| 70826 |
Creator |
1c5c32b11b5ad1bd9c846a77784abc38 |
| 70826 |
Creator |
5a9f28970e2d0d0ba76f7ab60ee890ba |
| 70826 |
Creator |
ext-149f0da76580f36a1e4df965dbeff6dc |
| 70826 |
Creator |
ext-1822531c77c078556b6960810bb19cec |
| 70826 |
Creator |
ext-4df4437d65a8a1e2c1da330c3bdcb605 |
| 70826 |
Creator |
ext-55f46aa1585adc858325dde6e7dda60d |
| 70826 |
Creator |
ext-8650d4dd422516e563c44c7acf2a7ab9 |
| 70826 |
Creator |
ext-99046648ece243d33fbe658917b9bf45 |
| 70826 |
Creator |
ext-a4221ac37dd54aec040160d3df9137e4 |
| 70826 |
Date |
2020 |
| 70826 |
Is Part Of |
repository |
| 70826 |
Is Part Of |
p23973366 |
| 70826 |
abstract |
Accurately constraining the formation and evolution of the lunar magnesian suite is
key to understanding the earliest periods of magmatic crustal building that followed
accretion and primordial differentiation of the Moon. However, the origin and evolution
of these unique rocks is highly debated. Here, we report on the microstructural characterization
of a large (~250-μm) baddeleyite (monoclinic-ZrO<sub>2</sub>) grain in Apollo troctolite
76535 that preserves quantifiable crystallographic relationships indicative of reversion
from a precursor cubic-ZrO<sub>2</sub> phase. This observation places important constraints
on the formation temperature of the grain (>2,300 °C), which endogenic processes alone
fail to reconcile. We conclude that the troctolite crystallized directly from a large,
differentiated impact melt sheet 4,328 ± 8 Myr ago. These results suggest that impact
bombardment would have played a critical role in the evolution of the earliest planetary
crusts. |
| 70826 |
authorList |
authors |
| 70826 |
status |
peerReviewed |
| 70826 |
type |
AcademicArticle |
| 70826 |
type |
Article |
| 70826 |
label |
White, L.F.; Cernok, A. ; Darling, J.R.; Whitehouse, M.J.; Joy, K.H.; Cayron, C.;
Dunlop, J.; Tait, K.T. and Anand, M. (2020). Evidence of extensive lunar crust formation
in impact melt sheets 4,330 Myr ago. Nature Astronomy (Early Access). |
| 70826 |
Title |
Evidence of extensive lunar crust formation in impact melt sheets 4,330 Myr ago |
| 70826 |
in dataset |
oro |