准噶尔盆地南缘坡缕石矿物学特征及古气候指示意义  

Mineralogical characteristics of palygorskite in the southern margin of Junggar Basin and their implications for paleoclimate

作　　者：王明振[1] 吴朝东[1,2] 房亚男[1] 王陆新[1] 李林林[1] 陈榕[1] 王军[1,2] 

机构地区：[1]造山带与地壳演化教育部重点实验室,北京大学,北京100871 [2]北京大学石油与天然气研究中心,北京100871

出　　处：《岩石矿物学杂志》2013年第6期833-841,共9页Acta Petrologica et Mineralogica

基　　金：国家科技重大专项(2011ZX05009-001)

摘　　要：为深入研究准噶尔盆地南缘新生界古气候演化过程,采用X射线衍射(XRD)和扫描电镜(SEM)等手段对准噶尔盆地南缘(准南)新生界地层泥岩、砂岩中粘土矿物成分、坡缕石矿物学特征进行了系统分析。分析结果表明,新生界泥岩中粘土矿物组成主要有蒙脱石、伊利石、坡缕石和绿泥石等;坡缕石是指示干旱-半干旱气候条件的特征矿物,呈纤维状、束状等形态,其形态及与周围矿物的接触关系说明坡缕石为典型自生成因,坡缕石、伊利石、绿泥石构成的粘土矿物组合所反映的干旱气候与地层颜色变化相吻合。In order to further investigate paleoclimate evolution of Cenozoic period in the southern margin of Junggar Basin,the authors systematically analyzed mineral compositions and mineralogical characteristics of palygorskite of mudstones and sandstones in the southern margin of Junggar Basin by using X-ray diffraction （XRD） and scanning electron microscopy （SEM）.The results show that mineral compositions of Cenozoic mudstones are smectite,illite,palygorskite,kaolinite and chlorite.Palygorskite is indicative of an arid,semi-arid and strong evaporation environment.Fibrous or beam palygorskites identified by mineral contact relation are typically authigenic.The arid palcoclimate is consistent with the color change of strata reflected by illite and chlorite mineral assemblages.

关 键 词：坡缕石 矿物学特征 古气候 准噶尔盆地 

分 类 号：P588.2[天文地球—岩石学] P579[天文地球—地质学]