There are several reports of Australasian tektites found within a stratum called “laterite” layer widely distributed in Indochina. However, it has been debated whether these tektites are in situ or reworked. This uncertainty is because a detailed description of their field occurrence is lacking. Here, we describe the detailed occurrence of a cluster of tektite fragments recovered from the “laterite” layer near Huai Om, northeastern Thailand, and demonstrate the evidence of in situ occurrence of the tektites. At least 331 tektite fragments with a total weight of 713 g were found from a 40 × 30 cm area with 10 cm thickness in the uppermost part of the “laterite” layer. The very angular shapes and very poorly sorted nature of the fragments, restoration of larger tektite fragments into one ellipsoidal Muong Nong-type (MN) tektite mass, and the similar chemical composition of the fragments suggest that these MN tektite fragments represent a tektite mass that fragmented in situ. The fact that the fragments were found within the “laterite” layer is inconsistent with a previous interpretation that the upper surface of the “laterite” layer is a paleo-erosional surface, on which the tektites are reworked. The size distribution of the fragments is bi-fractal following two power laws in the range from 10 to 26 mm and from 26 to 37 mm, respectively, with fractal dimensions (Ds) of 2.2 and 7.5. The Ds for the coarse fraction of the tektite fragments is larger than the Ds for rock fragments generated by rockfalls and rock avalanches and similar to the Ds for the coarser fraction fragments generated by high-speed impact experiments, suggesting that the tektite fragments were formed through intense fragmentation by a relatively high energetic process. The occurrence of the fragments forming a cluster indicates that the fragments were not moved apart significantly after fragmentation and burial. Based on these results, we concluded that the mass of a tektite was fragmented at the time of the landing on the ground after traveling a ballistic trajectory and has not been disturbed further.

在印度支那广泛分布的称为“红土”层的地层中发现了澳大利亚的陨石。但是，关于这些陨石是否在原地还是经过重新加工一直存在争议。这种不确定性是因为缺少对其场发生的详细描述。在这里，我们描述了从泰国东北部怀俄姆附近的“红土”层中回收的一群陨石碎片的详细发生，并证明了原位发生这些陨石的证据。在“红土”层最上层的40×30 cm厚度为10 cm的区域中发现了至少331个总重量为713 g的陨石碎片。碎片的角度非常大，排序性质非常差，将较大的陨石碎片还原成一个椭圆形的Muong Nong型（MN）陨石块，碎片的化学组成相似，表明这些MN陨石碎片代表了就地碎裂的陨石块。在“红土”层中发现碎片的事实与先前的解释不一致，即“红土”层的上表面是古侵蚀表面，在该表面上重新加工了陨石。碎片的尺寸分布是双分形的，遵循两个幂定律，分别在10到26 mm和26到37 mm的范围内，分形尺寸为（在这些钛土上进行重做。碎片的尺寸分布是双分形的，遵循两个幂定律，分别在10到26 mm和26到37 mm的范围内，分形尺寸为（在这些钛土上进行重做。碎片的尺寸分布是双分形的，遵循两个幂定律，分别在10到26 mm和26到37 mm的范围内，分形尺寸为（DS和2.2和7.5。的Ds的用于熔融石碎片的粗级分大于较大Ds的由崩塌和岩石雪崩和类似于生成用于岩石碎片Ds的用于通过高速冲击试验产生的粗粒部分片段，这表明熔融石片段通过形成相对较高的能量过程导致强烈的碎片化。形成簇的碎片的出现表明碎片和埋葬后碎片没有明显分开。根据这些结果，我们得出结论，陨石的质量在经过弹道之后在着陆时着陆时被打碎了，没有受到进一步的干扰。