| Abstract: | A unique rock composed almost entirely of equal proportions of monazite and xenotime occurs as a small, lenticular body (2 ?? 0.5 ?? 0.3 m) in association with paragneiss, migmatite, and Canada Hill Granite in an outcrop in the Hudson Highlands of southeastern New York. The paragneiss contains detrital zircon (207Pb/206Pb ages of 1150-1460 Ma), monazite, and xenotime (both dated at about 1000 Ma). Zircons from the monazite-xenotime gneiss contain dark, rounded cores and clear rims, a morphology suggestive of derivation from the paragneiss, with subsequent metamorphic overgrowth. We conclude, based on results from xenotime and zircon rims, that the monazite-xenotime gneiss formed at about 985 Ma. Based on zircon morphology and age relations within the outcrop, we prefer a metasomatic origin over other possibilities such as a paleo-placer or anatectic restite. -from Authors |
| Genre: | Article |
| ProdID: | 70015857 |
| Citation Author: | Aleinikoff, J. N.; Grauch, R. I. |
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| Citation End Page: | 546 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Journal of Science |
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| Citation Number Of Pages: | 25 |
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| Citation Search Results Text: | U-Pb geochronologic constraints on the origin of a unique monazite- xenotime gneiss, Hudson Highlands, New York; 1990; Article; Journal; American Journal of Science; Aleinikoff, J. N.; Grauch, R. I. |
| Citation Start Page: | 522 |
| Citation Volume: | 290 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | U-Pb geochronologic constraints on the origin of a unique monazite- xenotime gneiss, Hudson Highlands, New York; 1990; Article; Journal; American Journal of Science; Aleinikoff, J. N.; Grauch, R. I. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
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