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ling ren kun huo de shen hai chen ji wu
Author(s): 
Pages: 19
Year: Issue:  6
Journal: Ocean World

Keyword:  浮游生物石灰岩喀斯特地貌放射虫有孔虫沉积速度弱酸性水广西桂林深海沉积物地球磁场;
Abstract: <正> 在我国,大约有七分之一的土地是石灰岩。石灰岩被弱酸性水经过漫长岁月的溶蚀,从而形成溶岩地貌(旧称喀斯特地貌),其最壮观的有我国广西桂林的峰林,以及云南路南的石林。据说,石灰岩的90%是由海洋中的有孔虫、放射虫、硅藻等浮游生物的遗骸(石灰质硬壳)沉积而成的。不过,其沉积速度相当
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