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Updated: Jul 12, 2026
10:12
Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
Published on: June 19, 2018
Mineralogy and deformation in some lunar samples
Science (New York, N.Y.)
|January 30, 1970
Summary
Tranquillity Base rocks reveal both volcanic origins from titanium-rich magma and subsequent impact events. Analysis shows igneous textures and unique mineral formations, altered by meteorite impacts.
Area of Science:
- Lunar geology
- Petrology
- Mineralogy
Background:
- Tranquillity Base samples include crystalline rocks, breccias, and fines.
- Understanding the origin and evolution of lunar materials is crucial for planetary science.
Purpose of the Study:
- To investigate the mineralogy and deformation of lunar samples from Tranquillity Base.
- To differentiate between magmatic and impact processes in the formation of these samples.
Main Methods:
- Mineralogical analysis of crystalline rocks, breccias, and fines.
- Deformation analysis to identify shock effects.
- Petrographic examination of textures and mineral compositions.
Main Results:
- Crystalline rocks exhibit homogeneity, igneous textures, and lack xenoliths, suggesting an anorogenic volcanic origin from titanium-rich magma.
- Crystallization conditions led to significant compositional variations in pyroxenes, olivine, and plagioclase, and the formation of a novel iron analog of pyroxmangite.
- Impact events subsequently created breccias with shock-deformed crystals and glasses of diverse compositions.
Conclusions:
- Lunar samples from Tranquillity Base provide evidence for a dual history of internal magmatic processes and external impact events.
- The findings highlight the complex geological evolution of the lunar surface, involving both volcanism and meteorite bombardment.
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