Iron Abundances in Lunar Impact Basin Melt Sheets From Orbital Magnetic Field Data

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F17%3A00487580" target="_blank" >RIV/67985831:_____/17:00487580 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/17:10369560

Result on the web

<a href="http://dx.doi.org/10.1002/2017JE005397" target="_blank" >http://dx.doi.org/10.1002/2017JE005397</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2017JE005397" target="_blank" >10.1002/2017JE005397</a>

Result language

angličtina

Original language name

Iron Abundances in Lunar Impact Basin Melt Sheets From Orbital Magnetic Field Data

Original language description

Magnetic field data acquired from orbit shows that the Moon possesses many magnetic anomalies. Though most of these are not associated with known geologic structures, some are found within large impact basins within the interior peak ring. The primary magnetic carrier in lunar rocks is metallic iron, but indigenous lunar rocks are metal poor and cannot account easily for the observed field strengths. The projectiles that formed the largest impact basins must have contained a significant quantity of metallic iron, and a portion of this iron would have been retained on the Moon's surface within the impact melt sheet. Here we use orbital magnetic field data to invert for the magnetization within large impact basins using the assumption that the crust is unidirectionally magnetized. We develop a technique based on laboratory thermoremanent magnetization acquisition to quantify the relationship between the strength of the magnetic field at the time the rock cooled and the abundance of metal in the rock. If we assume that the magnetized portion of the impact melt sheet is 1km thick, we find average abundances of metallic iron ranging from 0.11% to 0.45wt%, with an uncertainty of a factor of about 3. This abundance is consistent with the metallic iron abundances in sampled lunar impact melts and the abundance of projectile contamination in terrestrial impact melts. These results help constrain the composition of the projectile, the impact process, and the time evolution of the lunar dynamo.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA17-05935S" target="_blank" >GA17-05935S: Role of changes in environemntal chemistry on lake ecosystems at the Younger Dryas onset</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Geophysical Research: Planets

ISSN

2169-9097

e-ISSN

—

Volume of the periodical

122

Issue of the periodical within the volume

12

Country of publishing house

US - UNITED STATES

Number of pages

16

Pages from-to

2429-2444

UT code for WoS article

000419993400003

EID of the result in the Scopus database

2-s2.0-85040671347