|
|||||
|
|
| 松辽盆地长岭断陷中基性火山岩的时代与其成因 | |
| 引用本文： | 温升福,刘曼丽,刘玮,李瑞磊,苟军,武鹏飞,王天豪,柳小明,孙德有.松辽盆地长岭断陷中基性火山岩的时代与其成因[J].吉林大学学报(地球科学版),2013,43(6):1762. |
| 作者姓名： | 温升福 刘曼丽 刘玮 李瑞磊 苟军 武鹏飞 王天豪 柳小明 孙德有 |
| 作者单位： | 1.吉林大学地球科学学院，长春130061; 2.中国石化东北油气分公司，长春130062; 3.西北大学大陆动力学国家重点实验室，西安710069 |
| 基金项目： | 中石化东北油气分公司项目;国家重点基础研究发展计划（973计划） |
| 摘 要： | 锆石U-Pb定年结果显示，松辽盆地长岭断陷松南180井中基性火山岩形成于101～116 Ma的早白垩世晚期，属于营城组，非火石岭组火山岩。岩相学观察主要由安山岩和橄榄玄武岩组成，化学成分显示为玄武岩、粗面玄武岩和玄武质粗面安山岩，属碱性系列，镁质量分数较低，镁值较小（Mg#=0.27~0.53）。稀土元素总量较高（w（∑REE）=（164.98~257.27）×10-6），轻重稀土分馏明显（（La/Yb）N=6.60~10.96），铕异常微弱（δEu=0.85~1.02）。富集大离子亲石元素和轻稀土元素, Rb，K 相对亏损，相容元素（Cr、Co、Ni）质量分数低，高场强元素Nb、Ta弱富集，整体表现出与 OIB(洋岛玄武岩)一致的稀土图谱和微量元素特征。岩浆源区为软流圈地幔，经历了深部地幔流体的交代富集作用，岩浆未遭受地壳物质的混染。 |
| 关 键 词： | 长岭断陷 中基性火山岩 锆石U-Pb年龄 岩石成因 地球化学 |
| 收稿时间： | 2013-06-17 |
Geochronology and Petrogenesis of Intermediate-Basic Volcanic Rocks from Changling Depression in the Songliao Basin |
|
| Wen Shengfu,Liu Manli,Liu Wei,Li Ruilei,Gou Jun,Wu Pengfei,Wang Tianhao,Liu Xiaoming,Sun Deyou.Geochronology and Petrogenesis of Intermediate-Basic Volcanic Rocks from Changling Depression in the Songliao Basin[J].Journal of Jilin Unviersity:Earth Science Edition,2013,43(6):1762. | |
| Authors: | Wen Shengfu Liu Manli Liu Wei Li Ruilei Gou Jun Wu Pengfei Wang Tianhao Liu Xiaoming Sun Deyou |
| Institution: | 1.College of Earth Sciences, Jilin University, Changchun130061, China; 2.Research Institute of Exploration and Development,Northeast Branch Corporation,SINOPEC, Changchun130061, China; 3.State Key Laboratory of Continental Dynamics, Northwest University, Xi’an710069, China |
| Abstract: | Zircon U-Pb dating results show that the intermediate basic volcanic rocks from Changling depression in the Songliao basin formed at Early Cretaceous, rangingd from 101 Ma to 116 Ma, which belong to Yingcheng Formation rather than Huoshiling Formation. Petrologically, the volcanic rocks are composed dominantly of olivine basalt and andesite, but geochemical data show that the volcanic rocks belong to alkaline series and are composed mainly of basalt, trachybasalt and basaltic trachyandesite. The intermediate-basic volcanic rocks have low contents of MgO and small Mg# (0.27-0.53); The chondrite-normalized rare earth element (REE) patterns indicate that the volcanic rocks show significant fractionation of HREE and LREE \(La/Yb)N=6.60-10.96\] and weak Eu anoalies(δEu=0.85-1.02); The trace element geochemistry are characterized by enrichment in large ionic lithophile elements and LREEs, weak positive anomalies in Nb，Ta, depletion in compatible elements (Cr, Co, Ni) and Rb，K. All of the samples display highly consistent REE patterns and trace elements spider diagrams with OIB. The magma source is situated in the asthenospheric mantle, and experienced deep mantle fluid metasomatism enrichment. These rocks were not accompanied by contamination of continent crustal materials during their magmatic evolution. |
| Keywords: | Changling depression intermediate-basic volcanic rocks zircon U-Pb dating petrogenesis geochemistry |
| 本文献已被 万方数据 等数据库收录！ | |
| 点击此处可从《吉林大学学报(地球科学版)》浏览原始摘要信息 | |
| 点击此处可从《吉林大学学报(地球科学版)》下载免费的PDF全文 | |