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Seatbelt basalt

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From Wikipedia, the free encyclopedia

Lunar rock collected during the Apollo 15 mission

Cut fragment on display at theNational Air and Space Museum

Planimetric map of Station 3 from theApollo 15 Preliminary Science Report.X indicates sample locations, 5-digitnumbers areLRL sample numbers,**rectangle** islunar rover (dot indicates TV camera),**black spots** are large rocks,**dashed lines** arecrater rims or other topographic features, andtriangles arepanorama stations.

Lunar Sample 15016, better known as the "Seatbelt Basalt", is alunar sample discovered and collected on theApollo 15 mission in 1971 in theHadley-Apennine region of the Moon. The rock is a 0.923 kg (2.03 lb) vesicularolivine basalt.

It is so named because mission commander,David Scott, noticed it on the surface while driving theLunar Roving Vehicle and stopped to collect it, but said to mission control that he was just fastening his seatbelt.^[1] He did this because he assumed mission control would not give permission to stop for a sample collection due to time constraints.^[2] This unplanned stop was later designated Geology Station 3, located about 125 metres (410 ft) west ofRhysling crater.

This sample was collected from an area with abundant subdued craters between 0.1 and 1 metre (0.33 and 3.28 ft) in diameter. The sample is a very vesicular basalt, rounded by surface erosion.Lithologically, it closely resembles samples 15535 and 15536, as well as a number of fragments in the rake samples from station 9A.^[3]

The seatbelt basalt is currently stored at theLunar Sample Laboratory Facility at theLyndon B. Johnson Space Center. A piece of it is on display at theNational Air and Space Museum in Washington, DC.

Description

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The seatbelt basalt is a highly-vesicular,olivine-normative,basalt withphenocrysts of zonedpyroxene and olivine within a matrix of pyroxene andplagioclase. The rock also containsilmenite andulvöspinel.

Age

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The rock'scosmic ray exposure age was discovered to be about 285 million years.^[4] Another study determined the age to be 315 million years.^[5]

The rock's age of formation has been estimated to be approximately 3.29 ± 0.05 billion years fromRb-Sr radiometric dating.^[6]

References

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^To a Rocky Moon: A Geologist's History of Lunar Exploration.Don E. Wilhelms, University of Arizona Press (1993), p. 273-4.ISBN 978-0816510658
^Boyle, Rebecca (2021-07-27)."50 Years Ago, NASA Put a Car on the Moon".The New York Times.ISSN 0362-4331. Retrieved2021-07-27.
^Apollo 15 Preliminary Science Report (NASA SP-289, 1972), Chapter 5.
^Kirsten, T., Deubner, J., Horn, P., Kaneoka, I., Kiko, J., Schaeffer, O. A., and Thio, S. K. (1972) The rare gas record of Apollo 14 and 15 samples.Proc. 3rd Lunar Sci. Conf. 1865-1889.
^Husain, L. (1974)⁴⁰Ar-³⁹Ar chronology and cosmic ray exposure ages of the Apollo 15 samples.J. Geophys. Res. 79, 2588-2606.
^Evensen, N. M., Murthy, V. R. and Coscio, M. R. (1973) Rb-Sr ages of some mare basalts and the isotopic and trace element systematics in lunar fines.Proc. 4th Lunar Sci. Conf. 1707-1724.

External links

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Sample 15016

Apollo program

Launch complexes

Ground facilities

Launch vehicles

Spacecraft and rover

Flights

Uncrewed	AS-101 AS-102 AS-201 AS-202 Apollo 4 Apollo 5 Apollo 6^†
Crewed	Apollo 1^† Apollo 7 Apollo 8 Apollo 9 Apollo 10 Apollo 11 Apollo 12 Apollo 13^† Apollo 14 Apollo 15 Apollo 16 Apollo 17
Saturn development	Saturn-Apollo 1 SA-2 SA-3 SA-4 SA-5 AS-203 Apollo 4 Apollo 6^†
Abort tests	QTV Pad Abort Test-1 A-001 A-002 A-003 Pad Abort Test-2 A-004
Pegasus flights	AS-103 AS-104 AS-105