摘要
古近纪之后 ,强烈的构造运动在腾冲形成数个新生代湖盆 ,成为硅藻生存场所。上新世～全新世强烈火山活动为硅藻繁殖提供丰富的物质条件 ,该期的冰期较冷气候为硅藻提供适宜生存的低温冷水条件 ,相对平静的湖湾部位是硅藻大量繁殖和遗赅稳定掩埋的良好场所。这些地质构造、古水文、古气候是硅藻土矿床形成的必要条件。
In Tengchong,the diatom was occurred in several Cenozoic lake basin formed by the intensive structural movement after Eogene.The intensive volcanism in Pliocene-Holocene provided the development of diatom with abundant material conditions.The cold weather of ice period was suitable for the diatom existence.And the still gulf is the good place of tremendous reproduction and stable bury of diatom.These geological structure,palaeohydrological and palaeoclimatical conditions are the prerequisite for diatom deposit.
出处
《云南地质》
2003年第4期418-425,共8页
Yunnan Geology
