Ore Controls and Metallogenesis of Au-Ag Deposits at Atalla
Mine, Central Eastern Desert of Egypt

J 2020

Ore Controls and Metallogenesis of Au-Ag Deposits at Atalla Mine, Central Eastern Desert of Egypt

MOHAMED, Mohamed

Základní údaje

Originální název

Ore Controls and Metallogenesis of Au-Ag Deposits at Atalla Mine, Central Eastern Desert of Egypt

Autoři

MOHAMED, Mohamed

Vydání

Acta Geologica Sinica - English Edition, Hoboken, Wiley, 2020, 1000-9515

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: 1.886

Kód RIV

RIV/00216224:14310/20:00117261

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1111/1755-6724.14326

UT WoS

000585902600010

EID Scopus

2-s2.0-85091723402

Klíčová slova anglicky

Gold- silver; arsenopyrite geothermometry; fluid inclusions; orogenic deposits; Atalla Shear Zone (ASZ)

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 11. 1. 2021 16:18, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Gold-silver deposits in the Atalla area occur as hydrothermal quartz veins in NE-SW pre-existing fractures within the Atalla granitic pluton. The orientation of such quartz veins has been attributed to extensional behavior related to the Atalla Shear Zone (ASZ). The Atalla area is covered by a variety of lithologies that are (from oldest to youngest): metasedimentary rocks, metavolcanic rocks, ophiolite assemblage (serpentinites/talc-carbonates), Atalla granite and Dokhan volcanic rocks. Microscopically, Atalla granite ranges in composition from granodiorite to monzogranite. Whole-rock geochemistry constrains the calc-alkaine affinity of the Atalla granite that was intruded within an orogenic (syncollision) tectonic regime. The ore minerals are represented by gold/silver (electrum), pyrite (Py-1 & Py-2), arsenopyrite, pyrrhotite, sphalerite, chalcopyrite, galena, covellite and goethite. The temperature of ore formation ranges from 240 to 285 degrees C and the estimated fluid pressure is in the range of 20-100 MPa. Based on the geological setting, ore textures and fluid characteristics; the Atalla Au-Ag deposits are considered to be orogenic in nature, formed from a continental collision (similar to 653-590 Ma), synchronous with the emplacement of calc-alkaline magmatism during the evolutionary history of the Arabian Nubian Shield (ANS). The initial ore-forming fluid was primarily derived from a metamorphic source related to ophiolitic-serpentinite rocks under deep regional conditions of greenschist-amphibolite facies, where the Atalla granitic eruption provided the required temperature conditions for the metamorphic process to take place. Under such conditions, the transportation of ore metals as bisulfide complexes is favoured. The deposition of ore minerals was triggered by fluid-wallrock interaction through fracture pathways in conjunction with a temperature-pressure drop that is likely to have been related to uplift into the crustal levels.

Citovat

MOHAMED, Mohamed. Ore Controls and Metallogenesis of Au-Ag Deposits at Atalla Mine, Central Eastern Desert of Egypt. Acta Geologica Sinica - English Edition. Hoboken: Wiley, 2020, roč. 94, č. 5, s. 1451-1470. ISSN 1000-9515. Dostupné z: https://doi.org/10.1111/1755-6724.14326.

@article{1705656,
   author = {Mohamed, Mohamed},
   article_location = {Hoboken},
   article_number = {5},
   doi = {https://doi.org/10.1111/1755-6724.14326},
   keywords = {Gold- silver; arsenopyrite geothermometry; fluid inclusions; orogenic deposits; Atalla Shear Zone (ASZ)},
   language = {eng},
   issn = {1000-9515},
   journal = {Acta Geologica Sinica - English Edition},
   title = {Ore Controls and Metallogenesis of Au-Ag Deposits at Atalla Mine, Central Eastern Desert of Egypt},
   url = {https://doi.org/10.1111/1755-6724.14326},
   volume = {94},
   year = {2020}
}

TY  - JOUR
ID  - 1705656
AU  - Mohamed, Mohamed
PY  - 2020
TI  - Ore Controls and Metallogenesis of Au-Ag Deposits at Atalla Mine, Central Eastern Desert of Egypt
JF  - Acta Geologica Sinica - English Edition
VL  - 94
IS  - 5
SP  - 1451-1470
EP  - 1451-1470
PB  - Wiley
SN  - 10009515
KW  - Gold- silver
KW  - arsenopyrite geothermometry
KW  - fluid inclusions
KW  - orogenic deposits
KW  - Atalla Shear Zone (ASZ)
UR  - https://doi.org/10.1111/1755-6724.14326
L2  - https://doi.org/10.1111/1755-6724.14326
N2  - Gold-silver deposits in the Atalla area occur as hydrothermal quartz veins in NE-SW pre-existing fractures within the Atalla granitic pluton. The orientation of such quartz veins has been attributed to extensional behavior related to the Atalla Shear Zone (ASZ). The Atalla area is covered by a variety of lithologies that are (from oldest to youngest): metasedimentary rocks, metavolcanic rocks, ophiolite assemblage (serpentinites/talc-carbonates), Atalla granite and Dokhan volcanic rocks. Microscopically, Atalla granite ranges in composition from granodiorite to monzogranite. Whole-rock geochemistry constrains the calc-alkaine affinity of the Atalla granite that was intruded within an orogenic (syncollision) tectonic regime. The ore minerals are represented by gold/silver (electrum), pyrite (Py-1 & Py-2), arsenopyrite, pyrrhotite, sphalerite, chalcopyrite, galena, covellite and goethite. The temperature of ore formation ranges from 240 to 285 degrees C and the estimated fluid pressure is in the range of 20-100 MPa. Based on the geological setting, ore textures and fluid characteristics; the Atalla Au-Ag deposits are considered to be orogenic in nature, formed from a continental collision (similar to 653-590 Ma), synchronous with the emplacement of calc-alkaline magmatism during the evolutionary history of the Arabian Nubian Shield (ANS). The initial ore-forming fluid was primarily derived from a metamorphic source related to ophiolitic-serpentinite rocks under deep regional conditions of greenschist-amphibolite facies, where the Atalla granitic eruption provided the required temperature conditions for the metamorphic process to take place. Under such conditions, the transportation of ore metals as bisulfide complexes is favoured. The deposition of ore minerals was triggered by fluid-wallrock interaction through fracture pathways in conjunction with a temperature-pressure drop that is likely to have been related to uplift into the crustal levels.
ER  -

MOHAMED, Mohamed. Ore Controls and Metallogenesis of Au-Ag Deposits at Atalla Mine, Central Eastern Desert of Egypt. \textit{Acta Geologica Sinica - English Edition}. Hoboken: Wiley, 2020, roč.~94, č.~5, s.~1451-1470. ISSN~1000-9515. Dostupné z: https://doi.org/10.1111/1755-6724.14326.

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