Structure of continental margins along the strike-slip and compresional plate boundaries of the Gulf of Alaska
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Abstract
Tectonic mechanisms along the eastern and western Gulf of Alaska continental margins are inferred to be strike-slip (transform) and compressional (converging) plate boundaries in tectonic models of the North Pacific. Recent field observations are consistent with the overall plate geometry; however, the crustal configuration observed departs significantly from the simplistic diagrams and models used by some authors. Along the strike-slip plate boundary, a large buried trench requires that another process beside simple lateral shear is operating at the oceanic-continental crustal juncture. Along. the eastern Aleutian Trench an absence of large thrust faults requires other mechanisms of transmitting the shear of the Benioff zone to the earth's surface. ln this area it seems that the Benioff zone may be a sub-crustal feature and that extensive plastic deformation occurs in the lower crust just above the Benioff zone. This may in turn be expressed in the overlying sedimentary section as a wide zone of folding.
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References
ATWATER, Tanya, 1970. Implications of plate tectonics for the Cenozoic tectonic evolution of western North America. Geol. Soc. Amer. Bull, 81 (12) : 3513-3536. DOI: https://doi.org/10.1130/0016-7606(1970)81[3513:IOPTFT]2.0.CO;2
BURK, C. A., 1965. Geology of the Alaska Peninsula Island arc and continental margin, pts. I-3, Geol. Soc. Amer. Memoir 99, 250. DOI: https://doi.org/10.1130/MEM99-p1
CHASE, R. L., and TIFFIN, D.L. 1972. Queen Charlotte fault-zone; British Columbia, Proc. lnternat Geol. Congress, Montreal, 17-27.
COUCH, R.W., 1969. Gravity and structures of the crust and subcrust west of Washington and British Columbia, Ph.D. dissertation, Oregon. State Univ., Corvallis.
EMBLEY, R. W., J.I. EWING and A. B. WATTS, 1973. Sediment distribution and continental margin structure in the Gulf of Alaska, Trans. Amer. Geophys. Union, 54, 336.
HAYES, D. E., and W.C. PITMAN, 1970. Magnetic lineations in the North Pacific, in Hayes, J .D., ed., Geological Investigations of the North Pacific , Geol. Soc. Amer. Memoir, 126 : 291-3 14. DOI: https://doi.org/10.1130/MEM126-p291
JOHNSON, S.H., R.W. COUCH, M. GEMPERLE and E.R, BANKS, 1972. Seismic refraction measurements in southeast Alaska and western British Columbia, Canad. Jour. Earth Science, 9(12) : 1756-1765. DOI: https://doi.org/10.1139/e72-154
KANAMORI, Hiroo, 1970. The Alaska earthquake of 1964, Radiation of long-period surface waves and source mechanism, J. Geophys. Res., 75(26) : 5029-5040. DOI: https://doi.org/10.1029/JB075i026p05029
LE PICHON, X., 1968. Sea-floor spreading and continental drift, J. Geophys. Res., 73 : 3661 -3697. DOI: https://doi.org/10.1029/JB073i012p03661
McKENZIE, D.P., and R.L. PARKER, 1967. The North Pacific, an example of tectonics on a sphere, Nature, 216 : 1276-1280. DOI: https://doi.org/10.1038/2161276a0
MORGAN, W. J., 1968. Rises, trenches, great faults, and crustal blocks, J. Geophys, Res., 73 : 1959-1982. DOI: https://doi.org/10.1029/JB073i006p01959
PLAFKER, George, 1969. Tectonics of the March 27, 1964, Alaska earthquake, US. Geol. Survey Prof. Paper 543-1, 74 pp. DOI: https://doi.org/10.3133/pp543I
ST. AMAND, P., 1957. Geological and geophysical synthesis of the tectonics of portions of British Columbia, the Yukon Territory, and Alaska, Geol. Soc, Amer. Bull., 68, 1343. DOI: https://doi.org/10.1130/0016-7606(1957)68[1343:GAGSOT]2.0.CO;2
SHOR, G.G., 1962. Seismic refraction studies off the coast of Alaska 1956-1957, Geol. Soc. Amer. Bull., 52 : 37-57.
STAUDER, William and G.A. BOLLINGER, 1966. The focal mechanism of the Alaska earthquake of March 28, 1964, and its aftershock sequence, J. Geophys. Res., 71 : 5283-5296. DOI: https://doi.org/10.1029/JZ071i022p05283
SOUTHERLAND-BROWN, A., 1968. Geology of the Queen Charlotte Islands, British Columbia, British-Columbia Dept. Mines and Petr. Res. Bull., 54, 226 pp.
TWENHOFEL, W.S. 1952. Recent shore-line changes along the Pacific coast of Alaska, Amer. Jour. Science, 250 : 523-548. DOI: https://doi.org/10.2475/ajs.250.7.523
VON HUENE R.E., and L. D. KULM, 1973. Tectonic summary of Leg 18, Kulm, L. D., R. E von Huene, et al, Initial Reports of the Deep Sea Drilling Project, Vol. XVIII, Washington. DOI: https://doi.org/10.2973/dsdp.proc.18.133.1973
VON HUENE, R., 1972. Structure of the continental margin and tectonism at the eastern Aleutian Trench, Geol. Soc. Amer. Bull., 83 : 3613-3626. DOI: https://doi.org/10.1130/0016-7606(1972)83[3613:SOTCMA]2.0.CO;2