Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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237 392436 4265641 155 Adit; Geochem Xbfg;Xa;QV;CuOx Vuggy Quartz Veins with Chalcopyrite; geochem compos 237A 392649 4265301 57 Adit; Geochem Xbfg;QV;Mag Caved Adit on Hairpin/Switchback; geochem compos 237F 392589 4265297 Prospect YXp 238 392536 4265221 Shaft; Geochem Xmfs;Xhig;YXp;QV Gossan; QV w/ CuOx and Tr Gal(); geochem compos 238A 392524 4265255 159 Adit Xbfg;YXp 238B 392563 4265171 Prospect Xhig 238C 392604 4265095 Prospect Xhig 238D 392701 4265035 Prospect YXp 238E 392687 4265018 Prospect YXp;VQ 238F 392684 4265001 Prospect YXp;VQ YXp in Xbfg 239 392703 4264930 Prospect Xbfg;QV 245A 393571 4265406 Prospect Xag;Xcs;Xbfg Abundant Chl and Ep 245B 393628 4265424 Prospect Xag 247 393431 4265814 45 Adit YXp-CuOx-Xhig 258 393329 4273526 WR Chem Tqlp quartz latite porphyry hybrid dike; whole rock analysis 264A 391985 4273916 334 60 Vein Qtz-Ser-Pyr VE in Xgdf 265 392136 4274206 Pros; Geochem Xag;Xcs;Xhig;CuOx Cluster 8 Prospects; Gar-Cpx-Ep-Mag calc-silicate; geoch 266 392069 4274245 95 Adit Xag;Xcs;FeOx 266A 392154 4274269 Prospect Xag;Xcs 267D 392134 4274370 Prospect YXp;Xgdf 269A 392781 4274832 Prospect YXp;Xgdf 278 394591 4272626 290 Adit Qc Blank Mine Adit(Caved) w/ Spring 279 394600 4272892 300 Adit Xag;Xhig 280 394410 4272693 Shaft; Geochem Fault Breccia;Xag;Xhig;Or() Blank Mine Shaft;Pyr and Gal in Or(); geochem 281 394383 4272720 320 Adit Fault Breccia;YXgp;Xhig;Xag +20 Ft Thick Colluvium 282 394351 4272787 330 Adit YXgp;Xhig Some Brecciated and Silicified YXgp 282E 394414 4272815 317 Adit YXgp;Xag;Xhig 283 394450 4272827 317 Adit BR;Xhig;YXgp 283A 394438 4272800 Prospect Yxgp 283B 394506 4272834 280 Adit GR;Xag;Xhig Tr QV 285 394526 4272668 Drill Hole Xag;Xhig RC Drill Site;Road Cut Bank w/ 3 to 5 Ft of Colluvium 286 394522 4272586 Drill Hole Cuttings are sandy with chips of YXgp 288 394496 4272501 Drill Hole Sandy Cuttings 291 394357 4272346 Drill Hole RC Drill Site 293 395517 4272639 Prospect Qc +15 Ft of Sandy Colluvium Exposed in Pit 307A 394232 4264625 Prospect Xag;Xcs;Yxgp Gar-Ep calc-silicate 314 394498 4263780 Prospect Xmfs 334A 396351 4274951 Prospect Tr;Tr Crackle Breccia;QV Trace Rounded Td Clasts:Tma and Badger Cr Tuff 334B 396326 4274937 Prospect Trp;QV 335 396288 4274952 Shaft; Geochem Xgdf;Yxgp Silicified breccia Shavano range front fault; geochem 223
336A 396189 4274961 Prospect Xgdf Broken Xgdf w/ BR Character 336B 396069 4274989 Prospect Xgdf Mylonitic Xgdf;M-S Chl 343A 396983 4275597 285 Adit BR/GR;Xgdf;QV 344 397005 4275643 Shaft Fault Breccia;Xgdf;QV 345 397080 4275609 Prospect Fault Breccia;Xgdf;Trp 4 Ft Deep Prospect and Smaller pits on 150 Trend 346 397135 4275583 Shaft Fault Breccia;Trp 346os 45 Fault Fault Breccia;Trp/Tr 50 Ft Long Rib Silicified Fault Breccia 346A 397109 4275554 335 Adit Fault Breccia;Trp/Tr 346B 397275 4275520 Prospect Qc();Xgdf;YXgp;Fault Breccia 354 397245 4276007 Prospect Xgdf Silicified Xgdf 356 397154 4275953 Prospect Xag;Xgdf 2 Prospect Pits w/ Silicified Slips 359 397095 4275748 Prospect GR/BR;Xag;Xgdf 441B 393318 4270544 Prospect Xgp 447A 392173 4270923 Age Det. Tqm Age determination sample 486C 401877 4271485 Placer Cut Qk;Td Placer Cuts 487 401835 4271430 Placer Cut Qk;Td 488 401736 4271443 Placer Cut Qk;Td 488A 401708 4271430 Placer Cut Qk;Td 488Bos Placer Cut Qk;Td 488C 401704 4271461 Placer Cut Qk;Td Qk w/ Xgd Blocks to 5 Ft 488D 401816 4271495 Placer Cut Qk;Td Top of Large Placer Cut;Qk w/ imbricate Clasts;Fe-Mn 495B 395872 4274377 Prospect Xgdf 495C 395879 4274384 Prospect Xgdf;QV 504 394053 4275539 WR Chem Tmpp Mount Pomeroy subunit; whole rock analysis 516os 143 79 Vein QV Chalcedonic QV in Tcm 540os 194 28 Vein 1-3 mm thick QV in Trp Dike 542 393081 4272971 WR Chem Trp Alkali rhyolite porphyry dike; whole rock analysis 564os 262 81 Vein QV 4 In Thick QV Cutting Xig 575A 392177 4271791 WR Chem Tnfg Alkali granite w/ Tr Red Garnet; whole rock analysis 575Aos 60 51 Vein QV 2 to 3 mm Thick QV w/ Trace Pyrite Cutting Tnfg 601 396301 4265404 Shaft Xhig;QV;CuOx Open Shaft;'+40Ft Deep 601osb 275 86 Vein QV;Mag;YXp;CuOx Qtz-Mag-CuOx;Probably was Chpy 608 396645 4264970 223 Adit Or() Trace Silicified Material;Mostly Chert and Brecciated Chert 609 396724 4264927 188 Adit Or() Some Brecciated Silicified Material;Carbonate Breccia 614A 396562 4264842 Prospect Td-Or() Sm Prospect Pit on Contact 622 395768 4265177 272 48 Prospect Xmfs;YXgp Sillimanite in Xmfs;Black Tourmaline in YXp 630D 395769 4265633 Prospect YXgp 631 395783 4265654 200 Adit; Geochem Xhig;YXgp;MAG;CuOx CuOx mostly in Xig; some in YXp; geochem 631A 395761 4265678 227 Prospect;Cut Xhig;YXgp 631B 395780 4265693 230 Prospect;Cut YXgp 224
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
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
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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
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sometimes terminate at a cross stru
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limestone that is exposed in a wind
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quadrangle are intimately associate
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of the quadrangle. The north-northw
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quartz monzonite ring dikes (Tma).
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that truncates the Upper Arkansas g
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as at the mouth of Squaw Creek. How
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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 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: 94A 391996 4263422 Prospect YXp;Xbf
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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