Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 84-87 |
| Seitenumfang | 4 |
| Fachzeitschrift | SCIENCE |
| Jahrgang | 301 |
| Ausgabenummer | 5629 |
| Publikationsstatus | Veröffentlicht - 4 Juli 2003 |
| Extern publiziert | Ja |
Abstract
It has been assumed that Nb and Ta are not fractionated during differentiation processes on terrestrial planets and that both elements are lithophile. High-precision measurements of Nb/Ta and Zr/Hf reveal that Nb is moderately siderophile at high pressures. Nb/Ta values in the bulk silicate Earth (14.0 ± 0.3) and the Moon (17.0 ± 0.8) are below the chondritic ratio of 19.9 ± 0.6, in contrast to Mars and asteroids. The lunar Nb/Ta constrains the mass fraction of impactor material in the Moon to less than 65%. Moreover, the Moon-forming impact can be linked in time with the final core-mantle equilibration on Earth 4.533 billion years ago.
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in: SCIENCE, Jahrgang 301, Nr. 5629, 04.07.2003, S. 84-87.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Evolution of planetary cores and the Earth-Moon system from Nb/Ta systematics
AU - Münker, Carsten
AU - Pfänder, Jörg A.
AU - Weyer, Stefan
AU - Büchl, Anette
AU - Kleine, Thorsten
AU - Mezger, Klaus
PY - 2003/7/4
Y1 - 2003/7/4
N2 - It has been assumed that Nb and Ta are not fractionated during differentiation processes on terrestrial planets and that both elements are lithophile. High-precision measurements of Nb/Ta and Zr/Hf reveal that Nb is moderately siderophile at high pressures. Nb/Ta values in the bulk silicate Earth (14.0 ± 0.3) and the Moon (17.0 ± 0.8) are below the chondritic ratio of 19.9 ± 0.6, in contrast to Mars and asteroids. The lunar Nb/Ta constrains the mass fraction of impactor material in the Moon to less than 65%. Moreover, the Moon-forming impact can be linked in time with the final core-mantle equilibration on Earth 4.533 billion years ago.
AB - It has been assumed that Nb and Ta are not fractionated during differentiation processes on terrestrial planets and that both elements are lithophile. High-precision measurements of Nb/Ta and Zr/Hf reveal that Nb is moderately siderophile at high pressures. Nb/Ta values in the bulk silicate Earth (14.0 ± 0.3) and the Moon (17.0 ± 0.8) are below the chondritic ratio of 19.9 ± 0.6, in contrast to Mars and asteroids. The lunar Nb/Ta constrains the mass fraction of impactor material in the Moon to less than 65%. Moreover, the Moon-forming impact can be linked in time with the final core-mantle equilibration on Earth 4.533 billion years ago.
UR - http://www.scopus.com/inward/record.url?scp=2142730588&partnerID=8YFLogxK
U2 - 10.1126/science.1084662
DO - 10.1126/science.1084662
M3 - Article
C2 - 12843390
AN - SCOPUS:2142730588
VL - 301
SP - 84
EP - 87
JO - SCIENCE
JF - SCIENCE
SN - 0036-8075
IS - 5629
ER -