准噶尔盆地中晚侏罗世火山事件沉积初探  

A Pilot Research on the Volcanic Event Deposits in the Junggar Basin in the Middle and Later Jurassic

作　　者：曹远远 陈飞[1] 帕尔哈提·祖努 曹小红[1] 孟和 Cao Yuanyuan;Chen Fei;Paerhati·Zunu;Cao Xiaohong;Meng He(Xinjiang Institute of Engineering,Urumqi,Xinjiang,830023,China)

机构地区：[1]新疆工程学院,新疆乌鲁木齐830023

出　　处：《新疆地质》2020年第1期32-34,共3页Xinjiang Geology

摘　　要：准噶尔盆地中晚侏罗世火山事件在齐古组、头屯河组形成凝灰岩、凝灰质砂岩夹层,横向上不稳定,在东北缘西山窑组内形成玄武岩、凝灰岩。火山活动具多期次特征,喷发中心位于五彩湾一带。五彩湾地区中晚侏罗世火山岩经蚀变、水解、脱玻化作用形成大型沸石、膨润土矿床,该火山事件与本区硅化木的形成在时空上具有高度相关性,可能提供硅质来源。五彩湾一带火山喷发事件与盆地中新生代砂岩中分布中晚侏罗世岩浆锆石有较好的对应,可能提供部分物源。Abstraet:The volcanic event deposits in the Qigu Formation and Toutunhe Formation of middle-late Jurassic are widely distributed in Junggar Basin.The volcanic deposits,such as tuff,tuffite and similar sediments,are interbedded in the terrestrial clastic rocks.The distribution and thickness of the volcanic event layers varies,Basalt and tuff are found in the middle Jurassic Xishanyao Formation in the northeastern margin of the Junggar Basin.The eruptive center is located in the Wucaiwan.The volcanic eruptions has the characteristics of multi-stages.The volcanic ejecta of middle-late Jurassic is altered into zeolite and bentonite by devitrification and hydration in Wucaiwan.There is a spatial-temporal relation between the volcanic event of late Jurassic and silicified woods formation,the source of silicon may be supplied by volcanism.It appears that magmatogenic zircons in late Jurassic-Cenozoic sandstone in Junggar Basin are related to the volcanic event in Wucaiwan.

关 键 词：准噶尔盆地 侏罗纪 沸石 膨润土 硅化木 

分 类 号：P534.52[天文地球—古生物学与地层学] P588.14[天文地球—地质学]