Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components
Abstract— Queen Alexandra Range (QUE) 94281, a lunar meteorite recently discovered in Antarctica, is a glassy‐matrix, clast‐rich regolith breccia containing a mixture of mafic, volcanic‐glass and gabbroic constituents and a diverse set of highland constituents. In thin section, the clast assemblage...
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crwiley:10.1111/j.1945-5100.1998.tb01666.x 2023-12-03T10:13:17+01:00 Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components JOLLIFF, BRADLEY L. KOROTEV, RANDY L. ROCKOW, KAYLYNN M. 1998 http://dx.doi.org/10.1111/j.1945-5100.1998.tb01666.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1998.tb01666.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1998.tb01666.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 33, issue 4, page 581-601 ISSN 1086-9379 1945-5100 Space and Planetary Science Geophysics journal-article 1998 crwiley https://doi.org/10.1111/j.1945-5100.1998.tb01666.x 2023-11-09T13:31:00Z Abstract— Queen Alexandra Range (QUE) 94281, a lunar meteorite recently discovered in Antarctica, is a glassy‐matrix, clast‐rich regolith breccia containing a mixture of mafic, volcanic‐glass and gabbroic constituents and a diverse set of highland constituents. In thin section, the clast assemblage is dominated by coarse mineral debris from a shallow intrusive or hypabyssal setting, or from deep within a thick mare flow. Abundant coarse‐grained pyroxene clasts have fine‐scale exsolution lamellae and compositions similar to pyroxenes of known lunar very‐low‐Ti (VLT) basalts and other lunar meteorites of basaltic composition. Pyroxene compositions follow Fe‐enrichment extending to hedenbergite, which is associated with fayalite and cristobalite, indicating slow cooling. We refer to the protolith of the crystalline VLT component as VLT gabbro. Fragments of pyroclastic glasses that have high Fe and low Ti concentrations, similar to the pyroclastic green glasses known from Apollo samples, are common. Lithic clasts include abundant subrounded, glassy to cryptocrystalline, aluminous (∼17–30 wt% Al 2 O 3 ) KREEP‐poor melt breccias of highland origin and a variety of other feldspathic impactites. On the basis of composition of our subsamples, QUE 94281 consists of ∼54 wt% mafic or “mare” components and 46 wt% feldspathic or “highland” components. The bulk composition of QUE 94281 is similar to that of Yamato (Y) 793274, but QUE 94281 has slightly greater concentrations of some siderophile elements and slightly lower concentrations of those elements contributed mainly by mafic constituents. Differences in siderophile element concentrations are consistent with longer surface exposure of QUE 94281. Minor differences in trace element variations of subsamples of the two meteorites suggest subtle differences in the composition of their highland constituents. Nonetheless, the overall similarity of compositions supports the possibility that they were ejected from the same source region on the Moon. The crystalline VLT component ... Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library (via Crossref) Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) Meteoritics & Planetary Science 33 4 581 601 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Space and Planetary Science Geophysics |
spellingShingle |
Space and Planetary Science Geophysics JOLLIFF, BRADLEY L. KOROTEV, RANDY L. ROCKOW, KAYLYNN M. Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components |
topic_facet |
Space and Planetary Science Geophysics |
description |
Abstract— Queen Alexandra Range (QUE) 94281, a lunar meteorite recently discovered in Antarctica, is a glassy‐matrix, clast‐rich regolith breccia containing a mixture of mafic, volcanic‐glass and gabbroic constituents and a diverse set of highland constituents. In thin section, the clast assemblage is dominated by coarse mineral debris from a shallow intrusive or hypabyssal setting, or from deep within a thick mare flow. Abundant coarse‐grained pyroxene clasts have fine‐scale exsolution lamellae and compositions similar to pyroxenes of known lunar very‐low‐Ti (VLT) basalts and other lunar meteorites of basaltic composition. Pyroxene compositions follow Fe‐enrichment extending to hedenbergite, which is associated with fayalite and cristobalite, indicating slow cooling. We refer to the protolith of the crystalline VLT component as VLT gabbro. Fragments of pyroclastic glasses that have high Fe and low Ti concentrations, similar to the pyroclastic green glasses known from Apollo samples, are common. Lithic clasts include abundant subrounded, glassy to cryptocrystalline, aluminous (∼17–30 wt% Al 2 O 3 ) KREEP‐poor melt breccias of highland origin and a variety of other feldspathic impactites. On the basis of composition of our subsamples, QUE 94281 consists of ∼54 wt% mafic or “mare” components and 46 wt% feldspathic or “highland” components. The bulk composition of QUE 94281 is similar to that of Yamato (Y) 793274, but QUE 94281 has slightly greater concentrations of some siderophile elements and slightly lower concentrations of those elements contributed mainly by mafic constituents. Differences in siderophile element concentrations are consistent with longer surface exposure of QUE 94281. Minor differences in trace element variations of subsamples of the two meteorites suggest subtle differences in the composition of their highland constituents. Nonetheless, the overall similarity of compositions supports the possibility that they were ejected from the same source region on the Moon. The crystalline VLT component ... |
format |
Article in Journal/Newspaper |
author |
JOLLIFF, BRADLEY L. KOROTEV, RANDY L. ROCKOW, KAYLYNN M. |
author_facet |
JOLLIFF, BRADLEY L. KOROTEV, RANDY L. ROCKOW, KAYLYNN M. |
author_sort |
JOLLIFF, BRADLEY L. |
title |
Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components |
title_short |
Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components |
title_full |
Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components |
title_fullStr |
Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components |
title_full_unstemmed |
Geochemistry and petrology of lunar meteorite Queen Alexandra Range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components |
title_sort |
geochemistry and petrology of lunar meteorite queen alexandra range 94281, a mixed mare and highland regolith breccia, with special emphasis on very‐low‐titanium mafic components |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1111/j.1945-5100.1998.tb01666.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1998.tb01666.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1998.tb01666.x |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Yamato |
geographic_facet |
Yamato |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Meteoritics & Planetary Science volume 33, issue 4, page 581-601 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.1998.tb01666.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
33 |
container_issue |
4 |
container_start_page |
581 |
op_container_end_page |
601 |
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1784260004747935744 |