Journal Article10.1007/S001260050158
From sandstone- to carbonate-hosted stratabound deposits: an isotope study of galena in the Upper-Moulouya District (Morocco)
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TL;DR: In this paper, lead and sulfur isotope studies indicate that the Aouli vein-type and Zeida sandstone-hosted stratabound mineralisations are formed by a mixing of two fluids, one formed by the leaching of the Aoui granite massif, and the other by leaching the Saharian basement.
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Abstract: The Upper Moulouya district displays three main types of lead ores in the Hercynian domain: (1) Aouli vein-type deposits hosted in the Hercynian basement, (2) Zeida Triassic sandstone-hosted, and (3) Mibladen carbonate-hosted stratabound and karstic mineralisations in the Mesozoic cover. Lead and sulfur isotope studies indicate that the Aouli vein-type and Zeida sandstone-hosted stratabound mineralisations are formed by a mixing of two fluids, one formed by the leaching of the Aouli granite massif, and the other by leaching of the Saharian basement. These deposits may correspond to the same Triassic metallogenic event, focused along fault systems or within permeable sandstone. Deep fluids were mobilised during the early extensional movements associated with the opening of the Atlas rifting basin. The Mississippi Valley type Mibladen mineralisation is related to a distinct metallogenic event superimposed on the earlier one, and represents a remobilization of earlier concentrations, or a more recent leaching of the same sources, but with a more pronounced contribution of the local organic matter. The Upper Moulouya area demonstrates the close relationship between vein type and sandstone-hosted lead-zinc mineralisations, and their major differences with Mississippi Valley type deposits.
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Citations
Mineralogy and chemical forms of lead and zinc in abandoned mine wastes and soils: An example from Morocco
TL;DR: In this paper, chemical extractions coupled with quantitative X-ray powder diffraction were used to define the chemical and mineralogical forms of Pb and Zn in abandoned wastes and soils from the Upper Moulouya mining district (Morocco).
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Impact of Past Mining Activity on the Quality of Water and Soil in the High Moulouya Valley (Morocco)
TL;DR: In this article, physical and chemical properties and the total content of potentially toxic metals (PTMs) in waters and soils were studied from the High Moulouya Valley (Morocco) in order to assess the impact of the past mining activity on their quality and to lay the foundations of a potential reclamation of the area.
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Pangea rifting and onward pre-Central Atlantic opening as the main ore-forming processes for the genesis of the Aouli REE-rich fluorite-barite vein system, Upper Moulouya District, Morocco
Daoud Margoum,Mohammed Bouabdellah,Andreas Klügel,David Banks,Francesca Castorina,Michel Cuney,Michel Jébrak,Gülcan Bozkaya +7 more
TL;DR: The Aouli fluorite-barite-sulphides vein system in the Upper Moulouya District of Central Morocco is hosted in a folded and low to medium grade sedimentary and volcanic rocks, unconformably overlaid by Permo-Triassic to Cretaceous red beds and limestones as mentioned in this paper.
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Genesis of the Assif El Mal Zn–Pb (Cu, Ag) vein deposit. An extension-related Mesozoic vein system in the High Atlas of Morocco. Structural, mineralogical, and geochemical evidence
TL;DR: The Assif El Mal Zn-Pb (Cu-Ag) vein system, located in the northern flank of the High Atlas of Marrakech (Morocco), is hosted in a Cambro-Ordovician volcaniclastic and metasedimentary sequence composed of graywacke, siltstone, pelite, and shale interlayered with minor tuff and mudstone as mentioned in this paper.
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Isotopic composition of lead in moss and soil of the European Arctic
TL;DR: In this article, the Pb isotopic signatures of moss and O horizon overlap values recorded in atmospheric lead all over central and southern Europe, more than 2000 km south of the study area.
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References
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TL;DR: Sandstone-hosted lead-zinc impregnation deposits in Scandinavia occur in Vendian to Cambrian and locally, Ordovician sandstones that rest unconformably on the deeply eroded Baltic Shield as discussed by the authors.
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Basinal brines and groundwaters as possible metal carriers in the formation of sandstone-hosted lead-zinc deposits
TL;DR: In this paper, features of the two best-documented worldclass sandstone-hosted Pb-Zn deposits (Laisvall, Sweden; Yava, Nova Scotia, Canada) and a few similar but smaller deposits (SE Missouri, Quebec Appalachians) are compared with the purpose of contributing to the debate on the problem of the aqueous medium of metal transport: basinal brines or groundwaters.
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Sulfur isotope geochemistry of Southern Appalachian mississippi valley-type deposits
TL;DR: Sulfur isotope analyses were carried out on ore minerals from Mississippi Valley-type deposits throughout the southern Appalachians, as well as on evaporite sulfate minerals that might have supplied this sulfur, in an effort to determine the origin(s) of sulfur in the deposits as mentioned in this paper.
Listric Normal Faults: An Illustrated Summary
TL;DR: A listric normal fault as discussed by the authors is a type of structural trap that occurs where brittle rocks overlie ductile rocks in an extensional regime, as evidenced by transtension associated with strikeslip movement and arched strata in a compressive setting.