地外撞击球粒的成因探讨──以K/T界面事件为例

THE ORIGIN OF EXTRATERRESTRIAL IMPACT SPHERULES──WITH THE REFERENCE TO KTB SPHERULES

本文对KTB地层中富含尖晶石的地外撞击球粒的成份、矿物组成、构造特点等进行了系统研究，通过陨石消熔模拟实验的分析，以及陨石消融成因模式和撞击汽云凝聚成因模式的对比研究，认为该类球粒在成因上既有消融成因的球粒，又有撞击汽云凝聚成因的球粒，并且可能同时存在另外一种成因机制的球粒．

The chemical, mineralogical,structural, morphological characteristics of KTB spinelbearing spherules,and the experimental results of meteorite ablation,are suggestive of that some of KTB spherules derived from projectile ablation debris,some from condensates of impact vapor.More than these,some KTB spherules are of the characteristics in compositions similar to that of condensates of impact vapor but in structures similar to that of projectile ablation debris suggesting that these spherules might be derived from another mechanism.