Geologic Setting, Sedimentary Architecture, and Paragenesis of the Mesoproterozoic Sediment-Hosted Sheep Creek Cu-Co-Ag Deposit, Helena Embayment, Montana

Graham, Garth E.; Hitzman, Murray W.; Zieg, Jerry

doi:10.2113/econgeo.107.6.1115

Cited by 16 publications

(29 citation statements)

References 28 publications

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“…7f, g and Xu et al, 2013). These textural features in the early stage of Co-Cu mineralization are extremely similar to those of the Mesoproterozoic sediment-hosted Sheep Creek Cu-Co-Ag deposit in the Belt-Purcell basin (Graham et al, 2012), and thus can be considered to be syngenetic and/or diagenetic in origin, but have been strongly reworked by the late-stage shearing and related dynamic metamorphism (Xu et al, 2013). In contrast, the disseminated, stockwork and brecciated sulfide minerals (Xu et al, 2013) likely are attributed to recrystallization due to the late stage of shearing and/or hydrothermal alteration.…”

Section: Petrography and Mineralogy Of The Quartz Itabirites And Co-csupporting

confidence: 55%

Petrography and geochemistry of the Shilu Fe–Co–Cu ore district, South China: Implications for the origin of a Neoproterozoic BIF system

Wang

Chen

et al. 2014

Ore Geology Reviews

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Section: Petrography and Mineralogy Of The Quartz Itabirites And Co-csupporting

confidence: 55%

Petrography and geochemistry of the Shilu Fe–Co–Cu ore district, South China: Implications for the origin of a Neoproterozoic BIF system

Wang

Chen

et al. 2014

Ore Geology Reviews

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“…5A-D) may have precipitated at the same time as the sediment, as this texture is typical of pyrite formed in sedimentary environments (Graham et al, 2012). The large volume of pyrite associated with stage I suggests that before precipitation the Fe-S system existed in oxidized conditions, allowing abundant Fe-S-rich fluids to be carried to the site of deposition.…”

Section: Formation Of Sedimentary Pyrite Of Stage Imentioning

confidence: 95%

Ore geology and fluid evolution of the giant Caixiashan carbonate-hosted Zn–Pb deposit in the Eastern Tianshan, NW China

Chen

Zhang

et al. 2016

Ore Geology Reviews

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“…The east-west trending Helena Embayment on the eastern margin of the Belt Basin is superimposed on the overall northwest basin trend and has been inferred to record north-south extension (Winston, 1986) or dextral strike-slip displacement (Price and Sears, 2000). Sedimentation within the Belt Basin is reportedly controlled by syndepositional displacement along faults recorded by thickness variations (e.g., McMannis, 1963;Winston, 1986;Höy etal., 2000;Mauk and White, 2004;Graham et al, 2012). Mesoproterozoic displacement on the Osburn fault, a major structure in the Lewis and Clark fault zone, is inferred to account for thickness variations in the Revett Formation in the Coeur d'Alene district (Mauk and White, 2004).…”

Section: Structural Settingmentioning

confidence: 98%

Relationships between deformation and mesothermal veins in the Sunshine Mine Area, Coeur d'Alene district, Idaho

Ferraro¹

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The Coeur d'Alene district in northern Idaho is a world class Pb-Ag mesothermal vein system that has produced about 360 million ounces of silver, lead, and zinc since the 1880s. Despite the long history of exploration and production, the district does not have a predictive model for exploration based on a sound understanding of structural controls on the silver ore deposits; this is certainly the case for the Sunshine Mine and surrounding area. Fault kinematic history in the district shows a regional scale faultsystem reactivated over time with dextral, sinistral, and dip-slip displacement. The fault system is superimposed on regional deformation fabrics that were examined for this study in the Sunshine Mine area. Cleavage sets observed in the Sunshine mine area, distinguished by orientation and superposition relationships, are consistent with the findings of Smith (2004) which defined cleavage sets referred to as S1, S2, and S3. Two additional deformation fabrics that appear spatially tied to fault zones formed between development of cleavages S2 and S3. The multiple cleavages, fault zones, and their intersections are interpreted to act as pathways for hydrothermal fluids associated with vein formation and silver ore deposition. Thin section kinematic analysis of vein and shear zone samples defined a dip-slip sense of shear associated with the Sterling vein. Electron Backscatter Diffraction (EBSD) analysis of vein and shear zone samples failed to define a lattice preferred crystallographic orientation that defined shear sense. Similarly, cathodoluminescence (CL) analysis of thin section texturesfailed to define a dominant shear sense and fault kinematics. Nevertheless, additional study using these techniques is warranted. Both field observation and thin section analysis demonstrate a direct relationship between shear zones, veins, and mineralization potential, clarifying the need for detailed fault maps for the Sunshine Mine area and Coeur d'Alene district. v

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Geologic Setting, Sedimentary Architecture, and Paragenesis of the Mesoproterozoic Sediment-Hosted Sheep Creek Cu-Co-Ag Deposit, Helena Embayment, Montana

Cited by 16 publications

References 28 publications

Petrography and geochemistry of the Shilu Fe–Co–Cu ore district, South China: Implications for the origin of a Neoproterozoic BIF system

Petrography and geochemistry of the Shilu Fe–Co–Cu ore district, South China: Implications for the origin of a Neoproterozoic BIF system

Ore geology and fluid evolution of the giant Caixiashan carbonate-hosted Zn–Pb deposit in the Eastern Tianshan, NW China

Relationships between deformation and mesothermal veins in the Sunshine Mine Area, Coeur d'Alene district, Idaho

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