Petrology of Newberry Volcano, Central Oregon

Higgins, Michael W.

doi:10.1130/0016-7606(1973)84<455:ponvco>2.0.co;2

Cited by 58 publications

(39 citation statements)

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“…Theses by Sutton (1974) on Mount Jefferson and Davie (1980) on Three Fingered Jack include large-scale geologic maps of these important High Cascade cones. Williams' (1935Williams' ( , 1957 and Higgins' (1973) data for Newberry caldera have been recently supplemented by detailed mapping of the volcano by MacLeod (1978a,b), MacLeod and Sherrod (1979), and MacLeod and others (1982).…”

Section: Figure 21 Map Showing the Physiographicprovinces Ofmentioning

confidence: 99%

Geology and geothermal resources of the central Oregon Cascade Range. Special Paper 15

Priest¹,

Vogt²

1983

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Section: Figure 21 Map Showing the Physiographicprovinces Ofmentioning

confidence: 99%

Geology and geothermal resources of the central Oregon Cascade Range. Special Paper 15

Priest¹,

Vogt²

1983

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“…Newberry Volcano in central Oregon is located in the Cascade backarc at the intersection of three major tectonic systems: the northeast trending Walker Rim fault zone of the westernmost Basin and Range province, the northwest trending Sisters fault zone, and the Cascade magmatic arc, and is close to the Brothers Fault Zone that delineates the northern boundary of Basin and Range extension (Higgins, ; Hildreth, ), as shown in Figure . The Newberry volcanic system is a broad shield volcano located 50 km east of the main Cascades arc.…”

Section: Introductionmentioning

confidence: 99%

Composition of Magma and Characteristics of the Hydrothermal System of Newberry Volcano, Oregon, From Magnetotellurics

Bowles-martinez

Schultz

2020

Geochem Geophys Geosyst

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We use 3‐D magnetotellurics to improve our understanding of the structure and magma composition of Newberry Volcano in Oregon, USA. Newberry is a broad shield volcano with a summit caldera and strongly bimodal magmatism. Newberry has long been the subject of geothermal exploration research, but that work has focused on the volcano's west flank, leaving the caldera largely unstudied with geophysical methods until recently. Our modeling shows a relatively resistive magma reservoir of approximately 50 Ωm. Our work builds upon recent seismic models and petrological analysis to interpret Newberry's magma reservoir as a dry rhyolite with 8–11% partial melt, which matches the seismically determined melt fraction. Finding the conditions within the magma reservoir that allow the resistivity and seismic analysis to come to the same melt fraction helps us narrow down the magma temperature and composition. From this we infer a dry rhyolitic magma at 850 °C. We also image a prominent vertical conductive anomaly along the south rim below the vent that produced the most recent eruption. The anomaly extends from magma reservoir depths of 3 km to 1 km below the surface where it disperses into the caldera fill. We interpret this as the main conduit for magmatic fluids to reach Newberry's hydrothermal system. Other features that our model shows include higher conductivity along the caldera rim and a resistive older pluton on the west flank.

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“…Newberry has a shadow zone 12 km wide within which basaltic vents are absent but outside which they are abundant. The volcano has an estimated volume of 450 km 3 and erupted six times in the Holocene (Higgins 1973;Chitwood 1990).…”

Section: Examples Of Central Volcanoesmentioning

confidence: 99%

Basaltic-volcano systems

Walker

1993

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This review and personal account of basaltic volcanism concentrates on the geological aspects and physical controls, unlike most others which concentrate on geochemistry. It serves as an update to reviews by Wentworth & Macdonald 20 to 40 years ago. The concept of volcanic systems is developed, a system including the plumbing, intrusions, and other accoutrements of volcanism, as well as the volcanic edifice. Five types of systems are described, namely lava-shield volcanoes, stratovolcanoes, flood-basalt fields, monogenetic-volcano fields, and central volcanoes (having silicic volcanics as well as basaltic). It is postulated that the system-type depends on (a) the magma-input rate and (b) the frequency with which magma-batches enter the system (or modulation frequency). These controls determine whether a hot pathway is maintained from the source to the high-level magma chamber, and hence if eruptions are concentrated in the central-vent system. Reviews are given on many aspects: the different kinds of rift zones that volcanoes exhibit, and their controls; the mostly small intrusions, including coherent-intrusion complexes, that occur in and under the volcanic edifices; the great sill swarms that are an alternative to flood basalts; the origin of the craters and calderas of basaltic volcanoes; high-level magma chambers, their locations, and cumulate prisms; the positive Bouguer gravity anomalies that are attributed to cumulates and intrusion complexes; the structures of basaltic lava flows; the characteristics of basaltic explosive volcanism and the consequences of participation by nonvolcanic water; the products of underwater volcanism; the origin and significance of joints, formed either by contraction or expansion, in volcanic rocks; and the distribution of vesicles in basaltic rocks. A fairly extensive bibliography is included. This is in part a review; it takes stock of changes in concepts since the publications by Wentworth & Macdonald (1953) and Macdonald (1967), which were models of clear description of basaltic volcanics, and since the publication 12 years ago of the landmark Basaltic Volcanism Study Project (1981). It also incorporates new ideas, new interpretations, and new ways of looking at the subject. The scope of basaltic volcanism is too broad to cover all aspects, and petrology and geochemistry are specifically omitted.More than half of the world's volcanoes are basaltic or include basalt among their products; and about one third of known eruptions, involving about 20 volcanoes per year erupt basaltic magma. Basaltic volcanoes occur in all tectonic settings. Basaltic volcanism is associated with both divergent and convergent plate boundaries; it characterizes spreading ridges mostly concealed beneath the ocean; it characterizes hotspot volcanism which, in oceanic settings, is almost exclusively basaltic and, in continental settings, is commonly bimodal (basaltic plus rhyolitic); and it is widespread associated with andesitic and more silicic magmas in subduction-zone settings, particula...

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Petrology of Newberry Volcano, Central Oregon

Cited by 58 publications

References 0 publications

Geology and geothermal resources of the central Oregon Cascade Range. Special Paper 15

Geology and geothermal resources of the central Oregon Cascade Range. Special Paper 15

Composition of Magma and Characteristics of the Hydrothermal System of Newberry Volcano, Oregon, From Magnetotellurics

Basaltic-volcano systems

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