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Bedrock geochemistry, Dickinson County, Michigan

Metadata Updated: January 22, 2026

The southern margin of the Archean Superior Province in the central Upper Peninsula of Michigan records Paleoproterozoic tectonic events involved in the ~2.1 Ga rifting of the proposed Archean supercraton Superia and the subsequent assembly of Laurentia. Within a small area of Dickinson County, Michigan, there are many distinctive geologic units with confounding structural and stratigraphic relationships that are key to understanding the geologic and tectonic evolution of the region. The samples included in this data release were collected for geochemistry to complement recent geochronological (Vallini and others, 2006; Ayuso and others, 2018) and geophysical research (Drenth and others, 2021) in the region. The geochemical data encompass the diverse geologic units that crop out mainly in Dickinson County. These eighteen samples include rocks from the Dickinson Group (Solberg schist, Six Mile amphibolite, and East Branch arkose), as well as samples of the Bell Creek gneiss, Hardwood gneiss, porphyritic red granite, gray gneiss, and several of the mafic dikes that cut through the region. Samples were analyzed by ActLabs for major and trace elements. Ayuso, R.A., Schulz, K.J., Cannon, W.F., Woodruff, L.G., Vasquez, J.A., Foley, N.K., and Jackson, J., 2018, New U-Pb zircon ages for rocks from the granite-gneiss terrane in northern Michigan: evidence for events at ~3750, 2750, and 1850 Ma: 64th Annual Institute on Lake Superior Geology Proceedings, Part 1—Program and Abstracts, p. 7-8. Drenth, B.J., Cannon, W.F., Schulz, K.J., and Ayuso, R.A., 2021, Geophysical insights into Paleoproterozoic tectonics along the southern margin of the Superior Province, central Upper Peninsula, Michigan, USA: Precambrian Research, v. 359, 106205. Vallini, D.A., Cannon, W.F., and Schulz, K.J., 2006, Age constraints for Paleoproterozoic glaciation in the Lake Superior region: detrital zircon and hydrothermal xenotime ages for the Chocolay Group, Marquette Range Supergroup: Canadian Journal of Earth Science, v. 43, p. 571-591.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date January 13, 2026
Metadata Updated Date January 22, 2026

Metadata Source

Harvested from DOI USGS DCAT-US

Additional Metadata

Resource Type Dataset
Metadata Created Date January 13, 2026
Metadata Updated Date January 22, 2026
Publisher U.S. Geological Survey
Maintainer
Identifier http://datainventory.doi.gov/id/dataset/USGS_660aae3bd34e4df16bd5898a
Data Last Modified 2024-11-08T00:00:00Z
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://ddi.doi.gov/usgs-data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Datagov Dedupe Retained 20260121204831
Harvest Object Id 520765c5-4e0d-410b-9408-18705b9e8595
Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
Harvest Source Title DOI USGS DCAT-US
Metadata Type geospatial
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Source Datajson Identifier True
Source Hash 285f8bfafe339d668a6a2e4f37ab5a3fd90e5ed1fb878b7c512a91479d2faeb6
Source Schema Version 1.1
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