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松辽盆地北部营城组三段火山岩喷发特征及其时限厘定——以徐深1-2井为例

发表时间:2013-11-15  浏览量:949  下载量:274
全部作者: 章凤奇,陈汉林,余星,庞彦明
作者单位: 浙江大学地球科学系;国家海洋局第二研究所;大庆油田有限责任公司勘探开发研究院
摘 要: 以松辽盆地北部营城组三段火山岩取芯最长、最完整的徐深1-2井岩芯为对象,建立了火山岩岩性、岩相喷发序列,并利用锆石SHRIMP定年技术对其喷发时限进行了厘定。研究表明:营城组为一套流纹质的酸性火山岩组合,先后经历了爆发、喷溢、再爆发的建造过程。测年结果表明:该套火山岩主体喷发时限介于早白垩世109~113 Ma之间,是松辽盆地晚中生代最后一期大规模的酸性火山活动记录。
关 键 词: 火山学;火山喷发特征;锆石SHRIMP U-Pb定年;营城组;松辽盆地
Title: Erupted characteristics and time of the volcanic rocks of the 3rd member of the Yingcheng formation in the northern Songliao basin: a case study from the well Xushen 1-2
Author: ZHANG Fengqi, CHEN Hanlin, YU Xing, PANG Yanming
Organization: Department of Earth Sciences, Zhejiang University; Second Institute of Oceanography, State Oceanic Administration; Research Institute of Petroleum Exploration and Development, Daqing Oilfield
Abstract: The well Xushen 1-2, located in northern Songliao basin, has the longest length of cores and highest recovery rate in drilling of the Yingcheng volcanics. Volcanic petrography and facies and dating studies have been conducted on the cores of Xushen 1-2. This study showed that this volcanic succession was composed of rhyolitic volcaniclastic rocks and rhyolites, which had experienced the erupted process of explosion, overflowing and re-explosion. Dating results indicated that all the volcanic rocks formed at the period of 109~113 Ma in the early Cretaceous, which is considered to be the last large-scale acidic volcanic activity in the Songliao basin during the late Mesozoic time.
Key words: volcanology; volcanic erupted characteristics; zircon SHRIMP U-Pb dating; Yingcheng formation; Songliao basin
发表期数: 2013年11月第21期
引用格式: 章凤奇,陈汉林,余星,等. 松辽盆地北部营城组三段火山岩喷发特征及其时限厘定——以徐深1-2井为例[J]. 中国科技论文在线精品论文,2013,6(21):2025-2040.
 
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