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• Brothers_Fault_Zone abstract "The Brothers Fault Zone (BFZ)—believed to have been named after Brothers, Oregon—is the most notable of a set of northwest trending fault zones including the Eugene–Denio, McLouglin, and Vale zones that dominate the geological structure of most of Oregon. These are also representative of a regional pattern of generally northwest striking geological features ranging from Walker Lane on the California–Nevada border to the Olympic–Wallowa Lineament in Washington; these are generally associated with the regional extension and faulting of the Basin and Range Province, of which the BFZ is considered the northern boundary.The relationships with other features is complex. At the BFZ's eastern end, near the Steens Mountain fault, the zone of surface faulting turns slightly to the south-southeast (possibly due to rotation of Nevada), then follows the Northern Nevada Rift to form the Oregon–Nevada lineament, with a total length of over 75 km (47 mi). Lavas associated with the Nevada Rift have been dated to 16.3 Ma (millions of years ago), close to the inception of basin-and-range faulting, but there is a suspicion that the rifting developed on an older strike-slip fault, possibly connected with the East Pacific Rise.At its west end, just past the Newberry Volcano, the BFZ terminates at the north-striking Sisters Fault, part of the High Cascades geological province. But further south the Pliocene (<5 Ma) High Cascades volcanic trend is offset right-laterally about 10 to 20 km (6.2 to 12.4 mi) by the Eugene–Denio fault zone, and another 15 to 20 km (9.3 to 12.4 mi) by the McLouglin zone.At a possibly more fundamental level, the Brothers, Eugene–Denio, and McLouglin zones, and possibly the Vale zone, all terminate near the Klamath – Blue Mountains Lineament (KBML; shortened and slightly misplaced on the map at right). The KBML is a prominent, 700 km (430 mi) long southwest-to-northeast-striking gravitational anomaly that crosses all of Oregon. It coincides with the southern boundary of the Columbia Embayment (the Olympic–Wallowa Lineament in Washington being the northern boundary), a region noticeably lacking in pre-Tertiary bedrock. Aside from aligning with the northwestern edge of several terranes that have accreted to the North American continent (such as the Klamath Mountains on the southern coast of Oregon, and Blue Mountains Province just north of the BFZ), the KBML has no apparent surface manifestation; it is believed to reflect a deeper structure, possible a pre-Tertiary continental margin.The BFZ is the northern edge of the Basin and Range Province, a region of northwest directed extension, wherefore the BFZ also accommodates the offset with the Blue Mountains Province. It does this not by through-going strike-slip faulting (such as with the San Andreas fault to the southwest) but by a series of hundreds of en echelon normal faults somewhat crosswise to the zone itself. Such faulting is believed to be the surface manifestation of a deeper sheer zone.The Brothers Fault Zone is also the locus of the High Lava Plains (HLP) volcanism of central and southeastern Oregon. HLP volcanism is notable for showing an age progression from 16 Ma from its eastern end (near the Oregon–Nevada–Idaho corner) to a mere 1 Ma young Newberry Volcano at its western end. This age progression mirrors the very similar progression along the track of the Yellowstone Hotspot, which appears to have a common origin. Also closely related in space and time is the eruption of the 16.6 Ma Steens Basalts, the initial and most voluminous phase of the Columbia River Basalt Group lava flows that blanket eastern Oregon and the entire southeastern quarter of Washington. These also show a similar age progression to the north; there is a great deal of debate on how all of these are related, and how they initiated. The track of the Yellowstone Hotspot is neatly explained by motion of the North American craton over a plume (hotspot) of material rising from the mantle. But this explanation fails for the so-called "Newberry hotspot" track, as it lies oblique to the motion of the craton. One suggestion is that the large blob of molten rock at the head of the plume was sheared off by the advancing edge of the craton, and remained entrained in front of the craton to melt the lithosphere in a broad region, while the tail of the plume was overrun to make the Yellowstone Hotspot track. Age progressive volcanism along the Brothers Fault Zone (as well as the Steens Fault and North Nevada Rift) results from the expanding lithospheric melt opportunistically exploiting existing crustal faults.In summary, the Brothers Fault Zone (and the related Eugene–Denio, McLouglin, and Vale zones) appears to be a deep seated structure in accreted terranes bounded by the Klamath — Blue Mountains Lineament, which has been reactivated by Basin and Range extension, and exploited by mid-Miocene vulcanism connected with the Yellowstone Hotspot.".
• Brothers_Fault_Zone length "257495.04".
• Brothers_Fault_Zone location Newberry_Volcano.
• Brothers_Fault_Zone location Steens_Mountain.
• Brothers_Fault_Zone state Oregon.
• Brothers_Fault_Zone thumbnail Geofeatures-PacificNW.png?width=300.
• Brothers_Fault_Zone width "80467.2".
• Brothers_Fault_Zone wikiPageExternalLink qf_web_disp.cfm?qfault_or=1665.
• Brothers_Fault_Zone wikiPageExternalLink Camp%20and%20Hanan_2008.pdf.
• Brothers_Fault_Zone wikiPageExternalLink scarberry_etal2009.pdf.
• Brothers_Fault_Zone wikiPageExternalLink JordanetalJGR.pdf.
• Brothers_Fault_Zone wikiPageExternalLink VicCampCRBMag.pdf.
• Brothers_Fault_Zone wikiPageExternalLink PNNL-15221.pdf.
• Brothers_Fault_Zone wikiPageExternalLink RiddihoughKB86.pdf.
• Brothers_Fault_Zone wikiPageID "26443413".
• Brothers_Fault_Zone wikiPageRevisionID "603743503".
• Brothers_Fault_Zone categoryHide "1".
• Brothers_Fault_Zone country "United States".
• Brothers_Fault_Zone hasPhotoCollection Brothers_Fault_Zone.
• Brothers_Fault_Zone imageCaption "Major geological structures in Washington and Oregon: BFZ – Brothers Fault Zone; EDFZ – Eugene–Denio Zone; MFZ – McLouglin Zone; NR – Northern Nevada Rift; SM – Steens Mountain and fault; OIG – Oregon–Idaho Grabens; HB – Harney Basin; NC – Newberry Caldera; KBML – Klamath – Blue Mountain Lineament. Light green indicates extent of Columbia River Basalt Group flows; orange line indicates juncture of North American craton and accreted terranes. The Vale fault zone is in the northeast corner of Oregon, near the Olympic–Wallowa Lineament .".
• Brothers_Fault_Zone imageSize "300".
• Brothers_Fault_Zone latD "43".
• Brothers_Fault_Zone latM "48".
• Brothers_Fault_Zone latNs "N".
• Brothers_Fault_Zone latS "49".
• Brothers_Fault_Zone lengthImperial "160".
• Brothers_Fault_Zone lengthOrientation "SE–NW".
• Brothers_Fault_Zone location "Between Steens Mountain and Newberry Volcano , approximately".
• Brothers_Fault_Zone longD "120".
• Brothers_Fault_Zone longEw "W".
• Brothers_Fault_Zone longM "36".
• Brothers_Fault_Zone longS "12".
• Brothers_Fault_Zone name "Brothers Fault Zone".
• Brothers_Fault_Zone state "Oregon".
• Brothers_Fault_Zone widthImperial "50".
• Brothers_Fault_Zone widthOrientation "SW–NE".
• Brothers_Fault_Zone subject Category:Geology_of_Oregon.
• Brothers_Fault_Zone subject Category:Seismic_faults_of_the_United_States.
• Brothers_Fault_Zone point "43.81361111111111 -120.60333333333334".
• Brothers_Fault_Zone type Abstraction100002137.
• Brothers_Fault_Zone type Act100030358.
• Brothers_Fault_Zone type Event100029378.
• Brothers_Fault_Zone type Mistake100070965.
• Brothers_Fault_Zone type Nonaccomplishment100066216.
• Brothers_Fault_Zone type PsychologicalFeature100023100.
• Brothers_Fault_Zone type SeismicFaultsOfTheUnitedStates.
• Brothers_Fault_Zone type YagoPermanentlyLocatedEntity.
• Brothers_Fault_Zone type Place.
• Brothers_Fault_Zone type Wikidata:Q532.
• Brothers_Fault_Zone type Place.
• Brothers_Fault_Zone type Location.
• Brothers_Fault_Zone type _Feature.
• Brothers_Fault_Zone comment "The Brothers Fault Zone (BFZ)—believed to have been named after Brothers, Oregon—is the most notable of a set of northwest trending fault zones including the Eugene–Denio, McLouglin, and Vale zones that dominate the geological structure of most of Oregon.".
• Brothers_Fault_Zone label "Brothers Fault Zone".
• Brothers_Fault_Zone sameAs m.0bbv425.
• Brothers_Fault_Zone sameAs Q4975666.
• Brothers_Fault_Zone sameAs Q4975666.
• Brothers_Fault_Zone sameAs Brothers_Fault_Zone.
• Brothers_Fault_Zone lat "43.81361111111111".
• Brothers_Fault_Zone long "-120.60333333333334".
• Brothers_Fault_Zone wasDerivedFrom Brothers_Fault_Zone?oldid=603743503.
• Brothers_Fault_Zone depiction Geofeatures-PacificNW.png.
• Brothers_Fault_Zone isPrimaryTopicOf Brothers_Fault_Zone.
• Brothers_Fault_Zone name "Brothers Fault Zone".