Declassified UFO / UAP Document
ENQUETE 81/01: RESULTATS DES ANALYSES RELATIVES AUX ECHANTILLONS DE SOL
AI-Generated Summary
A technical report by S.N.E.A.P. analyzing soil samples from an investigation. It concludes that black traces on the soil are iron oxide subjected to temperatures between 250°C and 600°C.
This document, identified as ENQUETE 81/01, details the technical analysis of soil samples conducted by S.N.E.A.P. regarding an unspecified case. The investigation focused on black traces found on the soil surface, which were identified as iron or iron oxide plated onto limestone grains. Using microscopic analysis, including a CAMECA microprobe, researchers examined the physical and thermal characteristics of the samples. The report notes that the black deposits appear to have been subjected to thermal stress, resulting in increased soil solidity beneath the traces. Water content analysis indicated that there was no significant surface evaporation compared to control samples. Based on the chemical state of the iron and the absence of specific mineral transformations, the investigators concluded that the traces were likely iron oxide (Fe2O3) and that the soil had been exposed to temperatures between 250°C and 600°C. The report explicitly rules out temperatures above 600°C, as such heat would have caused visible burning and mineral efflorescence, which were not observed.
La température à laquelle ont été porté ces traces est estimée entre 250° et 600° : 250° < T < 600°
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Official Assessment
The black particles are likely iron oxide (Fe2O3) and the traces were subjected to temperatures between 250°C and 600°C.
Analysis of soil samples revealed black traces of iron or iron oxide plated onto limestone grains. The material was subjected to thermal stress, causing the soil to become more solid under the black deposits. Water content analysis showed no significant evaporation compared to surrounding soil. The temperature of the event is estimated to be between 250°C and 600°C, as temperatures below 250°C would have produced hydrated oxides, and temperatures above 600°C would have caused burning and mineral efflorescence.