Two-event lode-ore deposition at Butte, USA: 40Ar/39Ar and U-Pb documentation of Ag-Au-polymetallic lodes overprinted by younger stockwork Cu-Mo ores and penecontemporaneous Cu lodes

Lund, Karen; McAleer, Ryan J.; Aleinikoff, John N.; Kunk, Michael J.

doi:10.1016/j.oregeorev.2018.05.018

Cited by 11 publications

(2 citation statements)

References 70 publications

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“…In that model, heterogeneity in the thickness of sandstones within the Lower clastic member was used to infer tectonic partitioning into distinct subbasins during early growth of low-magnitude, intraforeland basement arches, and doming above igneous intrusive rocks. However, geochronological work on the Boulder batholith and smaller associated stocks in southwestern Montana reveal a dominant age cluster around ∼70-75 Ma (Lund et al, 2002(Lund et al, , 2018, which suggests that local igneous doming is much younger than previously inferred by this depositional model. Alternative interpretations for thickness variations are that the strata were deposited atop a dissected pre-Cretaceous surface with notable relief and subtle local topographic highs (Dolson & Piombino, 1994) or an irregular flexural forebulge (Carrapa et al, 2019;DeCelles & Giles, 1996;Fuentes et al, 2011).…”

Section: Kootenai Formationmentioning

confidence: 52%

Early Cretaceous Provenance, Sediment Dispersal, and Foreland Basin Development in Southwestern Montana, North American Cordillera

2021

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Retroforeland basins form adjacent to fold-thrust belts and contain the stratigraphic record of mountain building (DeCelles, 2012;Ingersoll, 2012). In some cases, where portions of the hinterland have been displaced along major strike-slip faults, the foreland basin system may hold key information for unraveling complex geological histories as it remained stationary on the continent during orogenesis (e.g., Wyld et al., 2006). During Early Cretaceous time, the western margin of the Idaho-Montana sector of the North America Cordillera was subject to outboard terrane accretion and translation, decreased arc magmatism, growth of the Sevier orogenic belt, and development of a retroforeland basin system on the stable portion of the continent (Figure 1; DeCelles, 2004;Gehrels et al., 2009;Gray et al., 2019;Wyld et al., 2006). During this time, this foreland basin system expanded to several hundred kilometers in width, developed an asymmetric geometry, and spanned the length of the continent (DeCelles, 2004).Numerous models for North American sediment dispersal during Early Cretaceous time have been proposed. However, there is a notable gap in U-Pb detrital zircon data from the Idaho-Montana sector of the foreland basin system (e.g., Blum & Pecha, 2014;Leier & Gehrels, 2011;Schwartz & DeCelles, 1988). Some regional models for this time interval have focused on complexity in southwestern Montana, where early activity along thick-skinned thrusts has been documented in the distal parts of the foreland; these prior studies suggest that the record of basement-involved deformation may substantially predate activity along similar thick-skinned structures elsewhere in the Laramide province (

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Section: Kootenai Formationmentioning

confidence: 52%

Early Cretaceous Provenance, Sediment Dispersal, and Foreland Basin Development in Southwestern Montana, North American Cordillera

2021

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“…To the south of Butte is Archean crystalline basement. Stockwork porphyry mineralization occurred at ~ 66-64 Ma likely related to dike emplacement (Lund et al 2002(Lund et al , 2018Dilles et al 2003).…”

Section: Porphyry Cu-mo-au Depositsmagmatic-hydrothermalmentioning

confidence: 99%

Hydrothermal monazite and xenotime chemistry as genetic discriminators for intrusion-related and orogenic gold deposits: implications for an orogenic origin of the Pogo gold deposit, Alaska

Taylor,

Graham,

Lowers

2023

Miner Deposita

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Attempts to geochemically distinguish between metamorphic-hydrothermal systems that form orogenic gold deposits and both reduced and oxidized magmatic-hydrothermal systems using isotopes or metal associations have proven ambiguous, particularly for orogenic gold and reduced intrusion-related gold systems. The absence of conclusive geochemical discriminators and the overlap in geologic characteristics have led to gold deposit models being potentially incorrectly applied, which in turn negatively affect regional mineral exploration and mine planning. In this study, in situ electron microprobe geochemical analyses of hydrothermal monazite and xenotime crystals associated with different types of gold-bearing deposits are shown to be effective geochemical discriminators. There are notable differences in mineral chemistry such as rare earth element (REE) profiles, total light REE, Dy, Er, Pr, Y, Nd/Sm, and La/Sm that distinguish monazite precipitated from metamorphic-hydrothermal fluids that form orogenic gold deposits and those precipitated from magmatic-hydrothermal fluids that form both porphyry Cu-Mo-Au and reduced intrusion-related gold deposits. Notable differences in overall xenotime abundances and concentrations of heavy REEs, Ca, and Sc are distinctive between the different deposit classes for xenotime. The origin of the controversially classified Pogo gold deposit, Tintina gold province, Alaska, which has been characterized as both a reduced intrusion-related and an orogenic gold deposit, is tested based upon the noted chemical differences associated with these hydrothermal phosphates. The findings of this study have implications for exploration and mine development in the Tintina gold province and other areas that contain deposits that are controversially classified as either orogenic or as magmatic-hydrothermal gold deposits.

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Evolution of the magmatic-hydrothermal system at the Erdenetiin Ovoo porphyry Cu-Mo deposit, Mongolia: constraints on the relative timing of alteration and mineralization

Monecke,

Reynolds,

Gonchig

et al. 2023

Miner Deposita

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Two-event lode-ore deposition at Butte, USA: 40Ar/39Ar and U-Pb documentation of Ag-Au-polymetallic lodes overprinted by younger stockwork Cu-Mo ores and penecontemporaneous Cu lodes

Cited by 11 publications

References 70 publications

Early Cretaceous Provenance, Sediment Dispersal, and Foreland Basin Development in Southwestern Montana, North American Cordillera

Early Cretaceous Provenance, Sediment Dispersal, and Foreland Basin Development in Southwestern Montana, North American Cordillera

Hydrothermal monazite and xenotime chemistry as genetic discriminators for intrusion-related and orogenic gold deposits: implications for an orogenic origin of the Pogo gold deposit, Alaska

Evolution of the magmatic-hydrothermal system at the Erdenetiin Ovoo porphyry Cu-Mo deposit, Mongolia: constraints on the relative timing of alteration and mineralization

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