摘要
冕宁冶勒地区，分布着较大面积的新生代地层，通过野外填图、实测剖面，以及采获的孢粉化石，划分出了昔格达组及Ⅰ～Ⅴ级阶地，并建立了冶勒地区四个孢粉组合带。结合同位素地质年龄，区域对比分析，确认昔格达组属上新世至早更新世沉积。区内Ⅱ～Ⅴ级阶地为更新世堆积，Ⅰ级阶地为全新世堆积。
The Cenozoic is distributed over Yele,Mianning,Sichuan.The Xigeda Formation and terrace Ⅰ-Ⅴ are defined and four Cenozoic sporopollen assemblage zones are established by geological mapping,measuring geological section and attained sporomorph.Isotopic dating and regional stratigraphic correlation indicate that the Xigeda Formation is Pliocene-Early Pleistocene sediment.The Pleistocene sediment is distributed over terrace Ⅱ-Ⅴ and the Holocene sediment is distributed over terrace Ⅰ. Paleoclimate is analysed.
出处
《四川地质学报》
1998年第1期22-27,共6页
Acta Geologica Sichuan
关键词
冶勒地区
新生代地层
孢粉组合带
古气候
Cenozoic stratigraphy,sporopollen assemblage zone,Paleoclimate,Yele region
