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January 1824 has fallen 15, 44° 46' N., 11° 17' And. Francesco Lenzi 16 January 1824 has written a story of the fall of the meteorite, this is held the historical archives of the Municipality of Cento, click here you can here read the document originates them. To Renazzo, Italy, to the hours 20:30, an luminous light has been seen in the sky accompanied from three detonations and several stones have fallen to the ground. Three of these have been recovered, largest hung 441 gr., but the all up weight of fragments is of 10 kilograms. Is a meteorite between primitivi known. Rich of Magnesium contained to ~50-60 vol% it has been formed from the premonitory material that, originally, has condensed to the high temperatures in the nebula solar. These complexes have been fused from a solar impulse of heat and joined in order to form You-it has enriched. The material of the next layer has been formed from this same You-exhausted region of gas. The studies of the microelement have identified the inclusions of old glass inside. The group of the CR contains, unusually, metallic FeNi under form of taenite and kamacite (5-8 vol%), with pyrrhotite of the sulfides and pentlandite (1-4vol%). The metal is introduced in " Renazzo" inside, on the hems and in separate grains. During fusion event has been FeO aggregates and present others flown them in the condensed ones of the premonitory one, successively towards inside. Chondrules that they have been fused the more up correspond to the figure more circular, developing majority of grains of the metal on their hems. In consequence of the evaporation and expansion has been enriched of Ni. The oligoelement is rich of Ni-Co, this scene and the data are the origins of the metal and the condensation directed from a gas solar with the generation dell' other metal through reduction of adjacent grains the silicato one. It is made idrotermali of alteration are abundant, comprised the coil, has smectite and mineral of the group of the clorite ones. The isotopic compositions oxygen and the mineral characteristics of these clasts dark show the likenesses to the chondrites carbonic of the type 3° that watery they have been altered before their incorporation, moreover are important likenesses between the group of the CR and the group us, both formats in the same nebular region, but with the RS that endures the reduction during the metamorphosis and idrotermale alteration. Residual organic the interstellar ones, enriched in deuterium and heavy nitrogen, are equally present in "Renazzo" and in others chondrites of the CR. These macromolecules are made up 1/4 of oxidized species (alteration hydrous) reduced to contain of the residual ones ring C.
Other images of the Renazzo meteorite collections in net:
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- Articolo 1 (english) |
- Articolo 2 (english) |
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