Preliminary SEM Study of Quartz Surface Features from Lingtai Section and its Palaeoclimatic Significance

doi:10.7523/j.issn.2095-6134.2002.1.008

Abstract

Abstract:

We studied the surface features of the quartz grains of the red clay loess deposits from Lingtai,Chinese Loess Plateau,and found that there are no significant differences between the quartz grains from the red clay and from the loess palaeosol layers.All of the samples displayed a similar assemblage of both the freshly crushed features and pits obtained from the collisions of grains during the wind transportation.We think that the red clay formation has a similar origin with the loess palaeosol deposits:the denudation of the plateau (maybe with the process of frost weathering) provides a large amount of silt material,then the northwestern winds blow them to the loess plateau hundreds kilometers away.The combination of the surface features shows that four transitions occurred during the last～7.0 Ma,～4.2～5.0 MaB.P.,～3.6 MaB.P.,～2.6MaB.P.and ～0.9 MaB.P.respectively.This may be related to the phasic uplift of the Tibetan Plateau.

Key words: quartz, loess, red clay, Lingtai, surface features

CLC Number:

P532

HOU ShengShan. Preliminary SEM Study of Quartz Surface Features from Lingtai Section and its Palaeoclimatic Significance[J]. , 2002, 19(1): 59-68.

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