Strike-slip faulting terminates the Basin and Range province in Oregon

Lawrence, Robert D.

doi:10.1130/0016-7606(1976)87<846:sfttba>2.0.co;2

Cited by 143 publications

(152 citation statements)

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“…: AGE-PROGRESSIVE RHYOLITES OF OREGON 10.1002/ggge.20175 striking normal faults with offsets generally <10 m [Lawrence, 1976] (Figure 2). Large rangebounding normal faults of the Basin and Range gradually decrease in topographic and structural offset northward into the HLP (Figure 2).…”

Section: Physiographic and Tectonic Background Of The Hlp-nwbrmentioning

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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Section: Physiographic and Tectonic Background Of The Hlp-nwbrmentioning

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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“…[Walker, 1969[Walker, , 1977. This surface zone of normal faulting is inferred to overlie a deeper, right-lateral strike-slip fault zone [Lawrence, 1976] …”

Section: Volcanism Has Migrated West To Northwest In Parts Ofmentioning

confidence: 99%

Distribution of Late Cenozoic volcanic vents in the Cascade range: Volcanic arc segmentation and regional tectonic considerations

Guffanti¹,

Weaver²

1988

J. Geophys. Res.

144

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“…They are discontinuous; segments are a mile or less in length and may have been reactivated several times during the late Miocene to Pliocene. The northwest-trending faults parallel three major shear zones that cut the northem part of the Basin and Range, including the Brothers and Vale fault zones (Lawrence, 1976), and the DeLamar-Duck Valley structural trend Lawrence, 1976). The Vale fault zone is part of the northern is subparallel to the Brothers fault zone.…”

Section: G8mentioning

confidence: 99%

Mineral resources of the Blue Canyon and Owyhee Breaks Wilderness Study Areas, Malheur County, Oregon

Meulen¹,

Barlock²,

Plumley³

et al. 1990

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Strike-slip faulting terminates the Basin and Range province in Oregon

Cited by 143 publications

References 0 publications

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

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

Distribution of Late Cenozoic volcanic vents in the Cascade range: Volcanic arc segmentation and regional tectonic considerations

Mineral resources of the Blue Canyon and Owyhee Breaks Wilderness Study Areas, Malheur County, Oregon

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