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Provenance and dispersal of muds south of the Aleutian arc, north Pacific Ocean (1989)

Underwood, Michael B. ; Hathon, Eric G.

Springer

Geo-marine letters 9 (1989), S. 67-75

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ISSN: 1432-1157

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie

Notizen: Abstract X-ray diffraction analyses show that the clay mineralogies of near-surface muds in the Gulf of Alaska (mostly illite and chlorite) are consistent with detrital sources in southern Alaska. Expandable clay minerals are derived from the Aleutian volcanic arc, and their percentages increase progressively toward the west. Smectite values are lower than expected, however, particularly in the central forearc, and there is less smectite on the insular trench slope than farther seaward. The regional clay-mineral distribution is controlled by two opposed contour currents and by the influx of suspended sediment via both transverse and trench-axis turbidity currents.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02430426

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Digitale Medien

Transverse infilling of the central Aleutian Trench by unconfined turbidity currents (1986)

Underwood, Michael B.

Springer

Geo-marine letters 6 (1986), S. 7-13

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ISSN: 1432-1157

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie

Notizen: Abstract Holocene sand layers cored from the central Aleutian Trench are dominated by volcaniclastic debris, and the only likely source is the central Aleutian volcanic arc. This creates something of an enigma because bathymetric obstructions seemingly prevent direct delivery of sediment via transverse canyons or channels. Turbidity currents are funneled through submarine canyons on the upper trench slope, but the flows become unconfined as they cross the midslope Aleutian Terrace. Evidently, the turbid flows maintain high enough velocities to climb over the trench-slope break; acceleration down the lower trench slope then allows forearc bypassing to occur without the aid of through-going channels.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02311690

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