TY - JOUR
T1 - Reduced mineral assemblages of superficial origin in west-central Jordan
AU - Vereshchagin, Oleg S.
AU - Khmelnitskaya, Maya O.
AU - Murashko, Mikhail N.
AU - Vapnik, Yevgeny
AU - Zaitsev, Anatoly N.
AU - Vlasenko, Natalia S.
AU - Shilovskikh, Vladimir V.
AU - Britvin, Sergey N.
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2024.
PY - 2024/6/1
Y1 - 2024/6/1
N2 - Mineral assemblages formed at low oxygen fugacity are commonly confined to the lithologies of extraterrestrial or deep Earth origin. The occurrences of reduced mineral phases in upper crustal rocks [formed under oxygen fugacity conditions below the iron-wüstite (IW) buffer] are rare. However, they are important for understanding the chemical drivers of natural redox processes. Here, we present detailed studies of reduced mineral assemblages, which were found in situ in superficial combustion metamorphic (CM) rocks of west-central Jordan and compare them to reduced mineral assemblages found in situ in the CM rocks of south-central Israel. The studied assemblages contain a suite of exotic phases more typical of meteorites: native iron, phosphides (schreibersite, Fe3P; allabogdanite, Fe2P; transjordanite, Ni2P; murashkoite, FeP; halamishite, Ni5P4; zuktamrurite, FeP2; polekhovskyite, MoNiP2), and sulphides (daubréelite, FeCr2S4; oldhamite, CaS; troilite, FeS), part of which (native iron, allabogdanite, halamishite, polekhovskyite, daubréelite) have not previously been discovered in the CM rocks of west-central Jordan. The mineralogical diversity of terrestrial phosphides and the occurrence of Ni- / Mo-rich phases can be explained by (1) high P, Ni, and Mo content in the sedimentary protolith, (2) transformations of primary Fe3P / Fe2P, (3) extreme disequilibrium of the processes, and (4) crystal-chemical control of Ni- / Mo- speciation.
AB - Mineral assemblages formed at low oxygen fugacity are commonly confined to the lithologies of extraterrestrial or deep Earth origin. The occurrences of reduced mineral phases in upper crustal rocks [formed under oxygen fugacity conditions below the iron-wüstite (IW) buffer] are rare. However, they are important for understanding the chemical drivers of natural redox processes. Here, we present detailed studies of reduced mineral assemblages, which were found in situ in superficial combustion metamorphic (CM) rocks of west-central Jordan and compare them to reduced mineral assemblages found in situ in the CM rocks of south-central Israel. The studied assemblages contain a suite of exotic phases more typical of meteorites: native iron, phosphides (schreibersite, Fe3P; allabogdanite, Fe2P; transjordanite, Ni2P; murashkoite, FeP; halamishite, Ni5P4; zuktamrurite, FeP2; polekhovskyite, MoNiP2), and sulphides (daubréelite, FeCr2S4; oldhamite, CaS; troilite, FeS), part of which (native iron, allabogdanite, halamishite, polekhovskyite, daubréelite) have not previously been discovered in the CM rocks of west-central Jordan. The mineralogical diversity of terrestrial phosphides and the occurrence of Ni- / Mo-rich phases can be explained by (1) high P, Ni, and Mo content in the sedimentary protolith, (2) transformations of primary Fe3P / Fe2P, (3) extreme disequilibrium of the processes, and (4) crystal-chemical control of Ni- / Mo- speciation.
KW - Dead Sea transform Fault
KW - Iron-wüstite buffer
KW - Native iron
KW - Phosphide
KW - Reduced phases
UR - http://www.scopus.com/inward/record.url?scp=85188160952&partnerID=8YFLogxK
U2 - 10.1007/s00710-024-00851-8
DO - 10.1007/s00710-024-00851-8
M3 - Article
AN - SCOPUS:85188160952
SN - 0930-0708
VL - 118
SP - 305
EP - 319
JO - Mineralogy and Petrology
JF - Mineralogy and Petrology
IS - 2
ER -