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新近堆积黄土,是指全新世(Q_4)近期形成的黄土。因为全新世分早期和近期,所以都用Q_4~2来表示新近堆积黄土。 新近堆积黄土(以下简称Q_4~2)一词的提出,是近几年在生产实践中,反复认识才被确认的。 Q_4~2黄土的成因类型,以坡积、洪积为主,其次为冲积、洪积-坡积及洪积-冲积。主要分布在河漫摊、低级阶地、山间洼地、洪积扇、坡积地带以及黄土塬、梁、峁的坡底等处。岩性为灰、褐黄、黄褐、
The recent accumulation of loess is the loess formed recently in the Holocene (Q_4). Because of the early and recent Holocene, Q4 ~ 2 are used to represent newly-accumulated loess. The recent accumulation of loess (hereinafter referred to as Q_4 ~ 2) put forward the word in recent years in production practice, repeated recognition was confirmed. The genetic types of loess Q_4 ~ 2 are mainly slope and flood, followed by alluvial, alluvial-ravine and alluvial-alluvial. Mainly distributed in the river diffusers, low-grade terraces, mountain depressions, alluvial fan, slope plot zone and loess plateau, beam, 峁 slope at the bottom and so on. Lithology is gray, brown yellow, yellow brown,