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本文根据地质、地貌、新构造运动的资料,讨论了红河断裂带的地质构造特征,着重于新生代的活动性。认为红河断裂是一条新生代作右旋水平运动为主的走向滑动断层。其两侧断块在新生代以不同方式和方向经受了强大的剪切应力作用。哀牢山断块向北东方向的逆冲上隆形成狭长状第三纪挤陷盆地。红河断裂的水平右旋运动,形成雁行状排列的新断裂,与红河断裂构成“入”字型构造。红河断裂在新生代最大错距达6公里,由北西向东南错距逐渐减小。本文认为,红河断裂结构单一。第三纪至现今活动中心由南东向北西迁移。现今危险地段是大理、下关一带。弥渡盆地以南,断裂活动以蠕滑形式释放能量。(编者按:该结论与本刊本期所载“中美地震工作者对红河断裂的最新研究”报导的结论不同,供读者鉴别。这类予测,有待受大自然的检验。) 红河断裂带在地质构造上的重要位置,早为广大地学工作者所重视,但其地质研究程度仍比较低。1981年,笔者对红河断裂带进行了地震地质调查,本文从构造活动和发展的角度,就红河断裂带的地质构造特征、新生代的活动型式、地震活动的构造条件进行初步探讨。本文涉及范围北起弥渡苴力(E 100°35′,N 25°13′),南至河口新街(E 103°36′,N22°49′)。曾有文献称之为“元江断裂南段”,本文称之为“红河断裂带”。
Based on the data of geology, geomorphology and neotectonic movement, this paper discusses the geological tectonics of the Honghe fault zone and focuses on the activity of the Cenozoic. It is considered that the Honghe fault is a strike-slip fault dominated by the Cenozoic dextral horizontal movement. The fault blocks on both sides have undergone strong shear stress in different ways and directions during the Cenozoic. Ailaoshan uplift to the northeast direction of the uplift to form narrow-shaped Tertiary squeeze basin. The horizontal movement of the Red River fault dextralizes the formation of new faults arranged in geese and forms the “inflow” structure with the Honghe fault. The Red River fault in the Cenozoic maximum error of up to 6 km, from northwest to southeast offset gradually reduced. This paper argues that the Honghe fault has a single structure. Tertiary to modern activity center from south to north to west migration. Dangerous lots today is Dali, Shimonoseki area. South of the Midu Basin, fault activity releases energy in the form of creep. (Editor’s note: This conclusion is different from the one reported in this issue of “Recent Studies by Hong Kong and China Seismologists on the Honghe Fault,” for the reader’s identification.) Such predictions are subject to nature’s tests.) The Red River fault Belt in the geological structure of an important position, as early as the majority of geoscientists attach importance, but its degree of geological research is still relatively low. In 1981, the author conducted an earthquake and geological survey of the Honghe fault zone. From the perspective of tectonic activities and development, this paper discusses the geological structural features of the Honghe fault zone, the Cenozoic activity patterns and the tectonic conditions of seismic activities. This paper covers the range of Medellin forces north (E 100 ° 35 ’, N 25 ° 13’) and south of Estuary (E 103 ° 36 ’, N 22 ° 49’). Literature has been called “the southern section of the Yuanjiang fault”, this article called “the Red River fault zone.”