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Late Jurassic-Early Cretaceous Time Scales and Oceanic Magnetic Anomaly Block Models

By
James E. T. Channell
James E. T. Channell
Department of Geology, University of Florida, Gainesville, FL 32611
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Elisabetta Erba
Elisabetta Erba
Dipartimento di Scienze della Terra, Università di Milano, 20133 Milano, Italy
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Masao Nakanishi
Masao Nakanishi
Ocean Research Institute, University of Tokyo, Tokyo 164, Japan and Scripps Institution of Oceanography, La Jolla, CA 92093
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Kensaku Tamaki
Kensaku Tamaki
Ocean Research Institute, University of Tokyo, Tokyo 164, Japan
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Published:
January 01, 1995

Abstract

Comparison of oceanic anomaly block models in the M0-M29 interval from the Japanese, Phoenix, Hawaiian and Keathley lineations indicates that the Hawaiian block model represents the closest approximation to a constant spreading rate record. The new Hawaiian block model differs slightly from that of Larson and Hilde (1975). Currently popular numerical age estimates for polarity chrons, base CM0 (121 Ma), CM16-CM15 (137 Ma) and top CM25 (154 Ma), are consistent with constant spreading rate in the new Hawaiian block model but inconsistent with constant spreading in the Larson and Hilde (1975) block model. A new time scale (CENT94) is based on the above ages and constant spreading in the new Hawaiian block model.

Land section magnetostratigraphy, mainly from Italy and Spain, has provided direct correlations of polarity chrons to stage boundaries through ammonite biozones, and indirect correlation through nannofossil and calpionellid biozonations: Barremian-Aptian (base of CM0), Hauterivian-Barremian (upper part of CM4), Valanginian-Hauterivian (base of CM1 In), Berriasian-Valanginian (CM15n), Tithonian-Berriasian (base of CM18), Kimmeridgian-Tithonian (CM22A) and Oxfordian-Kimmeridgian (top CM25). These correlations yield the following stage boundary ages using CENT94: Barremian-Aptian (121 Ma), Hauterivian-Barremian (126 Ma), Valanginian-Hauterivian (131.5 Ma), Berriasian-Valanginian (135.8 Ma), Tithonian-Berriasian (141.6 Ma), Kimmeridgian-Tithonian (150 Ma), and Oxfordian-Kimmeridgian (154 Ma).

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SEPM Special Publication

Geochronology, Time Scales and Global Stratigraphic Correlation

William A. Berggren
William A. Berggren
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Dennis V. Kent
Dennis V. Kent
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Marie-Pierre Aubry
Marie-Pierre Aubry
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Jan Hardenbol
Jan Hardenbol
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SEPM Society for Sedimentary Geology
Volume
54
ISBN electronic:
9781565760912
Publication date:
January 01, 1995

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