scholarly journals Geochemistry and geochronology of the Jim Sage volcanic suite, southern Idaho: Implications for Snake River Plain magmatism and its role in the history of Basin and Range extension

Geosphere ◽  
2013 ◽  
Vol 9 (6) ◽  
pp. 1681-1703 ◽  
Author(s):  
A. Konstantinou ◽  
J. Valley ◽  
A. Strickland ◽  
E. L. Miller ◽  
C. Fisher ◽  
...  
Keyword(s):  
Basin And Range ◽  
Snake River Plain ◽  
Range Extension ◽  
Snake River ◽  
Volcanic Suite ◽  
History Of ◽  
River Plain

scholarly journals First Results from HOTSPOT: The Snake River Plain Scientific Drilling Project, Idaho, U.S.A.

2013 ◽  
Vol 15 ◽  
pp. 36-45 ◽  
Author(s):  
J. W. Shervais ◽  
D. R. Schmitt ◽  
D. Nielson ◽  
J. P. Evans ◽  
E. H. Christiansen ◽  
...  
Keyword(s):  
Thermal Anomaly ◽  
Surface Expression ◽  
Snake River Plain ◽  
Snake River ◽  
Scientific Drilling ◽  
Geophysical Logging ◽  
First Results ◽  
History Of ◽  
Rhyolite Volcanism ◽  
River Plain

HOTSPOT is an international collaborative effort to understand the volcanic history of the Snake River Plain (SRP). The SRP overlies a thermal anomaly, the Yellowstone-Snake River hotspot, that is thought to represent a deep-seated mantle plume under North America. The primary goal of this project is to document the volcanic and stratigraphic history of the SRP, which represents the surface expression of this hotspot, and to understand how it affected the evolution of continental crust and mantle. An additional goal is to evaluate the geothermal potential of southern Idaho. <br><br> Project HOTSPOT has completed three drill holes. (1) The Kimama site is located along the central volcanic axis of the SRP; our goal here was to sample a long-term record of basaltic volcanism in the wake of the SRP hotspot. (2) The Kimberly site is located near the margin of the plain; our goal here was to sample a record of high-temperature rhyolite volcanism associated with the underlying plume. This site was chosen to form a nominally continuous record of volcanism when paired with the Kimama site. (3) The Mountain Home site is located in the western plain; our goal here was to sample the Pliocene-Pleistocene transition in lake sediments at this site and to sample older basalts that underlie the sediments. <br><br> We report here on our initial results for each site, and on some of the geophysical logging studies carried out as part of this project. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.15.06.2013" target="_blank">10.2204/iodp.sd.15.06.2013</a>

Constraints on olivine deformation mechanisms from SKS shear-wave splitting beneath the High Lava Plains, Northwestern Basin and Range and Western Yellowstone Snake River Plain

2021 ◽  
Author(s):  
Eric Löberich ◽  
Maureen D. Long ◽  
Lara S. Wagner ◽  
Ehsan Qorbani ◽  
Götz Bokelmann
Keyword(s):  
Shear Wave ◽  
Upper Mantle ◽  
Basin And Range ◽  
Shear Wave Splitting ◽  
Snake River Plain ◽  
Snake River ◽  
Azimuthal Variation ◽  
Wave Splitting ◽  
High Lava Plains ◽  
River Plain

&lt;p&gt;Shear-wave splitting observations of SKS and SKKS phases have been used widely to map azimuthal anisotropy, and to constrain the dominant mechanism of upper mantle deformation. As the interpretation is often ambiguous, it is useful to consider additional information, e.g. based on the non-vertical incidence of core-phases. Depending on the lattice-preferred orientation of anisotropic minerals, this condition leads to a variation of splitting parameters with azimuth and enables a differentiation between various types of olivine deformation. As the fabric of olivine-rich rocks in the upper mantle relates to certain ambient conditions, it is of key importance to further define it. In this study, we predict the azimuthal variation of splitting parameters for A-, C-, and E-type olivine, and match them with observations from the High Lava Plains, Northwestern Basin and Range, and Western Yellowstone Snake River Plain. This can help to constrain the amount of water in the upper mantle beneath an area, known for a consistent, mainly E-W fast orientation, and increased splitting delay in the back-arc of the Cascadia Subduction Zone. Comparing expected and observed variations renders a C-type olivine mechanism unlikely; a differentiation between A- and E-type olivine remains more difficult though. However, the agreement of the amplitude of azimuthal variation of the fast orientation, and the potential to explain larger splitting values, suggest the occurrence of E-type olivine and the presence of a hydrated upper mantle. Along with a discrepancy to predict delay times from azimuthal surface wave anisotropy, deeper sources could further affect shear-wave splitting observations.&lt;/p&gt;

Strain rates and contemporary deformation in the Snake River Plain and surrounding Basin and Range from GPS and seismicity

Geology ◽  
2008 ◽  
Vol 36 (8) ◽  
pp. 647 ◽  
Author(s):  
Suzette J. Payne ◽  
Robert McCaffrey ◽  
Robert W. King
Keyword(s):  
Basin And Range ◽  
Snake River Plain ◽  
Snake River ◽  
Strain Rates ◽  
River Plain
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