Isotope disequilibrium during anatexis: a case study of contact melting, Sierra Nevada, California
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Isotope disequilibrium caused by the influx of fluids during crustal anatexis
2023, Chemical GeologyBoron and molybdenum isotopic fractionation during crustal anatexis: Constraints from the Conadong leucogranites in the Himalayan Block, South Tibet
2021, Geochimica et Cosmochimica ActaThe role of melting on the geochemical evolution and isotopic variability of an anatectic complex in the Iberian Variscides
2020, LithosCitation Excerpt :Indeed, residue/melt isotopic disequilibrium can take place due to a) insufficient temperature to reach the closure temperature of some of the accessory phases, with which P and/or D elements are compatible, resulting in a significant fractionation (up to >20 εHf units; Tang et al. 2014); and b) chemical diffusivity being sluggish compared with the time frame necessary for melt extraction from the residue (Ayres and Harris 1997; Farina and Stevens 2011; Zeng et al., 2005a, b; Tang et al. 2014; Wolf et al. 2019). These factors suggest that isotopic disequilibrium during anatexis is ubiquitous (e.g. Tommasini and Davies 1997). However, in some cases, even for situations specifically investigated for isotopic disequilibrium, no significant evidence was found (e.g. Wolf et al. 2019).
Geochemistry of high-pressure to ultrahigh-pressure granitic melts produced by decompressional melting of deeply subducted continental crust in the Sulu orogen, east-central China
2020, Geochimica et Cosmochimica ActaCitation Excerpt :To further constrain this issue, it needs to decipher the behavior of accessory minerals during the anatectic processes. Isotope disequilibria between residual, metamorphic, peritectic and anatectic minerals during crustal anatexis has been documented in many studies, especially for radiogenic isotope systems like Rb–Sr and Sm–Nd isotope systems (e.g., Barbero et al., 1995; Ayres and Harris, 1997; Tommasini and Davies, 1997; Zeng et al., 2005a, 2005b; Gao et al., 2017). Unlike stable isotopes, the radiogenic isotopes are not only controlled by element distribution between melt and mineral, but also determined by heterogeneous isotope compositions of protolith minerals that underwent incongruent melting.
Isotope disequilibrium during partial melting of metasedimentary rocks
2019, Geochimica et Cosmochimica Acta