2024

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Bindeman, I., Rudnick, R., Gaschnig, R., Hofmann, A. (in press) Triple oxygen and hydrogen isotope investigation of glacial diamictites through time: Chemical Geology.

 

*Boudreau, E., Gaschnig, R., Vervoort, J., Schwartz, J., Housen, B., Tikoff, B. (in press) Heavy mineral provenance and paleomagnetic studies of Mesozoic rocks in the Gold Beach terrane: GSA Bulletin.

 

Gaschnig, R.M., Lewis, R.S., Buddington, A., Mato, K. (2024) Basement, Belt, and batholith: bedrock geology of the Idaho Panhandle in McFadden, M.D., Pritchard, C.J., eds., Proterozoic Nuna to Pleistocene Megafloods: Sharing Geology of the Inland Northwest: GSA Field Guide 69, p. 1-25.

 

Mazza S.E., Gaschnig, R.M., Rudnick, R.L., Kleine, T. (2024) Tungsten stable isotope composition of the upper continental crust: Geochimica et Cosmochimica Acta, v. 370, p. 161-172.

 

Safi, A., Melikechi, N., Esseler, K.E., Gaschnig, R.M., Xia, W. (in press) Label free, machine learning informed plasma-based elemental biomarkers of Alzheimer’s disease: Journal of Analytical Atomic Spectrometry.

 

*Stegner, C., Gaschnig, R.M., *Marshall, S., Rader, S., Bebout, G., Penniston-Dorland, S. (in press) Molybdenum isotope behavior during subduction zone metamorphism in the Catalina Schist, California: Geochimica et Cosmochimica Acta.

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2023

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Gaschnig, R.M., Lewis, R.S., Vervoort, J.D. (2023) Age and origin of Early Cretaceous magmatism in the southernmost Omineca Belt, northern U.S. Cordillera: GSA Bulletin, v. 136, p. 1111-1126.

https://doi.org/10.1130/B36845.1

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Han, P.-Y., Rudnick, R. L., He, T., Marks, M. A. W., Wang, S.-J., Gaschnig, R. M., and Hu, Z.-C., 2023, Halogen (F, Cl, Br, and I) concentrations of the upper continental crust through time as recorded in ancient glacial diamictite composites: Geochimica et Cosmochimica Acta, v. 341, p. 28-45.

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Li, W., Nakada, R., Takahashi, Y., Gaschnig, R.M., Hu, Y., Shakouri, M., Liu, X-M. (2023) Cerium geochemical composition in the upper continental crust through time: Implications for tracing past redox environment: Geochimica et Cosmochimica Acta, v. 359, p. 20-29.

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Tian, S., Ding, X., Qi, Y., Wu, F., Yue, C., Gaschnig, R.M., Xiao, Z., Lv, W., Rudnick, R.L., Huang, F. (2023) Vanadium isotope evidence for emergence of felsic crust after 3 billion years: Proceedings of the National Academy of Sciences, v. 121, no. 11, e2220563120.  https://doi.org/10.1073/pnas.2220563120

 

2022

 

Gaschnig, R. M., Horan, M. F., Rudnick, R. L., Vervoort, J. D., Fisher, C. M. (2022) History of crustal growth in Africa and the Americas from detrital zircon and Nd isotopes in glacial diamictites: Precambrian Research, v. 373, 106641.

https://doi.org/10.1016/j.precamres.2022.106641

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Liu, X-M., Gaschnig, R.M., Rudnick, R.L., Hazen, R.M., Shahar, A. (2022) Tracing the secular evolution of the upper continental crust using iron isotopes in glacial diamictites: Geochemical Perspectives Letters, v. 22, p. 16-19.

https://doi.org/10.7185/geochemlet.2221

 

Murphy, M.E., Savage, P.S., Gardiner, N.J., Prave, A.R., Rudnick, R.L., Gaschnig, R.M. (2022) Homogenizing the upper continental crust: the Si isotope evolution of the crust recorded by ancient glacial diamictites: Earth and Planetary Science Letters, v. 591, 1176.  https://doi.org/10.1016/j.epsl.2022.117620

 

Tikoff, B., Kelso, P., Fayon, A.K., Gaschnig, R.M., Russo, R.M., Vervoort, J., Jicha, B., Kahn, M.J. (2022) The jagged western edge of Laurentia: The role of inherited rifted lithospheric structure in subsequent tectonism in the Pacific Northwest, in Whitmeyer, S.J., Williams, M.L., Kellett, D.A., Tikoff, B., eds, Laurentia: Turning Points in the Evolution of a Continent: GSA Memoir 220. 

 

2021

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Gaschnig, R.M., Rader, S., Reinhard, C.T., Owens, J., Planavsky, N., Wang, X., Asael, D., Greaney, A., Helz, R. (2021) Behavior of the Mo, Tl, and U isotope systems during 1 differentiation in the Kilauea Iki lava lake. Chemical Geology, v. 574, 12039.  https://doi.org/10.1016/j.chemgeo.2021.120239

 

Gaschnig, R.M., Reinhard, C.T., Planavsky, N., Wang, X., Asael, D., Jackson, M. (2021) The impact of primary processes and secondary alteration on the stable isotope composition of ocean island basalts: Chemical Geology, v. 81, 120416.

https://doi.org/10.1016/j.chemgeo.2021.120416

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*Rader, S.T., Gaschnig, R.M., Newby, S.M., Bebout, G.E., *Mirakian, M.J., Owens, J.D. (2021) Thallium behavior during high-pressure metamorphism in the western Alps, Europe: Chemical Geology, v. 579, 120349.      https://doi.org/10.1016/j.chemgeo.2021.120349

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Tian, S., Moynier, F., Inglis, E. C., Rudnick, R. L., Huang, F., Chauvel, C., Creech, J. B., Gaschnig, R. M., Wang, Z., Guo, J.-L. (2021) Zirconium isotopic composition of the upper continental crust through time: Earth and Planetary Science Letters, v. 572, 117086.

https://doi.org/10.1016/j.epsl.2021.117086
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2020

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Chen, K., Wang, Z., Tang, M., Rudnick, R.L., Gaschnig, R.M., Zou, Z., He, T., Hu, Z., Liu, Y. (2020) How mafic was the Archean upper continental crust? Insights from Cu and Ag in ancient glacial diamictites: Geochimica et Cosmochimica Acta, v. 278, 16-29.

 

Greaney, A. T., Rudnick, R. L., Romaniello, S. J., Johnson, A. C., Gaschnig, R. M., and Anbar, A. D., 2020, Molybdenum isotope fractionation in glacial diamictites tracks the onset of oxidative weathering of the continental crust: Earth and Planetary Science Letters, v. 534.

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Li, S., Junkin, W., Gaschnig, R.M., Ash, R.D., Piccoli, P., Candela, C., Rudnick, R.L. (2020) Molybdenum contents of sulfides in ancient glacial diamictites: implications for molybdenum delivery to the oceans prior to the Great Oxidation Event: Geochimica et Cosmochimica Acta, v. 278, 30-50.

 

2019

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Gaschnig, R.M. (2019) Benefits of a multi-proxy approach to detrital mineral provenance analysis: an example from New England: Geochemistry, Geophysics, and Geosystems. 

 

Wang, S-J., Rudnick R.L., Gaschnig, R.M., Wang, H., Wasylenki, L.E. (2019) Sulfide Weathering sustained methanogenesis during the Great Oxidation Event: Nature Geoscience.

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2018

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Greaney, A.T., Rudnick, R.L., Gaschnig, R.M., Whalen, J., Luais, B., and Clemens, J.D. (2018) Crustal residence of molybdenum: Geochimica et Cosmochimica Acta, v. 238, p. 36-54.

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Mundl, A., Walker, R.J., Reimink, J.R., Rudnick, R.L., Gaschnig, R.M. (2018) Temporal evolution of 182W in the upper continental crust: Chemical Geology, v. 494, p. 144-152.

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Nan, X-Y., Yu, H-M., Rudnick, R.L., Gaschnig, R.M., Xu, J., Li, W-Y., Zhang, Q., Jin, Z-D., Li, X-H., Huang, F. (in review) Barium isotopic composition of the upper continental crust: Geochimica et Cosmochimica Acta, v. 233, p. 33-49.

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​2017

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Byerly, A., Tikoff, B, Kahn, M., Jicha, B., Gaschnig, R.M., and Fayon, A.K. (2017) Internal fabrics of the Idaho batholith: Lithosphere, v. 9, p. 283-298.

 

Braudy, N., Gaschnig, R.M., Wilford, D., Vervoort, J.D., Nelson, C.L., Davidson, C., Kahn, M.J., and Tikoff, B. (2017) Timing and deformation conditions of the western Idaho shear zone, West Mountain, west-central Idaho: Lithosphere, v. 9, p. 157-183.

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Fayon, A.K., Tikoff, B., Kahn, M., and Gaschnig, R.M. (2017) Cooling and exhumation of the Idaho batholith: Lithosphere, v. 9, p. 299-314.

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Gaschnig, R.M., Macho, A.S., Kelso, P., Albee, R.D., Fayon, A., Vervoort, J.D., Schmitz, M., and Tikoff, B. (2017) Tonalitic magmatism, exhumation, and rotation along the Baker-Olds Ferry terrane boundary, Blue Mountains, eastern Oregon: Lithosphere, v. 9, p. 265-282.  PDF

 

Gaschnig, R.M., Reinhard, C., Planavsky, N., Wang, X., Asael, D., and Chauvel, C. (2017) Mo isotopes as a tracer of slab input in subduction zones: an example from Martinique, Lesser Antilles arc: Geochemistry, Geophysics, and Geosystems.  PDF

 

Gaschnig, R.M., Vervoort, J.D., Tikoff, B., and Lewis, R.S. (2017) Construction and preservation of batholiths in the northern U.S. Cordillera: Lithosphere, v. 9, p. 315-324.  PDF

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Greaney, A., Rudnick, R.L., Helz, R.T., Gaschnig, R.M., Piccoli, P.M., and Ash, R.D. (2017) The behavior of chalcophile elements during magmatic differentiation as observed in Kilauea Iki Lava Lake, Hawaii: Geochimica et Cosmochimica Acta, v. 210, p. 71-96.  PDF

 

2016

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Chen, K., Rudnick, R.L., Gao, S., Walker, R.J., Gaschnig, R.M., Puchtel, I.S., Tang, M., Hu, Z. (2016) Platinum-group element abundances and Re-Os isotopic systematics of the upper continental crust: evidence from glacial diamictites: Geochimica et Cosmochimca Acta, v. 191, p. 1-16.

 

Gaschnig, R.M., Rudnick, R.L., McDonough, W.F., Kaufman, A.J., Valley, J.W., Hu, Z., Gao, S., and Beck, M.L. (2016) Compositional evolution of the upper continental crust, as constrained by ancient glacial diamictites: Geochimica et Cosmochimica Acta, v. 186, p. 316-343.  PDF

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​​​Li, S., Gaschnig, R.M., and Rudnick, R.L. (2016) Origin of the chemical weathering signature in ancient glacial diamictite and the weathering signature of the upper continental crust: Geochimica et Cosmochimca Acta, v. 176, p. 96-117.  PDF

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Vervoort, J.D., Lewis, R.S., Fisher, C., Gaschnig, R.M., Jansen, A.C., and Brewer, R.A. (2016) Neoarchean and Paleoproterozoic crystalline basement rocks of north-central Idaho: constraints on the formation of western Laurentia: GSA Bulletin, v. 128, p. 94-109.  PDF

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2015

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Gaschnig, R.M., Rudnick, R.L., McDonough, W.F. (2015) Determination of Ga, Ge, Mo, Ag, Cd, In, Sn, Sb, W, Tl, and Bi in USGS whole-rock reference materials by standard addition ICP-MS: Geostandards and Geoanalytical Research, v. 39, p. 371-379.  PDF

 

Tang, M., Rudnick, R.L., McDonough, W.F., Gaschnig, R.M., and Huang, Y. (2015) Europium anomalies constrain the mass of recycled lower continental crust: Geology, v. 43, p. 703-706.  PDF

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2014

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Gaschnig, R.M., Rudnick, R.L., McDonough, W.F., Kaufman, A.J., Hu, Z., and Gao, S., (2014) Onset of oxidative continental weathering recorded by transition metal concentrations in ancient tillites: Earth and Planetary Science Letters, v. 408, p. 87-99.  PDF

 

2013

 

Dahlquist, JA., Pankhurst, R.J., Gaschnig, R.M., Rapela, C.W., Casquet, C., Alasino, P.H., Galindo, C., and Baldo, E.A. (2013) Hf and Nd isotopes in Early Ordovician to Early Carboniferous granites as monitors of crustal growth in the Proto-Andean margin of Gondwana: Gondwana Research, v. 23, p. 1617-1630.

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Gaschnig, R.M., Vervoort, J.D., Lewis, R.S., and Tikoff, B. (2013) Probing for Proterozoic and Archean crust in the northern U.S. Cordillera with inherited zircons from the Idaho batholith: GSA Bulletin, v. 125, p. 73-88.  PDF

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Hu, Z., Zhang, W., Liu, Y., Chen, H., Gaschnig, R.M., Zong, K., Li, M., Gao, S., and Hu, S. (2013) Rapid bulk rock decomposition by ammonium fluoride (NH4F) in open vessels at an elevated digestion temperature: Chemical Geology, v. 355, p. 144-152.  PDF

 

2012

 

Anfinson, O.A., Leier, A.L., Gaschnig, R.M., Embry, A.F., and Dewing, K. (2012) U-Pb and Hf isotopic data from Franklinian Basin strata: insights into the nature of Crockerland and the timing of accretion, Canadian Arctic Islands: Canadian Journal of Earth Sciences, v. 49, p. 1316-1328. 

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Davis, J.W., Coleman, D.S., Gracely, J.T., Gaschnig, R.M., and Stearns, M. (2012) Crystallization, thermochronology, and magma fluxes from plutons of the Sierra Nevada batholith, CA: Contributions to Mineralogy and Petrology, v. 163, no. 3, p. 449-465.  PDF

 

Gray, K.D., Watkinson, A.J., Gaschnig, R.M., and Isakson, V.H. (2012) Age and structure of the Crevice pluton: overlapping orogens in west-central Idaho?: Canadian Journal of Earth Sciences, v. 49, p. 709-731.

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Wang, X., Shu, X., Xu, X., Tang, M., and Gaschnig, R.M. (2012) Petrogenesis of the Early Cretaceous adakites-like porphyries and associated basaltic andesites in the eastern Jiangnan orogen, southern China: Journal of Asian Earth Sciences, v. 61, p. 243-256.

 

Zhang, W., Hu, Z., Liu, Y., Chen, H., Gao, S., and Gaschnig, R.M. (2012) Total rock dissolution using ammonium bifluoride (NH4HF2) in screw-top Teflon vials: a new development in open vessel digestion: Analytical Chemistry, v. 84, p. 10686−10693.

 

2011

 

Gaschnig, R.M., Vervoort, J.D., Lewis, R.S., and Tikoff, B. (2011) Isotopic evolution of the Idaho batholith and Challis intrusive province, northern U.S. Cordillera: Journal of Petrology, v. 52, p. 2397-2429.  PDF

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​2010

 

 

Gaschnig, R.M., Vervoort, J.D., Lewis, R.S., and McClelland, W.C. (2010) Migrating magmatism in the northern U.S. Cordillera: in situ U-Pb geochronology of the Idaho batholith: Contributions to Mineralogy and Petrology, v. 159, p. 863-883.  PDF

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* - former students and postdocs of mine