Lunar magmatism

Saved in:
Authors:Simon, S. B.
Author Affiliations:Primary:
S.D. Sch. Mines and Technol., Rapid City, SD, United States
Volume Title:Early Precambrian basic magmatism
Volume Authors:Hall, R. P., editor; Hughes, D. J.
Source:Early Precambrian basic magmatism, edited by R. P. Hall and D. J. Hughes, p.136-156. Publisher: Chapman and Hall, New York, NY, United States
Publication Date:1990
Note:In English; illus. incl. 36 analys., 5 tables
Summary:The lunar rock types described are consistent with a very early Moonwide differentiation event. Isotopic systems closed 4400 m.y. ago, indicating solidification of the magma ocean by that time. Impact resetting of these systems and ages of impact-induced melt shows that the Moon underwent heavy meteoric bombardment from the time of its formation until 3800 m.y. ago, as debris left over from the formation of the solar system was swept up. Recent falls of meteorites suggest that if a relatively recent lunar impact could deliver a meteorite from the Moon, then the giant basin- forming impacts of 3800 m.y. ago could have delivered a large amount of lunar material to the Earth at that time. Another question is whether a terrestrial planet should be expected to form a magma ocean and produce a thick crust or whether a relatively thin crust is to be expected. Based on studies of the Earth and inferences from basaltic meteorites, it was suggested that a major lunar magma ocean is a planetary anomaly and that an early terrestrial magma ocean would be buried by its own compressibility and the Earth's strong gravity. Nisbet & Walker have suggested that Archaean komatiites formed from leaks in a buried magma ocean and a magma ocean origin from eclogite at depths of between 300 and 670 km was proposed. These models, although devised for the Earth, would probably not have been possible without the knowledge gained from lunar samples. [J.M.H.]
Subjects:Basalts; Genesis; IGCP; Igneous rocks; KREEP; Lunar crust; Lunar highlands; Lunar mantle; Magmas; Maria; Moon; Petrology; Terrestrial comparison; Volcanic rocks; Igneous activity
Abstract Numbers:91M/2096
Record ID:1991002610
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Tags: Add Tag
No Tags, Be the first to tag this record!
Be the first to leave a comment!
You must be logged in first