MONAZITE-XENOTIME THERMOCHRONOMETRY AND AL2SIO5 REACTION TEXTURES IN THE PICURIS RANGE, NORTHERN NEW MEXICO, USA: NEW EVIDENCE FOR A 1450-1400 MA OROGENIC EVENT
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Daniel Ch.G. | |
dc.contributor.author | Pyle J.M. | |
dc.date.accessioned | 2024-08-03T06:10:59Z | |
dc.date.available | 2024-08-03T06:10:59Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=10501007 | |
dc.identifier.citation | Journal of Petrology, 2006, 47, 1, 97 | |
dc.identifier.issn | 0022-3530 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/44626 | |
dc.description.abstract | Al2SiO5 reaction textures in aluminous schist and quartzite of the northern Picuris range, north-central New Mexico, record a paragenetic sequence of kyanite to sillimanite to andalusite, consistent with a clockwise P–T loop, with minor decompression near the Al2SiO5 triple-point. Peak metamorphic temperatures are estimated at 510–525°C, at 4·0–4·2?kbar. Kyanite and fibrolite are strongly deformed; some prismatic sillimanite, and all andalusite are relatively undeformed. Monazite occurs as inclusions within kyanite, mats of sillimanite and centimetre-scale porphyroblasts of andalusite, and is typically aligned subparallel to the dominant regional foliation (S0/S1 or S2) and extension lineation (L1). Back-scatter electron images and X-ray maps of monazite reveal distinct core, intermediate and rim compositional domains. Monazite–xenotime thermometry from the intermediate and rim domains yields temperatures of 405–470°C (±50°C) and 500–520°C (±50°C), respectively, consistent with the prograde to peak metamorphic growth of monazite. In situ, ion microprobe analyses from five monazites yield an upper intercept age of 1417 ± 9?Ma. Near-concordant to concordant analyses yield 207Pb–206Pb ages from 1434 ± 12?Ma (core) to 1390 ± 20?Ma (rim). We find no evidence of older regional metamorphism related to the ?1650?Ma Mazatzal Orogeny. | |
dc.subject | Al2SiO5 | |
dc.subject | metamorphism | |
dc.subject | monazite | |
dc.subject | thermochronometry | |
dc.subject | triple-point | |
dc.title | MONAZITE-XENOTIME THERMOCHRONOMETRY AND AL2SIO5 REACTION TEXTURES IN THE PICURIS RANGE, NORTHERN NEW MEXICO, USA: NEW EVIDENCE FOR A 1450-1400 MA OROGENIC EVENT | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru