Source:http://linkedlifedata.com/resource/pubmed/id/17835894
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
5079
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| pubmed:dateCreated |
2010-6-8
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| pubmed:abstractText |
To understand magmatism at convergent margins, one must know the origin of their characteristic, plagioclase-rich, high-alumina basalts (HABs). Wet melting experiments on basalts at 3 kilobars yielded high-alumina liquids and a coexisting mineral assemblage with little or no plagioclase. An isothermal pressure drop to 1 kilobar caused 20 to 30 percent plagioclase crystallization in these melts, while mafic minerals underwent limited crystallization or even resorption. These results suggest that hydrous (>/=4 percent H(2)O) HAB liquids, presumably formed by fractionation of a hydrous basalt at depth, will precipitate voluminous plagioclase as pressure drops during ascent and eruption. Plagioclase accumulation is not necessarily required to explain the petrogenesis of plagioclase-rich HAB.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
|
| pubmed:month |
Oct
|
| pubmed:issn |
0036-8075
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:day |
2
|
| pubmed:volume |
258
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| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
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| pubmed:pagination |
112-5
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| pubmed:year |
1992
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| pubmed:articleTitle |
An experiment-based model for the petrogenesis of high-alumina basalts.
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| pubmed:publicationType |
Journal Article
|