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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00117261" target="_blank" >RIV/00216224:14310/20:00117261 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1111/1755-6724.14326" target="_blank" >https://doi.org/10.1111/1755-6724.14326</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/1755-6724.14326" target="_blank" >10.1111/1755-6724.14326</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 &amp; 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 &amp; 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Geologica Sinica - English Edition

ISSN

1000-9515

e-ISSN

1755-6724

Svazek periodika

94

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

20

Strana od-do

1451-1470

Kód UT WoS článku

000585902600010

EID výsledku v databázi Scopus

2-s2.0-85091723402