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Chemical and Sr-isotopic characteristics of the Luna 24 samplesThe chemical and Sr isotopic characteristics of Luna 24 bulk soil samples are determined and interpreted within the framework of lunar mare basalt evolution. Major and trace element compositions lead to the suggestion of candidate rock types consisting of a basalt/gabbro with very low TiO2 and MgO content (52%), a very low TiO2 basalt with 10% MgO (23%), olivine vitrophyre (20%), low K Fra Mauro basalt (4%) and anorthositic gabbro (1%). The proposed compositions are supported by the agreement of mixing models based on the proposed compositions with observed soil compositions. Sr ratios for plagioclase samples imply a lower Sr-87/Sr-86 value for low Mg soils than for other mare basalts and higher Rb/Sr and a more evolved Sr ratio in high Mg basalts. Rb, Sr and rare earth element compositions for low Mg basalts fit a model of partial remelting of cumulates containing small amounts of plagioclase.
Document ID
19790048529
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Nyquist, L. E.
(Lockheed Electronics Co. Houston, TX, United States)
Mckay, G.
(NASA Johnson Space Center Houston, Tex., United States)
Wiesmann, H.
(Lockheed Electronics Co. Houston, TX, United States)
Bansal, B.
(Lockheed Electronics Co. Houston, TX, United States)
Wooden, J.
(Lockheed Electronics Co., Inc. Houston, Tex., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Mare Crisium: The view from Luna 24; Conference
Location: Houston, TX
Start Date: December 1, 1977
End Date: December 3, 1977
Sponsors: NSF
Accession Number
79A32542
Distribution Limits
Public
Copyright
Other

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