Browsing by Author "Grunder, Anita L."

Basaltic volcanism and tectonics of the High Lava Plains, southeastern Oregon

Jordan, Brennan T. (2001-06-28)

Constraining the magmatic evolution of the Andean arc at 21⁰S using the volcanic and petrologic history of Volćán Aucanquilcha, Central Volcanic Zone, northern Chile

Klemetti, Erik W. (2005-02-22)

Volcan Aucanquilcha, a Pleistocene to Recent composite volcano in northern Chile, is the youngest and center-most member of the 11 m.y.-old Aucanquilcha Volcanic Cluster (AVC). The AVC has produced [approximately]350 k ...

Controls on eruption style and magma compositions at Mount Hood, Oregon

Koleszar, Alison M. (2011-07-21)

This study is an effort to characterize the magma sources, plumbing system, and eruptive behavior of Mount Hood, a low-explosivity recharge-dominated volcano in the Oregon Cascades. The three manuscripts in this disserta ...

Deep crustal and mantle inputs to North Sister Volcano, Oregon High Cascade Range

Schmidt, Mariek E. (2005-11-11)

The Central Oregon High Cascade Range is an anomalously mafic segment of the Cascade Arc due to ongoing intra-arc extension, which allows most magmas to traverse the crust without stalling and evolving to more evolved ...

Dynamics of a long-lived magmatic system as indicated by variations in amphibole composition and textures in dacites erupted over 11 M.y. at the Aucanquilcha Volcanic Cluster, Central Andes, Chile

Giles, Denise E. L. (2009-12-24)

The Aucanquilcha Volcanic Cluster (AVC) is the erupted part of a magmatic system with a complex and long-lived history. The AVC lies at 21°S in the high Andes and is built on thick continental crust. The thick crust in t ...

Evolution and inheritance of Cascadia sub-arc mantle reservoirs

Bromley, Sarah Ashley (2011-07-22)

Inheritance from pre-existing mantle domains and fluid and melt contributions from active subduction together produce the geochemical signatures of mantle-derived arc basalts. In this context, this work evaluates the evo ...

Evolution of volcanism and hydrothermal activity in the Yanacocha Mining District, northern Perú

Longo, Anthony A. (2006-07-31)

The Yanacocha Mining District in northern Perú is considered the largest group of high-sulfidation style epithermal gold deposits in the world. District-scale geologic mapping coupled with detailed 40Ar/39Ar geochronolo ...

Geochronology of age-progressive volcanism of the Oregon High Lava Plains : implications for the plume interpretation of Yellowstone

Jordan, Brennan T.; Grunder, Anita L.; Duncan, Robert A.; Deino, Alan L. (American Geophysical Union, 2004-10-05)

The High Lava Plains province (HLP) is a late Cenozoic bimodal volcanic field at the northern margin of the Basin and Range province in southeastern Oregon that hosts a westward younging trend of silicic volcanism that ...

Geologic evolution of the Duck Creek Butte eruptive center, High Lava Plains, southeastern Oregon

Johnson, Jenda A. (1995-06-09)

Geology and geochemistry of Juniper Ridge, Horsehead Mountain and Burns Butte : implications for the petrogenesis of silicic magma on the High Lava Plains, southeastern Oregon

MacLean, James W. (1994-02-17)

The Juniper Ridge volcanic complex is located in the High Lava Plains Province of southeastern Oregon, a wide zone of bimodal volcanism and faulting that marks the northern limit of widespread Basin and Range-style fau ...

Geology and petrologic evolution of the silicic to intermediate volcanic rocks underneath Steens Mountain basalt, SE Oregon

Langer, Vera W. (1991-07-23)

Steens Mountain in SE Oregon is part of the northern Basin and Range Province, and represents a horst tilted about 100 to the west that is bounded to the east by a high angle, NNE trending normal fault. The minimum dis ...

Geology and petrology of a 26-Ma trachybasalt to peralkaline rhyolite suite exposed at Hart Mountain, southern Oregon

Mathis, Allyson C. (1993-03-10)

Interpreting a weird and scenic landscape to park visitors : tectonic and volcanic processes of Craters of the Moon National Monument and Preserve, Idaho

Truitt, Kimberly E. (2006-07-24)

This thesis develops a geology training manual for the Interpretation staff of Craters of the Moon National Monument and Preserve (CRMO) in southern Idaho. The manual will help the staff convey geologic principles to pa ...

Magma chamber processes over the past 475,000 years at Mount Hood, Oregon : insights from crystal zoning and crystal size distribution studies

Darr, Cristina M. (2007-01-30)

Several different petrological techniques have been applied to lava flows between 200 to 475,000 years old from Mount Hood, Oregon. Mount Hood is unusual, in comparison to nearby Mount St. Helens and Mount Jefferson, in ...

Meeting of the magmas : the evolutionary history of the Kalama Eruptive Period, Mount St. Helens, Washington

Lieuallen, Athena Erin (2010-10-14)

Comprehension of eruptive histories is critical in understanding the evolution of magmatic systems at arc volcanoes and may supply evidence to the petrogenesis of intermediate and evolved magmas. Within the 300 ka erupt ...

Partial melting of tonalite at the margins of a Columbia River Basalt Group dike, Wallowa Mountains, northeastern Oregon

Petcovic, Heather L. (2000-07-07)

Columbia River Basalt Group dikes cut the tonalite-granodiorite Wallowa Batholith in northeastern Oregon, providing a natural setting in which to examine partial melting. Many dikes have up to 5 m-wide zones of quenche ...

Petrology of the reversely zoned Mickey Pass Tuff, west-central Nevada

Templeton, Jeffrey H. (1998-09-03)

Re and Os isotopes of the central Oregon Cascades and along the arc indicate variable homogenization and mafic growth in the deep crust

Schmidt, Mariek E.; Grunder, Anita L.; Rowe, Michael C.; Chesley, John T. (Elsevier, 2013-02-14)

The rhenium-osmium isotopic system has the potential to track the maturation of arc crust at lower crustal levels because the ¹⁸⁷Os/¹⁸⁸Os in magmas is sensitive to the age and composition of crust with which they interac ...

Rhyolitic magmatism of the High Lava Plains and adjacent Northwest Basin and Range, Oregon : implications for the evolution of continental crust

Ford, Mark T., 1973- (2011-12-14)

Understanding continental crust formation and modification is a fundamental and longstanding geologic problem. Influx of mantle-derived basaltic magma and partial melting of the crust are two ways to drive crustal differ ...

Temporal and crustal effects on differentiation of tholeiite to calcalkaline and ferro-trachytic suites, High Lava Plains, Oregon, USA

Streck, Martin J.; Grunder, Anita L. (American Geophysical Union, 2012-11-06)

Strongly bimodal, basalt-rhyolite volcanism of the High Lava Plains Province of Oregon followed the Middle Miocene flood basalts of the Pacific Northwest and extends to recent time. During the 8 m.y. of volcanism recorde ...

Browsing by Author "Grunder, Anita L."

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