准噶尔盆地乌尔禾地区二叠系风城组盐类矿物和成因分析  

SALT MINERALS AND THEIR GENESIS OF THE PERMIAN FENGCHENG FORMATION IN URHO AREA,JUNGGAR BASIN

作　　者：蒋宜勤[1,2] 文华国[3] 祁利祺 张锡新 李云[3] 

机构地区：[1]西北大学地质学系,陕西西安710069 [2]新疆油田公司实验检测研究院,新疆克拉玛依834000 [3]油气藏地质及开发工程”国家重点实验室,成都理工大学,四川成都610059

出　　处：《矿物岩石》2012年第2期105-114,共10页Mineralogy and Petrology

基　　金：国家自然科学基金项目(批准号41002033)

摘　　要：二叠系风城组为准噶尔盆地乌尔禾地区重要的勘探层系,也是成因非常特殊的深湖相含盐火山-沉积建造。通过14口钻井岩心观察,296片薄片鉴定,30块扫描电镜和28件X衍射等分析技术手段,较为详细地研究了风城组盐类矿物及伴生矿物的各项特征,识别出硅硼钠石、碳酸钠钙石、白云石等主要盐类矿物和硬石膏、石膏、玉髓、黄铁矿和蒙脱石等伴生矿物,确定风城组深湖相含盐火山-沉积建造与同期相间发生的火山喷发和湖底热液喷流活动有关,其成因可与酒西盆地下沟组湖相喷流岩和东非裂谷坦噶尼喀湖现代深湖底热液喷流沉积作用相类比,提出"深水湖盆热液喷流含盐火山-沉积建造模式"。In the Urho area of Junggar Basin,the Permian Fengcheng Formation is an important exploration stratam characterized by very special deep lake salt-bearing volcanic-sedimentary for- mation. Based on the core observation, thin section identification, scanning electron microscopy, X- ray diffraction and chemical analysis,a moredetailed study was made on the characteristics of the salt minerals and their associated minerals in the Fengcheng Formation. Salt minerals in the Fengcheng Formation consist of reedmergnerite, shortite, trona, ankerite and associated with an- hydrite,gypsum,chalcedony, pyrite and smectite. It was indicated that the Fengcheng Formation were related to the interphase volcanic eruption and lake hydrothermal exhalative activities in the same period. Their characters and genesis can be compared with the lacustrine exhalative rocks of Xiagou Formation in Jiuxi Basin and the modern deep lacustrine hydrothermal exhalative deposi- tion in Tanga Nika Lake, East African rift Valley. Accordingly, a hydrothermal exhalative salt- bearing volcano-sedimentary mode in the deep lake basin was proposed in the paper.

关 键 词：准噶尔盆地 乌尔禾 二叠系 风城组 盐类矿物 湖相喷流岩 

分 类 号：P588.21[天文地球—岩石学]