Appendix A: LA-ICP-MS results (Laser-ablation inductively coupled plasma mass spectrometer) from monazite Moacir standard
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2011
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| _version_ | 1867168099996794880 |
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| author | Langone, Antonio Braga, Roberto Massonne, Hans-Joachim Tiepolo, Massimo |
| author_facet | Langone, Antonio Braga, Roberto Massonne, Hans-Joachim Tiepolo, Massimo |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Three samples of garnet-kyanite paragneiss from the Variscan Ulten Zone (Northern Italy) were studied in detail for U-Th-Pb monazite dating. Monazite in these gneisses is abundant, shows highly variable grain size and occupies different textural positions: within the matrix, as inclusion in garnet and kyanite, within apatite aggregates. Monazite shows different deformation features as a function of the textural position: enclosed (shielded) monazite is generally more fractured than matrix (unshielded) monazite. The integration of textural information with deformation features and in situ U-Th-Pb analyses by LA-ICP-MS indicates that there is no direct correlation between textural site and monazite ages. Old ages of 351-343 Ma, determined on portions of large matrix (unshielded) monazite and on rare domains of monazite shielded by garnet, have been related to a prograde stage of the Variscan metamorphic evolution of the Ulten Zone. Ages of 330-326 Ma, which are related to the thermal peak, are recorded by small matrix monazite, external domains of large matrix monazite, and by (domains of) fractured monazite enclosed in garnet and kyanite. Large, old unshielded grains formed as blasts during the prograde metamorphic history and survived the peak metamorphism during which crystallisation/re-crystallisation partially occurred. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_764046 |
| institution | PANGAEA |
| language | en |
| publishDate | 2011 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Appendix A: LA-ICP-MS results (Laser-ablation inductively coupled plasma mass spectrometer) from monazite Moacir standard Langone, Antonio Braga, Roberto Massonne, Hans-Joachim Tiepolo, Massimo Age, 206Pb/232Th Lead-Thorium; Age, 206Pb/238U Lead-Uranium; Age, 207Pb/235U Lead-Uranium; Age, mineral; Analysis; Error, absolute; Error, relative; Lead-206/Uranium-238 ratio; Lead-207/Uranium-235 ratio; Lead-208/Thorium-232 ratio; Position; Run Three samples of garnet-kyanite paragneiss from the Variscan Ulten Zone (Northern Italy) were studied in detail for U-Th-Pb monazite dating. Monazite in these gneisses is abundant, shows highly variable grain size and occupies different textural positions: within the matrix, as inclusion in garnet and kyanite, within apatite aggregates. Monazite shows different deformation features as a function of the textural position: enclosed (shielded) monazite is generally more fractured than matrix (unshielded) monazite. The integration of textural information with deformation features and in situ U-Th-Pb analyses by LA-ICP-MS indicates that there is no direct correlation between textural site and monazite ages. Old ages of 351-343 Ma, determined on portions of large matrix (unshielded) monazite and on rare domains of monazite shielded by garnet, have been related to a prograde stage of the Variscan metamorphic evolution of the Ulten Zone. Ages of 330-326 Ma, which are related to the thermal peak, are recorded by small matrix monazite, external domains of large matrix monazite, and by (domains of) fractured monazite enclosed in garnet and kyanite. Large, old unshielded grains formed as blasts during the prograde metamorphic history and survived the peak metamorphism during which crystallisation/re-crystallisation partially occurred. |
| title | Appendix A: LA-ICP-MS results (Laser-ablation inductively coupled plasma mass spectrometer) from monazite Moacir standard |
| topic | Age, 206Pb/232Th Lead-Thorium; Age, 206Pb/238U Lead-Uranium; Age, 207Pb/235U Lead-Uranium; Age, mineral; Analysis; Error, absolute; Error, relative; Lead-206/Uranium-238 ratio; Lead-207/Uranium-235 ratio; Lead-208/Thorium-232 ratio; Position; Run |
| url | https://doi.org/10.1594/PANGAEA.764046 |