Index Minerals of the Hydrothermal Arsenide Process of the Formation of Cobalt Deposits of the Bou Offro-El Graara Ore Belt in the Anti-Atlas Province, Morocco

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Index Minerals of the Hydrothermal Arsenide Process of the Formation of Cobalt Deposits of the Bou Offro-El Graara Ore Belt in the Anti-Atlas Province, Morocco. / Lebedev, V. I.; Kalinin, Yu. A.

In: Geology of Ore Deposits, Vol. 62, No. 6, 11.2020, p. 457-479.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{384e4cff973c4a38b81944866dd7c6b8,

title = "Index Minerals of the Hydrothermal Arsenide Process of the Formation of Cobalt Deposits of the Bou Offro-El Graara Ore Belt in the Anti-Atlas Province, Morocco",

abstract = "The distribution of index minerals of the hydrothermal arsenide process of the formation of Ni‒Co–As (±U–Ag), Co–S–As (±Au–W), and Cu–Co–As (±Sb–Ag) quartz–carbonate veins of deposits of the Bou Offro–El Graara ore belt (Morocco) are discussed. The Co arsenide objects of the Bou Azzer ore cluster with typical low-temperature Ni–Co–As (U–Ag) deposits of the five-element hydrothermal type are of special interest: El Jir, Mechoui, Tarouni, Central and East Bou Azzer, Aghbar, Tamdrost, etc. The ores of most of the studied deposits are strongly enriched in Co relative to Ni (Co/Ni ratio = 10/1), have high grades of Au (up to 100 g/t) and Mo (up to 0.1%) with relatively low Ag, Ni, and U contents. Based on the analysis of the interrelations of ore and gangue minerals, the sequence of the formation of mineral assemblages is identified and their mineralogical–geochemical zonation is studied. The range of the most favorable physicochemical parameters of ore deposition is determined from the fluid inclusions in the gangue minerals. The indicative role of mineralogical–geochemical features of ore assemblages is shown for the forecast and survey of blind ore bodies.",

keywords = "Morocco, Anti-Atlas, Co arsenide deposits, index minerals, sulfides, thermobarogeochemistry, SILVER, AG, SB",

author = "Lebedev, {V. I.} and Kalinin, {Yu. A.}",

note = "Funding Information: This study was supported by a state contract of the IGM SB RAS. Publisher Copyright: {\textcopyright} 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

year = "2020",

month = nov,

doi = "10.1134/S1075701520060033",

language = "English",

volume = "62",

pages = "457--479",

journal = "Geology of Ore Deposits",

issn = "1075-7015",

publisher = "Maik Nauka-Interperiodica Publishing",

number = "6",

}

RIS

TY - JOUR

T1 - Index Minerals of the Hydrothermal Arsenide Process of the Formation of Cobalt Deposits of the Bou Offro-El Graara Ore Belt in the Anti-Atlas Province, Morocco

AU - Lebedev, V. I.

AU - Kalinin, Yu. A.

N1 - Funding Information: This study was supported by a state contract of the IGM SB RAS. Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2020/11

Y1 - 2020/11

N2 - The distribution of index minerals of the hydrothermal arsenide process of the formation of Ni‒Co–As (±U–Ag), Co–S–As (±Au–W), and Cu–Co–As (±Sb–Ag) quartz–carbonate veins of deposits of the Bou Offro–El Graara ore belt (Morocco) are discussed. The Co arsenide objects of the Bou Azzer ore cluster with typical low-temperature Ni–Co–As (U–Ag) deposits of the five-element hydrothermal type are of special interest: El Jir, Mechoui, Tarouni, Central and East Bou Azzer, Aghbar, Tamdrost, etc. The ores of most of the studied deposits are strongly enriched in Co relative to Ni (Co/Ni ratio = 10/1), have high grades of Au (up to 100 g/t) and Mo (up to 0.1%) with relatively low Ag, Ni, and U contents. Based on the analysis of the interrelations of ore and gangue minerals, the sequence of the formation of mineral assemblages is identified and their mineralogical–geochemical zonation is studied. The range of the most favorable physicochemical parameters of ore deposition is determined from the fluid inclusions in the gangue minerals. The indicative role of mineralogical–geochemical features of ore assemblages is shown for the forecast and survey of blind ore bodies.

AB - The distribution of index minerals of the hydrothermal arsenide process of the formation of Ni‒Co–As (±U–Ag), Co–S–As (±Au–W), and Cu–Co–As (±Sb–Ag) quartz–carbonate veins of deposits of the Bou Offro–El Graara ore belt (Morocco) are discussed. The Co arsenide objects of the Bou Azzer ore cluster with typical low-temperature Ni–Co–As (U–Ag) deposits of the five-element hydrothermal type are of special interest: El Jir, Mechoui, Tarouni, Central and East Bou Azzer, Aghbar, Tamdrost, etc. The ores of most of the studied deposits are strongly enriched in Co relative to Ni (Co/Ni ratio = 10/1), have high grades of Au (up to 100 g/t) and Mo (up to 0.1%) with relatively low Ag, Ni, and U contents. Based on the analysis of the interrelations of ore and gangue minerals, the sequence of the formation of mineral assemblages is identified and their mineralogical–geochemical zonation is studied. The range of the most favorable physicochemical parameters of ore deposition is determined from the fluid inclusions in the gangue minerals. The indicative role of mineralogical–geochemical features of ore assemblages is shown for the forecast and survey of blind ore bodies.

KW - Morocco

KW - Anti-Atlas

KW - Co arsenide deposits

KW - index minerals

KW - sulfides

KW - thermobarogeochemistry

KW - SILVER

KW - AG

KW - SB

UR - http://www.scopus.com/inward/record.url?scp=85100210497&partnerID=8YFLogxK

U2 - 10.1134/S1075701520060033

DO - 10.1134/S1075701520060033

M3 - Article

VL - 62

SP - 457

EP - 479

JO - Geology of Ore Deposits

JF - Geology of Ore Deposits

SN - 1075-7015

IS - 6

ER -

ID: 27767603