Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga Himal
Re-examination of three specimens from the Kanchenjunga Himal of Nepal via in situ Lu-Hf garnet geochronology yields evidence of multiple garnet growth events. Spot analyses from grain cores in two specimens define Paleozoic regressions whereas analyses from grain rims in the same specimens define l...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-05-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987124000057 |
| _version_ | 1797346017100693504 |
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| author | Kyle P. Larson John M. Cottle Mark Button Brendan Dyck Iva Lihter Sudip Shrestha |
| author_facet | Kyle P. Larson John M. Cottle Mark Button Brendan Dyck Iva Lihter Sudip Shrestha |
| author_sort | Kyle P. Larson |
| collection | DOAJ |
| description | Re-examination of three specimens from the Kanchenjunga Himal of Nepal via in situ Lu-Hf garnet geochronology yields evidence of multiple garnet growth events. Spot analyses from grain cores in two specimens define Paleozoic regressions whereas analyses from grain rims in the same specimens define low-precision regressions consistent with the timing of Himalayan orogenesis. These dates contrast with previously published low dispersion, ca. 290 Ma isotope dissolution (ID) Lu-Hf garnet dates for the same rocks. Modelling of Lu and spot age distribution in representative grains from the specimens examined yields calculated dates that approximate the Permian-age regressions through the original ID data. These findings demonstrate that it is possible to generate low dispersion ID Lu-Hf data from multi-generational garnet with significantly different-age growth events when approximately equal proportions of the different age reservoirs are included in multi-component aliquots. |
| first_indexed | 2024-03-08T11:26:41Z |
| format | Article |
| id | doaj.art-49f04dacfbd543148c23e54d9fed03aa |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-08T11:26:41Z |
| publishDate | 2024-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-49f04dacfbd543148c23e54d9fed03aa2024-01-26T05:32:28ZengElsevierGeoscience Frontiers1674-98712024-05-01153101781Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga HimalKyle P. Larson0John M. Cottle1Mark Button2Brendan Dyck3Iva Lihter4Sudip Shrestha5Department of Earth, Environmental and Geographic Sciences, University of British Columbia, Okanagan, Kelowna, Canada; Corresponding author.Department of Earth Science, University of California, Santa Barbara, USAFipke Laboratory for Trace Element Research, University of British Columbia, Okanagan, Kelowna, CanadaDepartment of Earth, Environmental and Geographic Sciences, University of British Columbia, Okanagan, Kelowna, CanadaDepartment of Earth, Environmental and Geographic Sciences, University of British Columbia, Okanagan, Kelowna, CanadaFipke Laboratory for Trace Element Research, University of British Columbia, Okanagan, Kelowna, CanadaRe-examination of three specimens from the Kanchenjunga Himal of Nepal via in situ Lu-Hf garnet geochronology yields evidence of multiple garnet growth events. Spot analyses from grain cores in two specimens define Paleozoic regressions whereas analyses from grain rims in the same specimens define low-precision regressions consistent with the timing of Himalayan orogenesis. These dates contrast with previously published low dispersion, ca. 290 Ma isotope dissolution (ID) Lu-Hf garnet dates for the same rocks. Modelling of Lu and spot age distribution in representative grains from the specimens examined yields calculated dates that approximate the Permian-age regressions through the original ID data. These findings demonstrate that it is possible to generate low dispersion ID Lu-Hf data from multi-generational garnet with significantly different-age growth events when approximately equal proportions of the different age reservoirs are included in multi-component aliquots.http://www.sciencedirect.com/science/article/pii/S1674987124000057Lu-Hf geochronologyIn situ Lu-Hf geochronologyKanchenjunga Himal |
| spellingShingle | Kyle P. Larson John M. Cottle Mark Button Brendan Dyck Iva Lihter Sudip Shrestha Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga Himal Geoscience Frontiers Lu-Hf geochronology In situ Lu-Hf geochronology Kanchenjunga Himal |
| title | Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga Himal |
| title_full | Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga Himal |
| title_fullStr | Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga Himal |
| title_full_unstemmed | Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga Himal |
| title_short | Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology, Kanchenjunga Himal |
| title_sort | investigating low dispersion isotope dissolution lu hf garnet dates via in situ lu hf geochronology kanchenjunga himal |
| topic | Lu-Hf geochronology In situ Lu-Hf geochronology Kanchenjunga Himal |
| url | http://www.sciencedirect.com/science/article/pii/S1674987124000057 |
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