Geosciences and Environmental Change Science Center

Publications

Filter Total Items: 1,231
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Year Published: 2021

A bayesian nonparametric approach to unmixing detrital geochronologic data

Sedimentary deposits constitute the primary record of changing environmental conditions that have acted on Earth’s surface over geologic time. Clastic material is eroded from source locations (parents) in sediment routing systems and deposited at sink locations (children). Both parents and children have characteristics that vary across many...

Tipton, John R.; Sharman, Glenn R.; Johnstone, Samuel A.

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Year Published: 2021

Detrital zircon record of magmatism and sediment dispersal across the North American Cordilleran arc system (28-48°N)

As zircon U-Pb geochronology has become a leading method in sediment provenance studies and basin analysis over the past 20 years, the volume of detrital zircon data made available in published literature has enabled researchers to go beyond source-to-sink provenance studies to explore increasingly complex...

Schwartz, Theresa Maude; Surpless, Kathleen D.; Colgan, Joseph P.; Johnstone, Samuel A.; Holm-Denoma, Christopher S.

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Year Published: 2021

Insights on geochemical, isotopic, and volumetric compositions of produced water from hydraulically fractured Williston Basin oil wells

Tracing produced water origins from wells hydraulically fractured with freshwater-based fluids is sometimes predicated on assumptions that (1) each geological formation contains compositionally unique brine and (2) produced water from recently hydraulically fractured wells resembles fresher meteoric water more so than produced water from older...

Gallegos, Tanya J.; Doolan, Colin A.; Caldwell, Rodney R.; Engle, Mark A; Varonka, Matthew S.; Birdwell, Justin E.; Jolly, Glenn D.; Coplen, Tyler B.; Oliver, Thomas A.

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Year Published: 2021

Surficial geology of the northern San Luis Valley, Saguache, Fremont, Custer, Alamosa, Rio Grande, Conejos, and Costilla Counties, Colorado

The San Luis Valley and associated underlying basin of south-central Colorado and north-central New Mexico is the largest structural and hydrologic basin of the Rio Grande Rift and fluvial system. The surrounding San Juan and Sangre de Cristo Mountains reveal evidence of widespread volcanism and transtensional tectonism beginning in the Oligocene...

Ruleman, Chester A.; Brandt, Theodore R.
Ruleman, C.A., and Brandt, T.R., 2021, Surficial geology of the northern San Luis Valley, Saguache, Fremont, Custer, Alamosa, Rio Grande, Conejos, and Costilla Counties, Colorado: U.S. Geological Survey Scientific Investigations Map 3475, 2 sheets, scale 1:75,000, https://doi.org/10.3133/sim3475.

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Year Published: 2021

Detecting subtle change from dense landsat time series: Case studies of mountain pine beetle and spruce beetle disturbance

In contrast to abrupt changes caused by land cover conversion, subtle changes driven by a shift in the condition, structure, or other biological attributes of land often lead to minimal and slower alterations of the terrestrial surface. Accurate mapping and monitoring of subtle change are crucial for an early warning of long-term gradual change...

Ye, Su; Rogan, John; Zhu, Zhe; Hawbaker, Todd J.; Hart, Sarah J.; Andrus, Robert A.; Meddens, Arjan J.H.; Hicke, Jeffery A.; Eastman, J. Ronald; Kulakowski, Dominik

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Year Published: 2021

Evidence for variable precipitation and discharge from Upper Cretaceous–Paleogene fluvial deposits of the Raton Basin, Colorado–New Mexico, U.S.A.

The Raton Basin of Colorado–New Mexico, USA, is the southeasternmost basin of the Laramide intraforeland province of North America. It hosts a thick succession (4.5 km or 15,000 ft) of Upper Cretaceous to Paleogene marine and continental strata that were deposited in response to the final regression of the Western Interior Seaway and the onset of...

Schwartz, Theresa Maude; Dechesne, Marieke; Zellman, Kristine L.

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Year Published: 2021

Reconstructing paleohydrology in the northwest Great Basin since the last deglaciation using Paisley Caves fish remains (Oregon, U.S.A.)

The arid northwest Great Basin underwent substantial hydroclimate changes in the past 15,000 years, greatly affecting its desert ecosystems and prehistoric people. There are conflicting interpretations of the timing of hydrologic changes in this region, requiring more records to resolve the dominant climatic drivers. The Paisley Caves...

Hudson, Adam M.; Emery-Wetherell, Meaghan M; Lubinski, Patrick M; Butler, Virginia L.; Grimstead, Deanna N; Jenkins, Dennis L

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Year Published: 2021

Development of soil radiocarbon profiles in a reactive transport framework

Today, there is a greater appreciation for the importance of the physical protection of carbon (C) through interactions with mineral surfaces, isolation from microbes, and the important role of transport in shaping soil properties and controlling moisture limitations on decomposition. As our paradigm for soil organic carbon...

Druhan, Jennifer; Lawrence, Corey

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Year Published: 2021

Aeolian sediments in paleowetland deposits of the Las Vegas Formation

The Las Vegas Formation (LVF) is a well-characterized sequence of groundwater discharge (GWD) deposits exposed in and around the Las Vegas Valley in southern Nevada. Nearly monolithologic bedrock surrounds the valley, which provides an excellent opportunity to test the hypothesis that GWD deposits include an aeolian component. Mineralogical data...

Goldstein, Harland L.; Springer, Kathleen B.; Pigati, Jeffrey S.; Reheis, Marith C.; Skipp, Gary L.

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Year Published: 2021

Oxygen isotopes in terrestrial gastropod shells track Quaternary climate change in the American Southwest

Recent studies have shown the oxygen isotopic composition (δ18O) of modern terrestrial gastropod shells is determined largely by the δ18O of precipitation. This implies that fossil shells could be used to reconstruct the δ18O of paleo-precipitation as long as the isotopic system, including the hydrologic pathways of the local watershed and the...

Rech, Jason A.; Pigati, Jeffrey S.; Springer, Kathleen B.; Bosch, Stephanie; Nekola, Jeffrey C.; Yanes, Yurena

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Year Published: 2021

Using the landsat burned area products to derive fire history relevant for fire management and conservation in the state of Florida, southeastern USA

Development of comprehensive spatially explicit fire occurrence data remains one of the most critical needs for fire managers globally, and especially for conservation across the southeastern United States. Not only are many endangered species and ecosystems in that region reliant on frequent fire, but fire risk analysis, prescribed fire planning...

Teske, Casey; Vanderhoof, Melanie K.; Hawbaker, Todd J.; Noble, Joe; Hires, J. Kevin

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Year Published: 2021

8,000 years of climate, vegetation, fire and land-use dynamics in the thermo-mediterranean vegetation belt of northern Sardinia (Italy)

Knowledge about the vegetation history of Sardinia, the second largest island of the Mediterranean, is scanty. Here, we present a new sedimentary record covering the past ~ 8,000 years from Lago di Baratz, north-west Sardinia. Vegetation and fire history are reconstructed by pollen, spores, macrofossils and charcoal analyses and environmental...

Pedrotta, Tiziana; Gobet, Erika; Schwörer, Christoph; Beffa, Giorgia; Butz, Christoph; Henne, Paul D.; Morales-Molino, César; Pasta, Salvatore; Van Leeuwen, Jacqueline; Vogel, Hendrik; Zwimpfer, Elias; Anselmetti, Flavio; Grosjean, Martin; Tinner, Willy