Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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Fridrich, C.J., 1986, The Grizzley Peak cauldron, Colorado - Structure and petrology of a deeply dissected resurgent ash-flow caldera: Stanford, Calif., Stanford University, Ph.D. thesis, 201 p. Fridrich, C.J., and Mahood, G.A., 1984, Reverse zoning in the resurgent intrusions of the Grizzley Peak cauldron, Sawatch Range, Colorado: Geological Society of America Bulletin, v. 95, p. 779-787. Fridrich, C.J., DeWitt, E., Bryant, B., Richard, S., and Smith, R.P., 1998, Geologic map of the Collegiate Peaks Wilderness Area and the Grizzley Peak caldera, Sawatch Range, central Colorado: U.S. Geological Survey Miscellaneous Investigations Series I-2565, scale 1:50,000. Gibbs, A.D., 1984, Structural evolution of extensional basin margins: Journal of the Geological Society of London, v.141, p. 609-620. Guilinger, J.R., and Keller, J.W., 2002, Directory of active permitted mines and mine permits in Colorado – 2002: Colorado Geological Survey Information Series 68, 40 p., map 1:500,000. Hayden, F.V., 1869, Preliminary field report [Third] Annual report of the United States Geological and Geographical Survey of the territories, Colorado and New Mexico: Washington, U.S. Govt. Printing Office, 155 p. Heimann, A., Spry, P.G., and Teale, G.S., 2005, Zincian spinel associated with metamorphosed Proterozoic base-metal sulfide occurrences, Colorado; A reevaluation of gahnite composition as a guide in exploration: Canadian Mineralogist, v. 43, p. 601-622. Heinrich, E.W., 1981, Precambrian tungsten and copper-zinc skarn deposits of southcentral Colorado: Colorado Geological Survey Resource Series 21, 115 p. Hubbard, M.S., Oviatt, C.G., Kelley, S., Perkins, M.E., Hodges, K.V., and Robbins, R., 2001, Oligocene-Miocene basin formation and modification in the northern Rio Grande rift; Constraints from 40 Ar/ 39 Ar, fission track and tephrochronology [abstr.]: Geological Society of America Abstracts With Programs, v. 33, no.6, p. A-257. Humphreys, W.J., 1914 through 1924, Seismological reports for October 1914 to June 1924: U.S. Weather Bureau, Monthly Weather Review, Section V-Seismology. 208
Hutchinson, R.M., and Hedge, C.E., 1967, Precambrian basement rocks of the central Colorado Front Range and its 700-million-year history: Geological Society America, Rocky Mountain Section, Annual Meeting, 20 th , Golden, Colorado, Guidebook No. 1, 51 p. IUGS Classification: International Union of Geological Sciences Subcommission of Systematics of Igneous Rocks: See Streckeisen (1973, 1976 and 1979). Ingram, R.L., 1989, Grain-size scales, in Dutro, J.T., Jr., Dietrich, R.V., and Foose, R.M., compilers, AGI data sheets—for geology in the field, laboratory, and office (3 rd ed.): Alexandria, Va., American Geological Institute, sheet 29.1. International Commission on Stratigraphy, 2005, International stratigraphic chart: downloaded January 2006 from the International Commission on Stratigraphy website, www.stratigraphy.org/chus.pdf. Keller, J.W., McCalpin, J.P., and Lowry, B.W., 2004 Geologic map of the Buena Vista East quadrangle, Chaffee County, Colorado: Colorado Geological Survey Open- File Report 04-4, scale 1:24,000, 1 CD-ROM. Kirkham, R.M., and Rogers, W.P., 1981, Earthquake potential in Colorado: Colorado Geological Survey Bulletin 43, 171 p. Kirkham, R.M., and Rogers, W.P., 2000, Colorado earthquake information, 1867-1996: Colorado Geological Survey Bulletin 52, CD-ROM. Kluth, C.F., and Coney, P.J., 1981, Plate tectonics of the Ancestral Rocky Mountains: Geology, v. 9, p. 10-15. Knepper, D.H., 1974, Tectonic analysis of the Rio Grande rift zone, central Colorado: Golden, Colo., Colorado School of Mines, Ph.D. thesis (T-1593), 237 p. Knepper, D.H., 1976, Late Cenozoic structure of the Rio Grande rift zone, central Colorado, in Epis, R.C. and Weimer, R.J., eds., Studies in Colorado field geology: Professional Contributions of the Colorado School of Mines, no. 8, p.421-430. Knight, D.C., 1981, Stratigraphy and mineralogy of a zinc-rich sillimanite gneiss near Maysville, Chaffee County, Colorado: Winnipeg, Manitoba, University of Manitoba, M.Sc. thesis, 94 p. Kouther, M.J.H., 1969, Geology and mineralization of the northwest part of the Bonanza quadrangle, Chaffee and Saguache Counties, Colorado: Golden, Colo., Colorado 209
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
Page 23 and 24:
Figure 5. Detailed geologic-structu
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with the Colorado mineral belt (Boo
Page 27 and 28:
Shannon, 2005). Widmann and others
Page 29 and 30:
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
Page 41 and 42:
weathered, but Mount Princeton quar
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stratified, matrix-supported, bould
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as rockfalls, rock avalanches, rock
Page 47 and 48:
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
Page 55 and 56:
lithologies are variable and depend
Page 57 and 58:
Arkansas River in parts of Redman C
Page 59 and 60:
angular to subangular. Deposits gen
Page 61 and 62:
elations, age constraints from foss
Page 63 and 64:
elated to the inferred Squaw Creek
Page 65 and 66:
Figure 14. Crude bedding in coarse
Page 67 and 68:
microcline, and muscovite. The latt
Page 69 and 70:
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
Page 79 and 80:
One age determination on the rhyoli
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northwest-trending fault. Thus, fie
Page 83 and 84:
on the North Fork leucogranite intr
Page 85 and 86:
A small 400 by 400 foot body of Nor
Page 87 and 88:
N12°E, 62°NW (about 6,000 ft sout
Page 89 and 90:
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
Page 95 and 96:
Mount Aetna ring dikes (Tma), one i
Page 97 and 98:
the margins of the pluton, includin
Page 99 and 100:
Shannon (1988). The average of seve
Page 101 and 102:
indicating a granite b composition
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analysis by Crawford (1913), two an
Page 105 and 106:
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
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sometimes terminate at a cross stru
Page 157 and 158: limestone that is exposed in a wind
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
Page 167 and 168: as at the mouth of Squaw Creek. How
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 and 206: to Rudy C. Epis: Colorado School of
Page 207: University, M.Sc. thesis, 50 p. Din
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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