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Geologic Map of the Becker SW 7.5-Minute Quadrangle, Socorro

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Geologic Map of the Becker SW 7.5-Minute Quadrangle, Socorro NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY NMBGMR Open-file Geologic Map 233 Last Modified August 2013 CORRELATION OF MAP UNITS Santa Fe Group 106°45'00"W 340000 341000 342000 42'30" 344000 345000 346000 40'00" 347000 348000 349000 350000 106°37'30"W 34°22'30"N 34°22'30"N Mass Alluvium Fans from Los Pinos — Gravels contain abundant Pyaa Qay Qay Qsx Qac QTsps Qac Qsfp Qac wastage Mountains Qsx Qsx composition from the subangular, locally derived clasts of the distal Palo Duro fan facies. The most distinctive clasts are Qay Qsfp QTsps Qay Qac Qfm Tib Qsfp Qay Qsfp Qat obsidians from Rabbit Mountain (Jemez Mountains; 1.4 Ma) and Grants (East Grants Ridge, 3 Ma). The unit is poorly Qsfp exposed. Unit is 0-4 m thick. Qac Qfm Qfp Qsx Qao Qac Qay Qsfl Qfi Holocene Fe Group, lower Pleistocene) — Pale gray (10YR 7/1 to 8/1) poorly consolidated, uncemented, poorly sorted proximal to Qsfp Qac Qao Qsfp Qsfp deposits to west. Clasts are all limestone and 3804000 QTsps Qac Qfm chert from the Gray Mesa Formation. Pedogenic carbonate horizon reaches Stage II. Fan is deeply incised by drainage to Qay Qam Palo Duro Canyon on the southwest side, and is moderately incised by drainages to the northeast. Includes more than one 000 Qsfp Qsfp 3804 surface level in proximal part of fan and base is on gray limestone of cuesta. Distal parts of fan are largely eolian sand with Qac Qfp QTsps Qsfp clasts of limestone. Thickness reaches 10 m exposed in canyon. Qay Qsfp Qao Sierra Ladrones Formation, coarse-grained fan deposits spread by ancestral Palo Duro drainage (upper Santa Fe Group, Qsfp lower Pleistocene) — Pink to reddish-yellow (7.5YR 6/6-7/3), poorly consolidated, uncemented to locally well cemented, Tlp Qfp Qao poorly to moderately sorted conglomerate and pebbly sand. Bedding follows planar, west and northwestward sloping Ttr af upper surfaces with extensive desert pavement; clasts include subangular to subrounded pebbles to boulders of rocks Quaternary Qto Qsfp QTsps Qsfpo Qfm QTsps Qac Qsfp 000 Qay 3803 leistocene et al. 1986) range in Qac P diameter to more than 1 m. Map unit is inset below older fan deposits (Tsfp and Qsfpo), and locally exhibits terrace-like 000 3803 af Qsx Qsfpo 10 m. QTsps af QTsps Xglp? Qsfp af Qsfpo CENOZOIC Qac QTsps QTsps Qac Qac Qay Photo 3. Pyaa); view to southwest liocene from Cibola Canyon drainage (341905E 3791576N). Note that dikes are resistant to erosion at stream level but Qsfp QTsps P Tsfp weather more than enclosing sandstones higher on slopes. 3802000 Igneous Qac Qfm Neogene Tp Rocks 3802000 QTsps Qsfp Qay Qsfpo Miocene Spears Formation (upper Eocene) — Light gray and light brownish gray volcaniclastic conglomerates, sandstones, siltstones Qfp Tlp Tsp Qsfp and reddish mudstones derived from intermediate-composition volcanic highlands, primarily to southwest of Joyita Hills, with auxiliary local sources. Subrounded to subangular dacite and andestite porphyry clasts range from boulders Qac Ttr to pebbles; they are common in lenticular to tabular 1-3m thick conglomeratic beds. Dacitic clasts are characterized by Qac Sedimentary sparse to abundant phenocrysts of plagioclase, hornblende and biotite; andesitic clasts are typically plagioclase-pyroxene QTsps Qfi Oligocene Rocks Tim Tib aleogene Qay P Tsp Tspa Tspa particularly where they overlie Permian San Andres outcrops on the La Joya quadrangle to the west (de Moor et al., 2005). 3801000 Eocene Andesitic lava within Spears Formation — Medium gray and purplish gray andesite exposed in small area within Tsp. Tsfp Tspa 3801000 af Ku Qsfp Cret. MESOZOIC Jm Qay A Tsfp Qsfp Jurassic Cretaceous Qfp Qsfp ^c Qac Tsfp MESOZOIC 20'00" Qsfp 20'00" Cretaceous (undivided) (Upper Cretaceous) — Because of the small size of surface exposures in the map area and possible ^m Ku structural complications, Cretaceous rocks are not subdivided on the map. The Cretaceous rocks were deposited within and 3800000 Triassic Photo 1. Exposure of Sierra Ladrones Formation, Palo Duro fan deposits (Qsfp) along northern edge of Palo in proximity to the Western Interior Seaway of North America during three major transgressive-regressive cycles (see Hook, QTsps Qac Qac stage III soil, and stage III-IV calcic soil horizon at the surface. Shovel on upper left surface is 1 m long for 1983; Hook et al., 2012, for summary papers). Strata include fossiliferous marine sandstone, shale and minor limestone, as 3800000 39 1 Pat Qac Pg Pylv well as non-marine clastic deposits. Shale units are poorly exposed in the Becker SW quadrangle; sandstones are generally 15 ^m scale. View is to north-northeast from 341162E 3799990N (all UTM coordinates are NAD27 13S). Qac Qac Ku D U Tsfp 34 QTsps Psa Qay Ku Ku Pylv Pylv 9 Sierra Ladrones Formation, elevated remnants of coarse-grained fan deposits spread by ancestral Palo Duro drainage System in the area includes, in ascending order, the main body of the Dakota Sandstone (~20 m thick just to the south of the Qto 8 Tsp Qac Qao Qsfpo Qat 33 Tsfp (upper Santa Fe Group, lower Pleistocene) — Pink to reddish-yellow (7.5YR 6/6-7/3), poorly consolidated, uncemented to quadrangle; see also Hook and Cobban, 2007), lower part of the Mancos Shale (~ 160 m), Tres Hermanos Formation (~ 73 Pylv Qfi 26 Qac Psa Pg m), D-Cross Tongue of the Mancos Shale (~ 61 m), Gallup Sandstone (~ 42 m), and the Crevasse Canyon Formation (~ 28 m) Qao Pg Qao Tsfp locally well cemented, poorly to moderately sorted conglomerate and pebbly sand. Surfaces exhibit degraded and brecciated Qao 3 Qsfp Qsfp Qay Pg Qac petrocalcic blocks with local desert pavement; clasts include subangular to subrounded pebbles to boulders of rocks from (thickness of units are from a composite section for Sevilleta National Wildlife Refuge by Hook et al., 2012, Fig. 6). Thus, the Pg Pylv 3 Qao Qao Cretaceous System in the area is on the order of 403 m thick. The small exposures of Cretaceous sandstone that are present 23 5 Pylv Pylv Tsp 13 Qac Qay12 8 ermian Pg 000 3799 P of the Mancos Formation, which together bracket the three major Late Cretaceous transgressive-regressive eustatic cycles Qay 8 3 Qac Pylv Pyaa is not exposed. Map unit is inset below older fan deposits (Tsfp). Thickness estimated from elevations above surrounding Qao U D in the region. 24 Qsfp Pg 8 10 Qsfp on the order of a few meters. Tspa Qac 8 Qao 000 Qay 2 *gm 3799 Ku 34 18 Pylv Pa Sierra Ladrones Formation, sandstone- and mudstone-dominated piedmont deposits (upper Santa Fe Group, lower Ku Psa Qsfp U Pg Pylv Qao Qac 8 Pylv D Qsfp QTsps Qfp Pleistocene to Pliocene) — Reddish-yellow (5YR 6/6), unconsolidated to poorly consolidated, uncemented to cemented, Qac Qac Pylv Qac ALEOZOIC Qac Qsfp Pylv Jurassic Qao Xglp P Qsfp 47 23 Qao ^c conglomeratic sandstone lenses exposed along Palo Duro Canyon west of “Five Points.” Beds commonly form upward- Qay ^c *b Qao ^c Qsfp 33 15 Pylv Qac Qac 24 ^m Pylv 19 Ku Pylv thin rhizoconcretionary beds, and cemented tufa-like spring-groundwater-precipitated deposits. Sandstone beds tend to Morrison Formation (Upper Jurassic) — Fine- to medium-grained litharenite and intercalated greenish mudstone to *a Jm sandy siltstone. Sandstones (some multi-story) generally weather dark brown to yellowish brown in blocky ledges, are 42 Qsfp Pg 10 anian comprise less than 30% of the unit. Thickness ranges from 0 to more than 20 m. 54 23 Qac 12 4 16 v ^m 6 ^m Tsfp l 6 y *gm Sierra Ladrones Formation, elevated remnants of coarse-grained fan deposits spread by ancestral Palo Duro drainage wood. Conglomerates locally contain an abundance of limestone clasts. Mudstone intervals are typically greenish-gray Pylv 21 ^m 000 Tsfp ^c Qsfp 9 17 3798 — Pink to reddish-yellow (7.5YR 6/6-7/3), poorly consolidated, locally well Pylv Qao ^c Pat 11 41 Xglp (upper Santa Fe Group, lower Pliocene) and covered. Hayden et al. (1990) suggested that the Morrison Formation is probably present in the map area; based on 19 Qsfp ^m Pat 12 9 cemented, poorly to moderately sorted conglomerate and pebbly sand. Surfaces exhibit degraded but thick brecciated 15 enns the lithology, stratigraphic position, and overall appearance of the deposits in comparison with other Morrison outcrops 000 Qsfp Qac 6 *s Igneous and 3798 Qac P 3 Qam Pat in central New Mexico, assignment to the Morrison Formation for these rocks is reasonable. Exposures in cuestas south of ^m 7 Metamorphic (2011); clasts include subangular to subrounded pebbles to boulders of rocks from the southern Los Pinos Mountains, 9 U Pg Pat Qay Gibbs Place suggest thicknesses of at least 60 m. ^c ^m ^m Psa D 20 ^c Qsfp Rocks Qsfp Qsfp ^c 2 Qac NO basalt, basaltic andesite, or rhyolite. The lack of 3.51-Ma basalt clasts and the stage V-VI petrocalcic horizon at the surface D Pat 7 ^m ^m U 33 Tim Qat suggest that this deposit is older than 3.5 Ma. Basal contact with underlying older bedrock is exposed along the north side of 34 ^m 17^m Qay Qay Xglp 23 5 Triassic Qac ^c Pat Qsfp Qao Xglp Palo Duro Canyon near “Five Points” where the thickness estimated to be approximately 10 m. Small exposures of Miocene ^m 5 ^c Qac Ku Qac 22 Pat Qsfp Qao 23 D U 27 Psa 12 PROTERO. Qsfp Qsfp Pat 20 Qsfp U D Qao ^m aleo-Proterozoic P Canyons are lumped into this unit.
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