Sample records for 晶粒大小 (grain size)
from WorldWideScience.org

Sample records 1 - 3 shown.



1

陕西老高川红粘土剖面粒度磁化率特征及古环境意义 Characters of grain-size and susceptibility of the Neogene Laogaochuan red clay section, Shaanxi, and its paleoenvironment significance

Liu YanLin;Yue LePing;Pa LaDi(刘艳霖)

陕西老高川红粘土剖面粒度表现出明显的三峰分布特征,说明它是由多种成因组分所构成,而且每种成因组分对整体的贡献率也不同。其粒度组成主要是以粉土粒级(5-50μm)为主,且10-50μm粒级含量高于5-10μm,〉250μm颗粒少见。除〈2μm粒级含量变化相对稳定外,其余粒级均表现出旋回起伏的特征。〉63μm、〉30μm及中值曲线变幅较大,说明当时冬季风比较盛行,而且变化强度比较大,而〈2μm粒级曲线变化相对稳定,说明当时夏季风很弱,而且没有太大变化。粒度曲线与野外岩性所得结论一致,说明当时气候总体上是以干冷为背景,但也有干冷与暖湿的交替。野外岩性上表现为粘土层与钙结核层相互交替,粒度曲线上表现为...

DRIVER (Chinese)

3

Pollen record and environmental evolution of Caotanhu wetland in Xinjiang since 4550 cal. a BP

ZHANG, Yun; KONG, ZhaoChen; NI, Jian; YAN, Shun; YANG, ZhenJing

[英文摘要]: This paper presents a multi-proxy reconstruction of the climate change in Caotanhu wetland using pollen, phytolith and charcoal records, and the data of loss of ignition (LOI), grain size analysis, and susceptibility. Results reveal that between 4550 and 2500 cal. a BP, a dry climatic...

DRIVER (Chinese)