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📰 Collisions during the formation of the Earth have changed its composition

Earth is an active planet over 4.5 billion years old. This long evolution makes it difficult to understand its formation. Meteorites are remnants of this early history of solar system formation and tell us about the formation of planets. The analysis of neodymium (Neodymium is a chemical element, symbol Nd and atomic number 60….) (metal gray silver (Silver or silver metal is a chemical element with the symbol Ag — du…) of the group of rare earths) makes it possible to specify these genetic relations as well as to identify the early processes of differentiation of the planets. This study, carried out by a team of research (Scientific research designates in the first place all the actions undertaken with a view to…) including scientists from the CNRS-INSU, brings new constraints on the formation of planets.


Credit: NASA/SOFIA/Lynette Cook

The researchers analyzed the neodymium composition of early meteorites. These objects have not undergone any differentiation and their study communicates unique information on the composition of the solar system (The solar system is a planetary system composed of a star, the…) and therefore that of the planets before they underwent a differentiation. The study was also completed by the analysis of meteorites from proto-planets, that is to say smaller differentiated objects such as we observe them today in the asteroid belt.

The results show that the Earth (Earth is the third planet in the Solar System in order of distance…) and the proto-planets have a composition different (In mathematics, the different is defined in algebraic theory of…) primitive meteorites. New analysis techniques developed at the Magmas and Volcanoes Laboratory have rendered (Rendering is a computer process calculating the 2D image (equivalent to a photograph)…) possible the detection of these minute variations. The first planets were differentiated during the first million (One million (1,000,000) is the natural number following nine hundred and ninety-nine…) years of the solar system. The crusts formed in surface (A surface generally refers to the superficial layer of an object. The term a…) were later destroyed in collisions between proto-planets. Between 4 and 20% of the earth mass (The mass of the Earth (M) is estimated at 5.9736×1024 kg. It is obtained at…) is believed to have been lost during its formation.

These results highlight the impact of collisions during the formation of planets on their composition. Thus the composition of the Earth cannot be estimated from primitive meteorites. the budget (A budget is a provisional accounting document distinguishing income and expenditure.) essential elements for the production of heat (In everyday language, the words heat and temperature often have an equivalent meaning:…) radioactive must be lower than that currently proposed which must reduce the heat flux (Heat flow is a transmission of heat (or thermal energy) through a body. The…) who participates in theactivity (The term activity can refer to a profession.) geological of our planet (A planet is a celestial body orbiting around the Sun or another star in…).

CNRS laboratory involved:
Magmas and Volcanoes Laboratory (LMV – OPGC)
Supervision: CNRS / IRD/ UCA (Uca is a genus of crabs in the Ocypodidae family. It includes around a hundred species of…).
Collisional erosion or loss of the primitive crusts of asteroids duringaccretion (Accretion designates in astrophysics, geology and meteorology the increase by…) © P. Frossard et al.

Learn more:
Earth’s composition was modified by collisional erosion – Science (Science (Latin scientia, “knowledge”) is, according to the dictionary…) Flight 377, NO. 6614.
Paul Frossard, Claudine Israel, Audrey Bouvier, Maud Boyet.
https://doi.org/10.1126/science.abq7351

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