Lynts, George W (1980): (Table 4) Mean diameter of Orbulina universa d'Orbigny at DSDP Leg 54 Holes [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.823501, Supplement to: Lynts, GW (1980): Late Neogene planktonic foraminifers: East Pacific Rise and Galapagos Spreading Center, Deep Sea Drilling Project Leg 54. In: Rosendahl, BR; Hekinian, R; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 54, 487-507, https://doi.org/10.2973/dsdp.proc.54.118.1980
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Abstract:
On Deep Sea Drilling Project Leg 54, we recovered upper Pliocene (Globigerinoides obliquus: PL6 zone) to Pleistocene sediments from the equatorial East Pacific Rise (EPR) and Galapagos spreading center (GSC). Progressively older sediments were drilled at increasing distances from the crest, with the exception of the sediment drilled in the deepest trough known in the Siqueiros fracture zone. The anomalous age obtained at the latter site suggests that the basalt which was drilled may represent fracture zone volcanism. Paleoenvironmental analysis using the planktonic foraminifers at the EPR sites indicated the presence of environmental cycles of shorter wave length during the interval from 0 to 0.24 Ma, whereas cycles of longer wave length occurred from 0.43 to 2.17 Ma. The planktonic foraminiferal taphocoenoses at the EPR sites were strongly affected by selective dissolution which indicated that these EPR sites have been near either the lysocline or carbonate compensation surface since the upper Pliocene. The planktonic foraminiferal thanatocoenoses at the GSC sites were preserved better than those at the EPR sites. The number of planktonic foraminiferal species generally was greatly reduced in the green mud associated with the GSC hydrothermal mounds. More species were found in older than in younger green mud; this suggests that there probably was an increase in the rate of production of green mud sometime after the initiation of the hydrothermal system.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 8.902850 * Median Longitude: -105.370200 * South-bound Latitude: 8.113200 * West-bound Longitude: -106.112800 * North-bound Latitude: 9.176500 * East-bound Longitude: -104.605800
Date/Time Start: 1977-05-08T00:00:00 * Date/Time End: 1977-06-06T00:00:00
Minimum Elevation: -3834.0 m * Maximum Elevation: -3161.0 m
Event(s):
54-419 * Latitude: 8.932700 * Longitude: -105.686200 * Date/Time: 1977-05-08T00:00:00 * Elevation: -3274.0 m * Penetration: 35 m * Recovery: 21.6 m * Location: North Pacific/SEDIMENT POND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 35 m cored; 0 m drilled; 61.7 % recovery
54-420 * Latitude: 9.001700 * Longitude: -106.112800 * Date/Time: 1977-05-10T00:00:00 * Elevation: -3381.0 m * Penetration: 147 m * Recovery: 82.2 m * Location: North Pacific/SEDIMENT POND * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 123.2 m cored; 0 m drilled; 66.7 % recovery
54-422 * Latitude: 9.176500 * Longitude: -105.271200 * Date/Time: 1977-05-14T00:00:00 * Elevation: -3247.0 m * Penetration: 73.8 m * Recovery: 48 m * Location: North Pacific/RIDGE * Campaign: Leg54 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 cores; 73.8 m cored; 0 m drilled; 65 % recovery
Comment:
Empty cells = no data.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | Sample code/label | Sample label | Lynts, George W | DSDP/ODP/IODP sample designation | ||
| 6 | AGE | Age | ka BP | Geocode | ||
| 7 | Orbulina universa, size average | O. universa size | µm | Lynts, George W | ||
| 8 | Orbulina universa, size, standard deviation | O. universa size std dev | ± | Lynts, George W | ||
| 9 | Replicates | Repl | # | Lynts, George W | Counting >74 µm fraction | |
| 10 | Orbulina universa, size average | O. universa size | µm | Lynts, George W | Three-point moving average |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
383 data points