2018
DOI: 10.3389/feart.2018.00010
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Abstract: Basalts erupted in the Snake River Plain of central Idaho and sampled in the Kimama drill core link eruptive processes to the construction of mafic intrusions over 5.5 Ma. Cyclic variations in basalt composition reveal temporal chemical heterogeneity related to fractional crystallization and the assimilation of previously-intruded mafic sills. A range of compositional types are identified within 1,912 m of continuous drill core: Snake River olivine tholeiite (SROT), low K SROT, high Fe-Ti, and evolved and high… Show more

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Cited by 17 publications
(26 citation statements)
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References 53 publications
(112 reference statements)
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“…The chemical stratigraphy of volcanic rocks sampled by drill core offers valuable information on the relative timing of chemical variations that relate to both magma supply and crustal processes (e.g., Rhodes & Vollinger, 2004;Jean et al, 2013;Potter et al, 2018;Hickey-Vargas et al, 2018). Variations in source compositions and melting processes for primitive magmas may be inferred from changes in major element chemistry or incompatible trace element ratios, whereas crustal processes result in open or closed system fractionation trends and mixing arrays (e.g., Shervais et al, 2006).…”
Section: Chemostratigraphymentioning
confidence: 99%
“…The chemical stratigraphy of volcanic rocks sampled by drill core offers valuable information on the relative timing of chemical variations that relate to both magma supply and crustal processes (e.g., Rhodes & Vollinger, 2004;Jean et al, 2013;Potter et al, 2018;Hickey-Vargas et al, 2018). Variations in source compositions and melting processes for primitive magmas may be inferred from changes in major element chemistry or incompatible trace element ratios, whereas crustal processes result in open or closed system fractionation trends and mixing arrays (e.g., Shervais et al, 2006).…”
Section: Chemostratigraphymentioning
confidence: 99%
“…Finally, Potter et al (2018) showcase a time-integrated petrological and geochemical investigation of basalts from the Kimama borehole in the Snake River Plain of central Idaho, USA (Shervais et al, 2011(Shervais et al, , 2012(Shervais et al, , 2013. This rock core links eruptive processes to the construction of mafic intrusions and highlights the cyclic variations in basalt composition caused by temporal chemical heterogeneity related to fractional crystallization and assimilation of previously-intruded mafic sills over 5.5-millionyear history.…”
Section: How Do We Decipher the Record Preserved In Minerals Glassesmentioning
confidence: 86%
“…Through detailed logging of distinct lava flows representing single eruptive episodes and flow groups, the time-integrated chemical variation can be constrained. Potter et al (2018) propose that this evolution is related to source heterogeneity, magma processing during physical, and chemical evolution of the layered intrusions, and varying degrees of assimilation of gabbroic to ferrodioritic sills at shallow to intermediate depths over short periods of time.…”
Section: How Do We Decipher the Record Preserved In Minerals Glassesmentioning
confidence: 99%
“…Radiometric dating of individual lava flows at critical depths not only provides direct information on ages and accumulation rates but also provides calibration of the paleomagnetic time scale, which can then be used to refine the stratigraphic age model. Trends in geochemical data (e.g., upsection cycles of increasing K 2 O, TiO 2 , Mg#, and total iron as FeO*, as well as ratios of Ti/K, La/Lu, and Zr/Nb) are used as a tool to identify individual flow groups (Shervais et al, 2006;Jean et al, 2013;Potter et al, 2018).…”
Section: Introductionmentioning
confidence: 99%
“…The ultimate goal of our research on the Kimama drill core is to merge lithologic observations and ages with major-and trace-element geochemistry and radiogenic isotope ratios to generate a complete history of basaltic volcanism in the CSRP. The integration of lithology, flow structures, wireline logs, magnetostratigraphy, all discussed here, and geochemistry, discussed in Potter et al (2018), provides a powerful set of tools to interpret the timing, extent, and source of regional volcanism related to passage of the Yellowstone hotspot magmatism. The volcanic flux, and the volume of magma erupted through time, are first-order constraints on the ultimate origin of the hotspot and on its interaction with continental lithosphere.…”
Section: Introductionmentioning
confidence: 99%