期刊
TERRA NOVA
卷 34, 期 3, 页码 193-200出版社
WILEY
DOI: 10.1111/ter.12577
关键词
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资金
- Australian Research Council [ARC-IH130200012, ARC-LP190100146]
- European Union [793978]
- Australian Government
- Government of Western Australia
- Marie Curie Actions (MSCA) [793978] Funding Source: Marie Curie Actions (MSCA)
This article discusses the formation process of high to ultra-high temperature granulitic terranes, and evaluates the effects of geothermal conditions on their formation using analytical and numerical models. The results of the numerical experiments suggest that variations in radiogenic heat production and shortening rates play important roles in determining the geothermal conditions and rock formation.
Long-lived high to ultra-high temperature (HT-UHT) granulitic terranes formed throughout Earth's history. Yet, the detailed processes involved in their formation remain unresolved and notably the sequence of appearance and duration of migmatisation and granulites conditions in the orogenic cycle. These processes can be evaluated by analytical and numerical models. First, solving the steady-state heat equation allows underlining the interdependency of the parameters controlling the crustal geotherm at thermal equilibrium. Second, performing two-dimensional thermo-mechanical experiments of an orogenic cycle, from shortening to gravitational collapse, allows to consider non-steady-state geotherms and understand how deformation velocity may affect the relative timing of migmatite and granulite formation. These numerical experiments with elevated radiogenic heat production and slow shortening rates allow the formation of large volumes of prograde migmatites and granulites going through the sillimanite field as observed in many HT-UHT terranes. Finally, the interplay between these parameters can explain the difference in predicted pressure-temperature-time paths that can be compared with the natural rock archive.
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