. The Earth beneath the sea : History . _:hv_ Fig. 26. Displacement of a prominent magnetic anomaly by three fracture zones. Distances in statute miles. (After Vacquier et al., 1961.) ficially, they seem to be an extension of the zone. Fracture zones are difficult to detect without continuously recording echo-sounders, and it is probable that many more will be found (see Chapter 16). h. Minor lineations Widely distributed minor lineations on the deep-sea floor frequently lie in pinnate patterns relative to the major lineations such as island arcs, archi- pelagos and fracture zones. Individual
. The Earth beneath the sea : History . _:hv_ Fig. 26. Displacement of a prominent magnetic anomaly by three fracture zones. Distances in statute miles. (After Vacquier et al., 1961.) ficially, they seem to be an extension of the zone. Fracture zones are difficult to detect without continuously recording echo-sounders, and it is probable that many more will be found (see Chapter 16). h. Minor lineations Widely distributed minor lineations on the deep-sea floor frequently lie in pinnate patterns relative to the major lineations such as island arcs, archi- pelagos and fracture zones. Individual minor lineations are generally 20 to 200 km long and consist of: (1) elongate submarine volcanoes, atolls on volcanic platforms and volcanic islands; (2) lines of closely spaced circular submarine volcanoes; (3) asymmetrical ridges; (4) narrow troughs ordinarily associated witli parallel asymmetrical ridges; and (5) straight troughs resembling sub- marine canyons on continental and insular slopes.
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
