Argon dates, paleomagnetic directions, and compositions of Pliocene to Pleistocene mafic volcanic rocks in the Goat Rocks area, Cascade Range, Washington State

The Goat Rocks volcanic cluster is a major andesitic locus in the southern Washington Cascade Range that persisted for approximately 3 million years (3.1 Ma to 115 ka) while coeval mafic volcanoes erupted on its periphery (Wall et al., 2018; Wall, 2022). The datasets presented in this data release were collected for a study that focuses on the mantle origin of the mafic magmas and their spatial, temporal, and compositional relationship to the central volcanic complex. Volcanic rock and tephra samples were collected from nine mafic volcanic units in the Goat Rocks area. The mafic units span ca. 3.6 million years to ca. 60 thousand years in age. Compositions are dominantly basalt and basaltic andesite, with lesser andesite and dacite. This data release includes sample locations, 40Ar/39Ar dates, measurements of paleomagnetic orientation (characteristic remanent magnetization), bulk rock major and trace element concentrations and isotopic ratios (XRF, ICP-MS, TIMS), and mineral compositions and backscatter electron images (EPMA), organized in five folders. Metadata (data dictionaries) for each data type are included in each folder. For detailed descriptions of analytical methods, as well as interpretation of these data, please see Wall et al. (2025). References: Wall, K.T., Grunder, A.L., Biasi, J., Weis, D., Swanson, D.A., and Stelten, M.E., 2025, Origin and evolution of mafic volcanism associated with 3 m.y. of andesite production at the Goat Rocks volcanic cluster, southern Washington Cascade Range: Geological Society of America Bulletin, https://doi.org/10.1130/B38046.1. Wall, K.T., 2022, The 3.1 Ma to 100 ka Goat Rocks Volcanic Complex: Persistence and Evolution of Magmatism at a Long-Lived Major Andesite Locus on the Cascade Arc: PhD Dissertation, Oregon State University, https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9g54xr50r. Wall, K.T., Grunder, A.L., Miggins, D.P., and Coble, M.A., 2018, Multistage growth and compositional change at the Goat Rocks volcanic complex, a major Pliocene-Pleistocene andesite center in the southern Washington Cascades, in Poland, M.P., Garcia, M.O., Camp, V.E., and Grunder, A., eds., Field Volcanology: A Tribute to the Distinguished Career of Don Swanson: Geological Society of America Special Paper 538, p. 63-91, https://doi.org/10.1130/2018.2538(04).

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  "geospatial"
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