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In situ observation and determination of liquid immiscibility in the Fe‐O‐S melt at 3 GPa using a synchrotron X‐ray radiographic technique
Author(s) -
Tsuno Kyusei,
Terasaki Hidenori,
Ohtani Eiji,
Suzuki Akio,
Asahara Yuki,
Nishida Keisuke,
Sakamaki Tatsuya,
Funakoshi Kenichi,
Kikegawa Takumi
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030750
Subject(s) - synchrotron , quenching (fluorescence) , in situ , materials science , homogeneous , analytical chemistry (journal) , phase (matter) , thermodynamics , mineralogy , optics , geology , chemistry , fluorescence , physics , chromatography , organic chemistry
We have performed in situ experiments on liquid immiscibility in Fe‐O‐S melts at 3 GPa and up to 2203 K using a synchrotron X‐ray radiographic technique. The difference between immiscible melts and a miscible melt can be clearly observed in radiographs. The immiscibility gap of the Fe‐O‐S melt shrinks with increasing temperature at 3 GPa. Two separated phases appeared from a miscible melt during quenching. Without in situ observations, the two phases observed in quench textures would be interpreted as either quench products from primary immiscible melts at high temperature, or those exsolved from a homogeneous melt to immiscible melts passing through the stability field of immiscible melts during quenching. In situ measurements are required in order to determine the immiscibility gap of the liquid Fe with light element(s). Our results have important implications for the formation and chemical composition of the cores of Earth and Mars.