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The petrogenesis of the Apollo 14 high-Al mare basalts

Clive R. Neal and Georgiana Y. Kramer
The petrogenesis of the Apollo 14 high-Al mare basalts (in Planetary materials; from the Earth to the Moon and beyond; Jim Papike special issue, Charles Shearer (prefacer), David Vaniman (prefacer) and Ted Labotka (prefacer))
American Mineralogist (October 2006) 91 (10): 1521-1535

Abstract

In this paper, we report analysis of various basaltic lunar samples including 14053 and 14072, KREEP basalt 15386, thirty basalt clasts from Apollo 14 breccia 14321, as well as impact-generated samples (matrix from breccia 14168, olivine vitrophyres 14321,1180 and 14321,1539, and impact melt 14310) using a combination of solution and laser ablation inductively coupled plasma mass spectrometry (ICP-MS). The basalt clast samples were previously analyzed by instrumental neutron activation. On plots of incompatible trace elements (ITEs) vs. compatible trace elements, the Apollo 14 high-Al basalts form three approximately subparallel trends that, on the basis of current data, are also separated by age. Plots of ITE ratios (i.e., Nb/Ce vs. Zr/Y) can be used to indicate source composition, and also divide the basalts into three groups: Group A (approximately 4.3 Ga); Group B (approximately 4.1 Ga); and Group C (approximately 3.9 Ga). New data for 14072 suggest the sample does not fit with any of the three groups defined here, and may indicate the presence of a fourth group of high-Al basalts in the proximity of the Apollo 14 site. The Apollo 14 high-Al basalts are compositionally distinct from known Apollo 14 impact melts and impact-generated lithologies. The three groups cannot be related by varying degrees of partial melting of a single, KREEP-contaminated source and, therefore, require three separate source regions. The new data indicate that Group A basalts evolved through closed-system crystal fractionation. However, the new data from basalts forming Groups B and C require open-system evolution that involves combined assimilation and fractional crystallization (AFC). Unlike previous AFC modeling of the Apollo 14 high-Al basalts, an assimilant composed of KREEP is not sufficient to generate the compositional ranges of each basalt group. The modeling of both groups requires a mixture of KREEP and granite as the assimilant, which supports the notion of a genetic relationship between these two lunar components.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 91
Serial Issue: 10
Title: The petrogenesis of the Apollo 14 high-Al mare basalts
Title: Planetary materials; from the Earth to the Moon and beyond; Jim Papike special issue
Author(s): Neal, Clive R.Kramer, Georgiana Y.
Author(s): Shearer, Charlesprefacer
Author(s): Vaniman, Davidprefacer
Author(s): Labotka, Tedprefacer
Affiliation: University of Notre Dame, Department of Civil Engineering and Geological Sciences, Notre Dame, IN, United States
Affiliation: University of New Mexico, Institute of Meteoritics, Albuquerque, NM, United States
Pages: 1521-1535
Published: 200610
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 88
Accession Number: 2006-091227
Categories: Extraterrestrial geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Secondary Affiliation: Los Alamos National Laboratory, USA, United StatesUniversity of Tennessee, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200650
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