17. The Early Cretaceous-Late Jurassic Magnetic Reversal Time Scale, and the Phoenix Magnetic Lineations Revisited

  1. George H. Sutton,
  2. Murli H. Manghnani,
  3. Ralph Moberly and
  4. Ethel U. Mcafee
  1. R. L. Larson

Published Online: 17 MAR 2013

DOI: 10.1029/GM019p0203

The Geophysics of the Pacific Ocean Basin and Its Margin

The Geophysics of the Pacific Ocean Basin and Its Margin

How to Cite

Larson, R. L. (1976) The Early Cretaceous-Late Jurassic Magnetic Reversal Time Scale, and the Phoenix Magnetic Lineations Revisited, in The Geophysics of the Pacific Ocean Basin and Its Margin (eds G. H. Sutton, M. H. Manghnani, R. Moberly and E. U. Mcafee), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM019p0203

Author Information

  1. Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964

Publication History

  1. Published Online: 17 MAR 2013
  2. Published Print: 1 JAN 1976

ISBN Information

Print ISBN: 9780875900193

Online ISBN: 9781118663592

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Keywords:

  • Geophysics—Pacific area—Congresses;
  • Woolard, George Prior, 1908

Summary

The Hawaiian and Phoenix lineation patterns of the western Pacific are the type localities for a time scale of magnetic reversals for the period 100–160 m.y.B.P. By analyzing the anomaly patterns, a relative stratigraphy of normal and reversed intervals has been derived for the M-reversal sequence. This stratigraphy has been placed in a geochronologic framework by analyzing the magnetic anomalies and basement ages in the vicinities of five DSDP holes. The analysis shows the M-reversal sequence to range in age from Oxfordian (∼153 m.y.) to Aptian (∼106 m.y.) and to be bounded both before and after by long intervals of normal magnetic polarity. Since the initial charting of the Phoenix lineations. additional anomalies have been identified as M11 to M19 just east of the Gilbert Islands. and M11 to M25 have been mapped between the Marshall-Gilbert islands and the Ontong Java plateau. The older anomalies (M20–M25) have a skewness (cross-sectional shape) indicating that these lineations were formed closer to the paleo-equator than were those of the eastern and younger portion of the Phoenix anomaly pattern.