Chronology of the Kašperské Hory orogenic gold deposit, Bohemian Massif, Czech Republic

Ackerman, Lukáš; Žák, Karel; Haluzová, Eva; Creaser, Robert A.; Svojtka, Martin; Pašava, Jan; Veselovský, František

doi:10.1007/s00126-018-0822-4

Cited by 4 publications

(1 citation statement)

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“…The Au occurrences, some of which constitute economically important Au deposits, formed between ca. 347 and 337 Ma (e.g., Mokrsko-Čelina, Kašperské Hory; Zachariáš et al 2001Zachariáš et al , 2013Ackerman et al 2019). Surprisingly, despite a great number of occurrences some of which are fairly voluminous, and an assumption that volcanosedimentary successions are the most likely source of Au (Morávek and Pouba 1987), no Au occurrence has previously been reported from the black shales, except for auriferous carbonate-quartz veins in Devonian organicrich phyllite in the northeastern part of the Bohemian Massif (Aichler et al 1990).…”

Section: Introductionmentioning

confidence: 99%

Multi-stage metal enrichment and formation of gold mineralization in black shales: the role of high heat flow in a rift setting

et al. 2023

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Black shales may serve as an important source of metals such as Co, Ni, or As, largely due to anoxic to euxinic conditions in association with high concentrations of sulfur leading to efficient scavenging and transport of metals from seawater into the seafloor sediment. We report on an unusual type of Au mineralization newly discovered in Ediacaran trench-slope black shales in the Bohemian Massif, Czech Republic. The Au enrichment is related to the formation of a quartz–sulfide vein system and a progressive evolution of ore-forming fluids with decreasing temperature, from Sb- to As-rich to final precipitation of native gold from silica and Au-bearing low-temperature hydrothermal colloidal solutions. The hydrothermal nature of these solutions is also documented by Li contents and isotope compositions which differ markedly between barren black shales and those carrying significant late-stage quartz-rich veins. The structural relationships and orientation of the associated quartz veins point to a close connection between vein emplacement and high heat flow in response to Ordovician rifting, and breakup of the northern margin of Gondwana, and opening of the Rheic Ocean. This triggered metal and sulfur remobilization, including Au, from the associated Neoproterozoic–Cambrian volcanosedimentary successions. The documented Au mineralization and its association with the Ordovician rift-related magmatic activity is different from the widespread Variscan Au occurrences in the Bohemian Massif. Our study thus provides a new genetic model potentially important for future exploration of Au also in other terrains underlain by a rifted Cadomian basement.

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Section: Introductionmentioning

confidence: 99%

Multi-stage metal enrichment and formation of gold mineralization in black shales: the role of high heat flow in a rift setting

et al. 2023

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The Boring Billion: A key to resolving controversy on ore-fluid source models for orogenic gold deposits?

Groves,

Santosh,

Wang

et al. 2024

Miner Deposita

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New precise age constraints of the Hatu gold belt, west Junggar, NW China: Implications for a 300 Ma magmatic hydrothermal event in post-collisional setting

An,

Qiu,

Zhang

et al. 2024

Geological Society of America Bulletin

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A 300 Ma magmatic hydrothermal ore-forming process is identified in the Hatu gold belt in west Junggar, northwest China, based on precise age constraint by secondary ion mass spectroscopy U-Pb dating of hydrothermal zircon and Ar-Ar dating of muscovite. The gold deposits in the Hatu belt (Hatu, Qi-V, Huilvshan, etc.) are similar in geology, with NE- and NW-trending orebodies composed of gold-bearing quartz veins and auriferous altered tuffaceous wall-rocks. Hydrothermal zircon grains separated from gold-bearing quartz veins in the Qi-V gold deposit provide a concordia age of 299.6 Ma and a nearly identical weighted mean 206Pb/238U age of 300 ± 2 Ma. Muscovite samples also from the gold-bearing quartz veins yield 40Ar/39Ar plateau ages of 299.6 ± 1.7 Ma, 299.9 ± 1.8 Ma, and 300.6 ± 1.9 Ma. By comprehensive compilation of geological and geochemical characteristics, tectonic evolution, and geochronology of the gold deposits in the Hatu gold belt, our new precise age data confirm that the gold deposits in the Hatu belt formed simultaneously at ca. 300 Ma, and likely formed during a post-collisional extensional setting by magmatic hydrothermal fluid from cooling magmatic sources.

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Chronology of the Kašperské Hory orogenic gold deposit, Bohemian Massif, Czech Republic

Cited by 4 publications

References 59 publications

Multi-stage metal enrichment and formation of gold mineralization in black shales: the role of high heat flow in a rift setting

Multi-stage metal enrichment and formation of gold mineralization in black shales: the role of high heat flow in a rift setting

The Boring Billion: A key to resolving controversy on ore-fluid source models for orogenic gold deposits?

New precise age constraints of the Hatu gold belt, west Junggar, NW China: Implications for a 300 Ma magmatic hydrothermal event in post-collisional setting

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