| Автор | Sheriff, Steven D. |
| Дата выпуска | 1989 |
| dc.description | Twelve virtual geomagnetic poles from 25 paleomagnetic sites in the Oligocene Hog Heaven volcanic field of northwestern Montana yield a mean pole at 74.4°N, 71.5°E (alpha 95 = 5.9°). This pole indicates clockwise rotation of 10.5° ± 7.4° and flattening of 13.2° ± 4.6° at the 95% confidence level. Assuming the axial geocentric dipole hypothesis criteria have been satisfied, at 95% confidence rotation and flattening are statistically different from zero. These results indicate clockwise rotation of the Hog Heaven volcanic field as expected for the Sanpoil block farther west. However under these assumptions this farsided pole requires northward transport of nearly 1400 km, about 100 times too much given the geologic constraints. Thus, although radiometric dates indicate 5 million years of volcanism, several igneous rock types are present, there are interbedded sediments and erosional intervals during volcanism, and both stable states of the geomagnetic field are recorded, this pole is not a reliable estimate of the Oligocene rotation axis. Perhaps the volcanic events were not distributed independently with respect to paleosecular variation, or a long‐term nondipole field component persisted during much of the evolution of the Hog Heaven volcanic field. These results and previous studies indicate paleomagnetic data from one volcanic field may not be sufficient to estimate tilt, translation, or rotation of a tectonic block. |
| Формат | application.pdf |
| Копирайт | Copyright 1989 by the American Geophysical Union. |
| Тема | Geomagnetism and Paleomagnetism |
| Тема | Geomagnetism and Paleomagnetism: Paleomagnetic secular variation |
| Тема | Geomagnetism and Paleomagnetism: Paleomagnetism applied to tectonics |
| Тема | Geomagnetism and Paleomagnetism: General or miscellaneous |
| Тема | Geographic Location |
| Тема | Information Related to Geographic Region: North America |
| Название | Paleomagnetism of the Hog Heaven Volcanic Field, Montana: Difficulties in averaging paleosecular variation in volcanic fields |
| Тип | article |
| DOI | 10.1029/GL016i012p01359 |
| Electronic ISSN | 1944-8007 |
| Print ISSN | 0094-8276 |
| Журнал | Geophysical Research Letters |
| Том | 16 |
| Первая страница | 1359 |
| Последняя страница | 1362 |
| Аффилиация | Sheriff, Steven D.; Department of Geology, University of Montana, Missoula |
| Выпуск | 12 |
| Библиографическая ссылка | Beck, M. E., Paleomagnetic record of platemargin tectonic processes along the western edge of North America, J. Geophys, Res., 85, 7115–7131, 1980 |
| Библиографическая ссылка | Calderone, G.R. F.Butler, Paleomagnetism of Miocene volcanic rocks from southwestern Arizona: Tectonic implications, Geology., 12, 627–630, 1984 |
| Библиографическая ссылка | Calderone, G. J.R. F.ButlerG. D.Acton, Paleomagnetism of middle Miocene rocks in the MojaveSonora Desert region, Geol. Soc. Amer. Abstr. with Prgrm., 20, 7, A351, 1988 |
| Библиографическая ссылка | Constenius, K., Structural configuration of the Kishenehn Basin delineated by geophysical methods, northwestern Montana and southeastern British Columbia, The Mountain Geologist., 25, 13–28, 1988 |
| Библиографическая ссылка | Demarest, H. H.Jr., Error analysis for the determination of tectonic rotation from paleomagnetic data, I, Geophys. Res., 88, 4321–4328, 1983 |
| Библиографическая ссылка | Diehl, J. F.K. M.McClannahanT. J.Bornhorst, Paleomagnetic results from the Mogollon‐Datil volcanic field, southwestern New Mexico and a refined Mid‐Tertiary reference pole for North America, J. Geophys. Res., 93, 4869–4879, 1988 |
| Библиографическая ссылка | Fisher, R. A., Dispersion on a sphere, Proc. R. Soc. London, Ser. A, 217, 295–305, 1953 |
| Библиографическая ссылка | Fox, K. F.M. E.BeckJr., Paleomagnetic results for Eocene volcanic rocks from northeastern Washington and the Tertiary tectonics of the Pacific Northwest, Tectonics., 4, 323–341, 1985 |
| Библиографическая ссылка | Geissman, J. W.R.Van der VooK. L.HowardJr., A paleomagnetic study of the structural deformation in the Yerington District, Nevada, Am. J. Sci., 282, 1042–1109, 1982 |
| Библиографическая ссылка | Marvin, R. F.R. E.ZartmanJ. D.ObradovichJ. E.Harrison, Geochronometric and lead isotope data on samples from the Wallace 1° by 2° quadrangle, Montana and Idaho, U. S. Geol. Surv. Map MF‐1354‐G., 1984 |
| Библиографическая ссылка | McFadden, P. L.R. T.MerrillM. W.McElhinny, Dipole/quadrupole family modeling of paleosecular variation, J. Geophys. Res., 93, 11583–11588, 1988 |
| Библиографическая ссылка | Proffett, J. M.Jr., Cenozoic geology of the Yerington district, Nevada, and implications for the nature and origin of Basin and Range faulting, Geol. Soc. Amer. Bull., 88, 247–266, 1977 |
| Библиографическая ссылка | Schneider, D. A.D. V.Kent, Inclination anomalies from Indian Ocean sediments and the possibility of a standing nondipole field, J. Geophys. Res., 93, 11621–11630, 1988 |
| Библиографическая ссылка | Sheriff, S. D., Paleomagnetic evidence for spatially distributed post‐Miocene rotation of western Washington and Oregon, Tectonics., 3, 397–408, 1984 |
| Библиографическая ссылка | Sheriff, S. D., Report to the Confederated Salish and Kootenai Tribes: Interpretation of Existing Seismic Data, Confederated Salish and Kootenai Tribes Natural Resource Department, 25, 1985 |
| Библиографическая ссылка | Wells, R. E.P. L.Heller, The relative contribution of accretion, shear, and extension to Cenozoic tectonic rotation in the Pacific Northwest, Geol. Soc. Amer. Bull., 100, 325–338, 1988 |
| Библиографическая ссылка | Wells, R. E.J. W.Hillhouse, Paleomagnetism and tectonic rotations of the lower Miocene Peach Springs Tuff: Colorado Plateau, Arizona, to Barstow, California, Geol. Soc. Amer. Bull., 101, 846–863, 1989 |
| Библиографическая ссылка | Zehner, R.Petrology, Structure, and tectonic setting of the Hog Heaven volcanics, and their relationship to mineralization, M. S. thesis 72, Univ. Mont., 1986 |
