摘要
本文利用昆明盆地钻孔的粒度资料,分析了粒度频率曲线、粒度参数、概率累积曲线等粒度特征,探讨了昆明盆地第四纪沉积环境演变的过程。结果表明昆明盆地沉积物的频率曲线主要为单峰形态,双峰曲线在个别时期较集中。概率累积曲线均为两段式。平均粒径多介于5-7Ф之间。四分位离差值多在0.6-1.4之间。偏度多属于正偏,只有少数为负偏。峰态值主要集中在0.9-1.56范围之内。通过分析得出昆明盆地第四纪沉积环境模式：更新世早期为河流相—滨湖相;更新世中期为滨湖相—滨浅湖相—滨湖相—河流相;更新世晚期至今为河流相—滨湖相—滨浅湖相—滨湖相—河流相。
This paper, based on the grain size data of drilling cores in Kunming basin, analyzes the grain size trend curve, grain size parameters, possibility accumulative curve, discusses the evolution of the Quaternary. sedimentary environment in Kunming basin. The work reveals that the early Pleistocene is fluvial facies--lake facies, the middle Pleistocene is lake facies--shallow lake facies--lake facies--fluvial facies, and since the late Pleistocene is fluvial facies--lake facies--shallow lake facies--lake facies--fluvial facies.
出处
《资源与产业》
北大核心
2009年第5期126-130,共5页
Resources & Industries
关键词
昆明盆地
沉积环境
频率曲线
粒度参数
Kunming basin
sedimentary environment
frequency curve
grain size parameters
