Tungsten isotopes in ferroan anorthosites: Implications for the age of the Moon and lifetime of its magma ocean

被引：34

作者：

Touboul, Mathieu ^{[1
]}

Kleine, Thorsten ^{[1
]}

Bourdon, Bernard ^{[1
]}

Palme, Herbert ^{[2
]}

Wieler, Rainer ^{[1
]}

机构：

[1] ETH, Inst Isotope Geochem & Mineral Resources, CH-8092 Zurich, Switzerland

[2] Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany

来源：

ICARUS | 2009年 / 199卷 / 02期

关键词：

Moon; Cosmochemistry; Thermal histories; Planetary formation; Accretion; HF-W CHRONOMETRY; CORE FORMATION; LUNAR CRUST; IMPACT HISTORY; ORIGIN; EARTH; DIFFERENTIATION; EVOLUTION; ACCRETION; CONSTRAINTS;

D O I：

10.1016/j.icarus.2008.11.018

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

New W isotope data for ferroan anorthosites 60025 and 62255 and low-Ti mare basalt 15555 show that these samples, contrary to previous reports [Lee, D.C., et al., 1997. Science 278, 1098-1103: Lee, D.C., et al., 2002. Earth Planet. Sci. Lett. 198, 267-274], have a W isotope composition that is indistinguishable from KREEP and other mare basalts. This requires crust extraction on the Moon later than similar to 60 Myr after CAI formation, consistent with (SM)-S-147-Nd-143 ages for ferroan anorthosites. The absence of Hf-182-induced W-182 variations in the Moon is consistent with formation of the Moon at 62(10)(+90) Myr after CAI formation 10 that has been inferred based oil the indistinguishable W-182/W-184 ratios of the bulk Moon and the bulk silicate Earth. The uncertainties oil the age of the Moon and the age of the oldest lunar samples currently hamper a precise determination of the duration of magma ocean solidification and are consistent with both an almost immediate crystallization and a more protracted timescale of similar to 100 Myr. (c) 2008 Elsevier Inc. All rights reserved.

引用

页码：245 / 249

页数：5

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