We report microtektites recovered from a large area of the deep seafloor (Central Indian Ocean) that appear to have undergone aerodynamic distortion during re-entry into the atmosphere. Considering the geographic locations, stratigraphic position and chemical compositions these glassy forms belong to the Australasian tektite strewn field. The microtektites are elongated to lengths of cms, sometimes flattened, bent, folded and fused at both ends suggesting that this side could have been the Earth-facing side during the re-entry. The presence of flow lines and distortional features are indicative of high atmospheric pressures experienced by the microtektites. The location where these microtektites were recovered constitute distal ejecta, and the shape distortion, that occurred during re-entry of the ejecta, seems to have affected only a few amongst the extensive collection of microtektites. Most of the specimens contain lechatelierite inclusions and higher volatile oxides, which are indicative of incomplete homogenization after melting and lower temperatures of formation vis-à-vis other specimens at the same location. The element distribution patterns in aerodynamically distorted microtektites suggest that ablation was similar to normal spherical tektites in which volatile elements are preserved. In contrast, aerodynamically ablated forms of Australasian ejecta show skin melting where thin layers of the anterior portions of samples flow back giving rise to the familiar button shapes. Our observation of delicate, elongated, flattened, and viscously deformed specimens is perhaps the first to imply that at the distal end of ejecta, each spot in the specimens has undergone different levels of trajectories, heating and ablation. These investigations could have implications to understand ejecta emplacement characteristics on planetary surfaces that contain appreciable atmospheres such as Mars and Venus.

我们报道了从大面积深海底（中印度洋）中发现的微晶岩，这些微晶岩在重新进入大气层时似乎发生了空气动力学变形。考虑到地理位置，地层位置和化学成分，这些玻璃状形态属于澳大利亚的陨石散布场。微晶岩拉长到几厘米，有时两端变平，弯曲，折叠和融合，这表明在重新进入地球的那一面可能是面向地球的一面。流线的存在和变形特征表明微晶陨石经历了很高的大气压。这些微晶石的回收位置构成了远端射出物，并且在射入物再次进入时发生了形状变形，似乎只影响了广泛的微晶岩中的极少数。大部分标本都含有丝锌矿夹杂物和较高的挥发性氧化物，这表明熔融后均质化不完全，并且相对于同一位置的其他标本而言，其形成温度较低。空气动力学变形的微晶陨石中的元素分布模式表明，烧蚀类似于保留了挥发性元素的普通球形陨石。相反，空气动力学消融的澳大拉西亚射出形式显示出皮肤融化，其中样品前部的薄层回流，产生了熟悉的纽扣形状。我们观察到的细腻，拉长，展平和粘性变形的标本可能是第一个暗示在弹出端的远端，样本中的每个点都经历了不同水平的轨迹，加热和烧蚀。这些研究可能对理解包含火星和金星等可观大气的行星表面上的喷射器安置特征具有启示意义。