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松辽盆地东南缘晚中生代火山事件的锆石年代学与地球化学制约
引用本文:章凤奇,程晓敢,陈汉林,董传万,余星,肖骏,徐岩,庞彦明,舒萍.松辽盆地东南缘晚中生代火山事件的锆石年代学与地球化学制约[J].岩石学报,2009,25(1):39-54.
作者姓名:章凤奇  程晓敢  陈汉林  董传万  余星  肖骏  徐岩  庞彦明  舒萍
作者单位:1. 浙江大学地球科学系,杭州,310027;大庆油田有限责任公司勘探开发研究院,大庆,163712
2. 浙江大学地球科学系,杭州,310027
3. 大庆油田有限责任公司勘探开发研究院,大庆,163712
基金项目:中国博士后科学基金面上项目(20070421162)和国家重点基础研究发展计划(973)项目(2007CB411303)
摘    要:松辽盆地东南缘营城组地层中发育大量的晚中生代火山岩。SHRIMP锆石U-Pb测年表明,火山岩主要形成于117~110Ma,可以划分出早、晚两期,时代上属于早白垩世Albian期-Aptian期。岩石学和地球化学研究表明火山活动早期以酸性喷发为主,晚期则以中基性的玄武粗安岩喷发为主,基本上都属高钾钙碱性系列或亚碱系列,两期火山岩具有演化的亲缘性特征。Sr-Nd同位素研究表明,早、晚两期火山岩是同源岩浆演化的产物,来源于亏损型地幔源区,但演化过程又受到地壳物质不同程度的混染。松辽盆地东南缘火山事件的精确厘定对认识覆盖区晚中生代火山活动序列及邻区岩浆事件的对比具有重要的意义。

关 键 词:松辽盆地  营城组  火山岩  锆石SHRIMP年代学  地球化学
收稿时间:2008/5/19 0:00:00
修稿时间:2008/8/22 0:00:00

Zircon chronological and geochemical constraints on the Late Mesozoic volcanic events in the southeastern margin of the Songliao Basin, NE China
ZHANG FengQi,CHENG XiaoGan,CHEN HanLin,DONG ChuanWan,YU Xing,XIAO Jun,XU Yan,PANG YanMing and SHU Ping.Zircon chronological and geochemical constraints on the Late Mesozoic volcanic events in the southeastern margin of the Songliao Basin, NE China[J].Acta Petrologica Sinica,2009,25(1):39-54.
Authors:ZHANG FengQi  CHENG XiaoGan  CHEN HanLin  DONG ChuanWan  YU Xing  XIAO Jun  XU Yan  PANG YanMing and SHU Ping
Institution:Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China; Research Institute of Petroleum Exploration and Development, Daqing Oil field, Daqing 163712, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Research Institute of Petroleum Exploration and Development, Daqing Oil field, Daqing 163712, China;Research Institute of Petroleum Exploration and Development, Daqing Oil field, Daqing 163712, China
Abstract:The Late Mesozoic volcanic rocks are widely distributed in the Yingcheng Formation in southeastern margin of the Songliao Basin. SHRIMP zircon U-Pb dating gives ages between 117Ma and 110Ma for the volcanic rocks indicating that the volcanic succession formed around Aptian-Albian of the Early Cretaceous. Two stages of the volcanism can be identified according to the sedimentary interlayer. Petrographical and geochemical study shows that the early stage was characterized with acidic eruption, while the late stage mainly with medium-basic magmatism. All the rocks are mostly belong to high-K calc-alkaline series or sub-alkaline series. There is an intimate geochemical evolution relationship between the acidic and the medium-basic. Sr-Nd isotopic result indicates that these two volcanic successions were derived from the same magma source, a depleted mantle, and contaminated by the crust in different level during the period of ascending and evolving. Good determination on the volcanic events in the southeastern margin of the Songliao Basin is significant for the study of the Late Mesozoic volcanic activities in the Songliao Basin and correlation with magmatism in adjacent region.
Keywords:Songliao Basin  Yingcheng Formation  Volcanic rocks  Zircon SHRIMP geochronology  Geochemistry
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