English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The use of pseudosections has become widespread in recent years, but few studies tested them. This work aims at comparing pseudosections calculated for mafic compositions with experimental data, and with thermobarometric data obtained for correlate metapelites. Pseudosections were calculated for six mafic bulk-rock compositions, in the range 425-700 °C and 2-8 kbar. The resulting diagrams can be divided into two groups: one in which a classic sequence of mineral assemblages is predicted and another where quartz is unstable and diopside is stable throughout. The pseudosection results compare well to the independent data in three of the six studied cases. The main inconsistencies found in the pseudosections are underestimation of the stability field of garnet and overestimation of the stability field of diopside, which is at odds not only with data specific to the rocks studied here, but with the literature on metamafic rocks in general. In the case of garnet, the most likely cause of discrepancy is the absence of Mn in the activity-composition models available. On the other hand, the issue with diopside is much harder to evaluate, as it may be related to any of the activity-composition models, or to relationships between two or more of them. Nonetheless, we can affirm that the overestimation of the diopside stability field occurs in rocks calculated to be unsaturated in SiO2, and that it is linked to a minor overestimation of the stability field of hornblende.

The metamorphism of mafic rocks: studies on reaction textures, local equilibrium and thermodynamic modelling