Patias, Daniel, Zhou, Renjie, Wang, Xin, Aitchison, Jonathan C. (2024) New approach to constraining Cr-mineralization and forearc processes: U-Pb dating and geochemistry of titanites in chromitites of the Dun Mountain ophiolite belt (New Zealand). Ore Geology Reviews, 174. 106292 doi:10.1016/j.oregeorev.2024.106292
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | New approach to constraining Cr-mineralization and forearc processes: U-Pb dating and geochemistry of titanites in chromitites of the Dun Mountain ophiolite belt (New Zealand) | ||
| Journal | Ore Geology Reviews | ||
| Authors | Patias, Daniel | Author | |
| Zhou, Renjie | Author | ||
| Wang, Xin | Author | ||
| Aitchison, Jonathan C. | Author | ||
| Year | 2024 | Volume | < 174 > |
| Page(s) | 106292 | ||
| URL | |||
| DOI | doi:10.1016/j.oregeorev.2024.106292Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 17658867 | Long-form Identifier | mindat:1:5:17658867:2 |
| GUID | 0 | ||
| Full Reference | Patias, Daniel, Zhou, Renjie, Wang, Xin, Aitchison, Jonathan C. (2024) New approach to constraining Cr-mineralization and forearc processes: U-Pb dating and geochemistry of titanites in chromitites of the Dun Mountain ophiolite belt (New Zealand). Ore Geology Reviews, 174. 106292 doi:10.1016/j.oregeorev.2024.106292 | ||
| Plain Text | Patias, Daniel, Zhou, Renjie, Wang, Xin, Aitchison, Jonathan C. (2024) New approach to constraining Cr-mineralization and forearc processes: U-Pb dating and geochemistry of titanites in chromitites of the Dun Mountain ophiolite belt (New Zealand). Ore Geology Reviews, 174. 106292 doi:10.1016/j.oregeorev.2024.106292 | ||
| In | Link this record to the correct parent record (if possible) | ||
| Abstract/Notes | Ophiolites provide important insights for understanding of subduction zones and forearc mantle-wedge geodynamics. Specifically, within the mantle section, podiform chromitites may record processes associated with development of highly depleted supra-subduction ophiolites, chromium mineralization and subsequent metasomatism. This study explores the first ever U-Pb isotope and trace-element data obtained from titanites in chromitites of the Dun Mountain ophiolite belt in New Zealand. Titanite is unusual in such geochemically depleted rocks and a low recovery rate attests to its rarity (ca. 190 grains from 100 kg of material from two chromitite samples). Results of U-Pb geochronology and geochemistry for the titanites constrain both the mid-Permian timing of chromitite crystallization (∼283 Ma) and later metasomatism (∼272 Ma). Older titanite grains are depleted in HFSE and have flat REE chondrite-normalized patterns reflecting a high-degree of partial melting in depths greater than the plagioclase stability field (>15 km). Younger titanites show enrichment in HFSE, depletion in LREE and negative Eu anomalies, revealing melt extraction at shallower depths (<15 km) that likely record refertilization of the mantle-wedge. Results highlight the potential of titanites in the acquisition of direct geochronological and geochemical constraints from rocks commonly devoid of minerals suitable for U-Pb dating. | ||
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