A new approach to SHRIMP II zircon U-Th disequilibrium dating
U-Th disequilibrium dating of zircon is used to determine the crystallisation age of zircon crystals which formed ≲350 ka. In this work we present a new analytical and data reduction workflow for zircon U-Th disequilibrium analysis using a Sensitive High Resolution Ion MicroProbe (SHRIMP), specifica...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
PERGAMON-ELSEVIER SCIENCE LTD
2022
|
| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DP160102427 http://hdl.handle.net/20.500.11937/90781 |
| _version_ | 1848765426118426624 |
|---|---|
| author | Marsden, Ruby C. Kirkland, Christopher Danišík, Martin Daggitt, M.L. Ahn, U.S. Friedrichs, B. Evans, Noreen |
| author_facet | Marsden, Ruby C. Kirkland, Christopher Danišík, Martin Daggitt, M.L. Ahn, U.S. Friedrichs, B. Evans, Noreen |
| author_sort | Marsden, Ruby C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | U-Th disequilibrium dating of zircon is used to determine the crystallisation age of zircon crystals which formed ≲350 ka. In this work we present a new analytical and data reduction workflow for zircon U-Th disequilibrium analysis using a Sensitive High Resolution Ion MicroProbe (SHRIMP), specifically the SHRIMP II instrument at Curtin University. This is the first zircon U-Th disequilibrium work carried out on the SHRIMP II, and the workflow was investigated with both 3 nA and 6 nA primary beam intensities, using an inverted mass run sequence (from high to low mass). The data reduction was affected by complex background corrections on the 230Th mass peak, extremely low counts on 230Th, and by a logarithmic high mass tail from shouldering mass peaks. A new approach to data reduction and a new computer program (Crayfish) written in Python is presented to address these complexities. Crayfish aids in visualisation of the raw count data from SHRIMP.pd files, allowing for more interaction with raw data during reduction, and formally propagates uncertainties from measurements to age. A case study testing the new approach was undertaken using trachytic samples from Jeju Island, South Korea, an active volcanic field and a UNESCO world heritage site. The newly derived SHRIMP crystallisation ages of 13 ± 27 to 212 ± 324 ka (2σ uncertainties) replicate measurements performed using a CAMECA IMS 1280. |
| first_indexed | 2025-11-14T11:35:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-90781 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:35:03Z |
| publishDate | 2022 |
| publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-907812024-02-06T03:11:26Z A new approach to SHRIMP II zircon U-Th disequilibrium dating Marsden, Ruby C. Kirkland, Christopher Danišík, Martin Daggitt, M.L. Ahn, U.S. Friedrichs, B. Evans, Noreen Science & Technology Technology Physical Sciences Computer Science, Interdisciplinary Applications Geosciences, Multidisciplinary Computer Science Geology U-Th disequilibrium dating SHRIMP II Zircon Quaternary Geochronology OXYGEN-ISOTOPE PB DIFFUSION GERMANY SERIES EIFEL U-Th disequilibrium dating of zircon is used to determine the crystallisation age of zircon crystals which formed ≲350 ka. In this work we present a new analytical and data reduction workflow for zircon U-Th disequilibrium analysis using a Sensitive High Resolution Ion MicroProbe (SHRIMP), specifically the SHRIMP II instrument at Curtin University. This is the first zircon U-Th disequilibrium work carried out on the SHRIMP II, and the workflow was investigated with both 3 nA and 6 nA primary beam intensities, using an inverted mass run sequence (from high to low mass). The data reduction was affected by complex background corrections on the 230Th mass peak, extremely low counts on 230Th, and by a logarithmic high mass tail from shouldering mass peaks. A new approach to data reduction and a new computer program (Crayfish) written in Python is presented to address these complexities. Crayfish aids in visualisation of the raw count data from SHRIMP.pd files, allowing for more interaction with raw data during reduction, and formally propagates uncertainties from measurements to age. A case study testing the new approach was undertaken using trachytic samples from Jeju Island, South Korea, an active volcanic field and a UNESCO world heritage site. The newly derived SHRIMP crystallisation ages of 13 ± 27 to 212 ± 324 ka (2σ uncertainties) replicate measurements performed using a CAMECA IMS 1280. 2022 Journal Article http://hdl.handle.net/20.500.11937/90781 10.1016/j.cageo.2021.104947 English http://purl.org/au-research/grants/arc/DP160102427 PERGAMON-ELSEVIER SCIENCE LTD restricted |
| spellingShingle | Science & Technology Technology Physical Sciences Computer Science, Interdisciplinary Applications Geosciences, Multidisciplinary Computer Science Geology U-Th disequilibrium dating SHRIMP II Zircon Quaternary Geochronology OXYGEN-ISOTOPE PB DIFFUSION GERMANY SERIES EIFEL Marsden, Ruby C. Kirkland, Christopher Danišík, Martin Daggitt, M.L. Ahn, U.S. Friedrichs, B. Evans, Noreen A new approach to SHRIMP II zircon U-Th disequilibrium dating |
| title | A new approach to SHRIMP II zircon U-Th disequilibrium dating |
| title_full | A new approach to SHRIMP II zircon U-Th disequilibrium dating |
| title_fullStr | A new approach to SHRIMP II zircon U-Th disequilibrium dating |
| title_full_unstemmed | A new approach to SHRIMP II zircon U-Th disequilibrium dating |
| title_short | A new approach to SHRIMP II zircon U-Th disequilibrium dating |
| title_sort | new approach to shrimp ii zircon u-th disequilibrium dating |
| topic | Science & Technology Technology Physical Sciences Computer Science, Interdisciplinary Applications Geosciences, Multidisciplinary Computer Science Geology U-Th disequilibrium dating SHRIMP II Zircon Quaternary Geochronology OXYGEN-ISOTOPE PB DIFFUSION GERMANY SERIES EIFEL |
| url | http://purl.org/au-research/grants/arc/DP160102427 http://hdl.handle.net/20.500.11937/90781 |