沙湾断裂带的基本特征及与地貌的耦合性分析  

The Basic Features of Shawan Fault and Analysis of the Coupling with the Landform

作　　者：董好刚[1] 

机构地区：[1]中国地质调查局武汉地质调查中心,武汉430205

出　　处：《华南地质与矿产》2016年第3期238-248,共11页Geology and Mineral Resources of South China

基　　金：中国地质调查局地质灾害预警项目"珠三角NW活动断裂调查评价"(编号:1212011014006)

摘　　要：沙湾断裂控制珠江三角洲东部边界。本文从断裂分布、露头特征、地震勘察和钻探验证等角度分析了沙湾断裂带的基本特征:沙湾断裂是由16组近北西向断裂组成的断裂带,晚中生代以来至少经历过四次较强的活动,第一期活动发生于古近纪红层沉积之后,为低角度逆冲运动;第二期为扭性或压扭性;第三期活动表现为高角度正断层,活动时间为距今约50万年;第四期活动表现为拉张环境,活动时间距今约6-10万年。断裂带周边特有的地貌与断裂分布和性质具有较强耦合性,本文结合断裂基本特征对耦合性的原因进行了分析,认为沙湾断裂的活动性等特征对地貌的形成具有一定的控制作用。Shawan fault control the eastern boundary of Pearl River Delta.The basic feature was studied from fracture distribution,outcrop characteristics, seismic exploration and drilling verification etc.It is composed of a set of NW-trending faults（16 faults）.Shawan fault has experienced at least four tectonic movements since late Mesozoic Era： First time,it behaved in a low angle thrust when the red beds formed after the Paleogene Period;The second time was in a shear or compress-shear way; The third stage which took place about 50 ka ago resulted in normal faults with steep fracture; the forth fault event was in extensional environment,which happened about 6-10 ka ago. The peculiar topography surrounding the fracture zone has strong coupling with fracture distribution and properties. The coupling causes were analyzed on the basis of features mentioned above, and the conclusion is that fault activity has certain effect on formation of landform.

关 键 词：珠江三角州 沙湾断裂带 基本特征 地貌 耦合性 

分 类 号：P931.2[天文地球—自然地理学]