水下扇岩相特征及形成机制  

Submarine Fans： Characterristics of Rock Facies and Mechanisms of Deposition

作　　者：孙连浦[1] 刘招君[1] 李本才[2] 董清水[1] 朱建伟[1] 吴邦昊[3] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]吉林油田公司勘探开发研究院,吉林松原138001 [3]辽河石油勘探局地质录井公司,辽宁盘锦124010

出　　处：《世界地质》2001年第3期249-256,共8页World Geology

摘　　要：２０世纪５０年代初期以来，沉积物重力流研究得到沉积学家们的广泛重视，特别是自６０年代末期，与沉积物重力流密切相关的水下扇研究成为沉积学领域的热点。通过对国内外大量沉积物重力流及水下扇研究成果的总结，结合我国中新生代陆相断陷盆地水下扇发育的特点，将水下扇的组成岩相划分为基质支撑砾岩相、颗粒支撑砾岩相、砾质砂岩相、块状砂岩相、经典浊积岩相。水下扇的形成机制系重力流成因。内扇以杂基支撑、颗粒支撑砾岩组合为特征；中扇以砾质砂岩、块状砂岩组合为特征；外扇以ＣＤＥ序及ＤＥ序经典浊积岩发育为特征。From the early days of 50s, 20th century, sediment gravity flows have been rec-ognized widely by sedimentologists ,especially from the end of 60s,submarine fan related nearly to sediment gravity flows has been the hotspot of sedimentology field. Through the summary of a large of research accompliments of sediment gravity flows and submarine fan China and abroad, integrated with the development characteristics of submarine fan in Cenozoic - Mesozoic rupture basins China, rock facies of submarine fan are classified into matrix cement conglomer-ate rock, grain surported conglomerate rock, conglomerate - sandstone, massive sandstone and classical turbidite. The formation of submarine fan related to sediment gravity flows. The char-acteristics of inner fan is combination of matrix cement conglomerate rock and grain supported conglomerate rock, middle fan is combination of conglomerate - sandstone and massive sand-stone,outer fan is classical turbidite.

关 键 词：水下扇 沉积物重力流 浊积岩 水动力学机制 新生代 陆相断陷盆地 形成机制 

分 类 号：P588.2[天文地球—岩石学]