火星表面陨石坑的碎形特征  

Fragmentation of meteorite pits on Mars' surface

作　　者：栾锡武[1] 黄海[1] 

机构地区：[1]中国科学院海洋研究所,青岛266071

出　　处：《地球物理学进展》2004年第1期137-142,共6页Progress in Geophysics

基　　金：国家自然科学基金项目(40006004)号;科技部国际合作项目和973项目(G200004670303)联合资助.

摘　　要：　对2004年1月5日美国宇航局发布的火星轨道探测器拍摄的勇气号着陆点照片进行了研究,认为照片上的地形为陨石撞击火星表面留下的痕迹.详细计量了照片上陨石坑的数目和尺度.对陨石坑尺寸和数目之间的关系进行了研究.认为,火星陨石坑的分布具有碎形特征,并符合分形分布,分维数为1.7.和地球上其它岩石破碎相比,分维数较低.我们推测,撞击火星的陨石可能来源于同一块岩石的破碎,并且该岩石的破碎程度较低.其破碎过程应该和断层、断裂、节理以及风化等地质过程引起的破碎不同.Surface picture of Mars token by orbit robot was issued by NASA in January, 2004. the picture was carefully studied by this paper. The paper points out that circle topography on the Mars' surface were meteorite pits. The pits dimension and number and its relationship between them was studied. The result shows that the relationship between the dimension and number of pits is fragmentation and fractal, its fractal dimension is 1.7, that is relatively small comparing to the rock fragmentation on the earth. The paper point out that it is probably all the meteorite hit the Mars were come from one rock that broken out later to form the numerous meteorites and the fragment degree is lower and the fragment process may deferent from the fragment caused by fault, rupture, texture, weathering on our earth.

关 键 词：火星 轨道照片 陨石坑 碎形 

分 类 号：P313[天文地球—固体地球物理学]