Geologic map of the Topock 7.5’ quadrangle, Arizona and California
The Topock quadrangle exposes a structurally complex part of the Colorado River extensional corridor and also exposes deposits that record landscape…
Public-domain full text preserved in the Mountain Man Mining Library. Original source: pubs.usgs.gov.
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QTa1s Trbfu Qc Tv Xg Ts Qa3 Tb Tp Tf Tb Tbl " " " " " " " " " " " " " " " " " " F " " " F " " " " " F " " F F " " " " " F " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " F " " " F F F F " F F " " " " " " " " F F F " " " " " F F 114°22'30" 114°30' 34°37'30" 34°45' 34°37'30" 34°45' 114°22'30" 114°30' Figure 2. Map showing Topock quadrangle geology and major structures draped over hillshade derived from 30-meter digital elevation model. Devil's Elbow Fault (DEF). POWELL PEAK FAULT PULPIT ROCK FAULT GOLD DOME FAULT ZONE TUMARION PEAK FAULT T U A F T N E M H A T E D MOHAVE WASH FAULT MOHAVE WASH FAULT MOHAVE WASH FAULT CHEMEHUEVI CHEMEHUEVI DEF DEF DEF DETACHMENT POWELL PEAK PLUTON BORROW PIT BODY NEEDLE MTN INTRUSION Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, 1-888-ASK-USGS Digital files available at ://pubs.usgs.gov/sim/3236/ Suggested citation: Howard, K.A., John, B.E., Nielson, J.E., Miller, J.M.G., and Wooden, J.L., 2013, Geologic map of the Topock 7.5' quadrangle, Arizona and California: U.S. Geological Survey Scientific Investigations Map 3236, pamphlet 60 p., scale 1:24,000 [://pubs.usgs.gov/sim/3236/]. 114°22'30" 25' 27'30" R. 24 W. R. 20½ W. 114°30' 34°37'30" 40' 34°45' T. 16 N. T. 7 N. 42'30" 34°37'30" 40' 42'30" 34°45' 114°22'30" 25' 27'30" 114°30' T. 16 N. T. 15 N. R. 20½ W. R. 20½ W. R. 21 W. R. 20 W. 1 U.S. Geological Survey 2 Department of Geology and Geophysics, University of Wyoming 3 Department of Geology, Vanderbilt University 4 Environmental Sciences, Stanford University Geologic Map of the Topock 7.5' Quadrangle, Arizona and California By Keith A. Howard 1, Barbara E. John 1, 2, Jane E. Nielson 1, Julia M.G. Miller 3, and Joseph L. Wooden METERS sea level B B' FEET 1,000 -1,000 -2,000 -3,000 sea level
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Footwall of Chemehuevi Core Complex CHEMEHUEVI DETACHMENT FAULT MOHAVE WASH FAULT GOLD DOME FAULT ZONE TUMARION PEAK FAULT POWELL PEAK PLUTON POWELL PEAK FAULT Section A-A' TUMARION BLOCK
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Tp Qs A´ A Base from U.S. Geological Survey, 1970 Polyconic projection; 1927 North American Datum Geology mapped by B.E. John (1981-1987, 1990-1996); K.A. Howard (1980-1981, 1989-1990, 2006-2008); J.E. Nielson (1981-1982, 1990); J.M.G. Miller (1992-1996); assisted by V.L. Hansen (1981), M. Pernokas (1980), L. Glick (1982), and Linda Thorburn (1992) GIS database and digital cartography by S.S. Priest Manuscript approved for publication October 3, 2012 CALIF. MAP LOCATION ARIZ. NEV. 7000 FEET 1 KILOMETER SCALE 1:24 000 CONTOUR INTERVAL 40 FEET DOTTED LINES REPRESENT 20-FOOT CONTOURS 1/2 1 MILE APPROXIMATE MEAN DECLINATION, 2012 11¾° TKl Yd Tdm TYd Tcd TKcd Tdl Tdm TKq TKq Xgp Yd TYd Tcd TKcd Tdl Tkl Yd Tdm TKcd M ? " F F ? o o s v ¨ ¹ ½ ³ T ÷ ds d af Ql Qs Qa3 Qa2 Qa4 Tmg
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Trbfu Tao Qca Qcs Qcgy Qcr Qcm Qtp Qc Qtg Qf LIST OF MAP UNITS SEDIMENTARY AND VOLCANIC ROCKS AND DEPOSITS Artificial fill (Holocene, Anthropocene) Disturbed ground (Holocene, Anthropocene) Dredged sand (Holocene, Anthropocene) Piedmont alluvium Youngest piedmont alluvium (Holocene, Anthropocene) Younger piedmont alluvium (Holocene) Intermediate-age piedmont alluvium (Pleistocene) Floodplain and deltaic deposits (Holocene, Anthropocene) Windblown sand (Holocene) Landslide block (Holocene) Colorado River-related deposits Terrace gravel and sand (Upper Pleistocene) Pink silty sand Chemehuevi Formation (Upper Pleistocene) Sand Mud Gypsiferous mud Angular gravel Deposits of old railway grade Old piedmont alluvial deposits Older piedmont alluvium (Pleistocene and Pliocene) Deposits of ancestral Sacramento Wash Cemented old piedmont alluvium, undivided (Pliocene and Miocene(?)) Ancestral Colorado River deposits Colorado River gravel, undivided (Pleistocene and (or) Pliocene) Boulder conglomerate of Bat Cave Wash (upper Pliocene(?)) Facies of Santa Fe Railway (Pliocene) Upper conglomerate Middle part Lower claystone and sandstone Sandstone and conglomerate (lower Piocene) Bouse Formation (lower Pliocene) Basal limestone Fanglomerate (upper Miocene) ROCKS DEPOSITED DURING EXTENSIONAL DEFORMATION Upper sedimentary and volcanic sequence (middle Miocene) Conglomerate Gneiss-clast conglomerate Volcanic-clast conglomerate Sedimentary breccia Megabreccia Granite-clast megabreccia Gneiss-clast megabreccia Tuff-clast megabreccia Sedimentary rock and tuff Higher basalt flows Peach Spring Tuff (early Miocene) Sedimentary rocks (lower Miocene) Lower volcanic sequence (early Miocene) Basalt flows Basalt, tuff, and conglomerate Tuff Volcanic and intrusive rocks Tuff and sedimentary rocks Lava flows Arkose and conglomerate (lower Miocene) INTRUSIVE AND METAMORPHIC ROCKS Hypabyssal intrusions (Miocene) Mafic intrusive rocks (Miocene) Light-colored dikes (Miocene) Mafic dikes (Miocene) Dike swarm of Chemehuevi Mountains Northwest-striking dikes (Miocene) Northeast-striking dikes (Tertiary or Late Cretaceous) Lamprophyre dikes (Tertiary or Late Cretaceous) Quartz porphyry (Tertiary or Late Cretaceous) Fine-grained granite (Tertiary or Late Cretaceous) Dark dikes, undivided (Tertiary to Proterozoic) Whale Mountain sequence of John (1987b) Quartz monzonite (Miocene and Cretaceous(?)) Chemehuevi Mountains Plutonic Suite (Late Cretaceous) Chemehuevi Peak Granodiorite Biotite granodiorite Porphyritic hornblende-biotite granodiorite Hornblende-biotite granodiorite Diorite (Late Cretaceous) Diorite of Topock (Cretaceous(?)) Granite (Cretaceous or Mesoproterozoic) Quartz monzodiorite (Cretaceous or Mesoproterozoic) Diabase (Mesoproterozoic) Granite (Mesoproterozoic) Mylonitic gneiss and migmatite (Paleoproterozoic protolith) Augen gneiss (Paleoproterozoic) Gneiss (Paleoproterozoic) Pegmatite and granite gneiss Leucocratic gneiss Amphibolite Mixed granite gneiss and metasedimentary rocks Contact—Dashed where approximate Faults—Dashed where inferred; dotted where concealed (arrows show relative separation in cross sections) Fault—Showing dip where known; bar and ball on downthrown side Fault, low-angle normal—Rectangle on downthrown side Folds—Showing trace of axial surface and direction of plunge Anticline Syncline Dike—Showing dip where known. Color correlates to geologic map unit Fluvial scarp—Hachures point downscarp Strike and dip of beds and volcanic layers Inclined—Showing dip Inclined—Dip amount unknown Overturned Vertical Foliation Magmatic (including welding compaction) Inclined Vertical Metamorphic Inclined Vertical Mylonitic Lineation, mylonitic Slickenlines Tc Ts Tac Tv Tvi Tvb
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