滇东北会泽县鲁纳地区宣威组沉积相分析

HE SEDIMENTARY FACIES ANALYSIS OF XUANWEI FORMATION IN LUNA AREA OF HUIZE,NE YUNNAN

滇东北会泽鲁纳地区鲁纳宣威组(P_(3)x)主要为陆源碎屑沉积,岩石类型包括砾岩、长石岩屑砂岩、岩屑杂砂岩、粉砂岩、粉砂质泥岩、泥岩等,通过野外地层剖面岩石、沉积构造观察和室内综合对比研究,确定该区域的宣威组(P_(3)x)为扇三角洲沉积,可细分为扇三角洲平原和扇三角洲前缘2个亚相。整个宣威组(P_(3)x)沉积显示其沉积水体较浅、气候温暖湿润。

Luna Xuanwei Formation(P_(3)x)in Luna area of Xuanwei,NE Yunnan is mainly the continen-tal clastic sediment.The rock type includes conglomerate,feldspar debris sandstone,debris greywacke,silt-stone,silty mudstone,mudstone,etc.According to the field observation of rock,sedimentary structure of stratigraphic section and indoor comprehensive correlation study,we have determined that Xuanwei Formation(P_(3)x)is the fan delta sediment,which can be divided into 2 subfacies of fan delta plain and fan delta front.The whole Xuanwei Formation(P3 x)sediment shows the water environment is shallow,the climate is warm and moist.