Discovery of Cosmic Spherules from the Mesoproterozoic Strata and its Significance—in Case of the Ming Tombs Area, Beijing

Abstract

This study covers cosmic spherules derived from the Mesoproterozoic Dahongyu Formation in the Ming Tombs area, Beijing. The cosmic spherules include iron oxide cosmic spherules, carbonaceous chondrites, and atomic iron “steely bead”‐shaped cosmic spherules. The mineral assemblage of silicon carbide, forsterite, zircon, and glass spherules and fragments were picked from melt‐silicified carbonate of the Mesoproterozoic Dahongyu Formation (ca. 1625 Ma). Cosmic spherule assemblages are solely discovered from sedimentary rocks in China. Platinum group elements (PGE) were determined for the first time in cosmic spherules and associated minerals. PGE comparative observation between meteorite and cosmic spherules is presented in this study. It is recognized that an extraterrestrial meteorite impact event might have occurred in the Dahongyu Stage. The main evidence is a large number of iron cosmic spherules in silicified oncolitic limestone, and associated cosmic silicon carbide, glass spherules, and fragments, as well as the presence of forsterite. The impact‐volcanic crater is characteristic of a big black shale block dropped into the bended silicified limestone.

Continuous‐Flow Extraction of Adjacent Metals—A Disruptive Economic Window for In Situ Resource Utilization of Asteroids?

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Kontinuierliche Extraktion benachbarter Metalle im Durchstrombetrieb – ein disruptiver ökonomischer Ansatz zur In‐situ‐Rohstoffgewinnung auf Asteroiden?

“…Noch mehr Hitze verursachte die Freisetzung des größten Teils von Kohlenstoff und Wasser in Asteroiden. In ihnen bildeten sich Mineralien der Serpentingruppe, die durch Metamorphose in das Mineral Olivin überführt wurden [56] . Diese Asteroiden sind der Ursprung der C3‐ und C4‐Meteoriten.…”