Ore-forming mechanism and its relationship with deformational
and metamorphic episodes at Haimur gold mine, Nubian Shield,
Egypt

J 2021

Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt

ABDELMONSEF ABDELKHALEEK BOKHTIA, Mohamed a Amr ABDELNASSER

Základní údaje

Originální název

Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt

Autoři

ABDELMONSEF ABDELKHALEEK BOKHTIA, Mohamed a Amr ABDELNASSER

Vydání

Geological Magazine, Cambridge University Press, 2021, 0016-7568

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10505 Geology

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.656

Kód RIV

RIV/00216224:14310/21:00124577

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1017/S0016756820000655

UT WoS

000617280900009

EID Scopus

2-s2.0-85088537543

Klíčová slova anglicky

arsenopyrite thermometry; fluid inclusions; Najd shearing; metamorphism; Haimur gold deposit; Egypt

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 11. 5. 2022 15:31, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

The Haimur area represents the central part of the Wadi Allaqi region in the southern block of the Egyptian Eastern Desert near Nasser Lake and the Nile valley. It is made up of ophiolitic assemblage comprising serpentinite and talc carbonate, listwenite, metagabbro/amphibolite and metabasalt and island arc assemblages. The orogenic gold deposits in the Haimur area occur in the form of smoky/white sulphide-bearing quartz / quartz-carbonate veins or lenses cutting through the listwenite zone-related rocks. The NE-trending auriferous veins were formed due to an extensional to transtensional shearing related to NW Najd shear tectonics. Gold was observed in association with late-pyrite and chalcopyrite paragenetically formed in the gold phase (second phase), while the first phase is the sulphide phase including early-pyrite and arsenopyrite. Arsenopyrite was formed during early metamorphic recrystallization at a high-temperature range between 405 and 512 °C. However, gold was formed at lower temperature through retrograde metamorphism. Three types of fluid inclusions have been recognized: aqueous (type-I), mixed aqueous–carbonic (type-II) and hydrocarbonic (type-III). The P–T conditions of trapping were obtained from the isochore lines of intersection between T = 300–320 °C and pressure range of 60–180 MPa. The Haimur gold deposit was supposed to be derived from metamorphic fluids created by dehydration and decarbonation of ophiolitic mélange assemblages and volcano-sedimentary rocks, in which the gold was transported as Au(HS)2– complexes and precipitated in reduced environment. The strong linkage between the deformation and metamorphism triggered gold deposition in structurally favourable sites related to the Najd fault system.

Citovat

ABDELMONSEF ABDELKHALEEK BOKHTIA, Mohamed a Amr ABDELNASSER. Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt. Geological Magazine. Cambridge University Press, 2021, roč. 158, č. 3, s. 518-536. ISSN 0016-7568. Dostupné z: https://doi.org/10.1017/S0016756820000655.

@article{1852572,
   author = {AbdelMonsef Abdelkhaleek Bokhtia, Mohamed and Abdelnasser, Amr},
   article_number = {3},
   doi = {https://doi.org/10.1017/S0016756820000655},
   keywords = {arsenopyrite thermometry; fluid inclusions; Najd shearing; metamorphism; Haimur gold deposit; Egypt},
   language = {eng},
   issn = {0016-7568},
   journal = {Geological Magazine},
   title = {Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt},
   url = {https://www.cambridge.org/core/journals/geological-magazine/article/oreforming-mechanism-and-its-relationship-with-deformational-and-metamorphic-episodes-at-haimur-gold-mine-nubian-shield-egypt/4B951A9EC49F309AAE5CAB033D4C7472},
   volume = {158},
   year = {2021}
}

TY  - JOUR
ID  - 1852572
AU  - AbdelMonsef Abdelkhaleek Bokhtia, Mohamed - Abdelnasser, Amr
PY  - 2021
TI  - Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt
JF  - Geological Magazine
VL  - 158
IS  - 3
SP  - 518-536
EP  - 518-536
PB  - Cambridge University Press
SN  - 00167568
KW  - arsenopyrite thermometry
KW  - fluid inclusions
KW  - Najd shearing
KW  - metamorphism
KW  - Haimur gold deposit
KW  - Egypt
UR  - https://www.cambridge.org/core/journals/geological-magazine/article/oreforming-mechanism-and-its-relationship-with-deformational-and-metamorphic-episodes-at-haimur-gold-mine-nubian-shield-egypt/4B951A9EC49F309AAE5CAB033D4C7472
N2  - The Haimur area represents the central part of the Wadi Allaqi region in the southern block of the Egyptian Eastern Desert near Nasser Lake and the Nile valley. It is made up of ophiolitic assemblage comprising serpentinite and talc carbonate, listwenite, metagabbro/amphibolite and metabasalt and island arc assemblages. The orogenic gold deposits in the Haimur area occur in the form of smoky/white sulphide-bearing quartz / quartz-carbonate veins or lenses cutting through the listwenite zone-related rocks. The NE-trending auriferous veins were formed due to an extensional to transtensional shearing related to NW Najd shear tectonics. Gold was observed in association with late-pyrite and chalcopyrite paragenetically formed in the gold phase (second phase), while the first phase is the sulphide phase including early-pyrite and arsenopyrite. Arsenopyrite was formed during early metamorphic recrystallization at a high-temperature range between 405 and 512 °C. However, gold was formed at lower temperature through retrograde metamorphism. Three types of fluid inclusions have been recognized: aqueous (type-I), mixed aqueous–carbonic (type-II) and hydrocarbonic (type-III). The P–T conditions of trapping were obtained from the isochore lines of intersection between T = 300–320 °C and pressure range of 60–180 MPa. The Haimur gold deposit was supposed to be derived from metamorphic fluids created by dehydration and decarbonation of ophiolitic mélange assemblages and volcano-sedimentary rocks, in which the gold was transported as Au(HS)2– complexes and precipitated in reduced environment. The strong linkage between the deformation and metamorphism triggered gold deposition in structurally favourable sites related to the Najd fault system.
ER  -

ABDELMONSEF ABDELKHALEEK BOKHTIA, Mohamed a Amr ABDELNASSER. Ore-forming mechanism and its relationship with deformational and metamorphic episodes at Haimur gold mine, Nubian Shield, Egypt. \textit{Geological Magazine}. Cambridge University Press, 2021, roč.~158, č.~3, s.~518-536. ISSN~0016-7568. Dostupné z: https://doi.org/10.1017/S0016756820000655.

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