Universität zu Köln

Carlson, Richard W., Brasser, Ramon, Yin, Qing-Zhu ORCID: 0000-0002-4445-5096, Fischer-Goedde, Mario and Qin, Liping (2018). Feedstocks of the Terrestrial Planets. Space Sci. Rev., 214 (8). DORDRECHT: SPRINGER. ISSN 1572-9672

Full text not available from this repository.

Abstract

The processes of planet formation in our Solar System resulted in a final product of a small number of discreet planets and planetesimals characterized by clear compositional distinctions. A key advance on this subject was provided when nucleosynthetic isotopic variability was discovered between different meteorite groups and the terrestrial planets. This information has now been coupled with theoretical models of planetesimal growth and giant planet migration to better understand the nature of the materials accumulated into the terrestrial planets. First order conclusions include that carbonaceous chondrites appear to contribute a much smaller mass fraction to the terrestrial planets than previously suspected, that gas-driven giant planet migration could have pushed volatile-rich material into the inner Solar System, and that planetesimal formation was occurring on a sufficiently rapid time scale that global melting of asteroid-sized objects was instigated by radioactive decay of Al-26. The isotopic evidence highlights the important role of enstatite chondrites, or something with their mix of nucleosynthetic components, as feedstock for the terrestrial planets. A common degree of depletion of moderately volatile elements in the terrestrial planets points to a mechanism that can effectively separate volatile and refractory elements over a spatial scale the size of the whole inner Solar System. The large variability in iron to silicon ratios between both different meteorite groups and between the terrestrial planets suggests that mechanisms that can segregate iron metal from silicate should be given greater importance in future investigations. Such processes likely include both density separation of small grains in the nebula, but also preferential impact erosion of either the mantle or core from differentiated planets/planetesimals. The latter highlights the important role for giant impacts and collisional erosion during the late stages of planet formation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Carlson, Richard W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brasser, Ramon UNSPECIFIED UNSPECIFIED UNSPECIFIED Yin, Qing-Zhu UNSPECIFIED orcid.org/0000-0002-4445-5096 UNSPECIFIED Fischer-Goedde, Mario UNSPECIFIED UNSPECIFIED UNSPECIFIED Qin, Liping UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-164807
DOI:	10.1007/s11214-018-0554-x
Journal or Publication Title:	Space Sci. Rev.
Volume:	214
Number:	8
Date:	2018
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1572-9672
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLYBDENUM ISOTOPE ANOMALIES; HIGHLY SIDEROPHILE ELEMENTS; EARLY SOLAR-SYSTEM; HF-W CHRONOMETRY; CORE FORMATION; IRON-METEORITES; LATE ACCRETION; CHEMICAL-COMPOSITION; HETEROGENEOUS DISTRIBUTION; GRADUAL ACCUMULATION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/16480