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Inert gases in lunar samples.

D Heymann, A Yaniv, J A Adams

Science (New York, N.Y.)

|January 30, 1970

Summary

This study found inert gases in soil fragments, likely from solar wind. The gases are surface-correlated, and the sample yielded a potassium-argon age of 4.42 billion years.

Area of Science:

Geochemistry
Cosmochemistry
Planetary Science

Background:

Soil fragments contain significant amounts of inert gases.
Gas concentrations show an inverse relationship with particle size, suggesting surface correlation.

Purpose of the Study:

To investigate the origin and characteristics of inert gases in soil sample 10084,40.
To determine the isotopic composition and potential age of the sample.

Main Methods:

Analysis of inert gas concentrations in relation to particle size.
Comparison of elemental and isotopic ratios with solar and meteorite values.
Calculation of potassium-argon age.

Main Results:

Substantial inert gases found, inversely proportional to particle size, indicating surface correlation.

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Glass and feldspar are less gas-rich than lithic fragments.

Elemental ratios differ from solar values, while isotopic ratios resemble meteorites.

Argon-40 comprises both radiogenic and surface-correlated components.

Conclusions:

The inert gases likely originate from solar wind or solar cosmic rays.
The sample exhibits characteristics consistent with extraterrestrial material.
A potassium-argon age of 4.42 billion years was calculated, suggesting ancient origins.