Genetic model for Jurassic shale-hosted Zn-Pb deposits of the Arak Mining District, Malayer-Esfahan metallogenic belt: insight from sedimentological, textural, and stable isotope characteristics
| Autor: | Pouria Mahmoodi, Pura Alfonso, Jan M. Peter, Carles Canet, Abdorrahman Rajabi, Ebrahim Rastad |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Mineralization (geology)
Anoxic basin Enginyeria civil::Geologia::Mineralogia [Àrees temàtiques de la UPC] 020209 energy Geochemistry Zn-Pb deposit 02 engineering and technology engineering.material Mineralogy -- Iran 010502 geochemistry & geophysics 01 natural sciences Mineralogia -- Iran Siderite chemistry.chemical_compound δ34S Jaciments minerals -- Iran Geochemistry and Petrology Ore deposits -- Iran 0202 electrical engineering electronic engineering information engineering Seawater sulfate reduction Fluid inclusions 0105 earth and related environmental sciences Chalcopyrite Ore facies Sediments (Geologia) Sediments (Geology) Geology Hydrothermal venting Diagenesis Sphalerite chemistry visual_art visual_art.visual_art_medium engineering Sedex deposits Economic Geology Pyrite |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ The Hossein-Abad and Western Haft-Savaran Zn-Pb SEDEX deposits are located in the Arak basin of the Malayer-Esfahan Metallogenic Belt, Iran. This metallotect formed in a back-arc paleotectonic setting as a result of the subduction of the Neo-Tethys oceanic plate beneath the Sanandaj-Sirjan Zone. The rocks that host the mineralization are Jurassic organic matter-bearing, fine-grained sandstones, siltstones and shales. Asymmetric lenticular bedding, unidirectional flow (based on oblique silt lamination direction relative to horizontal bedding), graded bedding and clay-rich interbeds indicate sediments were deposited from turbidity currents in a low-energy basin environment. There are three ore facies in the Hossein-Abad and Western Haft-Savaran Zn-Pb deposits: 1) bedded ore; 2) massive ore; 3) feeder zone. Bedded ore contains pyrite framboids and polyframboidal clusters. The size range of the pyrite framboids (3 to 6 µm in diameter) indicates they formed in the water column and not in the subsurface. Characteristic structures in bedded ore are: 1) sulfide-bearing silt injections into clay-filled burrows 2) injection of sulfide-bearing silt into flame structures of claystone laminae, and 3) organic matter in claystone oriented oblique relative to bedding. These structures are the result of seismic deformation induced by synsedimentary earthquakes, whereby sulfides that formed in permeable unconsolidated sediment were injected into organic matter-bearing claystone unit. The d18O and d13C values of siderite, calcite and dolomite in veins from the feeder zone and massive ore range from 12.2 to 23.8 ‰ and -16.7 to 1.7 ‰, respectively. These values indicate that formational water, seawater and organic matter oxidationdecomposition all played a role in hydrothermal carbonate formation. Melting and homogenization temperatures for CO2 for CO2-bearing fluid inclusions range from -57.5 to -60 °C and 6.6 to 29.5 °C, respectively, and indicate the presence of |
| Databáze: | OpenAIRE |
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