Compositional and lithological diversity among brecciated lunar meteorites of intermediate iron concentration
Identifieur interne : 000698 ( Main/Exploration ); précédent : 000697; suivant : 000699Compositional and lithological diversity among brecciated lunar meteorites of intermediate iron concentration
Auteurs : Randy L. Korotev [États-Unis] ; Ryan A. Zeigler [États-Unis] ; Bradley L. Jolliff [États-Unis] ; Anthony J. Irvin [États-Unis] ; Theodore E. Bunch [États-Unis]Source :
- Meteoritics & Planetary Science [ 1086-9379 ] ; 2009-09.
Abstract
Abstract— We present new compositional data for 30 lunar stones representing about 19 meteorites. Most have iron concentrations intermediate to those of the numerous feldspathic lunar meteorites (3–7% FeO) and the basaltic lunar meteorites (17–23% FeO). All but one are polymict breccias. Some, as implied by their intermediate composition, are mainly mixtures of brecciated anorthosite and mare basalt, with low concentrations of incompatible elements such as Sm (1–3 μg/g). These breccias likely originate from points on the Moon where mare basalt has mixed with material of the FHT (Feldspathic Highlands Terrane). Others, however, are not anorthosite‐basalt mixtures. Three (17–75 μ/g Sm) consist mainly of nonmare mafic material from the nearside PKT (Procellarum KREEP Terrane) and a few are ternary mixtures of material from the FHT, PKT, and maria. Some contain mafic, nonmare lithologies like anorthositic norites, norites, gabbronorites, and troctolite. These breccias are largely unlike breccias of the Apollo collection in that they are poor in Sm as well as highly feldspathic anorthosite such as that common at the Apollo 16 site. Several have high Th/Sm compared to Apollo breccias. Dhofar 961, which is olivine gabbronoritic and moderately rich in Sm, has lower Eu/Sm than Apollo samples of similar Sm concentration. This difference indicates that the carrier of rare earth elements is not KREEP, as known from the Apollo missions. On the basis of our present knowledge from remote sensing, among lunar meteorites Dhofar 961 is the one most likely to have originated from South Pole‐Aitken basin on the lunar far side.
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DOI: 10.1111/j.1945-5100.2009.tb01223.x
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Jolliff</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Earth and Planetary Sciences and McDonnell Center for the Space Sciences, Washington University, 1 Brookings Drive, Saint Louis, Missouri 63130</wicri:regionArea><wicri:noRegion>Missouri 63130</wicri:noRegion></affiliation></author><author><name sortKey="Irvin, Anthony J" sort="Irvin, Anthony J" uniqKey="Irvin A" first="Anthony J." last="Irvin">Anthony J. Irvin</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Earth and Space Sciences, University of Washington, Seattle, Washington 98195</wicri:regionArea><orgName type="university">Université de Washington</orgName><placeName><settlement type="city">Seattle</settlement><region type="state">Washington (État)</region></placeName></affiliation></author><author><name sortKey="Bunch, Theodore E" sort="Bunch, Theodore E" uniqKey="Bunch T" first="Theodore E." last="Bunch">Theodore E. Bunch</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Geology, Northern Arizona University, Flagstaff, Arizona 94035</wicri:regionArea><wicri:noRegion>Arizona 94035</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Meteoritics & Planetary Science</title><idno type="ISSN">1086-9379</idno><idno type="eISSN">1945-5100</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2009-09">2009-09</date><biblScope unit="volume">44</biblScope><biblScope unit="issue">9</biblScope><biblScope unit="page" from="1287">1287</biblScope><biblScope unit="page" to="1322">1322</biblScope></imprint><idno type="ISSN">1086-9379</idno></series><idno type="istex">7DCC79B89A3A07F99158537CE0F102036A3A6395</idno><idno type="DOI">10.1111/j.1945-5100.2009.tb01223.x</idno><idno type="ArticleID">MAPS1223</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1086-9379</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Abstract— We present new compositional data for 30 lunar stones representing about 19 meteorites. Most have iron concentrations intermediate to those of the numerous feldspathic lunar meteorites (3–7% FeO) and the basaltic lunar meteorites (17–23% FeO). All but one are polymict breccias. Some, as implied by their intermediate composition, are mainly mixtures of brecciated anorthosite and mare basalt, with low concentrations of incompatible elements such as Sm (1–3 μg/g). These breccias likely originate from points on the Moon where mare basalt has mixed with material of the FHT (Feldspathic Highlands Terrane). Others, however, are not anorthosite‐basalt mixtures. Three (17–75 μ/g Sm) consist mainly of nonmare mafic material from the nearside PKT (Procellarum KREEP Terrane) and a few are ternary mixtures of material from the FHT, PKT, and maria. Some contain mafic, nonmare lithologies like anorthositic norites, norites, gabbronorites, and troctolite. These breccias are largely unlike breccias of the Apollo collection in that they are poor in Sm as well as highly feldspathic anorthosite such as that common at the Apollo 16 site. Several have high Th/Sm compared to Apollo breccias. Dhofar 961, which is olivine gabbronoritic and moderately rich in Sm, has lower Eu/Sm than Apollo samples of similar Sm concentration. This difference indicates that the carrier of rare earth elements is not KREEP, as known from the Apollo missions. On the basis of our present knowledge from remote sensing, among lunar meteorites Dhofar 961 is the one most likely to have originated from South Pole‐Aitken basin on the lunar far side.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Washington (État)</li></region><settlement><li>Seattle</li></settlement><orgName><li>Université de Washington</li></orgName></list><tree><country name="États-Unis"><noRegion><name sortKey="Korotev, Randy L" sort="Korotev, Randy L" uniqKey="Korotev R" first="Randy L." last="Korotev">Randy L. Korotev</name></noRegion><name sortKey="Bunch, Theodore E" sort="Bunch, Theodore E" uniqKey="Bunch T" first="Theodore E." last="Bunch">Theodore E. Bunch</name><name sortKey="Irvin, Anthony J" sort="Irvin, Anthony J" uniqKey="Irvin A" first="Anthony J." last="Irvin">Anthony J. Irvin</name><name sortKey="Jolliff, Bradley L" sort="Jolliff, Bradley L" uniqKey="Jolliff B" first="Bradley L." last="Jolliff">Bradley L. Jolliff</name><name sortKey="Zeigler, Ryan A" sort="Zeigler, Ryan A" uniqKey="Zeigler R" first="Ryan A." last="Zeigler">Ryan A. Zeigler</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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