By Ruth A. M. Schmidt, Warren J. Nokleberg, Robert A. Page
About The Product
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A textbook for graduate scholars and researchers in geology, geophysics, fabrics technology, mineralogy and ceramics.
Concerning the ProductThis AGU quantity is a suite of papers that have been provided on the IUGG Symposium U7 (Lower Crust: homes and approaches) held in Vancouver, Canada in August, 1987. the primary aim of this symposium was once to replace our knowing of the homes of the decrease crust and to check the actual and chemical tactics which could have taken position and are nonetheless happening within the deep crust.
Released by means of the yank Geophysical Union as a part of the Geophysical Monograph sequence. The superb luck of Earth-based radio astronomy is because of a number of components. A vast atmospheric window of greater than 4 orders-of-magnitude in frequency extends from ~30 MHz (wavelength 10 m), the place ionospheric distortions and opacity start to turn into an issue, to ~300 GHz (wavelength 1 mm), the place atmospheric absorption turns into over the top, even from excessive mountain websites.
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Additional resources for Alaskan Geological and Geophysical Transect
L. Ambos, W. D. Mooney, and N. I. Christensen, Crustal structure of accreted terranes in the Chugach Mountains and Copper River basin, southern Alaska, from seismic-refraction results, Journal of Geophysical Research, 1989, in press. Goodwin, E. , G. S. Fuis, E. L. Ambos, and W. J. Nokleberg, The crustal structure of the Wrangellia terrane along the Tok Highway, eastern southern Alaska, Journal of Geophysical Research, 1989, in press. Jones, D. , N. J. Silberling, P. J. Coney, and G. Plafker, Lithotectonic terrane map of Alaska, h N.
More detailed guides to the Quaternary geology of the region are given by Ferrians and others (1983), and Pewe and Reger (1983a, b). Please note that because of local rerouting of the highway, not all mileposts are always in place, and in a few cases, mileposts are misplaced. ~ e c a u s eof the complex geology, poor outcrops, and limited age data, developing a geologic history and tectonic interpretation in the region is difficult. Consequently considerable variation exists in interpretation. The interpretation in this study is mainly a result of the TACT program studies of the first and third authors, and is a modification of interpretations of the second author as presented in Foster and others (1987).
Locally abundant relict igneous biotite and muscovite occur in some of the metagranitic plutons. These metagranitic plutons are interpreted as Late Jurassic and Early Cretaceous, as determined from metamorphic ages for K-Ar biotite and white mica, discussed below. The metavolcanic rocks of the metamorphic complex are generally massive. However sparse outcrops display volcanic breccia and pillow andesite structures.