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  3. Oxide and Cation Compositions of Feldspar Grains from Drill Core of the Duluth Complex, Minnesota

Oxide and Cation Compositions of Feldspar Grains from Drill Core of the Duluth Complex, Minnesota

Dates

Publication Date
Time Period
2014-04-30
Time Period
2015-04-10
Time Period
2015-05-05

Citation

Schulte, R.F., Seal, R.R., Piatak, N.M., and Woodruff, L.G., 2017, Oxide and cation compositions of feldspar grains from drill core of the Duluth Complex, Minnesota: U.S. Geological Survey data release, https://doi.org/10.5066/F7FJ2F9B.

Summary

The table contains oxide and cation compositions of feldspar grains from drill core of the Duluth Complex. The oxides were determined by electron probe microanalysis (EPMA) and are are reported in weight percent (wt%). The cations were then calculated and are reported in mole percent (mol%). Feldspar grains are a group of rock-forming tectosilicate minerals with potassium (K), sodium (Na), and calcium (Ca) endmembers. Anorthite has a chemical formula CaAlSi3O8; albite has the formula NaAlSi3O8; and orthoclase has the chemical formula KAlSi3O8. To better understand the composition of the measured feldspars, we calculated the anorthite content (An%) as (Ca/(Ca+Na+K)) x 100 and report the values in mol%. Albite (Ab%) was calculated as [...]

Contacts

Point of Contact :
Nadine Piatak
Originator :
Ruth F. Schulte, Robert R. Seal, II, Nadine M. Piatak, Laurel G. Woodruff
Metadata Contact :
Peter N Schweitzer
Publisher :
U.S. Geological Survey
Distributor :
GS ScienceBase
USGS Mission Area :
Energy and Minerals
SDC Data Owner :
Mineral Resources Program

Attached Files

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Oxide and Cation Compositions of Feldspar Grains from Drill Core of the Duluth Complex, Minnesota.xml
Original FGDC Metadata
View 		25.99 KB application/fgdc+xml
Feldspar Compositions.csv
“Feldspar Compositions” 		54.44 KB text/csv

Purpose

Data were collected in order to determine the chemical composition of feldspar grains found in drill core from the Duluth Complex. This data enabled us to calculate the anorthite content (An%) of the feldspars, which were then used to determine the neutralizing potential (NP) of the feldspar grains. This data was added to the NP of other silicate minerals in the Duluth Complex drill cores to give a total NP of the silicate minerals, which may impact the acid-generating potential of waste rock from proposed Cu-Ni-PGM mining.

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DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/F7FJ2F9B

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