Web10 de dez. de 1976 · Large numbers of black metallic spherules ranging in diameter from a few micrometers to over 800 micrometers are raining into the eastern Gulf of ... and its magnitude poin … Black magnetic spherule fallout in the eastern gulf of Mexico Science. 1976 Dec 10;194(4270):1157-9. doi: 10.1126/science.194.4270.1157-a ... WebBlack magnetic spherules from various sources have been analysed with an electron microprobe. Some earlier work on cosmic spherules is discussed, as it seems that such particles have been confused, not only with industrial contaminations, but also with spherules of volcanic origin.
Lightning-induced volcanic spherules Geology
Web1 de abr. de 2015 · Glass spherules have been documented in many geologic deposits and are formed during high-temperature processes that include cloud-to-ground lightning … Web•They formed at temperatures from 1500°C to 2000°C (3600°F) •The iron-rich ones cannot form naturally on Earth •Volcanoes produce glassy spherules, but not iron-rich ones … flutter package_info_plus
An urban collection of modern-day large ... - GeoScienceWorld
WebBlack magnetic spherules, 30-150 μ in dia., extracted from crushed indochinites and other tektites, as well as magnetic fractions of various impact glasses were polished and studied under the reflecting microscope and by the electron microprobe. In the tektites, three kinds of spherules were found: type I, magnetic spherules consisting of magnetite skeletons … Web1 de fev. de 2024 · Studies by Nininger (1941) reported large numbers of magnetic spherules collected in urban areas; however, later studies showed that the abundance of magnetic particles decreases away from urban areas, and that urban spherules are largely artificial in origin (Buddhue, 1950; Handy and Zimmerman, 1953). WebThe origin of black magnetic spherules sampled in air, and in ancient and recent marine sediments has been investigated. Experiments were performed reproducing in laboratory … flutter packages download