辽西黑水地区白垩系孙家湾组上段沉积相及其演化  

Sedimentary facies and evolution of the upper member of Cretaceou Sunjiawan formation in Heishui area of western Liaoning

作　　者：赵忠华[1,2] 席海银 陈德兵[2] 王黎明[2] 饶明辉[3] 

机构地区：[1]东北大学,辽宁沈阳110004 [2]核工业240研究所,辽宁沈阳110032 [3]东华理工大学,江西抚州344000

出　　处：《铀矿地质》2010年第4期208-214,共7页Uranium Geology

摘　　要：黑水地区孙家湾组上段可划分为3个亚段,主要为冲积扇相,宏观上分为近端砾质辫状平原、远端砂质辫状平原、扇前洪泛平原3个亚相,进一步细分为泥石流、砾质辫状河道、砾质坝、砂质辫状河道、砂质坝、洪泛细粒、泥炭沼泽沉积等微相。孙家湾组上段第1亚段为在干旱-潮湿过渡气候下形成的退积型旱地扇沉积;第2亚段为在潮湿气候下形成的退积型湿地扇沉积;第3亚段为在潮湿气候下形成的进积型湿地扇沉积。黑水地区孙家湾组经历了早期退积型的干旱扇、中期退积型的湿地扇和晚期进积型的湿地扇的演化过程。The upper member of Sunjiawan formation in Heishui area is mainly alluvial fan facies.From the macroscopic view,alluvial fan facies can be divided into three sub-facies of proximal end gravel braided plain,distal end gravel braided plain and pre-fan flood-plain and further into some micro-facies of debris flow,gravel braided channel,gravel dam,flood-fine and peat bog etc.The upper member of Sunjiawan formation could be divided into three sub-members.The first sub-member is retrograding dryland type fan sediment under drought-humid climate.The second sub-member is retrograding wetland type fan deposit under humid climate.Third sub-member is progradational wetland type fan sediments under humid climate.Sunjiawan formation in Heishui area experienced three evolutionary stages：the early retrograding dryland type fan deposition,the medium term retrograding wetland type fan deposition and the later progradational wetland type fan.

关 键 词：黑水地区 孙家湾组 沉积相 冲积扇 

分 类 号：P512.2[天文地球—地质学]