Source:http://linkedlifedata.com/resource/pubmed/id/17783768
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| Predicate | Object |
|---|---|
| rdf:type | |
| pubmed:issue |
4893
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| pubmed:dateCreated |
2010-6-8
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| pubmed:abstractText |
A clast of spinel troctolite containing 8 percent cordierite (Mg(2)Al(4)Si(5)O(18)) has been identified among the constituents of Apollo 15 regolith breccia 15295. The cordierite and associated anorthite, forsteritic olivine, and pleonaste spinel represent a new, Mg-rich lunar highlands lithology that formed by metamorphism of an igneous spinel cumulate. The cordierite-forsterite pair in the assemblage is stable at a maximum pressure of 2.5 kilobars, equivalent to a depth of 50 kilometers, or 10 kilometers above the lunar crust-mantle boundary. The occurrence of the clast indicates that spinel cumulates are a more important constituent of the lower lunar crust than has been recognized. The rarity of cordierite-spinel troctolite among lunar rock samples suggests that it is excavated only by large impact events, such as the one that formed the adjacent Imbrium Basin.
|
| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Feb
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| pubmed:issn |
0036-8075
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| pubmed:author | |
| pubmed:issnType |
Print
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| pubmed:day |
17
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| pubmed:volume |
243
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
925-8
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| pubmed:year |
1989
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| pubmed:articleTitle |
Cordierite-spinel troctolite, a new magnesium-rich lithology from the lunar highlands.
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| pubmed:publicationType |
Journal Article
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