The Significance and Establishment of Discriminant Functionwith Grain Size of Stable Lacustrine Sediment and Eolian Loess
-
摘要: 沉积物粒度变化主要受搬运介质、搬运方式、沉积环境和气候等多种因素的控制,通过粒度分析可判别沉积物的成因类型,推断其形成的沉积环境,解释环境演变。利用统计学方法对典型稳定湖相沉积物(罗布泊湖相样品282块,岱海湖相样品123块)和典型风成黄土(甘肃兰州榆中样品263块)粒度参数进行定量化分析,并经稳定湖相和风成沉积物验证,获得稳定湖相与风成沉积物的判别公式:F(湖相、风成沉积物) =20.363Mz-56.371Sd-67.922Sk+23.516Kg-55.626,若F>0,为稳定湖相沉积物,反之,F<0,则为风成沉积物。这为研究地史中稳定湖泊与风成环境
沉积物的鉴别提供粒度分析定量化判别方法,它对陆相古环境、干旱化事件和尘暴事件等研究具有十分重要的借鉴价值。Abstract: Changesinsedimentgrainsizearemainlycontrolledbythetransportingmedium,transportingmode,dep
ositionalenvironment,climateandotherfactors.Throughanalyzingcharacteristicofgrainsize,typesofsedimentscan
bedistinguished,andthatcharacteristicofthesedimentaryenvironmentcanbeconcluded,environmentalevolution
canbeinterpreted.Inthispaper,thesamplesincludetypicalstablelacustrinesediments(282lacustrinesediment
samplesfromLopNur,123lacustrinesedimentsamplesfromDaihai)andtypicaleolianloess(263samplesfrom
Lanzhou).Thegrainsizecharacteristicparametersofthesesamplesareobtainedwithmomentmethod.Thisarticle
quantitativeanalyzestheseparametersbymeansofdiscriminatoryanalyticalmethod.Andthenobtaineddiscriminant
functionofstablelacustrinesedimentsandtypicaleoliansediments:F(lake,eoliansediment)=20.363Mz56.371Sd
67.922Sk+23.516Kg55.626,ifF>0,thesedimentisstablelacustrinesediment;ifF<0,thesedimentiseolian
sediment.Thisisagoodquantitativeanalysistothestablelacustrinesedimentsandeoliansedimentsofgeologicalhis
tory,aswellasabasisfordistinguisheoliancomponentsfromthesequenceofpaleolacustrinesediments.Anditis
significantfortheinvestigationofterrestrialpaleoenvironments,droughteventsandduststormevents-
Key words:
- stablelacustrinesediment /
- eolianloess /
- analysisofgrainsize /
- discriminantfunctio
-

计量
- 文章访问数: 3314
- HTML全文浏览量: 17
- PDF下载量: 2019
- 被引次数: 0