Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

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OPEN-FILE REPORT 06-10 Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado APPENDIX APPENDIX 1. MAYSVILLE QUADRANGLE POINT-FILE DATABASE WITH LOCATION AND STRUCTURE DATA. Datum NAD27 CONUS ZONE 13 ID UTM E UTM N STRIKE DIP TYPE FORMATION COMMENT 3 395788 4262814 WR Chem Ta Tertiary () andesite hybrid dike; whole rock chemistry 4 395684 4262799 275 Adit; Geochem Xmsg;Xcs Calc-silicate w/ Sph and Chpy; geochem 5 395635 4263036 Shaft Xag;Xbfg;Xcs;CuOx;Mag 6 395641 4262959 224 Adit Xbfg;Xcs;Mag 6A 395629 4262931 Prospect Xcs;CuOx;Ta 7 395633 4262915 Shaft Xmsg;Xag;Xcs;YXp;Ta;Mag;CuOx 7A 395632 4262904 Prospect Xcs;CuOx;Mag;Ta Small prospect at base of 05-7 shaft dump 8 395529 4262884 Prospect YXp; Xbfg 8A 395445 4262842 Prospect YXp 11 395037 4262698 Prospect YXp;Xmsg 12 394827 4262598 Prospect YXp;Xmsg;Ep 15B 394207 4262301 Prospect YXp;Xa;Xcs 32 395761 4263049 245 Adit; Geochem Xbfg;Xa;Xcs;Mag-Chpy;QV Bon Ton NE Adit; calc-silicate w/ sph, gah, chpy; geochem 34 395945 4263262 Cat Cut YXp;Xag 40 396533 4263447 Prospect Td2 63 395791 4263435 Cat Cut YXp 64 395558 4263405 Cat Cut YXp Control Point;Old Claim Post 65 395822 4262849 Cat Cut YXp;Xag 65B 395840 4262834 Prospect Xag;Xcs Soil Grid in this area: 992+00N;1006+00E 66 395658 4262834 32 Adit Xcs Bio-Gar-Cpx-Act-Chl calc-silicate with Chpy 66A 395653 4262806 Prospects Xag;Xcs Xcs with CuOx 67 395656 4262870 Shaft Xag;Xcs Gar-Cpx-Bio calc-silicate with disseminated Chpy 67A 395641 4262875 Prospect Xag;Xcs Hbde-Act-Bio-Gar calc-silicate with CuOx 68 395549 4262983 Cat Cut YXp Top of Cat Cut 68A 395580 4263002 Cat Cut YXp Bottom of Cat Cut 78 391298 4263007 Adit; Geochem Xag;Xcs;YXgp;CuOx Cat Cut through area of old adit; calc-silicate w/ Cu; geochem 78A 391299 4263069 207 Adit Xaa;Xcs;CuOx Control Point 90A 391703 4263170 Prospect Xmfs 220
94A 391996 4263422 Prospect YXp;Xbfg 106 391647 4263962 84 Adit BR(Xbfg) 106A 391634 4263994 96 Adit; Geochem Xmfs;Xag;Xcs;YXp Como Cr; calc-silicate w/ Cu-Zn; geochem composite w/ 106B 106B 391575 4263957 82 Adit; Geochem Xbfg;Xag;QV Como Cr; calc-silicate w/ Cu-Zn; geochem composite w/ 106A 106C 391634 4263952 Prospect Xbfg 106D 391615 4263995 107 Adit Xmfs;Yxgp 106E 391656 4264003 Prospect Xag;Xcs-CuOx 106F 391692 4263968 110 Adit Xbfg;Xmfs;Xag 109 392014 4263802 Prospect YXp YXp in Xmfs 113 392034 4263739 135 16 Foliation Xaa;Xhig Xag/Xhig is biotitized() 113os 352 90 Vein_vert Ep 116 393456 4264042 Prospect YXp;Xmfs Control Point 117 393636 4264091 Prospect YXgp 117Aos 45 Vein Quartz Vein cuts Xmfs 118A 394076 4264100 Prospect Xag 122 394432 4264141 Prospect Xcs;Xag 123 394629 4264037 Prospect Xag;Xcs-Ep;QV 124 394729 4263987 Prospect Xag;QV 124A 394154 4264132 Prospect YXp 157C 395187 4263968 Shaft Hematite Breccia;QV;YXp 157D 395204 4263956 50 Cat Trench YXp Old Claim Post 158 394837 4263813 Prospect VQ Vein;Xbfg;Xag;YXp 158os 42 87 Vein/Fault Vuggy Quartz Vein Breccia;Gossan 159B 394809 4263520 Prospect Xag;QV-Gossan 176A 396752 4262460 Prospect Td2 FeOx in Xag blocks 183A 395625 4262222 Pros; Geochem Xhig Quartz vein w/ chpy and amphibole; geochem 183Aos 9 62 Vein/Foliation QV;Xhig Qtz-Chpy VE w/ assoc Chl and Ep 192 395540 4262272 160 Adit Xhig 203 395891 4264554 Prospect YXp;Xhig;BR BR Fault in contact zone w/ Td 205A 395851 4264846 Prospect YXp;QTZ;Xmfs Pegmatite-Quartz Vein w/ RHD and CAL 207A 395280 4264929 Prospect YXp;QTZ;CuOx Also Xq and Xhig on Dump 207B 395264 4264950 Prospect Xhig;Xcs;QTZ;Hem Xcs w/ Ep and Gar 207D 395329 4264948 Prospect Ta Dike At Contact Ta-Xmfs 208 395238 4264738 Prospect YXp;Ta 213B 394733 4264020 Prospect Xhig 214 394960 4264093 Prospect Xcs Xcs w/ Ep;Gar;Act 214C 395338 4264204 Prospect Xhfg Silicous Hornfels 215 395442 4264204 Prospect YXp-CuOx 3 ft thick Qtz-Peg in Xig;Xhf;Xag 229 391862 4265593 Prospect YXgp YXgp in Xag;Xmfs 230 391780 4265758 Prospect Xhig Gossan Horizon 221
Page 1 and 2:
OPEN-FILE REPORT 06-10 Geologic Map
Page 3 and 4:
TABLE OF CONTENTS Introduction…
Page 5 and 6:
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
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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
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 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: quadrangle, Colorado: U.S. Geologic
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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