Geology and ore deposits of the Breckenridge district, Colorado

Ransome, Frederick Leslie

doi:10.3133/pp75

Cited by 13 publications

(26 citation statements)

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“…Mapped as Cretaceous Pierre Shale (Ransome, 1911), possibly intruded by Tertiary quartz monzonite and located on the west side of the Elkhorn thrust fault (Bryant and others, 1981).…”

Section: -42 (Boreas Pass Quadrangle) Claims At the Head Of Littlementioning

confidence: 99%

“…Mapped as monzonite porphyry (Ransome, 1911 Mapped as undifferentiated east-dipping, Pennsylvanian and Permian strata, intruded by a "white porphyry" sill and cut by northeast-trending veins and faults (Singewald, 1951).…”

Section: -46 (Boreas Pass Quadrangle) Claims On the North End Of Baldmentioning

confidence: 99%

“…Claim] umper (Breckenridge 1:24,000 quadrangle) (Ransome, 1911) maps the north end of Shock Hill as Cretaceous Dakota Sandstone overlain with shale. Monzonite porphyry is exposed on the northeast side of the hill.…”

Section: Mmentioning

confidence: 99%

“…Tract 32 is mapped as quartz monzonite porphyry, possibly overlain by Quaternary alluvium and dredge tailings in the lower elevations (Ransome, 1911). Brewery Hill is mapped as Cretaceous Pierre Shale Tertiary intruded by northwest-trending quartz monzonite stingers (Ransome, 1911).…”

mentioning

confidence: 99%

“…Brewery Hill is mapped as Cretaceous Pierre Shale Tertiary intruded by northwest-trending quartz monzonite stingers (Ransome, 1911). Tract 34 is mapped entirely within quartz monzonite porphyry (Ransome, 1911 The geology is mapped as Swandyke Hornblende gneiss and granite gneiss with local, small pegmatite bodies (Lovering, 1935 (Wilson and LaRock, 1992).…”

mentioning

confidence: 99%

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Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Wilson¹

1999

Open-File Report

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“…Mapped as Cretaceous Pierre Shale (Ransome, 1911), possibly intruded by Tertiary quartz monzonite and located on the west side of the Elkhorn thrust fault (Bryant and others, 1981).…”

Section: -42 (Boreas Pass Quadrangle) Claims At the Head Of Littlementioning

confidence: 99%

Section: -46 (Boreas Pass Quadrangle) Claims On the North End Of Baldmentioning

confidence: 99%

Section: Mmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Wilson¹

1999

Open-File Report

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Understanding kinematics of intra-arc transcurrent deformation: Paleomagnetic evidence from the Liquiñe-Ofqui fault zone (Chile, 38-41°S)

2014

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The Liquiñe-Ofqui fault zone (LOFZ) is a major~1000 km long dextral shear zone of southern Chile, likely related to strain partitioning of Nazca Plate oblique convergence with South America. To understand block rotation pattern along the LOFZ, we paleomagnetically sampled 55 sites (553 samples) between 38°S and 41°S. We gathered Oligocene to Pleistocene volcanics and Miocene granites at a maximum distance of 20 km from the LOFZ, and at both sides of it. Rotations with respect to South America, evaluated for 36 successful sites, show that crust around the LOFZ is fragmented in small blocks,~1 to 10 km in size. While some blocks (at both fault edges) undergo very large 150°-170°rotations, others do not rotate, even adjacent to fault walls. We infer that rotations affected equidimensional blocks, while elongated crust slivers were translated subparallel to the LOFZ, without rotating. Rotation pattern across the LOFZ is markedly asymmetric. East of the fault and adjacent to it, rotations are up to 150°-170°clockwise, and fade out~10 km east of fault. These data support a quasi-continuous crust kinematics, characterized by small rigid blocks drag by the underlying ductile crust flow, and imply 120 km of total fault offset. Conversely, crust west of the LOFZ is cut by seismically active NW-SE sinistral antithetic faults, and yields counterclockwise rotations up to 170°at 8-10 km from LOFZ, besides the unrotated blocks. Further data from the Chile fore arc are needed to understand block rotation kinematics and plate dynamics west of the LOFZ.

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Rich Crevices of Inquiry: Mining and Environmental History

Morrissey

2010

A Companion to American Environmental History

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Geology and ore deposits of the Breckenridge district, Colorado

Cited by 13 publications

References 0 publications

Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Understanding kinematics of intra-arc transcurrent deformation: Paleomagnetic evidence from the Liquiñe-Ofqui fault zone (Chile, 38-41°S)

Rich Crevices of Inquiry: Mining and Environmental History

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