| Abstract: | Oxygen isotopic analysis of wollastonites from the Willsboro Mine, Adirondack Mountains, New York reveals a 400-ft wide zone of 18O depletion at anorthosite contacts. Values of ??18O vary more sharply with distance and are lower (to -1.3) than any yet reported for a granulite fades terrain. Exchange with circulating hot meteoric water best explains these results and implies that the anorthosite was emplaced at relatively shallow depths, <10 km, in marked contrast to the depth of granulite fades metamorphism (23 km). These 18O depletions offer the first strong evidence for shallow emplacement of anorthosite within the Grenville Province and suggest that regional metamorphism was a later and tectonically distinct event. ?? 1982 Nature Publishing Group. |
| Genre: | Article |
| ProdID: | 70011557 |
| Citation Author: | Valley, J. W.; O'Neil, J. R. |
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| Citation End Page: | 500 |
| Citation Issue: | 5892 |
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| Citation Language: | English |
| Citation Larger Work Title: | Nature |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Oxygen isotope evidence for shallow emplacement of Adirondack anorthosite; 1982; Article; Journal; Nature; Valley, J. W.; O‘Neil, J. R. |
| Citation Start Page: | 497 |
| Citation Volume: | 300 |
| Citation Year: | 1982 |
| Type: | citation/reference |
| Text: | Oxygen isotope evidence for shallow emplacement of Adirondack anorthosite; 1982; Article; Journal; Nature; Valley, J. W.; O‘Neil, J. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1038/300497a0 |
| Date Other: | Fri, 1 Jan 1982 00:00 -0600 |
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