摘要
川东华蓥山断裂带附近飞仙关组一段发育大量同生变形构造。通过野外剖面和岩心观察分析,认为液化岩脉、重力断层、刺穿层理、肠状构造、火焰构造及卷曲变形构造等同生变形构造为震积成因。震积作用沉积可分为原地震积岩(A)、震积—海啸岩(B)和背景沉积(C)三个单元,其中A单元包括液化碳酸盐岩脉(a)、震褶岩(b)、震裂岩(c),发育a-b-c(A1)和b-c(A2)两种组合。飞一段各震积单元组成A1-B-A2-C沉积序列。结合对区域构造背景的分析,认为震积岩的发育与华蓥山断裂带的阶段性活动有关,华蓥山断裂带强烈活动诱发地震是飞一段震积岩形成的动力机制。
Syndepositional deformation structures were well developed in the Fei 1 Member nearby the Hua Yingshan fracture belt in the eastern Siehuan Basin. Based on studies of regional tectonic setting and observation of geologic cross-sections and drilling cores, it is concluded that these structures, such as liquefied vein, gravity fault, bedding phenomenon, enterolithic structure, flamme structure, convolute beddings were mainly produced by seismic liquefaction. According to recognition marks and combination characteristics, seismic sedimentary process can be divided into autochthonous seismite （A） , tsunamite （ B ） and background deposit （ C ） units, of which unit A consist of liquefied vein （ a）, seismic corrugated rock （b） and shattering rock, which are associated into two types of associations ： a-b-c （A1 ） and b-c（A2 ）. The sedimentary sequence of seismite of the Fei 1 Member in the eastern Siehuan Basin is A1-B- A2-C. Combining with the cognizance of regional tectonic setting, it indicates that the seismite is in connection with the Hua Yingshan fracture belt, and the seismic activities due to the activities of the Hua Yingshan fracture belt provided dynamics for the developing of seismite of the Fei 1 Member in the eastern Sichuan Basin.
出处
《沉积学报》
CAS
CSCD
北大核心
2009年第5期1012-1017,共6页
Acta Sedimentologica Sinica
基金
中国石油中青年创新基金(06E1018)
四川省重点学科建设项目(SED0414)
关键词
沉积序列
识别标志
震积岩
飞一段
川东地区
sedimentary sequence, recognition mark, seismite, Fei 1 Member, Eastern Sichuan Basin
