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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We have determined D Eu  between augite and melt in samples that crystallized from a highly spiked martian basalt composition at four f O₂  conditions. D Eu  augite/melt shows a steady increase with f O₂  from 0.086 at IW -1  to 0.274 at IW+3.5. This increase is because Eu3+ is more compatible than Eu 2+  in the pyroxene structure; thus increasing f O₂  leads to greater Eu 3+ /Eu 2+  in the melt and more Eu (total) can partition into the crystallizing pyroxene. This interpretation is supported by direct determinations of Eu valence state by XANES, which show a steady increase of Eu 3+ /Eu 2+  with increasing f O₂  in both pyroxene (0.38 to 14.6) and glass (0.20 to 12.6) in the samples. Also, pyroxene Eu 3+ /Eu 2+  is higher than that of adjacent glass in all the samples, which verifies that Eu 3+  is more compatible than Eu 2+  in the pyroxene structure. Combining partitioning data with XANES data allows for the calculation of specific valence state D-values for augite/melt where D Eu3+  = 0.28 and D Eu2+  = 0.07.

american mineralogist

Partitioning of Eu between augite and a highly spiked martian basalt composition as a function of oxygen fugacity (IW-1 to QFM): Determination of Eu 2+ /Eu 3+  ratios by XANES