Igneous rocks and related mineral deposits of the Barker Quadrangle, Little Belt Mountains, Montana

Witkind, Irving Jerome

doi:10.3133/pp752

Cited by 10 publications

(13 citation statements)

References 7 publications

(13 reference statements)

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“…In spite of the small number of studies which document cross sections of plutons, several examples from outside the Alps illustrate the transition from a zone of ascent within a steep shear zone to flat‐lying plutons adjacent to, but outside of, the shear zone [ Witkind , 1973; Castro , 1986; Reavy , 1989; Cruden and Aaro , 1992; Aranguren et al , 1997; Archanjo et al , 1999; Gilder and McNulty , 1999; Kalakay et al , 2001]. In contrast, gravimetric studies of syntectonic plutons indicate that the deepest parts of the intrusive bodies are not located within the fault zone itself, suggesting that the feeders are systematically offset with respect to the fault zone [ Vigneresse , 1995].…”

Section: Discussionmentioning

confidence: 99%

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

2004

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The Alpine Oligocene plutons are spatially and temporally associated with the activity of the Periadriatic Fault System (PFS), an orogen‐parallel, crustal‐scale transpressive mylonitic belt. Excellent three‐dimensional exposure, combined with a wealth of structural, seismic, petrological, geochronological, geochemical, and paleomagnetic data collected over the last decades help to constrain the relationships between deformation, ascent, and emplacement of the plutons. Magmas were channeled from the base of the thickened continental crust into the narrow mylonitic belt of the Periadriatic Fault System, which was used as ascent pathway to cover vertical lengths of 20 to 40 km. Therefore the linear alignment of the plutons at the surface is not the expression of a linear source region at depth. Ascent of the melts is controlled by the mylonitic foliation of the PFS, which forms the only steep anisotropy, continuously traversing the entire Alpine crust. In contrast, the flow direction is not influenced by the specific kinematics of the faults. Final emplacement of the plutons occurred by extrusion from the Periadriatic Fault System into the adjacent country rocks. The transition from ascent to final emplacement is favored by partitioning of transpressive deformation.

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Section: Discussionmentioning

confidence: 99%

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

2004

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“…The oldest Cenozoic topaz rhyolites we know of (about 50 Ma) are exposed in the Little Belt Mountains of central Montana (Weed 1900;Pirsson 1900;Witkind 1973). The mountainous terrain exposes several major alkaline and calc-alkaline plutons that may be genetically related to the volcanic cover (Witkind 1973).…”

Section: Little Belt Mountains Central Montanamentioning

confidence: 99%

The Geology and Geochemistry of Cenozoic Topaz Rhyolites from the Western United States

Christiansen¹,

Sheridan²,

Burt³

1986

Geological Society of America Special Papers

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“…Dry Fork Belt Creek (site 4, Fig. 1) drains the Barker mining district where hydrothermal Pb-Ag sulfide ore deposits were mined in the late 1800s and 1900s (Witkind, 1973). Zinc is the metal of primary concern in the river.…”

Section: Introductionmentioning

confidence: 99%

Isotopic variations of dissolved copper and zinc in stream waters affected by historical mining

Borrok¹,

Nimick²,

Wanty³

et al. 2008

Geochimica et Cosmochimica Acta

126

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Igneous rocks and related mineral deposits of the Barker Quadrangle, Little Belt Mountains, Montana

Cited by 10 publications

References 7 publications

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

Shear zones and magma ascent: A model based on a review of the Tertiary magmatism in the Alps

The Geology and Geochemistry of Cenozoic Topaz Rhyolites from the Western United States

Isotopic variations of dissolved copper and zinc in stream waters affected by historical mining

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