Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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asin, Chaffee County, Colorado: Phoenix, Ariz., University of Arizona, M.Sc. thesis, 243 p. Crawford, R.D., 1913, Geology and ore deposits of the Monarch and Tomichi mining districts, Colorado: Colorado Geological Survey Bulletin 4, 313 p. Cunningham, C.G., Naeser, C.W., Marvin, R.F., Luedke, R.G., and Wallace, A.R., 1994, Ages of selected intrusive rocks and associated ore deposits in the Colorado mineral belt: U.S. Geological Survey Bulletin 2109, 31 p. Czamanske, G.K., Foland, K.A., Hubacher, F.A., and Allen, J.C., 1990, The 40 Ar/ 39 Ar chronology of caldera formation, intrusive activity, and Mo-ore deposition near Questa, New Mexico, in Bauer, P.W., Lucas, S.G., Mawer, C.K., and McIntosh, W.C., eds., Tectonic development of the southern Sangre de Cristo Mountains, New Mexico: New Mexico Geological Society Guidebook 41, p. 355-358. Dalrymple, G.B., 1979, Critical tables for conversion of K-Ar ages from old to new constants: Geology. v. 7, p. 558-560. De la Roche, H., Leterrier, J., Grandclaude, P., and Marchal, M., 1980, A classification of volcanic and plutonic rocks using R 1 R 2 -diagram and major-element analyses- its relationship with current nomenclature: Chemical Geology, v. 29, p. 183-210. De Voto, R.H., 1971, Geologic history of South Park and geology of the Antero Reservoir quadrangle, Colorado: Colorado School of Mines Quarterly, v. 66, no. 4, 90 p., scale: 1:62,500. De Voto, R.H., 1972, Pennsylvanian and Permian stratigraphy and tectonism in central Colorado, in De Voto, R. H., ed., Paleozoic stratigraphy and structural evolution of Colorado: Quarterly of the Colorado School of Mines, v. 67, no. 4, p. 139-185. De Voto, R.H., 1990, Paleozoic stratigraphy, tectonism, thermal history, and basin evolution of central Colorado: Economic Geology Monograph 7, p. 29-44. De Voto, R.H., and Peel, F.A., 1972, Pennsylvanian and Permian stratigraphy and structural history, northern Sangre de Cristo Range, Colorado: Colorado School of Mines Quarterly, v. 67, p.283-320. DeWitt, E., 1987, Written communication. Denesha, C.V., 2003, Tertiary faulting and its relation to basin architecture in the Upper Arkansas basin, Northern Rio Grande rift: Manhattan, Kansas, Kansas State 206
University, M.Sc. thesis, 50 p. Dings, M.R., and Robinson, C.S., 1957, Geology and ore deposits of the Garfield quadrangle, Colorado: U.S. Geological Survey Professional Paper 289, 110 p. Dippold, C.L., 1999, The geometry and kinematics of the Poncha Pass transfer zone, northern Rio Grande rift, south-central Colorado: Manhattan, Kansas, Kansas State University, M.Sc. thesis,90 p. Dunn, L.G., 2003, Colorado Mining Districts: A Reference: Colorado School of Mines Library, ISBN: 0-918062-19-5. Eaton, G.P., 1979, A plate-tectonic model for Late Cenozoic crustal spreading in the western United States, in Riecker, R.E., ed., Rio Grande Rift; Tectonics and magmatism: Washington, D.C., American Geophysical Union, p. 7-32 Emmons, S.F., 1886, Geology and mining industry of Leadville, Colorado: U.S. Geological Survey Monograph 12. Emmons, S.F., Irving, J.D., and Loughlin, G.F., 1927, Geology and ore deposits of the Leadville mining district, Colorado: U.S. Geological Survey Professional Paper 148, p. 1-20. Epis, R.C., and Chapin, C.E., 1968, Geologic history of the Thirtynine Mile volcanic field, central Colorado, in Epis, R.C., ed., Cenozoic volcanism in the southern Rocky Mountains: Colorado School of Mines Quarterly, v. 63, no. 3, p. 51-85. Epis, R.C., and Chapin, C.E., 1974, Stratigraphic nomenclature of the Thirtynine Mile volcanic field, central Colorado: U.S. Geological Survey Bulletin 1395-C, 23 p. Epis, R.C., and Chapin, C.E., 1975, Geomorphic and tectonic implications of the post- Laramide, late Eocene erosion surface in the southern Rocky Mountains, in Curtis, B.F., ed., Cenozoic history of the southern Rocky Mountains: Geological Society of America Memoir 144, p. 45-74 Epis, R.C., Scott, G.R., Taylor, R.B., and Chapin, C.E., 1980, Summary of Cenozoic geomorphic, volcanic, and tectonic features of central Colorado and ajoining areas, in Kent, H.C. and Porter, K.W., eds., Colorado geology: Denver, Colorado., Rocky Mountain Association of Geologists, p. 135-156. Folk, R.L., and Ward, W.C., 1957, Brazos River bar; A study in the significance of grain size parameters: Journal of Sedimentary Petrology, v. 27, p. 3-26. 207
Page 1 and 2:
OPEN-FILE REPORT 06-10 Geologic Map
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TABLE OF CONTENTS Introduction…
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mylonitic, augen textures………
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INTRODUCTION LOCATION AND ACCESS Th
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SAWATCH RANGE RIFT-SHOULDER UPLIFT
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of the South Arkansas River (subseq
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EXPLANATION Rio Grande Rift Neogene
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in descriptions of the geologic uni
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During the Early and Middle Paleozo
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Mountains, and White River uplifts
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field are the largest remnants of t
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Figure 5. Detailed geologic-structu
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with the Colorado mineral belt (Boo
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Shannon, 2005). Widmann and others
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the Upper Arkansas graben (fig. 5)
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15-minute quadrangle, which is adja
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etween the northern and southern se
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on U.S. Forest Service color aerial
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We use fractional map units on the
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Qpt Pinedale till, undivided (late
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weathered, but Mount Princeton quar
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stratified, matrix-supported, bould
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as rockfalls, rock avalanches, rock
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stream-channel deposits of all pere
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Figure 10. View west up South Arkan
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Figure 11. View west up South Arkan
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valley near the eastern map boundar
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lithologies are variable and depend
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Arkansas River in parts of Redman C
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angular to subangular. Deposits gen
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elations, age constraints from foss
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elated to the inferred Squaw Creek
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Figure 14. Crude bedding in coarse
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microcline, and muscovite. The latt
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Volcanic Ash Figure 17. View of eas
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Figure 18. Close-up view of intense
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The western zone of brecciated Pale
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Tr Rhyolite dikes (early to late Ol
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as the overall N47°E trend of the
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One age determination on the rhyoli
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northwest-trending fault. Thus, fie
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on the North Fork leucogranite intr
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A small 400 by 400 foot body of Nor
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N12°E, 62°NW (about 6,000 ft sout
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The age of the quartz latite porphy
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Tma Mount Aetna quartz monzonite po
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of the Maysville quadrangle and the
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Mount Aetna ring dikes (Tma), one i
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the margins of the pluton, includin
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Shannon (1988). The average of seve
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indicating a granite b composition
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analysis by Crawford (1913), two an
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locally tanish to pinkish gray. It
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quadrangle (tables 1 and 3) were fr
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slices of Paleozoic sedimentary roc
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south-southwest of Maysville is a 9
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There is one additional Paleozoic s
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near the southwest margin of the qu
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eastern contact of the diorite intr
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endoskarn zones. The two widely sep
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Xhig) along the southeastern contac
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Xgd Granodiorite (Early Proterozoic
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Hybrid granodiorite is locally deve
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Xcs Calc-silicate gneiss (Early Pro
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Many of the calc-silicate gneiss zo
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typically expressed by intermittent
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The field relations and characteris
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the north side of all three segment
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eplaced by muscovite. The western m
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sillimanite-quartz-muscovite that a
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sillimanite gneiss (Xmsg) and the m
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Figure 35. Outcrop of Proterozoic h
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samples) indicates they are compose
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Xal Lineated amphibolite (Early Pro
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of the Proterozoic metamorphic rock
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that the present structural configu
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elated to rotation of domain blocks
Page 155 and 156: sometimes terminate at a cross stru
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Page 159 and 160: quadrangle are intimately associate
Page 161 and 162: of the quadrangle. The north-northw
Page 163 and 164: quartz monzonite ring dikes (Tma).
Page 165 and 166: that truncates the Upper Arkansas g
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Page 169 and 170: adjacent to the southwestern edge o
Page 171 and 172: graben and the Upper Arkansas Valle
Page 173 and 174: GEOLOGIC HAZARDS Potential geologic
Page 175 and 176: In addition, older landslides may h
Page 177 and 178: sparse vegetation. One such area is
Page 179 and 180: Table 7. Historical (pre-instrument
Page 181 and 182: 4262272N. ECONOMIC GEOLOGY Currentl
Page 183 and 184: A number of the larger pegmatite bo
Page 185 and 186: River placers near Buena Vista (Van
Page 187 and 188: The small mines and prospects along
Page 189 and 190: elatively recent (post-1970) explor
Page 191 and 192: contact of two Quaternary gravels (
Page 193 and 194: quadrangle. The first area is a clu
Page 195 and 196: y Sharp (1976) to be a fault slice
Page 197 and 198: quadrant of the Maysville quadrangl
Page 199 and 200: the large Paleozoic rock outlier) i
Page 201 and 202: WATER RESOURCES Water resources on
Page 203 and 204: water near Maysville is being produ
Page 205: to Rudy C. Epis: Colorado School of
Page 209 and 210: Hutchinson, R.M., and Hedge, C.E.,
Page 211 and 212: Litsey, L.R., 1958, Stratigraphy an
Page 213 and 214: County, Colorado, in Berg, R.R., an
Page 215 and 216: Stark, J.T., and Barnes, F.F., 1935
Page 217 and 218: Tweto, O., 1987, Rock units of the
Page 219 and 220: quadrangle, Colorado: U.S. Geologic
Page 221 and 222: 94A 391996 4263422 Prospect YXp;Xbf
Page 223 and 224: 336A 396189 4274961 Prospect Xgdf B
Page 225: 854 391849 4268852 42 Adit; Geochem
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Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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