The paradox of drowned carbonate platforms and the origin of Cretaceous Pacific guyots

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doi: 10.1038/31865
Author(s): Wilson, Paul A.; Jenkyns, Hugh C.; Elderfield, Henry; Larson, Roger L.
Author Affiliation(s): Primary:
University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Other:
University of Oxford, United Kingdom
University of Rhode Island, United States
Volume Title: Nature (London)
Source: Nature (London), 392(6679), p.889-894. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836 CODEN: NATUAS
Note: In English. 52 refs.; illus., incl. 1 table, sketch map
Summary: The growth potential of drowned shallow-water carbonate platforms is considered to be one or two orders of magnitude greater than long-term rates of relative sea-level rise. This paradox is investigated for seven guyots drilled by ODP Legs 143, 144 at ∼ 30° longitude, in the W Pacific. Two end-member hypotheses are discussed - 'death by emergence and submergence' (predicts simultaneous platform karstification and drowning events over a wide range of latitude), and 'death-in-the-tropics' (predicts sequential drowning on non-karstified platforms at low latitude). To test possible karstification of guyot platforms before drowning, δ 13C and δ 18O analyses are presented of bulk limestones and separates from the upper 150 m of the Cretaceous platforms drilled. The mechanism responsible for the drowning of the carbonate platforms remains, however, enigmatic, though the survival of Cretaceous and Palaeogene mid-oceanic shallow-water carbonate platforms was threatened by, rather than promoted by, tectonic passage through low-latitude waters. The platforms drowned sequentially over 60 m.y. while being transposed N by Pacific plate motion through 0-10° S.
Year of Publication: 1998
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Alkaline earth metals; Anaerobic environment; Atolls; Basalts; Boreholes; C-13/C-12; Calcite; Carbon; Carbonate platforms; Carbonates; Cretaceous; Genesis; Geochemistry; Igneous rocks; Isotope ratios; Isotopes; Karstification; Leg 143; Leg 144; Mesozoic; Metals; O-18/O-16; Ocean Drilling Program; Ocean floors; Oxygen; Pacific Ocean; Pacific Plate; Paleolatitude; Paleomagnetism; Paleotemperature; Pelagic environment; Reefs; Sea water; Sea-level changes; Seamounts; Sedimentation rates; Shallow-water environment; Sr-87/Sr-86; Stable isotopes; Strontium; Tectonics; Transgression; Volcanic rocks; Volcanoes
Coordinates: N053000 N350000 E1723000 E1440000
Record ID: 1998031743
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom