2 edition of Major- and trace-element analyses of Steens Basalt, southeastern Oregon found in the catalog.
Major- and trace-element analyses of Steens Basalt, southeastern Oregon
by U.S. Dept. of the Interior, U.S. Geological Survey in [Hawaii Volcanoes National Park, HI]
Written in English
|Other titles||Major and trace element analyses of Steens Basalt, southeastern Oregon.|
|Statement||by Jenda A. Johnson ... [et al.].|
|Series||Open-file report -- 98-482., U.S. Geological Survey open-file report -- 98-482.|
|Contributions||Johnson, Jenda A., Geological Survey (U.S.)|
|The Physical Object|
|Number of Pages||30|
Jun 20, · The Santa Rosa–Calico volcanic field (SC) of northern Nevada is a complex, multi-vent mid-Miocene eruptive complex that formed in response to regional lithospheric extension and flood basalt volcanism. Santa Rosa–Calico volcanism initiated at ∼ Ma, concurrent with regional Steens–Columbia River flood basalt activity and is characterized by a complete compositional Cited by: STEENS MOUNTAIN BASALT (continued) AGE RELATIONSHIP. From fossil leaves, the Upper Cedarville Beds beneath the Warner Basalt were considered by Chaney 18 to correlate with the Mascall Formation overlying the Columbia River Basalt in the John Day Valley. They were, therefore, thought to be of Middle Miocene age.
Browse all of the USGS publications warehouse by following a link tree. Skip to main content. An official website of the United States government Browse the USGS Publication Warehouse Publications in the Series Open-File Report. Major- and trace-element analyses of Steens Basalt, southeastern Oregon, , Open-File Report Jun 20, · Read "Phenocryst-poor rhyolites of bimodal, tholeiitic provinces: the Rattlesnake Tuff and implications for mush extraction models, Bulletin of Volcanology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Mar 15, · Read "Distribution and geochronology of Oregon Plateau (U.S.A.) flood basalt volcanism: The Steens Basalt revisited, Journal of Volcanology and Geothermal Research" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Basaltic volcanism and tectonics of the High Lava Plains, southeastern Oregon. By. Download PDF (7 MB) Laser fusion 40Ar /39Ar dating of the type locality Steens Basalt, southeast Oregon, and age of the Steens geomagnetic polarity transition [abs.]: XRF analysis of rocks and minerals for major and trace elements on a single low.
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Major- and trace-element analyses of Steens Basalt, southeastern Oregon. Major- and trace-element analyses of Steens Basalt, southeastern Oregon: Series title: Open-File Report: Series number: DOI: /ofr Edition-Year Published: Language.
Get this from a library. Major- and trace-element analyses of Steens Basalt, southeastern Oregon. [Jenda A Johnson; Geological Survey (U.S.);] -- "This report presents major- and trace-element analyses of 85 lava flows and dikes collected from the Steens Basalt at Steens Mountain, Oregon".
This report presents major- and trace-element analyses of 85 lava flows and dikes collected from the Steens Basalt at Steens Mountain, Oregon (fig.
The Ma Steens Basalt is a laterally continuous unit of lava flows exposed throughout much of southeastern OregonCited by: The Steens Formation, or Steens Basalt, is formally recognized as the oldest lithostratigraphic unit of the Columbia River Basalt Group, with an estimated areal extent and volume of 53, km 2 and 31, km 3, shareholderdemocracy.com integrate petrochemical, paleomagnetic, and 40 Ar Ar age data on 13 collected sections to help evaluate stratigraphic and petrogenetic relationships through the.
Nov 27, · This study focuses on Middle Miocene tholeiitic flood basalt lava flows from the Oregon Plateau, northwestern USA (Steens Basalt), and is the first to comprehensively document and evaluate their shareholderdemocracy.com by: A few basaltic flows resembling the Steens Mountain type occur both at the base and near the top of the series.
Acidic lavas about feet in thickness lie in the intervening space. The upper basalt beneath a thin cap of glassy acidic lava consists of three flows varying in thickness from 5 to 10 feet. Stratigraphic and chemical correlations of Tertiary volcanic units in eastern Oregon confirm that the Steens Basalt represents the earliest eruptions of the Columbia River flood-basalt province.
Field correlations are supported by major and trace element analyses and confirmed by 40Ar/39Ar dates. For field details of Steens basalt samples, see Johnson et al (). For field details of Imnaha, Grande Ronde and Picture Gorge basalt samples see Appendix A of Hooper ().
All data new to this study are presented by formation in the Supplementary Information 2. For the Grande Ronde and Picture Gorge basalts, new trace element. Furthermore, major and trace element geochemistry and petrography link regionally exposed Oregon Plateau lava flows with at least the upper package of Steens Basalt exposed at Steens Mountain.
Collectively, the lava flows in question are generally relatively thin and are characterized by a lack of interflow sediments, aphyric to coarsely plagioclase phyric textures, and mid-Miocene eruptive Cited by: The map area lies in eastern Oregon, midway between the Harney Basin to the west and the Oregon-Idaho graben to the east.
It separates the tholeiitic basalt exposures of Steens Mountain to the south from the canyon-land exposures of the basalt of Malheur Gorge to the north. the Steens Mountain in SE Oregon, a major basin-range fault scarp provides almost m of relief over the Alvord Desert, exposing one of the world’s thickest single exposure of Tertiary basalt (Johnson et al., ).
Two distinct sets of Steens Basalt, collectively comprised of over. Steens Mountain. Furthermore, major and trace element geochemistry and petrography link regionally exposed Oregon Plateau lava flows with at least the upper package of Steens Basalt exposed at Steens Mountain.
Collectively, the lava flows in question are generally relatively thin and are characterized by a lack of. Takes you on an exploration of Steens Mountain of Oregon, and the county in which it stands - Harney County, a county larger than any one of eight eastern states, a big lonesome land more than ten thousand square miles in area, in the sparsely settled semidesert of southeastern Oregon/5(8).
The Steens Mountain (Oregon) Geomagnetic Polarity Transition: 3. Study of the variations of direction and intensity of the geomagnetic field as recorded by the Miocene lava flows on Steens Mountain, southeastern Oregon, has resulted in a detailed description of total field behavior during a reversal in polarity.
are made of. Moderate-Rate Migrations after the Flood-Basalt Event. Flood-basalt volcanism was followed by the progressive eruption of rhyolite along two well-recognized trends (Figure 3): to the northeast, along the Snake River Plain hotspot track, and to the west-northwest.
Steens Mountain Volcanics (OR; formerly OR and OR) consists of hornblende- and pyroxene-hornblende-bearing andesite flows, flow breccia and pyroclastic rocks. One of the andesite flows was dated at 19+ Ma (OR). Basaltic andesite at the top of Steens Mountain Volcanics was dated at 23+ Ma (OR).
Quicksilver Deposits of Steens Mountain and Pueblo Mountains, Southeast Oregon: Usgs Bulletin B [Howel Williams, Robert R. Compton] on shareholderdemocracy.com *FREE* shipping on qualifying offers. The United States Geological Survey (USGS) is a scientific organization created inand is part of the U.S.
government. Their scientists explore our environment and ecosystems. Drive the highest road in Oregon to viewpoints of mile-high cliffs and canyons in the desert.
About the Hike: Three short paths lead to viewpoints of Kiger Gorge, the East Rim, and Steens Summit. A longer trail descends to Wildhorse Lake, in a treeless bowl of wildflowers.
Sep 26, · New whole-rock major and trace element analyses clarify the chemical distinctions between lower A, lower B, and upper Steens Basalt, with a zig-zagging pattern of generally less magnesian and more incompatible trace element enriched compositions at the base (lower A Steens Basalt) and the top (upper Steens Basalt) of the section, but more magnesian and incompatible trace Cited by: 2.
Steens Mountain (’) is a large mountain in southeast Oregon that has characteristics of two major geologic provinces that overlap in this area—the Basin and Range Province to the south and the Columbia River Basalt Province to the north. The mountain is formed from a large fault block of basalt that has been uplifted and tilted to the.
Rocks older than the Steens Basalt in southeastern Oregon are mainly exposed in prominent fault scarps such as Steens Mountain, Hart Mountain, and Abert Rim. At Hart Mountain, the section consists of a suite of trachybasalt to trachyte to peralkaline rhyolite lava flows and tufts.
The Hart Mountain volcanic complex contains the only known.Aug 17, · The preponderance of data appears to support a mantle plume origin for flood‐basalt volcanism of the Columbia River Basalt Group and for bimodal volcanism along the Yellowstone‐Snake River Plain hot spot track.
The earliest manifestation of plume arrival was the eruption of Steens Basalt in southeastern Oregon at ca. Ma [Camp et al Cited by: 1. Initial eruptions of Steens basalt began in southeastern Oregon during a reverse paleomagnetic interval (R 0).
Steens lavas continued to erupt through a magnetic transition, generating normally magnetized lavas (N 0) which appear to have their greatest thickness at the presumed shield volcano of Steens Mountain [ Mankinen et al., ].Cited by: