Sexton, Philip F; Wilson, Paul A (2009): (Table 1) Stable isotope record of Middle Cretaceous benthic foraminifera [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.831965, Supplement to: Sexton, PF; Wilson, PA (2009): Preservation of benthic foraminifera and reliability of deep-sea temperature records: Importance of sedimentation rates, lithology, and the need to examine test wall structure. Paleoceanography, 24(2), PA2208, https://doi.org/10.1029/2008PA001650
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Abstract:
Preservation of planktic foraminiferal calcite has received widespread attention in recent years, but the taphonomy of benthic foraminiferal calcite and its influence on the deep-sea palaeotemperature record have gone comparatively unreported. Numerical modeling indicates that the carbonate recrystallization histories of deep-sea sections are dominated by events in their early burial history, meaning that the degree of exchange between sediments and pore fluids during the early postburial phase holds the key to determining the palaeotemperature significance of diagenetic alteration of benthic foraminifera. Postburial sedimentation rate and lithology are likely to be important determinants of the paleoceanographic significance of this sediment–pore fluid interaction. Here we report an investigation of the impact of extreme change in sedimentation rate (a prolonged and widespread Upper Cretaceous hiatus in the North Atlantic Ocean) on the preservation and d18O of benthic foraminifera of Middle Cretaceous age (nannofossil zone NC10, uppermost Albian/lowermost Cenomanian, ~99 Ma ago) from multiple drill sites. At sites where this hiatus immediately overlies NC10, benthic foraminifera appear to display at least moderate preservation of the whole test. However, on closer inspection, these tests are shown to be extremely poorly preserved internally and yield d18O values substantially higher than those from contemporaneous better preserved benthic foraminifera at sites without an immediately overlying hiatus. These high d18O values are interpreted to indicate alteration close to the seafloor in cooler waters during the Late Cretaceous hiatus. Intersite differences in lithology modulate the diagenetic impact of this extreme change in sedimentation rate. Our results highlight the importance of thorough examination of benthic foraminiferal wall structures and lend support to the view that sedimentation rate and lithology are key factors controlling the paleoceanographic significance of diagenetic alteration of biogenic carbonates.
Related to:
Bice, Karen L; Huber, Brian T; Norris, Richard D (2003): Extreme polar warmth during the Cretaceous greenhouse? Paradox of the late Turonian d18O record at Deep Sea Drilling Project Site 511. Paleoceanography, 18(2), 1031, https://doi.org/10.1029/2002PA000848
Fassell, Michelle L; Bralower, Timothy J (1999): Warm, equable Mid-Cretaceous: Stable isotope evidence. In: Special Paper 332: Evolution of the Cretaceous Ocean-Climate System, 332, Geological Society of America, 332, 121-142, https://doi.org/10.1130/0-8137-2332-9.121
Huber, Brian T; Norris, Richard D; MacLeod, Kenneth G (2002): Deep-sea paleotemperature record of extreme warmth during the Cretaceous. Geology, 30(2), 123-126, https://doi.org/10.1130/0091-7613(2002)030%3C0123:DSPROE%3E2.0.CO;2
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 21.471301 * Median Longitude: -3.292246 * South-bound Latitude: -20.587000 * West-bound Longitude: -76.234970 * North-bound Latitude: 48.516000 * East-bound Longitude: 112.208700
Date/Time Start: 1970-10-20T00:00:00 * Date/Time End: 1997-02-08T19:30:00
Minimum DEPTH, sediment/rock: 255.82 m * Maximum DEPTH, sediment/rock: 985.78 m
Event(s):
14-137 * Latitude: 25.925500 * Longitude: -27.060700 * Date/Time: 1970-10-20T00:00:00 * Elevation: -5361.0 m * Penetration: 401 m * Recovery: 69.1 m * Location: North Atlantic/HILL * Campaign: Leg14 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 127 m cored; 9 m drilled; 54.4 % recovery
40-363 * Latitude: -19.645800 * Longitude: 9.046700 * Date/Time: 1975-01-24T00:00:00 * Elevation: -2248.0 m * Penetration: 715 m * Recovery: 224.9 m * Location: South Atlantic/RIDGE * Campaign: Leg40 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 380 m cored; 0 m drilled; 59.2 % recovery
41-370 * Latitude: 32.837500 * Longitude: -10.776000 * Date/Time: 1975-03-29T00:00:00 * Elevation: -4214.0 m * Penetration: 1176.5 m * Recovery: 201.3 m * Location: North Atlantic/BASIN * Campaign: Leg41 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 51 cores; 483 m cored; 0 m drilled; 41.7 % recovery
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
487 data points