摘要:
我们利用美国陆地卫星第1、2、3号(LANDSAT~1、2、3)的多光谱黑白扫描片123张,在华北136万平方公里面积,目视解译出了各类线性破裂4737条,发现大量破裂的交汇点,长度和组数因地而异,地震活动、地热、新生代岩浆活动以及深源岩矿等与之密切相关。本文通过简便方法,对上述三项破裂特征进行统计、编图和初步分析后,拟定了一项半定量指标,即用地壳线性破裂的密度梯度来解释以上地质现象同构造破裂的关系,并认为华北地台的一些地区正在被新破裂分割。
Abstract:
In this paper,the author used 123 Photoes from LANDSAT-1,2,3,which covered 1.36 million km2 of the North China Region and then interpreted 4737,linear fractures of several kinds.we discovered that a lot of interse cted points of the linear fractures,the length of the linear fractures,and the number of the trending of the intersected groups are quite different in North China.The seismicities,geotherm,Cenozoic magma activities,and the deep source rocks are strongly related to the three characteristics of the linear fractures as mentioned above.The author applied a simple and convenient method to the statistics,mapping and preliminary analysis.A semi-quantitative quota had been worked out,that is,the density gradient of the crustal line ar fractures,which can interpret the relationship between the geological pb enomena as described above.The author believes that the new fractures occu rring recently in some regions of the North China platform result from the phenomena.
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