The Black Angel deposit, Greenland: a Paleoproterozoic evaporite-related Mississippi Valley-type Zn–Pb deposit

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چکیده

Abstract The Paleoproterozoic Mârmorilik Formation in the Karrat basin of West Greenland hosts Black Angel Zn–Pb deposit. Chlorine-rich scapolite, zones with vuggy porosity and quartz nodules ore-bearing marble are herein interpreted to represent metamorphosed, vanished, replaced evaporites, respectively. Mineralization is closely associated anhydrite δ 34 S values (5.2–12.6‰) broadly comparable published for seawater sulfate. Considering fundamental attributes mineralization host sequence, a Mississippi Valley-type (MVT) model most obvious explanation mineralization. Overlying sequence organic-rich semipelites massive calcitic marbles, which may have served as seals hydrocarbon or reduced sulfur acted chemical traps deposition sulfidic ore. contained an interlayered sulfate-rich evaporite-carbonate common setting MVT deposits late Neoproterozoic Phanerozoic, but unique among few known Paleoproterozoic. This ca. 1915 Ma platform younger than sulfate evaporites deposited during immediately after 2220–2060 Lomagundi carbon isotope excursion records significant level time interval when it was assumed that had been too low form extensive evaporite deposits. Therefore, clastic-dominated (CD) geological record might progressively fill apparent gap marine provide insights into Proterozoic level. tectonic events affected basin, took place between Nagssugtoqidian collision (< 1860 Ma) Rinkian metamorphism (ca. 1830 Ma).

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ژورنال

عنوان ژورنال: Mineralium Deposita

سال: 2022

ISSN: ['1432-1866', '0026-4598']

DOI: https://doi.org/10.1007/s00126-022-01125-z