Tertiary stratigraphy and tectonic development of the Alamosa basin (northern San Luis Basin), Rio Grande rift, south-central Colorado

Brister, Brian S.; Gries, Robbie

doi:10.1130/spe291-p39

Cited by 43 publications

(43 citation statements)

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“…Alternatively, the heterogeneity could represent an environment of intermittent lake development that was localized near the well site, especially in the interval above 150 ft (45.7 m). A calcite-cemented sand layer at 181-191 ft (55.2-58.2 m) might represent one of the laterally extensive, poorly cemented sand layers described by Brister and Gries (1994), which they interpret as marking the beginning of the demise of Lake Alamosa.…”

Section: Summary Of Findingsmentioning

confidence: 99%

“…However, this section may not include the uppermost part of the Alamosa Formation, which should have persisted until at least 0.44 Ma (Machette and others, 2013). Several oil and gas wildcat wells also drilled through the Alamosa Formation, encountering thick clays, claystones, and fossil debris (Huntley, 1979b;Brister and Gries, 1994). Brister and Gries (1994) noted the presence of widely distributed, poorly cemented sandstone horizons near the top of the Alamosa Formation.…”

Section: Regional Setting and Geophysical Studiesmentioning

confidence: 99%

“…Several oil and gas wildcat wells also drilled through the Alamosa Formation, encountering thick clays, claystones, and fossil debris (Huntley, 1979b;Brister and Gries, 1994). Brister and Gries (1994) noted the presence of widely distributed, poorly cemented sandstone horizons near the top of the Alamosa Formation. They considered these horizons to mark the beginning of the demise of the lake.…”

Section: Regional Setting and Geophysical Studiesmentioning

confidence: 99%

“…The formation consists of fluvio-lacustrine sediments, including massive clay to interbedded clay and sand as much as hundreds of meters thick (Huntley, 1979b). The sediments accumulated within tectonically subsiding rift basins while the lake was expanding and contracting in response to climate changes (Brister and Gries, 1994;Machette and others, 2013). Although lacustrine clastic deposits have been mapped at the surface, most of the evidence of the massive clay left behind by the lake is found in wells (Huntley, 1979a,b;Machette andothers, 2007, 2013).…”

Section: Regional Setting and Geophysical Studiesmentioning

confidence: 99%

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Sample descriptions and geophysical logs for cored well BP-3-USGS, Great Sand Dunes National Park and Preserve, Alamosa County, Colorado

Grauch¹,

Skipp²,

Thomas³

et al. 2015

Data Series

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Section: Summary Of Findingsmentioning

confidence: 99%

Section: Regional Setting and Geophysical Studiesmentioning

confidence: 99%

Section: Regional Setting and Geophysical Studiesmentioning

confidence: 99%

Section: Regional Setting and Geophysical Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Sample descriptions and geophysical logs for cored well BP-3-USGS, Great Sand Dunes National Park and Preserve, Alamosa County, Colorado

Grauch¹,

Skipp²,

Thomas³

et al. 2015

Data Series

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“…The thrusting transported Late Paleozoic rocks kilometers to the east and northeast into deformed and stacked thrust packages that lie mostly within the western front of the Sangre de Cristo Mountains today [14]. Toward the end of the Laramide orogeny, uplifts were again eroded, shedding detritus to the west into a depression now located in the subsurface on the western side of the San Luis Basin [15].…”

Section: Inset)mentioning

confidence: 99%

Identifying Buried Segments of Active Faults in the Northern Rio Grande Rift Using Aeromagnetic, LiDAR, and Gravity Data, South-Central Colorado, USA

Grauch

Ruleman

2013

International Journal of Geophysics

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Combined interpretation of aeromagnetic and LiDAR data builds on the strength of the aeromagnetic method to locate normal faults with significant offset under cover and the strength of LiDAR interpretation to identify the age and sense of motion of faults. Each data set helps resolve ambiguities in interpreting the other. In addition, gravity data can be used to infer the sense of motion for totally buried faults inferred solely from aeromagnetic data. Combined interpretation to identify active faults at the northern end of the San Luis Basin of the northern Rio Grande rift has confirmed general aspects of previous geologic mapping but has also provided significant improvements. The interpretation revises and extends mapped fault traces, confirms tectonic versus fluvial origins of steep stream banks, and gains additional information on the nature of active and potentially active partially and totally buried faults. Detailed morphology of surfaces mapped from the LiDAR data helps constrain ages of the faults that displace the deposits. The aeromagnetic data provide additional information about their extents in between discontinuous scarps and suggest that several totally buried, potentially active faults are present on both sides of the valley.

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Late Glacial and Holocene record of climatic change in the southern Rocky Mountains from sediments in San Luis Lake, Colorado, USA

Yuan

Koran

Valdez³

2013

Palaeogeography, Palaeoclimatology, Palaeoecology

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in hydroclimate and widely distributed on land (Street and Grove, 1979). Oxygen isotope record of Owens Lake documents the existence of millennial-scale hydrologic oscillations during the last glacial termination (Benson et al., 1997). Holocene records from Walker and Pyramid Lakes indicate decadal to centennial-scale hydroclimatic variability in the Sierra Nevada (Benson et al., 2002; Yuan et al., 2004). Stable isotope records from alpine lakes over the Colorado Rocky Mountains suggest that the climate shifted from a greater summer precipitation in the early Holocene to a winter-dominated precipitation regime in the mid-Holocene (Friedman et al., 1988; Anderson, 2011; Anderson, 2012). These studies provide us important isotopic data on the past changes in climate over the American Southwest. However, lake-based δ 18 O records spanning the entire Late Glacial and Holocene transition (LGHT) are scarce in this region. Here we describe our efforts to reconstruct climatic and environmental changes in the southern Rocky Mountains during the Late Glacial and Holocene. We chose San Luis Lake mainly because it sits at the southern edge of the annual latitudinal range of the Pacific winter storm tracks and on the northern limit of the North American monsoon (NAM) rainfall regime (Metcalfe et al., 1997; Barron et al., 2012; Ellis and Barton, 2012). Changes in either winter or summer precipitation regime may alter the lake's hydrology, isotope geochemistry and depositional environment. Past work on this basin has showed that deposits from certain locations may be appropriate for paleoclimate reconstructions (Shafer, 1989; Rogers et al., 1992; De Lanois, 1993). We collected sediment cores from San Luis Lake and carried out a series of physical and chemical analyses, including magnetic susceptibility, grain size, total inorganic carbon (TIC), Mg/Ca, δ 18 O, and δ 13 C, to indicate climatic and environmental changes over the last 16.5 ka. Results from radiometric dating analyses (C-14, Pb-210, Cs-137 and Ra-226) are obtained for age control. Our sediment record from San Luis Lake documented a detailed history of climatic and environmental changes in the southern Rocky Mountains since the last glacial maximum. We compared our record from San Luis Lake with existing paleoclimate data from Colorado and elsewhere in the American Southwest and distant regions to gain novel insights into the changes in hydroclimate over the southern Rocky Mountains during the Late Glacial and Holocene.

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Tertiary stratigraphy and tectonic development of the Alamosa basin (northern San Luis Basin), Rio Grande rift, south-central Colorado

Cited by 43 publications

References 0 publications

Sample descriptions and geophysical logs for cored well BP-3-USGS, Great Sand Dunes National Park and Preserve, Alamosa County, Colorado

Sample descriptions and geophysical logs for cored well BP-3-USGS, Great Sand Dunes National Park and Preserve, Alamosa County, Colorado

Identifying Buried Segments of Active Faults in the Northern Rio Grande Rift Using Aeromagnetic, LiDAR, and Gravity Data, South-Central Colorado, USA

Late Glacial and Holocene record of climatic change in the southern Rocky Mountains from sediments in San Luis Lake, Colorado, USA

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