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Lunar Processes: Molten Mantle and Dynamic Dynamos

Monday, March 13, 2023, 2:15 PM
Waterway Ballroom 1

Yuanyuan Liang
Jeff Andrews-Hanna
Sonia Tikoo
2:15 PM
Session Introduction
2:20 PM
Schwinger S.* Röhlen R. Wiesner N.
Contribution of Impact Material to the Lunar Magma Ocean Liquid and Solid Cumulates [#2025]
Where does material impacting the lunar magma ocean end up — in the solid cumulate or the magma liquid? And how does this affect mantle reservoir compositions?
2:30 PM
Fu H.* Jacobsen S. B. Sedaghatpour F.
Timeline of Lunar Differentiation Recorded in Calcium and Magnesium Stable Isotopes [#2400]
Ca and Mg stable isotope evidence revealed from lunar samples refines the timescale of the lunar differentiation to <10–30 or 30–150 million years.
2:40 PM
Andrews-Hanna J. C.* Evans A. J. Mallik A.
Forming the Lunar Asymmetries [#2507]
The lunar crustal and topographic asymmetry could have formed from a degree-one instability during magma ocean crystallization.
2:50 PM
Jones M. J.* Evans A. J.
Fate of Th- and Ti-Bearing Lunar Magma Ocean Cumulates in the Aftermath of Major Basin-Forming Impacts [#1750]
Oh, KREEP! where are you? / Hiding beneath the surface / Hugging the Moon’s core?
3:00 PM
Panel Q&A
3:20 PM
Scholpp J. S.* Dygert N.
Hybridization of Lunar Mantle Sources by Garnet-Bearing Cumulates During Overturn Reconciles the REE, and Nd and Hf Isotopic Characteristics of High-Ti Basalts [#1569]
Computational modeling of the impacts that lunar cumulate overturn and hybridization processes would have on REE and isotope compositions of mantle sources.
3:30 PM
Ji D. J.* Dygert N. D.
New Experimental Constraints on REE Partitioning Between Apatite and Silicate Melts and a Temperature and Composition-Dependent Predictive Partitioning Model [#1255]
The work presents new apatite-melt partitioning experiments relevant to the lunar magma ocean and a predictive model for apatite-melt trace element partitioning.
3:40 PM
Chaffee T.* Tikoo S. M. Abubo R. Boeschen S. G. Weiss B. P.
Testing Whether Lunar Melt Glasses Preserve Records of Impact-Generated Magnetic Fields [#1741]
South Ray melt glasses / Do they record impact fields? / We put this to test.
3:50 PM
Liang Y.* Tikoo S. M. Krawczynski M. J.
Experimentally Testing Whether Magmatic Processes Can Produce Strong Lunar Crustal Magnetism [#2572]
Lunar magnetism / Attracts our lab to resolve / Abnormalities.
4:00 PM
Panel Q&A
4:20 PM
Jung J.* Tikoo S. M. Burns D. H.
Exploring the Possible Origins of Magnetization Recorded in Apollo 11 Mare Basalts [#1810]
We conducted paleomagnetic investigations on four Apollo 11 mare basalts to explore the possible origin of their magnetizations.
4:30 PM
Zhou T.* Tarduno J. A. Cottrell R. D. Neal C. R. Nimmo F. et al.
A Lunar Core Dynamo Limited to the Moon’s First 200 Million Years [#2261]
New zero magnetic field measurements from Apollo samples as old as 4.3 Ga limits a strong, sustained lunar core dynamo to the Moon’s first 200 million years.
4:40 PM
Vervelidou F.* Shah J. Eckley S. Weiss B. P. Zeigler R. A.
Evidence for Temporal Variability of the Lunar Dynamo [#2369]
We conducted controlled-atmosphere, double-heating paleointensity analyses on three lunar regolith breccias of different assembly ages.
4:50 PM
Weiss B. P.* Wieczorek M. A. Gattacceca J. Tikoo S. M. McDonald C. et al.
Evidence for a Long-Lived Lunar Dynamo from Magnetization in Apollo Samples and the Lunar Crust [#1627]
The paleomagnetism of lunar rocks provides overwhelming evidence for a lunar dynamo lasting beyond 4.2 Ga ago and likely until at least 1.5 Ga ago.
5:00 PM
Panel Q&A
5:20 PM
Session Closure