The making of intermediate composition magma in a bimodal suite: Duck Butte Eruptive Center, Oregon, USA

Johnson, Jenda A.; Grunder, Anita L.

doi:10.1016/s0377-0273(99)00125-0

Cited by 31 publications

(34 citation statements)

References 24 publications

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“…Eruption location shifted to be concentrated around the nascent GoC rift. We therefore conclude the Comondú Group andesites are a larger-scale regional example of syn-volcanic extensional fault-driven magma mixing processes such as described by Johnson & Grunder (2000).…”

Section: Origin Of the Middle Miocene Comondú Andesitesmentioning

confidence: 51%

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Pulling apart the Mid to Late Cenozoic magmatic record of the Gulf of California: is there a Comondú Arc?

Bryan

Orozco-Esquivel

Ferrari

et al. 2013

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The composition of the lithosphere can be fundamentally altered by long-lived subduction processes such that subduction-modified lithosphere can survive for hundreds of millions of years. Incorrect petrotectonic interpretations result when spatial-temporal-compositional trends of, and source contributions to, magmatism are not properly considered. Western Mexico has had protracted Cenozoic magmatism developed mostly in-board of active oceanic plate subduction beneath western North America. A broad range of igneous compositions from basalt to high-silica rhyolite were erupted with intermediate to silicic compositions in particular, showing calc-alkaline and other typical subduction-related geochemical signatures. A major Oligocene rhyolitic ignimbrite 'flare-up' (.300 000 km 3

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Section: Origin Of the Middle Miocene Comondú Andesitesmentioning

confidence: 51%

“…Gans et al 1989;Axen et al 1993), such that intermediate magma compositions can be promoted by active extensional faulting (e.g. Johnson & Grunder 2000).…”

mentioning

confidence: 99%

Pulling apart the Mid to Late Cenozoic magmatic record of the Gulf of California: is there a Comondú Arc?

Bryan

Orozco-Esquivel

Ferrari

et al. 2013

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“…[4] Since the original reconnaissance mapping surveys of Russell [1884Russell [ , 1905, there has been persistent interest in the igneous rocks and tectonics of the HLP-NWBR region [e.g., Williams, 1935;Green, 1973;Wells, 1979;Carlson and Hart, 1987;Draper, 1991;Johnson and Ciancanelli, 1984;Johnson and Grunder, 2000;Jordan et al, 2004;Boschmann, 2012]. Much of the work over the past three decades is contained in university student theses with a few specific areas receiving concentrated study (e.g., Glass Buttes).…”

Section: Physiographic and Tectonic Background Of The Hlp-nwbrmentioning

confidence: 99%

“…The silicic rocks of Drake Peak (Figure 3), located in the NWBR, are likewise estimated to have a volume of 25-50 km 3 (based on cross sections of Wells [1979]). Other centers are intermediate in size, including the Duck Butte Eruptive Center, which is estimated to be 7 km 3 [Johnson and Grunder, 2000] and Juniper Ridge (Figure 3), which is conservatively estimated to be 3 km 3 [Maclean, 1994]. The total volume of silicic domes and flows is estimated to be 120-250 km 3 .…”

Section: Rhyolite Volumementioning

confidence: 99%

Bimodal volcanism of the High Lava Plains and Northwestern Basin and Range of Oregon: Distribution and tectonic implications of age‐progressive rhyolites

Ford

Grunder

Duncan

2013

Geochem Geophys Geosyst

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[1] Multiple episodes of Oligocene and younger silicic volcanism are represented in the high lava plateau of central and southeastern Oregon. From 12 Ma to Recent, volcanism is strongly bimodal with nearly equal volumes of basalt and rhyolite. It is characterized by moderate to high silica (SiO 2 >72 wt. %) rhyolitic tuffs and domes that are younger to the west, and widespread, tholeiitic basalts that show no temporal pattern. We report 18 new 40 Ar/ 39 Ar incremental heating ages on rhyolites, and establish that the timing of the age-progressive rhyolites is decoupled from basaltic pulses. This work expands on that of previous workers by clearly linking the High Lava Plains (HLP) and northwestern-most Basin and Range (NWBR) rhyolite volcanism into a single age-progressive trend. The spatial-temporal relationship of the rhyolite outcrops and regional tectonics indicate that subsidence due to increasingly dense crust creates large, primarily sediment-filled basins within the more volcanically active HLP. The westnorthwest age progression in rhyolitic volcanism is counter to the trend expected for a quasi-stationary mantle upwelling relative to North American plate motion. We attribute the rhyolitic age progression to mantle upwelling in response to slab rollback and steepening, and this is consistent with mantle anisotropy under the region and analog slab rollback models. This removes the necessity of deep mantle plume involvement. Laboratory experimental studies indicate that the geometry of the downgoing slab can focus upwelling or asthenospheric counterflow into a constricted band, resulting in greater volcanic volumes in the HLP as compared to the NWBR.

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“…Based on estimates of aerial extents and thicknesses, mafic rocks and rhyolites are subequal in volume on the High Lava Plains. Intermediate compositions are scarce and, where they occur, are mainly simple mixtures of mafic and rhyolitic magmas (Linneman and Myers, 1990;Streck and Grunder, 1999;Johnson and Grunder, 2000). Among several ignimbrites that erupted from vents along the High Lava Plains the 9.7 Ma Devine Canyon Tuff and the 7.1 Ma Rattlesnake Tuff stand out by their extreme distribution area; each covering an area in excess of 20,000 km 2 (Green and others, 1973;Streck and Grunder, 1995;Wacaster and others, 2011) representing about 300 cubic kilometers (km 3 ) of mostly high-silica, rhyolitic, metaluminous to peralkaline magma (Greene, 1973;Streck andGrunder, 1995, 1997;Wacaster and others, 2011).…”

Section: Regionally Widespread Late Miocene Ash-flow Tuffs Of the Higmentioning

confidence: 99%

Field-trip guide to Columbia River flood basalts, associated rhyolites, and diverse post-plume volcanism in eastern Oregon

Ferns¹,

Streck²,

McClaughry³

2017

Scientific Investigations Report

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The making of intermediate composition magma in a bimodal suite: Duck Butte Eruptive Center, Oregon, USA

Cited by 31 publications

References 24 publications

Pulling apart the Mid to Late Cenozoic magmatic record of the Gulf of California: is there a Comondú Arc?

Pulling apart the Mid to Late Cenozoic magmatic record of the Gulf of California: is there a Comondú Arc?

Bimodal volcanism of the High Lava Plains and Northwestern Basin and Range of Oregon: Distribution and tectonic implications of age‐progressive rhyolites

Field-trip guide to Columbia River flood basalts, associated rhyolites, and diverse post-plume volcanism in eastern Oregon

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