A new study of craters on the Moon tends to link the asymmetry between the two lunar faces to a massive meteorite impact at the South Pole level, following the hypothesis that the latter would have stimulated volcanic processes at the level. From its visible side facing the Earth.
The moon constantly shows the same face to the Earth: it’s locked with effect , invisible from Earth. The differences between the two aspects have been highlighted from the first From the face hidden by the Soviet probe Luna 3, in 1959: Scientists then discovered a rough surface filled with craters (called ridges), in contrast to the visible face, which was riddled with craters – wide plains Dark and smooth in appearance.(Ha equal to her ), and thus contains a file
Do different chemical compositions explain the lunar asymmetry?
But the elements that characterize the two lunar faces are not only geomorphological: missions after Luna 3 have also revealed significant differences in the geochemical composition between the two faces. The visible side houses aThe chemical structure is called Procellarum KREEP Terrane (PKT), which is characterized by high concentrations of potassium (K), (REE), in (P) as well as other elements that produce Like the (y). This anomaly is widely represented in and around the periphery (Oceanus Procellarum) and is universally present on the visible side, but appears more distracting on the hidden side.
Scientists currently agree to point the finger at the chemical anomaly PKT to explain the split between the two lunar faces: Characterized by high concentrations of heat-producing elements, this anomaly may have the potential to trigger late volcanic processes in the visible plane. Satellite face. But the mechanism in the origin of this anomaly remains unknown: high concentrations of incompatible elements (which tend to concentrate in the liquid phase during ; It seems to indicate that the impact of the meteorite in the origin of the formation (the second largest impact basin in the Solar System, located at the south pole of the Moon, a small part of which is represented on the visible face – 2500 km in diameter and 12 km in depth) could preferentially redistribute the constituent elements of KREEP at the level of the visible face: in Indeed, it appears that the formation of the Antarctic-Aitken basin tentatively coincides with the formation of the last lunar seas.from one ), the elements characterizing KREEP have finally crystallized, and thus have formed in a relatively uniform way the upper layer of
A massive meteor impact would redistribute chemical elements around the moon
Then the team of researchers producedto simulate the effect From the heat generated by such an effect on the interior of the Moon, and on a possible redistribution of the KREEP elements. Their simulations have proven to be quite crucial: for any simulated impact scenario (from direct and violent to low impact). and low angle), the amount of mobilized KREEP elements varies, but consistently results in high concentrations of these elements around the distal side, consistent with the observed KPT anomaly. Thus, scientists support the idea that a meteorite impact at the origin of the Antarctic-Aitken basin would have made it possible to drill material down to upper, lower .
Dating arguments for various lunar structures on the visible side seem to support this idea: the calculation of craters in the PKT region indicates that this formation would have been later to form the Antarctic impact basin, and the older basaltic seas would date back to -4.3 billion years (about 200 million years after the Aitken impact) ; Their model already shows a thermal asymmetry between the two faces over more than 600 million years after the impact, due to the asymmetry in the chemical composition and the stimulation of volcanic processes on the visible face.
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