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Sunday, July 26, 2020 | History

4 edition of Petrology of Late Eocene lavas erupted in the forearc of central Oregon found in the catalog.

Petrology of Late Eocene lavas erupted in the forearc of central Oregon

Petrology of Late Eocene lavas erupted in the forearc of central Oregon

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Published by U.S. Dept. of the Interior, U.S. Geological Survey in Menlo Park, Calif .
Written in English

    Subjects:
  • Volcanism -- Oregon -- Yachats Region,
  • Geology, Stratigraphic -- Eocene

  • Edition Notes

    StatementA.S. Davis ...[et al.]
    SeriesOpen-file report -- 95-40, U.S. Geological Survey open-file report -- 95-40
    ContributionsDavis, A. S, Geological Survey (U.S.)
    The Physical Object
    FormatMicroform
    Pagination1 v
    ID Numbers
    Open LibraryOL14483046M
    OCLC/WorldCa39144109

    "Early Pliocene-Late Miocene basaltic rocks and their implications for crustal structure, northeast California and south-central Oregon." Geol. Soc. Am. Bull. 94, p. , Dixon, T. H., and Stern, R. J. "Petrology and geochemistry of submarine volcanoes in the Southern Mariana Arc.". Chengcheng Ye, Yibo Yang, Xiaomin Fang and Weilin Zhang, Late Eocene clay boron-derived paleosalinity in the Qaidam Basin and its implications for regional tectonics and climate, Sedimentary Geology, /, , (), ().

    Parker DF, Hodges FN, Perry A, Mitchener ME, Barnes MA, Ren M () Geochemistry and petrology of late Eocene Cascade Head and Yachats Basalt and alkalic intrusions of the central Oregon Coast Range, U.S.A. J Volcanol Geoth Res – doi: . Eruption of middle Eocene-lower Oligocene boninites and island arc tholeiites created the km wide Izu-Bonin arc massif following the initiation of subduction {approximately}50 Ma. Mid-Oligocene rifting formed a km wide forearc basin between the Eocene outer-arc high and the Eo-Oligocene arc (now the frontal arc high), with maximum.

    Clara Phipps (Class of ). “ Petrology of the Eocene Goble Volcanics, Southwest Washington: A Record of the Transition from Oceanic to Cascade Arc Magmatism ”. The Goble Volcanics lie west of the main Cascade arc but east of the oceanic basalts of the Coast Range. Clara found that this formation consists of two suites of lavas: an earlier group of high alumina olivine tholeiites and a. Geology, Petrology and Volcanic History os a portion of the Cascade Range between latitudes 43° - 44° N, central Oregon, U.S.A. Geology of the Fishhawk Falls-Jewel area, Clatsop County, Oregon Petrology of the Bend pumice and Tumalo tuff, a pleistocene Cascade eruption involving magma mixing.


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Petrology of Late Eocene lavas erupted in the forearc of central Oregon Download PDF EPUB FB2

Petrology of Late Eocene Lavas Erupted in the Forearc of Central Oregon A.S. Davis, P.D. Snavely, Jr., L.B. Gray, and D.L. Minasian Open-File Report This report is preliminary and has not been reviewed for conformity with U.S.

Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, orCited by: 5. Get this from a library.

Petrology of Late Eocene lavas erupted in the forearc of central Oregon. [Alicé Davis; Geological Survey (U.S.);]. Petrology of late Eocene lavas erupted in the forearc of central Oregon Open-File Report By: A.S.

Davis, P.D. Snavely, Leda-Beth Gray, and D.L. Minasian. Geochemistry and petrology of late Eocene Cascade Head and Yachats Basalt and alkalic intrusions of the central Oregon Coast Range, U.S.A Oregon forearc magmatism.

The Oregon and Washington forearc region experienced significant, fundamentally basaltic, magmatism in the mid Cenozoic (Duncan and Kulm, ).This magmatism produced the Yachats and Cascade Head series of the central Oregon coast range (Snavely and MacLeod,Davis et al., ), the Tillamook Volcanics of the northern Oregon Coast Range (Snavely et al., Cited by: 9.

The John Day Basin of central Oregon contains a remarkably detailed and well-dated Early Eocene–Late Miocene sedimentary sequence, known for its superb fos-sils. The third cycle perhaps overlapped the second, beginning about Ma with eruption of rhyolitic lavas and related tuffs around a growing annular fissure system encircling central Yellowstone.

The BSC is overlain by the late Eocene–Oligocene Ohanapecosh Formation, a voluminous package of subaerial and subaqueous tuffs and andesitic flows that range in age from 36 to 28 Ma and are interpreted as an early expression of the Tertiary Cascade arc (Vance et al., ). basaltic andesites erupted from a cluster east of Oregon City at Ma, and lavas with OIB-like compositions erupted from three or four centers north of Beacon Rock (Fig.

3) at ca. 1 Ma. INTRODUCTION. Establishing the processes and controls on the generation of magmas with SiO 2 content in excess of 65 wt % (hereafter referred to as ‘silicic’) remains a major challenge of igneous petrology.

In particular, the origin of rhyolites, which are typically the most crystal-poor, despite being the most viscous silicate liquids that the Earth produces, remains elusive.

However, in central and eastern Anatolia, their presence is restricted to the region of Konya where coeval, middle to late Miocene minette-type lamprophyres and high-K calc-alkaline lavas coexist.

Understanding the events in the Neuquén Basin requires taking a broader view of late Oligocene–early Miocene magmatism and forearc, intra-arc, and backarc basin formation in the south-central Andes (region between 33°S and 45°S in Fig. The relative motion of South American–Pacific oceanic plate interactions and the motion of the.

At present, age constraints on boninites in the Tonga region are restricted to 0 to Ma in the northern Lau Basin [Falloon et al., ], Ma at dredge (this study) and late Eocene (minimum) from Fiji [Todd et al., ] so it is likely that some of the boninites from the Tonga fore arc will have been erupted during the early history.

Bin Zhang, Jiaqi Liu, Wen Chen, Zeyang Zhu, Chunqing Sun, Late Eocene magmatism of the eastern Qiangtang block (eastern Tibetan Plateau) and its geodynamic implications, Journal of Asian Earth Sciences, /, (), ().

Arc migration and erosion during this most recent period may have been expedited by either the subduction of the Kula Ridge, which ceased spreading in the early Eocene, or clockwise rotation of the Pacific plate in the late Miocene. Some central Aleutian lavas and plutonic rocks have elevated La/Yb, Sm/Yb, and Sr/Yb, most of which were emplaced.

It may also be possible to trace the hotspot to earlier times than the mid-Miocene. It has been suggested that late Paleocene/ early Eocene seamount volcanic rocks of the Oregon and Washington Coast Range were erupted from the Yellowstone hotspot [38], and that subaerial late Eocene volcanism was produced by this hotspot [39,40].

The eruption of camptonite flows and intrusion of nepheline syenite in the central Oregon Coast Range at Ma were approximately contemporaneous with the eruption of the Cascade Head volcanics at Ma, and the flows appear to be lesser partial melts of the Cascade Head and Yachats sources (Oxford, ; Parker et al., ).

Abstract. An 40 Ar/ 39 Ar age of 451 Ma determined for lavas from northern Saipan confirms that these high-silica rhyolites erupted during the ‘proto-arc’ stage of volcanism in the Izu–Bonin–Mariana system, which is characterized elsewhere by eruption of boninitic lavas.

Incompatible trace element concentrations and Sr, Hf, Nd, and Pb isotope ratios for these rhyolites are. Nusret Nurlu, Petrology and LA-ICP-MS zircon geochronology for Late Cretaceous felsic dikes and intermediate volcanic rocks hosted in Mersin ophiolite, South Turkey and its implications, Geosciences Journal, /s, ().

At present, age constraints on boninites in the Tonga region are restricted to 0 to Ma in the northern Lau Basin [Falloon et al., ], Ma at dredge (this study) and late Eocene (minimum) from Fiji [Todd et al., ] so it is likely that some of the boninites from the Tonga fore arc will have been erupted during the early.

[29] Two basaltic sequences of late Eocene age are exposed along the central Oregon coast (Figure 1), the ~36 Ma tholeiitic Yachats Basalt and the ~34 Ma alkalic Cascade Head Basalt [Parker et al.,and references therein]. Both sequences are associated with .Andesite to dacite lavas erupted in several episodes in the 40–39 Ma Tuscarora volcanic field, ∼ km to the east-southeast (Castor et al., ).

Other late Eocene rocks are 36–35 Ma basaltic lava flows in the Black Rock and Santa Rosa Ranges (Lerch et al., ; Brueseke and Hart, ).An illustration of an open book.

Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk. Software. An illustration of two photographs. Full text of "Geologic field trips in northern Oregon and southern Washington".