Magmatic and structural framework of PGE and other mineralization in northwestern Wrangellia, central Alaska

A thick and regionally extensive sequence of low-grade-metamorphosed Late Triassic basaltic rocks, the Nikolai Greenstone, is a characteristic component of the stratigraphy of the Wrangellia terrane in central and southeastern Alaska, Yukon, and British Columbia. Mafic to ultramafic intrusions feeding this extensive volcanic province hold high geologic potential for discovery of economically signifigant magmatic sulfide deposits. This digital data file provides microprobe compositions of olivine and pyroxine from ultramafic samples across the study area. Mineral compositions and the ratio of molar MgO per(MgO+FeO) interpret magma evolution and provide insight into the magmatic-geochemical framework of Ni-Cu-Co-PGE mineralization related to the Butte, Rainy, Eureka, Canwell, and Talkeetna Mountains intrusions. These data accompany a summary report of findings from a multiyear Alaska Division of Geological & Geophysical Surveys (DGGS) project to better understand the geologic context of mineralization hosted by the Wrangellia terrane in the eastern Alaska Range and Talkeetna Mountains, with particular emphasis on evaluating the area's potential for hosting the strategic and critical platinum-group elements (PGEs) and cobalt (Co). Users can access the complete report and digital data from the DGGS website: http://doi.org/10.14509/30468.