Details

Autor(en) / Beteiligte

• Zou, Xinyu
• Qin, Kezhang
• Han, Xinlei
• Li, Guangming
• Evans, Noreen J.
• Li, Zhenzhen
• Yang, Wei

Titel

Insight into zircon REE oxy-barometers: A lattice strain model perspective

Ist Teil von

• Earth and planetary science letters, 2019-01, Vol.506, p.87-96

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Zircon rare earth element (REE) oxy-barometers have been widely used to calculate magma oxygen fugacity. However, sometimes confusing results are obtained, such as extremely reduced oxygen fugacity in Hadean magmas (e.g. ΔFMQ−8), extremely oxidized oxygen fugacity in post-Hadean magmas (e.g. ΔFMQ+10) and contradictory oxygen fugacities recorded in ore-related porphyry magmas (ΔNNO+5 vs ΔNNO+1). To address these issues, this work reviews the underlying assumption of zircon REE oxy-barometers, the lattice strain model. By introducing a geochemical filter to identify clean, inclusion-free zircon and a new parameter δK to constrain the Dzircon/wholerock deviation from the lattice strain model, we systematically re-evaluate the common zircon REE oxy-barometers, address the issues noted in Hadean, post-Hadean and ore-related magmas, and provide an alternate approach to using zircon REE in studies of magmatic processes. •Defining “clean zircon” and “δK” through lattice strain model.•Re-evaluating the robustness of common zircon REE oxy-barometers.•Addressing dilemmas in extreme and contradictory oxygen fugacities.•Providing an alternate approach to using zircon REE signatures.