Aptian–Albian Eustatic Sea-Levels

  1. G. F. Camoin3 and
  2. P. J. Davies4
  1. U. Röhl1 and
  2. J. G. Ogg2

Published Online: 27 MAY 2009

DOI: 10.1002/9781444304879.ch6

Reefs and Carbonate Platforms in the Pacific and Indian Oceans

Reefs and Carbonate Platforms in the Pacific and Indian Oceans

How to Cite

Röhl, U. and Ogg, J. G. (1998) Aptian–Albian Eustatic Sea-Levels, in Reefs and Carbonate Platforms in the Pacific and Indian Oceans (eds G. F. Camoin and P. J. Davies), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304879.ch6

Editor Information

  1. 3

    CEREGE, Aix-en-Provence, France

  2. 4

    University of Sydney, Australia

Author Information

  1. 1

    Geosciences Department, Bremen University, PO Box 33 04 40, D-28334 Bremen, Germany

  2. 2

    Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, USA

Publication History

  1. Published Online: 27 MAY 2009
  2. Published Print: 23 MAR 1998

ISBN Information

Print ISBN: 9780632047789

Online ISBN: 9781444304879



  • seismic reflection profiles across guyots;
  • sea-level fluctuation interpretation;
  • Cretaceous guyot carbonate complexes;
  • storm deposition and rapid lithification interplay;
  • Aptian-Albian eustatic sea-levels


Carbonate banks record rapid falls of relative sea-level as emergent surfaces and rapid rises as deepening or drowning events. During the combined Ocean Drilling Program Legs 143 and 144, four carbonate banks of Aptian–Albian age were drilled on top of seamounts (‘guyots’) that span a large region of the north-western Pacific. Simultaneous episodes of emergence (‘sequence boundary’) or deepening at these guyots must be the result of major eustatic sea-level events. From a combination of cored lithologies and downhole geophysical and geochemical logs we identified depositional sequences. A general geological age framework was assigned from biostratigraphical datum levels and chemo-stratigraphical (carbon and strontium isotope) curves. Compensation for thermal subsidence rates allowed assignment of relative durations of the array of sequences within each stage. The number of upward-shallowing cycles or parasequences was also used to compare relative durations of sequences among sites.

These Pacific carbonate banks record 12 Aptian and 12 Albian significant shallowing events, of which a third were associated with major episodes of emergence. The major events on the guyots can be correlated easily with Aptian–Albian relative sea-level changes observed in European shelf successions, and both regions display the same number of minor events. Therefore, we can apply the relative timing of these events from the thermal subsidence compensation and parasequence counts within the Pacific banks to construct an improved scaling of the associated ammonite zones and biostratigraphical datum levels within the Aptian–Albian interval.