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GEOLOGIC CROSS SECTIONS SPANNING the LA BAJADA CONSTRICTION and NORTHERN CERRILLOS UPLIFT, NEW MEXICO by -1,500 -1,500 David A

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GEOLOGIC CROSS SECTIONS SPANNING the LA BAJADA CONSTRICTION and NORTHERN CERRILLOS UPLIFT, NEW MEXICO by -1,500 -1,500 David A U.S. DEPARTMENT OF THE INTERIOR PROFESSIONAL PAPER 1720 U.S. GEOLOGICAL SURVEY PLATE 6 Cañada 7.5' Quadrangle Cochiti Dam 7.5' Quadrangle Cochiti Dam 7.5' Quadrangle Montoso Peak 7.5' Quadrangle Tetilla Peak 7.5' Quadrangle Montoso Peak 7.5' Quadrangle LIST OF MAP UNITS Tmh Hornblende monzonite porphyry (Oligocene and Eocene) A A' E E' Qcc Basaltic andesite of Cochiti Cone (early Pleistocene) Tg Galisteo Formation (Eocene) METERS METERS METERS METERS Bandelier Tuff (early Pleistocene) Km Mancos Shale, undivided (Late Cretaceous) E–E' F–F'' F–F' C–C' B–B' D–D' A–A' SECTION SECTION 2,200 2,200 2,200 2,200 SECTION SECTION SECTION SECTION SECTION Tcp Qbt Tshirege Member c Mesozoic sedimentary rocks, undivided CAJA DEL RIO Tcp MT–10 Tcmu PLATEAU Ta CAJA DEL RIO PLATEAU Qbo Otowi Member Jm Morrison Formation, undivided (Late Jurassic) 2,100 2,100 1,200-FT WELL COCHITI GRABEN RESERVOIR HORST LA MAJADA GRABEN Tcm 2,100 MT–8 AMT–5 2,100 COCHITI Tcc QTt Tuerto Gravel and Ancha Formation, undivided (middle Pleistocene Jd Jurassic and Triassic sedimentary rocks, undivided CONE MT–11 Tcc CAMADA FAULT CAMADA FAULT PAJARITO COCHITI CONE FAULT COCHITI CONE FAULT to Pliocene) 2,000 FAULT ZONE 2,000 2,000 2,000 JdP Jurassic, Triassic, and Permian sedimentary rocks, undivided Qbt LA BAJADA FAULT ZONE Qcc Tae Tbs QTs Eastern piedmont facies of uppermost Santa Fe Group (middle QTc SOUTH PAJARITO CAÑADA DE SANTA FE AMT–4 Pleistocene to late Pliocene(?)) Trb QTc FAULT ZONE Tbr 1000 P Permian sedimentary rocks, undivided 1,900 Tbp 1,900 800-FT WELL 100 Tbu Tbu? 1,900 Tbu 1,900 QTc Cochiti Formation (early Pleistocene to late Miocene) Tbp Tbj 100 100 1000 hpe Pennsylvanian sedimentary rocks and Precambrian rocks, undivided QTt 300 Tbp Qbo Qbt Tb QTl Clay-rich lacustrine(?) deposits (early Pleistocene to Pliocene) 1,800 1,800 Qbo 1,800 Tg 10 1,800 Trb DOME ROAD WELL Qbo Tbu MT-17 COCHITI FAULT Km QTsp?/Te 10 100 QTbc Basalt of Cochiti (early Pleistocene to late Pliocene) QTc QTbc QTsa ? Te 10 Qcc 1,700 SANCHEZ FAULT QTsp? 1,700 Sierra Ladrones Formation Tb Rio Grande 1,700 1,700 Tb QTsp? 20 QTsa Axial river gravel facies (early Pleistocene to late Miocene) 2 2 QTsp/Te Stratigraphic interval in which unit QTsp cannot be distinguished 1,600 1,600 1,600 1,600 Tku QTsp Eastern piedmont facies (early Pleistocene to late Miocene) from unit Te on the basis of magnetotelluric soundings and ? Tku? Tku? ? geologic constraints (either one or both units may be present in Tku? 1,500 1,500 Tsls Axial river sand (Pliocene) 1,500 1,500 the interval) Tku? ? ? 2 QTc Tslm Lacustrine clay, silt, and sand (Pliocene) 50 ? ? Km 1,400 QTsa 1,400 QTc 1,400 QTsp? 1,400 Tglp Gravel of Lookout Park (late Pliocene) Contact—Queried where uncertain 20 Ta Late andesite of Caja del Rio (Pliocene) 1,300 1,300 Tku? 1,300 1,300 Tbu Cerros del Rio basalts, undivided (Pliocene) Fault—Arrows show relative motion. Queried where uncertain ? 10 1,200 1,200 1,200 1,200 Late basalt of Arroyo Calabasas VERTICAL EXAGGERATION X 5 Form line indicating bedding or lava flow foliation 3949500n (605 E–W TEM Profile) Tby Upper lava flows (Pliocene) 1,100 1,100 Tbx Lower lava flows (Pliocene) 5 5 Water table—Constrained by water-level data discussed in chapter G Tcmu Late andesite of Cerro Micho (Pliocene) (this volume) and shown in figure G1. Queried where uncertain 1,000 10 QTsp?/Te 1,000 ? Tcp Andesite of Cerro Potrillo (Pliocene) 900 900 Tbr Basalt of Caja del Rio (Pliocene) AMT-2 Magnetotelluric sounding projected into plane of cross 30 section—Horizontal tics represent changes in resistivity derived from 5 Tcm Basaltic andesite of Cerro Micho (Pliocene) 5 10 two-dimensional resistivity model (see ch. F, this volume); numbers 800 800 Tbm Basaltic hydromagmatic deposits (Pliocene) 30 indicate resistivity values (in ohm-m) of vertical intervals in modeled section; solid circles indicate base of modeled section ? Tb Basalt of White Rock Canyon (Pliocene) 700 TETILLA(?) FAULT OR 700 FAULT ZONE Tbpc Basaltic andesite of Petroglyph Canyon (Pliocene) 10 600 600 Olivine basalt of Santa Ana Mesa (Pliocene) Cañada 7.5' Quadrangle Cochiti Dam 7.5' Quadrangle Cochiti Dam 7.5' Quadrangle Montoso Peak 7.5' Quadrangle Tbk2 Flow 2 500 500 B B' Tcc Andesite of Cerro Colorado (Pliocene) 30 E–E' F–F'' METERS METERS ? SECTION SECTION 400 400 Tbj Basalt of Mesita de Juana (Pliocene) 2,200 2,200 JdP JdP CAJA DEL RIO Tbb Basalt of La Bajada (Pliocene) PLATEAU CERRITO PELADO 300 300 2,100 2,100 Water well—In most instances, horizontal tics represent water levels or Projected along fault strike Tbs Basalt of Tsinat Mesa (Pliocene) COCHITI GRABEN RESERVOIR HORST LA MAJADA GRABEN Ta Tcc AMT-5 MT-11 Ta LB10–3 stratigraphic contacts determined from well logs (see ch. G, this Tby 100 Tbpb Basalt of Pena Blanca (Pliocene) volume); for the Santa Cruz Springs Tract well, tics indicate lithologic COCHITI CONE FAULT COCHITI CONE FAULT 200 200 2,000 Tglp Ta 2,000 Qcc Tbpc boundaries as described in chapter G Tglp Tbx Tku Bearhead Rhyolite and Paliza Canyon and Canovas Canyon LA BAJADA CAMADA FAULT CAMADA FAULT FAULT ZONE Formations, undivided (Miocene) 100 100 100 1,900 SOUTH PERALTA Tcc 1,900 QTc CANYON Tbu Tkvs Volcaniclastic sediments of Paliza Canyon Formation (Miocene) QTc 1000 Qbo Trb Bearhead Rhyolite (Miocene) 1,800 SOUTH PAJARITO 1,800 SEA LEVEL SEA LEVEL ? FAULT ZONE Qbo Tb? AMT-2 Qcc 100 Tbp Peralta Tuff Member ? COCHITI FAULT QTsa SANCHEZ FAULT Note: Lines of sections are shown on geologic map (pl. 2, this volume). Geologic 30 QTc -100 -100 1,700 Rio Grande 1,700 Santa Fe Group (Miocene and Oligocene) QTl Tb 20 interpretations shown in sections are constrained by mapped surface geology 10 10 Tb ? shown on plate 2, gravity and aeromagnetic data presented in chapter D, airborne ? Tsf Middle part Tbp 30 ? Trb ? QTsp? -200 -200 and ground electromagnetic data presented in chapter F, and geologic well data 1,600 1,600 Tab Abiquiu Formation(?) (Miocene and Oligocene(?)) presented in chapter G (all this volume). Surficial Quaternary deposits shown on QTc plate 2 are omitted in all these sections to emphasize the underlying geology. -300 -300 Tc Cieneguilla Basanite (Oligocene) 1,500 ? QTsa ? 1,500 1000 Subsurface depiction of pre-rift (Oligocene and older) geologic units along section Tku? ? 10 ? Te Espinaso Formation (Oligocene and Eocene) F–F'' are constrained largely by modeling of gravity and aeromagnetic data as ? 1000 described in chapter D (this volume) and as illustrated in figure D6. Most magneto- -400 h e -400 1,400 QTsp? 1,400 p hpe Tmi Monzonite and monzonite porphyry intrusive rocks (Oligocene and telluric soundings and water wells are projected short distances orthogonally into 2 hpe 1000 Eocene) planes of the sections. QTsa Km 1,300 Tku 30 1,300 -500 -500 QTsa VERTICAL EXAGGERATION X 5 Te 392400e (6007 and 6008 N–S TEM Profiles) 1,200 TETILLA(?) FAULT OR 1,200 FAULT ZONE 1,100 ? ? 1,100 1000 hpe 10 JdP 1,000 QTsp/Te 1,000 h e ? p 1000 900 900 ? JdP 800 800 VERTICAL EXAGGERATION X 5 5 3945800n (614 E–W TEM Profile) ? Outside of plate 2 map area. Geology based on mapping of Maynard and others (2001) and Maynard and Lisenbee (2002) F F' F'' E–E' B–B' C–C' METERS A–A' D–D' METERS SECTION SECTION SECTION SECTION SECTION 2,500 2,500 2,400 2,400 COCHITI GRABEN RESERVOIR HORST LA MAJADA GRABEN Santo Domingo Pueblo SW 7.5' Quadrangle Santo Domingo Pueblo 7.5' Quadrangle Santo Domingo Pueblo 7.5' Quadrangle Tetilla Peak 7.5' Quadrangle 2,300 2,300 C C' SAINT PETERS METERS METERS DOME BLOCK 2,200 2,200 E–E' 2,000 F–F'' 2,000 SECTION SECTION CAÑON SANTO DOMINGO COCHITI GRABEN RESERVOIR HORST LA MAJADA GRABEN CAJA DEL RIO PLATEAU TETILLA Qbt FAULT ZONE Tbs 2,100 Qbo 2,100 AMT–4 800-FT WELL Tbr 1,900 Tbb 1,900 Tc 300 ZONE FAULT PAJARITO LA BAJADA CONSTRICTION LA BAJADA 2,000 Tmh Tmi 2,000 BORREGO FAULT BORREGO FAULT CERRILLOS 1,800 QTc Qbo FAULT ZONE 1,800 CAÑADA DE Jm Tmh PERALTA FAULT FAULT PERALTA CAMADA FAULT SANTA FE UPLIFT Te Tglp 10 QTsp/Te QTc TETILLA Tg Km c QTc QTsp? 1,900 Tku FAULT ZONE Tbj 1,900 Cochiti-TW Tbb Te 1,700 SILE FAULT 1,700 Qbo SANCHEZ FAULT SANCHEZ FAULT AMT–3 QTsp Santa Cruz Springs well Tract QTsa QTsa Tg DOME ROAD WELL QTsp Te MT-17 QTt 3-TW Tbpb 30 100 Rio Grande 1,800 QTsp Te 1,800 CEPO-1 QTsa 1,600 1,600 COCHITI FAULT LA BAJADA AMT-2 10 QTc FAULT ZONE QTc QTsa CRUZ SPRINGS TRACT WELL SANTA Tab 1,700 30 SANCHEZ FAULT AMT–3 1,700 1,500 1,500 Tb Rio Grande 30 Tg 100 Tmi? QTl Tbpb QTc 10 QTsp Tab 2 1,600 1,600 1,400 1,400 Tku Km Km Tsf 30 QTsa Tg Te? 1,500 1,500 1,300 QTc QTsa 1,300 QTsp Tbpb Tg? QTsp 1,400 100 Te 1,400 1,200 1,200 Tku QTsp QTsa? 1,300 50 1,300 1,100 10 1,100 Tg Tku QTsp? QTsp? Tsf 5 QTsp 2 1,200 Tg 1,200 1,000 JdP 1,000 Tsf Jd 1,100 10 1,100 900 900 VERTICAL EXAGGERATION X 5 3939250n (630 E–W TEM Profile) 1,000 1,000 c 2 900 900 Mz 800 800 Tg? 10 700 700 Tg? 600 600 P P 500 500 c Santo Domingo Pueblo SW 7.5' Quadrangle Santo Domingo Pueblo 7.5' Quadrangle Santo Domingo Pueblo 7.5' Quadrangle Tetilla Peak 7.5' Quadrangle 400 400 Tg? D D' 300 300 E–E' METERS F–F'' METERS SECTION SECTION CAJA DEL RIO PLATEAU 2,000 2,000 Tmi TETILLA SANTA ANA MESA LA MAJADA MESA FAULT ZONE 200 P 200 1,900 1,900 LB10–4 LB11–5 LB11–1 Tbj LB11–6 LB10–3 LB09–2 LB12–7 c Tbk2 QTsp 100 100 Tbj Te QTc 1,800 Tbm QTt 1,800 Tc Te BORREGO LA BAJADA SEA LEVEL SEA LEVEL FAULT ZONE FAULT ZONE ? QTsa CAMADA FAULT hpe 1,700 QTc QTs Tab 1,700 PERALTA FAULT PERALTA Tslm QTsp -100 -100 QTsa Tsls SILE FAULT SILE FAULT Tsls Tg Rio Grande SAN FRANCISCO FAULT 1,600 Qbo 1,600 QTc -200 -200 1,500 QTsa 1,500 -300 P -300 Km 1,400 1,400 QTsp? Tmi -400 -400 Tbpb Te P Tg 1,300 1,300 hpe -500 -500 QTsa QTsp 1,200 1,200 QTc? QTsa? 1,100 1,100 QTsp? 1,000 1,000 QTc? 2-10 900 900 VERTICAL EXAGGERATION X 5 3934000n (643 E–W TEM Profiles) hpe -1,000 -1,000 SCALE 1:50 000 1 1/ 2 0 1 2 3 4 MILES NEW MEXICO 1 .5 0 1 2 3 4 5 KILOMETERS MAP LOCATION 200 GEOLOGIC CROSS SECTIONS SPANNING THE LA BAJADA CONSTRICTION AND NORTHERN CERRILLOS UPLIFT, NEW MEXICO By -1,500 -1,500 David A.
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