内蒙古海拉尔发现陨石坑及科研意义

陨石撞击构造研究是天文地质学研究的热点,但是缺乏典型的研究基地,海拉尔陨石坑的发现,无疑是一个重要补充。海拉尔陨石坑坑区基础岩石为晚侏罗世火山岩,区域自然地理为平缓丘陵山地草原,陨石坑呈封闭圆形,中间筒状突起显示冲击锥地貌,直径320m,坑底到坑缘最大高差10m。为了保护性研究,没有进行进行破坏性取样分析撞击岩石矿物,根据排他比较分析法,认为该坑唯有陨石撞击成因可以解释,并且具有最关键的冲击锥地貌特征。这是一个我国唯一保存完整的可供直观参观的陨石坑,估计该陨石坑年龄应该在100万年以上。

THE HAILAR METEORITE CRATER AND ITS SCIENTIFIC SIGNIFICANCE

The research on Meteorite impact structure is a hot spot of astrogeology.For lacking of typical research bases,the Hailar meteorite crater is undoubtedly an important complement.Late Jurassic volcanic rocks compose the foundation rocks in the pit and gentle hills and mountain steppes constitute the natural geographic landforms of the area.The crater is a closed circle with the diameter of 320m and the highest height difference is 10m.Besides,alluvial cone can be seen from tubbiness protuberance in the center.As a protective research,no sampling analysis is conducted.According to the exclusive and comparative analysis,only the meteorite impact can explain the formation of the pit,which has a most critical geomorphology—the alluvial cone.The meteorite crater,estimated to be more than 100 million years,is the only one which is preserved intact and available for a visual visit in our country.