An Impactor Origin for Lunar Magnetic Anomalies

被引：117

作者：

Wieczorek, Mark A. ^{[1
]}

Weiss, Benjamin P. ^{[2
]}

Stewart, Sarah T. ^{[3
]}

机构：

[1] Univ Paris Diderot, Inst Phys Globe Paris, F-94100 St Maur Des Fosses, France

[2] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[3] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA

来源：

SCIENCE | 2012年 / 335卷 / 6073期

关键词：

DYNAMO DRIVEN; MELT BRECCIAS; CORE DYNAMO; PROSPECTOR; IDENTIFICATION; METEORITES; PROJECTILE; DICHOTOMY; COMPONENT; INTERIOR;

D O I：

10.1126/science.1214773

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The Moon possesses strong magnetic anomalies that are enigmatic given the weak magnetism of lunar rocks. We show that the most prominent grouping of anomalies can be explained by highly magnetic extralunar materials from the projectile that formed the largest and oldest impact crater on the Moon: the South Pole-Aitken basin. The distribution of projectile materials from a model oblique impact coincides with the distribution of magnetic anomalies surrounding this basin, and the magnetic properties of these materials can account for the intensity of the observed anomalies if they were magnetized in a core dynamo field. Distal ejecta from this event can explain the origin of isolated magnetic anomalies far from this basin.

引用

页码：1212 / 1215

页数：4

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