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shan xi sheng da tong huo shan qun huo shan sui xie chen ji te zheng
Author(s): 
Pages: 151-157
Year: Issue:  S1
Journal: Acta Sedimentologica Sinica

Keyword:  火成碎屑浮岩粒级山西省大同;
Abstract: 本文对大同火山群火成碎屑沉积物的空中坠落沉积和碎屑流动沉积(陆上和水中)的横向变化和垂向变化及组合进行了探讨性研究,进而发现空中坠落沉积物在垂向上具有成层性,横向上沉积物的粒度和厚度随远离火山口的距离呈有规律的减小,但流动沉积物中浮岩粒级是颠倒的,细粒沉积物一般在距火山口很远处形成,但也有在火山口附近沉积的,这与火山喷发强弱有关,可见粗粒的坠落沉积物是近火山口的可靠指标,但细粒沉积物并不一定表示远离火山口。
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