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- Description:
- Assessing the precision of different geochemical methods is crucial for quantifying rare earth elements (REEs) and critical minerals (CMs) in coal-bearing sedimentary strata, with application to broader sedimentary systems. This study analyzed 230 samples via portable X-ray fluorescence (pXRF) and subsequently high-graded them for inductively coupled plasma-mass spectrometry (ICP-MS) analysis. Samples originate from the Uinta Region of Utah and Western Colorado, with lithologies including coal, claystone, siltstone, mudstone, shale, sandstone, and igneous dikes. REE quantification relies heavily on pXRF and ICP-MS datasets, but the precision between these two methods is unconstrained, encouraging the investigation into the controlling variables associated with each analytical technique. With precision as the primary objective, several sample homogeneity and spatial experiments were conducted to compare pXRF and ICP-MS datasets. Results indicate that both datasets exhibit the greatest similarity when analyzing semi-equivalent areas and volumes of samples. Across all lithologies, powdered samples consistently exhibit greater precision between pXRF and ICP-MS datasets than whole rock samples, as seen in improved r2 values. This finding supports a proposed spatial grid approach to pXRF that quantifies the homogeneity of a three-dimensional sample, resulting in data statistically similar to that of ICP-MS. Ultimately, coupled high-resolution analyses using complimentary pXRF and ICP-MS methods (recommended herein) provide the greatest understanding of REE enrichment with the objective of precision. This recommended methodology produces an unbiased pXRF dataset, 63.3%-76.7% statistically similar to that of ICP-MS. This development is crucial for the confident utilization of pXRF analysis for geochemical evaluation, especially considering domestic CM resources.
- Keyword:
- Piceance Basin, critical minerals , precision, Blackhawk Formation, Uinta Basin, pXRF, Ferron Sandstone, Mesaverde Group, methodology, ICP-MS, energy transition, and rare earth elements
- Subject:
- sedimentology, critical minerals, stratigraphy, and geochemistry
- Creator:
- Gall, Ryan, Morris, Emma, Free, Michael, Fernandez, Diego, Coe, Haley, Fausett, Peyton, Birgenheier, Lauren, Vanden Berg, Michael, and Giebel, Andrew
- Owner:
- Date Uploaded:
- 01/22/2025
- Date Modified:
- 01/27/2025
- Date Created:
- 2022-05-23 to 2024-04-12
- License:
- Public Domain – This data is free of copyright restrictions (e.g. government sponsored data).
- Identifier:
- http://doi.org/10.7278/S5d-xmpj-tq44
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- Description:
- This study investigates the internal facies architecture of a river-dominated delta deposit using outcrops of the Cretaceous Panther Tongue of the Star Point Sandstone in central Utah, U.S.A. A series of photorealistic virtual outcrop models (VOM) were created from ~13 linear-km of outcrop. These VOMs, alongside field observations, were used to identify and map facies and facies associations over the ~25 m-thick stratigraphic interval. A new workflow for querying VOMs as outcrop analogs for subsurface reservoir analogs was developed, using a database of measurements (Panther Tongue - outcrop analog - metric database) was constructed using 60 digital sections that were measured within the VOMs at 152 m (~500 ft) spacing. This database characterizes a total of 508 sandstone beds by their thickness, length, and dip, from which the average thickness (0.78 m), bed length (330 m), and bed dip (2˚ towards the south) were calculated. Thinning rates were also calculated in both depositional strike and depositional dip directions (1.37x10-2 and 1.01x10-2 respectively). The workflow established in this study is applicable to other sedimentary outcrops and environments, thus demonstrating that VOMs can be used as a basis for quantitative database development and reservoir modeling inputs.
- Keyword:
- shallow marine sedimentology, outcrop metrics, and Virtual outcrop models of ancient river-dominated delta system
- Subject:
- Cretaceous Period, Outcrops, and Deltas
- Creator:
- Morris, Emma, Johnson, Cari, and Atlas, Claire
- Owner:
- Emma Morris
- Based Near Label Tesim:
- Helper, Utah, United States
- Language:
- English
- Date Uploaded:
- 04/07/2023
- Date Modified:
- 06/03/2024
- Date Created:
- 2020-01-01 to 2022-05-31
- License:
- CC BY NC - Allows others to use and share your data non-commercially and with attribution.
- Resource Type:
- Other
- Identifier:
- https://doi.org/10.7278/S50d-njws-r7tz
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- Description:
- The data are bed-scale measurements taken from virtual outcrop models (Morris, E.A., Atlas, C.E., Johnson, C.L., 2023, Architectural analysis of the Panther Tongue - virtual outcrop models) and calibrated with measurements taken at outcrop in the field.
- Keyword:
- outcrop metrics, geology, delta lobes, virtual outcrop models, shallow marine sedimentology , reservoir characteristics, and geophysics
- Subject:
- Geography and Geophysics
- Creator:
- Atlas, Claire, Morris, Emma, and Johnson, Cari
- Contributor:
- Claire Atlas
- Owner:
- Emma Morris
- Based Near Label Tesim:
- Salt Lake City, Utah, United States
- Language:
- English
- Date Uploaded:
- 12/20/2022
- Date Modified:
- 06/03/2024
- Date Created:
- 2020-01-01 to 2022-05-31
- License:
- CC BY NC - Allows others to use and share your data non-commercially and with attribution.
- Resource Type:
- Dataset
- Identifier:
- https://doi.org/10.7278/S50d-40cy-rkf5