: | central Da Hinggan Mountains Early Cretaceous intermediate volcanic rocks petrogenesis tectonic setting |
| 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 |
|
