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Preliminary Precambrian Basement Map of Wyoming Showing Geologic-Geophysical Domains Over Magnetics

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Preliminary Precambrian Basement Map of Wyoming Showing Geologic-Geophysical Domains Over Magnetics Sims P.K., C.A. Finn and V.L. Rystrom Open-File Report 01-199 PLATE 2 Preliminary Precambrian basement map of Wyoming showing geologic-geophysical domains over magnetics o o o o o o o o -104 -111 -105 -110 -108 -109 -107 -106 o 45 INDEX MAP (Modified from Reed, 1993) BEARTOOTH MOUNTAINS Wg Madison O WUgn Wg Mylonite Zone 105 Beartooth N Agn N E Mountains Agn G O Ag DSO R Powder U Bighorn O River H WYOMMountains Basin Black I Wg NG Hills Ag Teton Uplift TERTIARY - QUATERNARY DOMAIN Ag Mtns C B RAT E ON A R DOMAIN C VOLCANIC FIELD as - T A pe O r t c S O BIGHORN MOUNTAINS h r f IC W i TH AT l M N - p BIG MAG in HOR u N d le R l i i WUgn v v TRA e L t Ag r a r M Granite ra a O m H t Mtns O 42 n ie D s M t n s Sierra ORA N L E Madre O o C G Agn WYOMING O 44 Cheyenne belt R SS EI O GN 109 O BIGHORN WUgn Agn Agn ARCHEAN CRATON (WYOMING PROVINCE) O WL CR EEK MAGMATIC DOMAI Agn Ag N MESOPROTEROZOIC Wg Ys - Sherman Granite (age 1,415 - 1,435 Ma) -- In Laramie W WUgn IND and Medicine Bow Mountains IN Ya - Laramie Anorthosite Complex (Age 1,435 Ma) -- Includes Ag MA RIV WVsv O ER D anorthosite and pyroxene and hornblende syenite. In G Wg NEISS Laramie Mountains DOM Agn AIN EXPLANATION Yr - Unidentified rocks of units Ys and Ya Mapped from WIND Correlation of Map Units aeromagnetic map of Wyoming Outcrop Areas Covered Areas o WUgn ATIC 43 MAGM PALEOPROTEROZOIC io Wyoming Archean Craton Ag t a Meso- f m Ys Xh - Haystack Range Granite (Age 1,720 Ma) -- In Hartville uplift o r Yr Proterozoic Ya o Ag N Xs - Metasedimentary rocks on craton margin -- In Medicine Bow ef g E in and Sierra Madre Mountains; in covered areas, included Agn n d k Paleo- Xh RIVER RANGE r o G s Proterozoic Xs in unit Agn Ag wo O ud e T Approximate R r -H L s thermal front of O Wg Ag LATE ARCHEAN WIND RIVER n Late f U Agn a WVsv o r 1.8-1.4 Ga deformations A Archean T WUgn N WUgn Agn F O Wg - Intrusive igneous rocks, mainly granite-granodiorite (range t i e Wg h Ag S WVsv m t Trans-Hudson Orogen in age from 2,900 to 2,550 Ma) Wg i l D y WVsv - Metasedimentary and metavolcanic rocks -- Amphibolite, b U Paleo- Xt e Proterozoic hornblende gneiss, biotite gneiss, quartzite, iron-formation, LARAMIE Wg metaconglomerate, pelite schist, and marble; older than mat E S-H WVsv i cks x o L r N Colorado Orogen Wg Xt 2,875 Ma in Teton Range; older than 3,200 Ma in Granite ro L I LA p RAM p WUgn N Mountains; older than 2,600 Ma in Medicine Bow and IE K V MAGMATIC A an DOMAIN I Meso- Ys e A T Yr A TRA Sierra Madre Mountains. E Proterozoic Ya R P rch E M Xh WUgn - Gneiss and migmatite (Age 3,100 to 2,600 Ma) N A T A O L O H Ag - Unidentified granitic rocks mapped from aeromagnetic data Z D BE Xg Ag IE Paleo- Ag M R Xm Xr Agn - Unidentified gneiss mapped from aeromagnetic data; Approx A A Proterozoic imate Wg AR E Xsv L H includes subordinate rocks of unit Wvsv Agn limit S o of re ocks Contact, dashed where approximately located working of Archean r tion WUgn E TRANS-HUDSON OROGEN 42 rma N efo High-angle fault - Bar and ball on down-thrown side by C d N Xt-Unidentified rocks heyenne belt E ISS Y N Thrust fault - Sawteeth on upper plate; E MOUNTAINS E E GN WVsv H C dashed where inferred COLORADO OROGEN (COLORADO PROVINCE) ROG Ag High-angle fault - Relative movement not known LARAMIE O Wg Ag MESOPROTEROZOIC (1,600-900 Ma) Approximate thermal front (1.8-1.4 Ga) S Ductile shear zone Ys - Sherman Granite -- In Laramie and Medicine Bow Mountains Agn AIN Xr S Agn M Ya Ys Ya - Laramie Anorthosite Complex -- In Laramie Mountains DO Wg All faults: black, where previously known, green, Yr - Unidentified rocks of units Ys and Ya mapped from determined by this study. n aeromagnetic data ISS i EASTERN EDGE OF (SEVIER) OVERTHRUST BELT E a LT Strike-slip fault GN E m B O PALEOPROTEROZOIC (2,500-1,600 Ma) Agn Agn N D GI A W AR R Do BO MEDICINE M O c Principal sources of data: Blackstone, 1989 (Precambrian basement BOW MOUNTAINS ti Xg - Granitic rocks of 1,700 Ma age group -- In Medicine Bow OL map of Wyoming); Kucks and Hill, 2000 (Aeromagnetic map of Xs C a Mountains and Sierra Madre E Xr Wyoming); Love and Christiansen, 1985 (Geologic map of Wyoming) N Wg gm Xm - Mafic intrusive rocks (Age ~1,760 Ma) -- In Medicine Bow DICI SIERRA a ME Mountains, Laramie Mountains and Sierra Madre M Ag N MADRE Ys Xsv - Metasedimentary and metavolcanic rocks -- Formed in a TO Yr Ys Agn RA volcanic arc environment (Age 1,800-1,700 Ma) C E Xs WUgn Xm Ga NN Xm 4 E . Xr - Unidentified rocks of units Xg, Xm, and Xsv mapped from o Y E Xm 1 H Xg aeromagnetic data 41 Agn C Xr Xsv Xsv Ys Ys 0 10 20 30 40 50 Miles 0 10 20 30 40 50 Kilometers.
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