Research output: Contribution to journal › Article › peer-review
Specific multiphase assemblages of carbonatitic and al-rich silicic diamond-forming fluids/melts : TEM observation of microinclusions in cuboid diamonds from the placers of Northeastern Siberian craton. / Logvinova, Alla; Zedgenizov, Dmitry; Wirth, Richard.
In: Minerals, Vol. 9, No. 1, 50, 01.01.2019.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Specific multiphase assemblages of carbonatitic and al-rich silicic diamond-forming fluids/melts
T2 - TEM observation of microinclusions in cuboid diamonds from the placers of Northeastern Siberian craton
AU - Logvinova, Alla
AU - Zedgenizov, Dmitry
AU - Wirth, Richard
PY - 2019/1/1
Y1 - 2019/1/1
N2 - The microinclusions in cuboid diamonds from Ebelyakh River deposits (northeastern Siberian craton) have been investigated by FIB/TEM techniques. It was found that these microinclusions have multiphase associations, containing silicates, oxides, carbonates, halides, sulfides, graphite, and fluid phases. The bulk chemical composition of the microinclusions indicates two contrasting growth media: Mg-rich carbonatitic and Al-rich silicic. Each media has their own specific set of daughter phases. Carbonatitic microinclusions are characterized by the presence of dolomite, phlogopite, apatite, Mg, Fe-oxide, KCl, rutile, magnetite, Fe-sulfides, and hydrous fluid phases. Silicic microinclusions are composed mainly of free SiO 2 phase (quartz), high-Si mica (phengite), Al-silicate (paragonite), F-apatite, Ca-carbonates enriched with Sr and Ba, Fe-sulfides, and hydrous fluid phases. These associations resulted from the cooling of diamond-forming carbonatitic and silicic fluids/melts preserved in microinclusions in cuboid diamonds during their ascent to the surface. The observed compositional variations indicate different origins and evolutions of these fluids/melts.
AB - The microinclusions in cuboid diamonds from Ebelyakh River deposits (northeastern Siberian craton) have been investigated by FIB/TEM techniques. It was found that these microinclusions have multiphase associations, containing silicates, oxides, carbonates, halides, sulfides, graphite, and fluid phases. The bulk chemical composition of the microinclusions indicates two contrasting growth media: Mg-rich carbonatitic and Al-rich silicic. Each media has their own specific set of daughter phases. Carbonatitic microinclusions are characterized by the presence of dolomite, phlogopite, apatite, Mg, Fe-oxide, KCl, rutile, magnetite, Fe-sulfides, and hydrous fluid phases. Silicic microinclusions are composed mainly of free SiO 2 phase (quartz), high-Si mica (phengite), Al-silicate (paragonite), F-apatite, Ca-carbonates enriched with Sr and Ba, Fe-sulfides, and hydrous fluid phases. These associations resulted from the cooling of diamond-forming carbonatitic and silicic fluids/melts preserved in microinclusions in cuboid diamonds during their ascent to the surface. The observed compositional variations indicate different origins and evolutions of these fluids/melts.
KW - Cuboid diamonds
KW - Diamond-forming fluids/melts
KW - Mantle
KW - Microinclusions
KW - CRYSTALLIZATION
KW - HIGH-PRESSURE
KW - microinclusions
KW - ION-BEAM FIB
KW - MANTLE FLUIDS
KW - cuboid diamonds
KW - FLUID INCLUSIONS
KW - MINERAL INCLUSIONS
KW - TRACE-ELEMENTS
KW - PHASE
KW - EVOLUTION
KW - mantle
KW - FIBROUS DIAMONDS
KW - diamond-forming fluids/melts
UR - http://www.scopus.com/inward/record.url?scp=85061740132&partnerID=8YFLogxK
U2 - 10.3390/min9010050
DO - 10.3390/min9010050
M3 - Article
AN - SCOPUS:85061740132
VL - 9
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 1
M1 - 50
ER -
ID: 18560921