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Lithogeochemistry and images of selected drill core samples from the Mineral Hill alkaline complex, Wyoming

Dates

Publication Date
Time Period
1970
Time Period
2020

Citation

Andersen, A.K., Olinger, D.A., Navarra, A.M., and Howard, C.K., 2021, Lithogeochemistry and images of selected drill core samples from the Mineral Hill alkaline complex, Wyoming: U.S. Geological Survey data release, https://doi.org/10.5066/P94E59KF.

Summary

This data release contains analytical data and images for a suite of drill core samples from the Mineral Hill alkaline complex (MHAC), northeastern Wyoming. Geochemistry data include major and trace element analytical results for 103 alkaline igneous rock samples. Images include hand sample photographs of halved core and full thin section images captured in transmitted, plane-polarized and cross-polarized light. Samples are from two core holes drilled by Humble Oil Company in 1970, and subsequently acquired and stored by Felix Mutschler at Eastern Washington University. The two skeletonized (incomplete) drill cores were acquired by the U.S. Geological Survey Geology, Minerals, Energy, and Geophysics Spokane office in 2019, through [...]

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Attached Files

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Mineral_Hill_Drill_Hole_Geochemistry_DataDictionary.csv 38.38 KB text/csv
Mineral_Hill_Drill_Hole_Geochemistry.csv 65.18 KB text/csv
Drillhole_MHM_2_whole_rock_photos.zip 76.23 MB application/zip
Drillhole_MHM_2_thin_section_images.zip 18.35 MB application/zip
Drillhole_MHM_1_thin_section_images.zip 245.78 MB application/zip
Drillhole_MHM_1_whole_rock_photos.zip 548.74 MB application/zip
Cross-polarized thin section image of jacupirangite cut by foid syenite vein.jpeg
“Cross-polarized thin section image of jacupirangite cut by foid syenite vein”
thumbnail 12.47 MB image/jpeg
Cross-polarized thin section image of foid syenite-ijolite contact.jpeg
“Cross-polarized thin section image of foid syenite-ijolite contact”
thumbnail 10.23 MB image/jpeg

Purpose

The purpose of this study was to assess the critical mineral potential of Paleogene intrusive rocks of the MHAC and improve existing rock classifications based on petrography and geochemistry. The MHAC is located approximately 25 km east of the carbonatite-hosted rare-earth element (REE) deposit in the Bear Lodge alkaline complex, Wyoming. Paleogene intrusive rocks from the two complexes are similar in composition and diatreme breccia pipes are found at the center of both complexes. Drill core samples from Mineral Hill were examined for evidence of possible carbonatite intrusions and analyzed for REE content. The more mafic clinopyroxenite samples from drill hole MHM-2 were analyzed for REEs that might be hosted in the abundant apatite (~15 percent modal), and platinum-group elements that accompany copper sulfide mineralization in some alkaline porphyry-epithermal systems (Werle and others, 1984; Holwell and others, 2019). These data are made available for use in geologic, exploration, and environmental background studies.

Additional Information

Identifiers

Type Scheme Key
DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P94E59KF

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