Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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REFERENCES Alers, B.K., and Shallow, J.M., 1996, Semiconformable Cu-Zn, Zn-Pb-Ag, synvolcanic mineralization and rhyolitic volcanic successions in polydeformed terranes of the Proterozoic Colorado province [abstr.]: Geological Society of America Abstracts With Programs, v. 28, no. 7, A-155. Best, M.G., 1982, Igneous and metamorphic petrology: New York, W.H. Freeman and Company, 630 p. Bickford, M.E., and Boardman, S.J., 1984, A Proterozoic volcano-plutonic terrane, Gunnison and Salida area, Colorado: Journal of Geology, v. 92, p. 657-666. Bickford, M.E., Schuster, R.D., and Boardman, S.J., 1989, U-Pb geochronology of the Proterozoic volcano-plutonic terrane in the Gunnison and Salida areas, Colorado, in Grambling, J.A. and Tewksbury, B. J., eds., Proterozoic geology of the southern Rocky Mountains: Geological Society of America Special Paper 235, p. 33-48. BLM LR2000, Bureau of Land Management Land & Mineral Legacy Rehost 2000 System (www.blm.gov/lr2000/). Boardman, S.J., 1976, Geology of the Precambrian metamorphic rocks of the Salida area, Chaffee County, Colorado: The Mountain Geologist, v. 13, no. 3, p. 89-100. Boardman, S.J., 1986, Early Proterozoic bimodal volcanic rocks in central Colorado, U.S.A., Part 1; Petrography, stratigraphy and depositional history: Precambrian Research, v. 34, p. 1-36. Boardman, S.J., and Condie, K.C., 1986, Early Proterozoic bimodal volcanic rocks in central Colorado, U.S.A., Part II; Geochemistry, petrogenesis and tectonic setting: Precambrian Research, v. 34, p. 37-68. Bookstrom, A.A., 1981, Tectonic setting and generation of Rocky Mountain porphyry molybdenum deposits: Arizona Geological Society Digest, v. 14, p. 215-226. Bookstrom, A.A., Carten, R.B., Shannon, J.R., and Smith, R.P., 1988, Origins of bimodal leucogranite-lamprophyre suites, Climax and Red Mountain porphyry molybdenum systems, Colorado: Petrologic and strontium isotopic evidence, in Part 3, Cenozoic volcanism in the southern Rocky Mountains revisited- A tribute 204
to Rudy C. Epis: Colorado School of Mines Quarterly, v. 83, no. 2, p. 1-24. Bosworth, W., Lambiase, J., and Keisler, R., 1986, A new look at Gregory’s rift; The structural style of continental rifting: Eos, v. 67, no. 29, p. 577, 582-583. Brock, M.R., and Barker, F., 1972, Geologic map of the Mount Harvard quadrangle, Chaffee and Gunnison Counties, Colorado: U.S. Geological Survey Geologic Quadrangle Map GQ-952, scale 1:62,500. Buddington, A.F., 1959, Granite emplacement with special reference to North America: Geological Society of America Bulletin, v. 70, p. 671-748. Chapin, C.E., 1971, The Rio Grande rift; Part I, Modifications and additions: New Mexico Geological Society Guidebook 22, p. 191-201. Chapin, C.E., 1979, Evolution of the Rio Grande rift; A summary, in Riecker, R.E., ed., Rio Grande rift; Tectonics and magmatism: Washington D.C., American Geophysical Union, p. 1-5. Chapin, C.E., 1988, Axial basins of the northern and central Rio Grande rift, in Sloss, L.L., ed., Sedimentary cover- North American craton U.S.: Geological Society of America, The Geology of North America, v. D-2, p. 165-170. Chapin, C.E., and Cather, S.M., 1994, Tectonic setting of the axial basins of the northern and central Rio Grande rift, in Keller, G.R., and Cather, S.M., eds., Basins of the Rio Grande rift; structure, stratigraphy, and tectonic setting: Geological Society of America Special Paper 291, p. 5-25. Chapin, C.E., and Lowell, G.R., 1979, Primary and secondary flow structures in ash-flow tuffs of the Gribbles Run paleovalley, central Colorado, in Chapin, C.E. and Elston, W.E., eds., Ash-flow tuffs: Geological Society of America Special Paper 180, p. 137-154. Clough, C.T., Maufe, H.B., and Bailey, E.B., 1909, The cauldron subsidence of Glen Coe, and the associated igneous phenomena: Quarterly Journal Geological Society of London, v. 65, p. 611-678. Colorado Division of Water Resources, 2006, Water well data. Coney, P.J., 1976, Plate tectonics and the Laramide orogeny: New Mexico Geological Society Special Publication 6, p. 5-10. Coolbaugh, M.F., 1985, Geology and economic mineral potential of upper Browns Creek 205
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
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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
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stream-channel deposits of all pere
Page 49 and 50:
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
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elated to the inferred Squaw Creek
Page 65 and 66:
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
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
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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
Page 153 and 154: elated to rotation of domain blocks
Page 155 and 156: 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: water near Maysville is being produ
Page 207 and 208: University, M.Sc. thesis, 50 p. Din
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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