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High crystallization temperatures indicated for igneous rocks from tranquillity base.

Science (New York, N.Y.)

|January 30, 1970

Summary

This summary is machine-generated.

Igneous rocks from Tranquillity Base contain significant native iron. These iron-sulfide intergrowths formed from a liquid that separated from magma at high temperatures.

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Area of Science:

Geology
Mineralogy
Petrology

Background:

Lunar igneous rocks provide insights into planetary formation.
Understanding mineral intergrowths is key to deciphering magmatic processes.

Purpose of the Study:

To investigate the origin and formation of troilite-iron intergrowths in lunar igneous rocks.
To determine the conditions under which these mineral assemblages formed.

Main Methods:

Petrographic analysis of lunar rock samples.
Mineralogical examination of troilite (FeS) and native iron intergrowths.

Main Results:

Lunar igneous rocks contain complex intergrowths of troilite and native iron.
Native iron constitutes 8.4% by volume of these intergrowths.
The intergrowths originated from a homogeneous sulfide liquid immiscibly separated from the magma.
Separation occurred at or above 1140 degrees C, late in the crystallization history.

Conclusions:

The formation of sulfide liquid was a late-stage magmatic event.
The high temperatures indicate specific conditions during lunar magma evolution.
These findings contribute to understanding the petrogenesis of lunar troilite and native iron.