Thin-section detrital zircon geochronology mitigates bias in provenance investigations
Detrital zircon U–Pb geochronology has enabled advances in the understanding of sediment provenance, transportation pathways, and the depositional age of sedimentary packages. However, sample selection and processing can result in biasing of detrital zircon age spectra. This paper presents a novel a...
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
GEOLOGICAL SOC PUBL HOUSE
2022
|
| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/LP180100199 http://hdl.handle.net/20.500.11937/90918 |
| _version_ | 1848765460405813248 |
|---|---|
| author | Zutterkirch, Isabel C. Kirkland, Christopher Barham, Milo Elders, Chris |
| author_facet | Zutterkirch, Isabel C. Kirkland, Christopher Barham, Milo Elders, Chris |
| author_sort | Zutterkirch, Isabel C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Detrital zircon U–Pb geochronology has enabled advances in the understanding of sediment provenance, transportation pathways, and the depositional age of sedimentary packages. However, sample selection and processing can result in biasing of detrital zircon age spectra. This paper presents a novel approach using in situ detrital zircon U–Pb measurements on thin-sections to provide greater confidence in maximum depositional ages and provenance interpretations. New U–Pb age data of 310 detrital zircon grains from 16 thin-sections of the Triassic Mungaroo Formation from two wells in the Northern Carnarvon Basin, Australia, are presented. Whilst detrital zircon age modes are consistent with previous work, there are some differences in the relative proportions of age modes, which are partly attributed to a lack of small grains in handpicked grain mounts. The relative sample bias is quantified via grain size comparison of dated zircon (in thin-sections or handpicked mounts) relative to all zircons identified in bulk-mounts and thin-sections. The youngest age mode (c. 320–195 Ma) is consistent with an active margin to the north. The dated zircons reveal a single grain defined maximum depositional age of 197 Ma for the upper part of the Mungaroo Formation, suggesting deposition may have continued into the Early Jurassic. |
| first_indexed | 2025-11-14T11:35:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-90918 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:35:36Z |
| publishDate | 2022 |
| publisher | GEOLOGICAL SOC PUBL HOUSE |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-909182023-05-10T01:21:18Z Thin-section detrital zircon geochronology mitigates bias in provenance investigations Zutterkirch, Isabel C. Kirkland, Christopher Barham, Milo Elders, Chris Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology NORTHERN CARNARVON BASIN U-PB GEOCHRONOLOGY HF-ISOTOPE CRUSTAL EVOLUTION DEPOSITIONAL AGES EAST ANTARCTICA PERTH BASIN WEST SHELF RIFT BASIN AUSTRALIA Detrital zircon U–Pb geochronology has enabled advances in the understanding of sediment provenance, transportation pathways, and the depositional age of sedimentary packages. However, sample selection and processing can result in biasing of detrital zircon age spectra. This paper presents a novel approach using in situ detrital zircon U–Pb measurements on thin-sections to provide greater confidence in maximum depositional ages and provenance interpretations. New U–Pb age data of 310 detrital zircon grains from 16 thin-sections of the Triassic Mungaroo Formation from two wells in the Northern Carnarvon Basin, Australia, are presented. Whilst detrital zircon age modes are consistent with previous work, there are some differences in the relative proportions of age modes, which are partly attributed to a lack of small grains in handpicked grain mounts. The relative sample bias is quantified via grain size comparison of dated zircon (in thin-sections or handpicked mounts) relative to all zircons identified in bulk-mounts and thin-sections. The youngest age mode (c. 320–195 Ma) is consistent with an active margin to the north. The dated zircons reveal a single grain defined maximum depositional age of 197 Ma for the upper part of the Mungaroo Formation, suggesting deposition may have continued into the Early Jurassic. 2022 Journal Article http://hdl.handle.net/20.500.11937/90918 10.1144/jgs2021-070 English http://purl.org/au-research/grants/arc/LP180100199 http://creativecommons.org/licenses/by/4.0/ GEOLOGICAL SOC PUBL HOUSE fulltext |
| spellingShingle | Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology NORTHERN CARNARVON BASIN U-PB GEOCHRONOLOGY HF-ISOTOPE CRUSTAL EVOLUTION DEPOSITIONAL AGES EAST ANTARCTICA PERTH BASIN WEST SHELF RIFT BASIN AUSTRALIA Zutterkirch, Isabel C. Kirkland, Christopher Barham, Milo Elders, Chris Thin-section detrital zircon geochronology mitigates bias in provenance investigations |
| title | Thin-section detrital zircon geochronology mitigates bias in provenance investigations |
| title_full | Thin-section detrital zircon geochronology mitigates bias in provenance investigations |
| title_fullStr | Thin-section detrital zircon geochronology mitigates bias in provenance investigations |
| title_full_unstemmed | Thin-section detrital zircon geochronology mitigates bias in provenance investigations |
| title_short | Thin-section detrital zircon geochronology mitigates bias in provenance investigations |
| title_sort | thin-section detrital zircon geochronology mitigates bias in provenance investigations |
| topic | Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology NORTHERN CARNARVON BASIN U-PB GEOCHRONOLOGY HF-ISOTOPE CRUSTAL EVOLUTION DEPOSITIONAL AGES EAST ANTARCTICA PERTH BASIN WEST SHELF RIFT BASIN AUSTRALIA |
| url | http://purl.org/au-research/grants/arc/LP180100199 http://hdl.handle.net/20.500.11937/90918 |