Research output: Contribution to journal › Article › peer-review
Raman Spectroscopy of High-Pressure Phases in Shocked L6 Chondrite NWA 5011. / Litasov, K. D.; Badyukov, D. D.
In: Geochemistry International, Vol. 57, No. 8, 01.08.2019, p. 912-922.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Raman Spectroscopy of High-Pressure Phases in Shocked L6 Chondrite NWA 5011
AU - Litasov, K. D.
AU - Badyukov, D. D.
N1 - Publisher Copyright: © 2019, Pleiades Publishing, Ltd.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - Abstract—The paper presents the results of studies of thick shock melt veins in the L6 chondrite NWA 5011. The veins contain a wide variety of high-pressure phases that correspond to contrast values of pressure–temperature parameters on equilibrium phase diagrams. Olivine was transformed to ringwoodite and wadsleyite, orthopyroxene to majorite, akimotoite, and bridgmanite glass, maskelynite is converted to jadeite (+SiO2) and lingunite, apatite to tuite, and chromite to the phase with the calcium ferrite (mCF-FeCr2O4) structure. The peak PT shock parameters for NWA 5011 seem to be the highest among the ones for other shocked chondrites according to the wide occurrence of lingunite and bridgmanite glass and are considerably higher than 25 GPa and 2500 K. Akimotoite crystals in a quenched matrix of the shock melt veins were found for the first time. Probably, they initially crystallized as bridgmanite, since akimotoite is not a liquidus phase in the related systems. Plagioclase–chromite aggregates have been established, which characterize the late stages of the shock process and are formed during successive crystallization from isolated pockets of the impact melt.
AB - Abstract—The paper presents the results of studies of thick shock melt veins in the L6 chondrite NWA 5011. The veins contain a wide variety of high-pressure phases that correspond to contrast values of pressure–temperature parameters on equilibrium phase diagrams. Olivine was transformed to ringwoodite and wadsleyite, orthopyroxene to majorite, akimotoite, and bridgmanite glass, maskelynite is converted to jadeite (+SiO2) and lingunite, apatite to tuite, and chromite to the phase with the calcium ferrite (mCF-FeCr2O4) structure. The peak PT shock parameters for NWA 5011 seem to be the highest among the ones for other shocked chondrites according to the wide occurrence of lingunite and bridgmanite glass and are considerably higher than 25 GPa and 2500 K. Akimotoite crystals in a quenched matrix of the shock melt veins were found for the first time. Probably, they initially crystallized as bridgmanite, since akimotoite is not a liquidus phase in the related systems. Plagioclase–chromite aggregates have been established, which characterize the late stages of the shock process and are formed during successive crystallization from isolated pockets of the impact melt.
KW - akimotoite
KW - bridgmanite
KW - chondrite
KW - majorite
KW - meteorite
KW - ringwoodite
KW - shock metamorphism
KW - SYSTEM
KW - MINERALS
KW - STABILITY
KW - ASSEMBLAGES
KW - STISHOVITE
KW - PERIDOTITE
KW - DISCOVERY
KW - CONSTRAINTS
KW - 22 GPA
KW - TRANSITIONS
UR - http://www.scopus.com/inward/record.url?scp=85070237523&partnerID=8YFLogxK
U2 - 10.1134/S001670291908007X
DO - 10.1134/S001670291908007X
M3 - Article
AN - SCOPUS:85070237523
VL - 57
SP - 912
EP - 922
JO - Geochemistry International
JF - Geochemistry International
SN - 0016-7029
IS - 8
ER -
ID: 21254969