Volcanic redbed-type copper mineralization in the Lower Cretaceous volcano-sedimentary sequence of the Keshtmahaki deposit, southern Sanandaj-Sirjan Zone, Iran

Konari, Mina Boveiri; Rastad, Ebrahim; Kojima, Shoji; Omran, N Rashidnejad

doi:10.1127/0077-7757/2013/0236

Cited by 7 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Медистые сланцы Оройка по концентрации полезных элементов-примесей (табл. 2), исключая Rh, близки к медистым песчаникам и сланцами Оренбургского Предуралья, Ирана [2,15,21,25,27,32] и отличаются низкими содержаниям Co и Ni от медистых песчаников Африканского пояса [20], а Zn и Pb -от Купершифера [15].…”

Section: обсуждение результатовunclassified

Copper Shales of the Prikolymsky Terrane (North-East of Russia): Mineralogical and Geochemical Features and Ore-Forming Conditions

Savva,

Volkov,

Galyamov

et al. 2023

View full text Add to dashboard Cite

Copper mineralization in the Magadan region (North-East of Russia) has been established in quartz-chloritoid and chlorite shales of the middle and upper Riphean of the Prikolymsky terrane. Compared to the upper crust, copper shales of the Oroek deposit are noticeably enriched in a narrow range of trace elements: Cu, Ag, Au, Rh, and Se, with enrichment factors ranging from 10-fold (Se, Rh) to 100-fold (Ag, Au) and even 1000-fold (Cu) suggesting, apparently, their synchronous involvement in ore formation. In addition, the studied samples are slightly enriched in Cd, Li, Co, Zn, V, U, Sc, Y, and REE. Copper shales show relatively flat rare earth element (REE) patterns similar to the chondrite-normalized pattern having no distinct positive or negative Eu anomalies and dominated by light lanthanides. The Ce/Ce* and Eu/Eu* values indicate that ore formation proceeded under oxidizing conditions. The obtained geochemical data show that the Riphean host rocks could serve as a source of trace elements and REE ore-forming fluids. In the ores, covellin and chalcocite are the main copper minerals; less common are roxbyite, idaite, nukundamite, spioncopite, chalcopyrite, silver-bearing (Ag about 1 wt. %) bornite and yarrovite, as well as native gold. Fluid inclusions in quartz suggest that copper mineralization was formed at temperatures of 212–190 °C and a pressure of 1 kbar, from hydrothermal solutions of medium salinity (from 13.8 to 12.4 wt. % eq. NaCl) and high density (0.95–0.98 g/cm3) saturated with chlorides of Ca, Mg, and K. The copper shales of the Prikolymsky terrane differ from sedimentary copper and copper shales of the African Belt by low Co and Ni contents and from the Kupfershifer by low concentrations of Pb and Zn. The obtained results can be used for prognosticating new deposits.

show abstract

Section: обсуждение результатовunclassified

Copper Shales of the Prikolymsky Terrane (North-East of Russia): Mineralogical and Geochemical Features and Ore-Forming Conditions

Savva,

Volkov,

Galyamov

et al. 2023

View full text Add to dashboard Cite

show abstract

Zangalou Manto‐type deposit in the Sabzevar zone, northeast Iran: Evidence of mineralogy, geochemistry,U–Pbdating, fluid inclusion, and stable isotopes

et al. 2022

View full text Add to dashboard Cite

The Zangalou Cu deposit lies in the Sabzevar volcanic-plutonic zone, northeastern Iran. The deposit is hosted by the middle Eocene volcanic-sedimentary sequences and it has been affected by propylitic, carbonate, sericitic, and minor argillic alterations. The volcanics have features typical of calc-alkaline and metaluminous magmas and are plotted in the continental volcanic arc region. Zircon U-Pb dating of the andesite porphyry yield ages of 41.2 and 38.4 Ma (Bartonian). Ore mineralization occurs as stratabound with open-space filling, dissemination, veinlet, and replacement textures in mineralized conglomerate, andesite porphyry, and trachyandesite host rocks. Cu content in Zangalou deposit vary from 1,234 g/t to 6.24% which mostly occurred as chalcocite mineral. Fluid inclusion data of mineralization-related calcites indicate medium salinities (12.8-16.6 wt.% NaCl equivalents) and a wide range of temperatures (154-295 C) and show evidence of fluid cooling trend during the ore formation. The δ 13 C (between 19.3 and À2.8‰) and δ 18 O SMOW (between 24.8 and 25.34‰) values of ore-related calcites suggests a contribution of sedimentary organic matter and marine carbonates as the source of carbon in the ore-forming fluid. High positive δ 34 S values (27.8-33.47‰) suggest that the source of sulphur is related to sedimentary country rocks. Mineralization is lithologically and structurally controlled and it is epigenetic. According to geological, petrological, alteration, mineralization textures and geometry of deposit, fluid inclusion, and isotopic studies, the Zangalou deposit is similar to manto-type deposits.

show abstract

Geology, geochemistry, and genesis of Gheshlagh Cu deposit, Tarom-Hashtjin zone, Zanjan, northwestern Iran

et al. 2021

View full text Add to dashboard Cite

Volcanic redbed-type copper mineralization in the Lower Cretaceous volcano-sedimentary sequence of the Keshtmahaki deposit, southern Sanandaj-Sirjan Zone, Iran

Cited by 7 publications

References 0 publications

Copper Shales of the Prikolymsky Terrane (North-East of Russia): Mineralogical and Geochemical Features and Ore-Forming Conditions

Copper Shales of the Prikolymsky Terrane (North-East of Russia): Mineralogical and Geochemical Features and Ore-Forming Conditions

Zangalou Manto‐type deposit in the Sabzevar zone, northeast Iran: Evidence of mineralogy, geochemistry,U–Pbdating, fluid inclusion, and stable isotopes

Geology, geochemistry, and genesis of Gheshlagh Cu deposit, Tarom-Hashtjin zone, Zanjan, northwestern Iran

Contact Info

Product

Resources

About