松辽盆地营城组火山岩冷却单元及地层结构分析  

Volcanic Cooling Unit and Analysis of Stratigraphic Architecture of Yingcheng Formation in Songliao Basin

作　　者：程日辉[1] 任延广[2] 沈艳杰[1] 许中杰[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《吉林大学学报（地球科学版）》2012年第5期1338-1347,1365,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40972074);国家'973'计划项目(2009CB219303)

摘　　要：火山岩冷却单元的识别是火山岩地层和岩相研究的重要环节。松辽盆地东南缘露头区和徐家围子断陷营城组火山岩剖面的剖析显示,冷却单元主要存在4种主要的单元类型:碎屑岩型、熔岩型、碎屑岩+熔岩型和熔岩+碎屑岩型。碎屑岩型和熔岩型是端元类型,分别反映蒸汽喷发和岩浆喷发的作用过程;碎屑岩+熔岩型是基本组合单元类型,反映蒸汽-岩浆喷发的连续作用过程;熔岩+碎屑岩型属于改造的或特殊机制的类型。冷却单元本身及其堆叠具有相的意义,是火山岩地层的基本成因地层单元,因此成为解释火山岩地层结构、了解形成与保存过程的重要基础。通过火山岩冷却单元识别与叠置分析,构建了松辽盆地徐家围子断陷营城组一段的地层结构。The reorganization of volcanic cooling unit is a key to analyze volcanic stratigraphy and litho-facies.The study of the sections of Yingcheng Formation in Songliao basin shows that there are four types of cooling unit including pyroclastic,lava,pyroclastic＋lava and lava＋pyroclastic in the outcrop of the southeast margin and Xujiaweizi fault depression.The type of pyroclastic is an end unit reflecting the processes of hydro explosion.The type of lava is another end unit reflecting the processes of magma effusion.The type of pyroclastic＋lava is a basic unit reflecting the consequent processes of hydro-magma eruption.The type of lava＋pyroclastic is a reformed or special unit.Cooling unit itself and its stacking contain meaning of litho-facies.The cooling unit is a genetic stratigraphic unit in volcanic stratigraphy,which is fundamental to learn architecture,forming and preservation of volcanic strata.The recognition of volcanic cooling units and analysis of superimposition give a stratigraphic architecture of the First Member,Yingcheng Formation in Xujiaweizi of Songliao basin.

关 键 词：火山岩地层 冷却单元 地层结构 营城组 松辽盆地 火山岩 

分 类 号：P618.13[天文地球—矿床学]