Dickens, Gerald Roy; Barron, John A (1997): Relative abundance of pennate diatoms Thalassionema spp. and Thalassiothrix spp. im Upper Miocene-Lower Pliocene bulk sediment at ODP Hole 145-886B, North Pacific (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.679779, Supplement to: Dickens, GR; Barron, JA (1997): A rapidly deposited pennate diatom ooze in Upper Miocene-Lower Pliocene sediment beneath the North Pacific polar front. Marine Micropaleontology, 31(3-4), 177-182, https://doi.org/10.1016/S0377-8398(97)00003-0
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Abstract:
Rapidly deposited Thalassionema-Thalassiothrti pennate diatom oozes previously have been described in Upper Miocene-Lower Pliocene sediment beneath the frontal boundary of the eastern equatorial Pacific. Here we document a new occurrence of Thalassionema-Thalassiothrix ooze in Upper Miocene-Lower Pliocene sediment beneath the frontal boundary of the subarctic North Pacific. The ooze is a 6 m interval of siliceous sediment at Ocean Drilling Program (ODP) sites 885/886 that was rapidly deposited between approximately 5.0 and 5.9 Ma. Bulk sediment in this interval may contain greater than 85% pennate diatom tests. There are also abundant laminae and pockets that are composed entirely of Thalassionema and Thalassiothrix diatoms. The presence of a rapidly deposited ooze dominated by pennate diatoms indicates unusual past conditions in the overlying surface waters. Time coincident deposition of such oozes at two distinct frontal boundary locations of the Pacific suggests that the unusual surface water conditions were causally linked to large-scale oceanographic change. This same oceanographic change most likely involved (1) addition of nutrients to the ocean, or (2) redistribution of nutrients within the ocean. The occurrence and origin of pennate diatom oozes may be a key component to an integrative understanding of late Neogene paleoceanography and biogeochemical cycling.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 44.689700 * Longitude: -168.240000
Date/Time Start: 1992-04-09T18:15:00 * Date/Time End: 1992-09-05T06:15:00
Minimum DEPTH, sediment/rock: 28.80 m * Maximum DEPTH, sediment/rock: 34.55 m
Event(s):
145-886B * Latitude: 44.689700 * Longitude: -168.240000 * Date/Time Start: 1992-04-09T18:15:00 * Date/Time End: 1992-09-05T06:15:00 * Elevation: -5726.0 m * Penetration: 68.9 m * Recovery: 60.5 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 68.9 m cored; 0 m drilled; 87.8 % recovery
Comment:
depth is composite depth (mcd)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Dickens, Gerald Roy | DSDP/ODP/IODP sample designation | ||
| 3 | Thalassionema spp. | Thalassionema spp. | % | Dickens, Gerald Roy | ||
| 4 | Thalassiothrix spp. | Thalassiothrix spp. | % | Dickens, Gerald Roy |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
27 data points