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Benson, Richard H; Peypouquet, Jean Pierre (1983): (Appendix) Ostracodes at DSDP Leg 72 Holes. PANGAEA, https://doi.org/10.1594/PANGAEA.811745, Supplement to: Benson, RH; Peypouquet, JP (1983): The upper and mid-bathyal Cenozoic ostracode faunas of the Rio Grande Rise found on Leg 72 Deep Sea Drilling Project. In: Barker, PF; Carlson, RL; Johnson, DA; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 72, 805-818, https://doi.org/10.2973/dsdp.proc.72.137.1983

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Abstract:
From the study of the ostracodes of Sites 516, 517, and 518 in comparison with those of Sites 21, 22, and 357, we can show that a time lag (early to late Oliogene) existed between the formation of the deep water masses (mid-bathyal ± 2000 m) and those of intermediate depths (upper bathyal ± 1000 m). The ostracode faunas suggest that while the Antarctic Intermediate Water (O2 = 4.5 to 5 ml/l) was flowing through the Vema Trough to fill the northern basins, the returning less-dense, warmer water (O2 = 3.5 to 5 ml/l) originating in Tethys was being gradually displaced upslope.
Efforts to identify shallow (less than 200 m) faunas were unsuccessful. No evidence of significant changes in paleodepth or close proximity to islands could be found that could not be better explained by water-mass changes.
Studies of the genera Poseidonamicus and Krithe suggest an important water mass change at about 14 Ma (late-middle Miocene), but the cause of this event is not yet understood.
Project(s):
Coverage:
Median Latitude: -30.368325 * Median Longitude: -36.686675 * South-bound Latitude: -30.946800 * West-bound Longitude: -38.135300 * North-bound Latitude: -29.973700 * East-bound Longitude: -35.285000
Date/Time Start: 1980-03-11T00:00:00 * Date/Time End: 1980-04-02T00:00:00
Minimum Elevation: -3944.0 m * Maximum Elevation: -1313.0 m
Event(s):
72-516 * Latitude: -30.276300 * Longitude: -35.285200 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 183.3 m * Recovery: 148.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 166.1 m cored; 17.2 m drilled; 89.2 % recovery
72-516F * Latitude: -30.276500 * Longitude: -35.285000 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 1270.6 m * Recovery: 690.1 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 127 cores; 1092.5 m cored; 9 m drilled; 63.2 % recovery
72-517 * Latitude: -30.946800 * Longitude: -38.041200 * Date/Time: 1980-03-30T00:00:00 * Elevation: -2963.0 m * Penetration: 50.9 m * Recovery: 48.2 m * Location: South Atlantic/FLANK * Campaign: Leg72 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 50.9 m cored; 0 m drilled; 94.6 % recovery
Comment:
? = species uncertain.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5Sample code/labelSample labelBenson, Richard HODP sample designation
6StageStageBenson, Richard H
7Nannofossil zoneNannos zoneBenson, Richard H
8ZoneZoneBenson, Richard HOstracode zones (Benson, 1975; doi:10.1111/j.1502-3931.1975.tb00919.x)
9Poseidonamicus sp.Poseidonamicus sp.#Benson, Richard H
10Henryhowella sp.Henryhowella sp.#Benson, Richard H
11Bythocythere sp.Bythocythere sp.#Benson, Richard H
12Cytheropteron sp.Cytheropteron sp.#Benson, Richard H
13Argilloecia sp.Argilloecia sp.#Benson, Richard H
14Atlanticythere sp.Atlanticythere sp.#Benson, Richard H
15Ambocythere sp.Ambocythere sp.#Benson, Richard H
16Cytheropteron sp.Cytheropteron sp.#Benson, Richard H
17Bradleya sp.Bradleya sp.#Benson, Richard H
18Krithe sp.Krithe sp.#Benson, Richard H
19Trachyleberis sp.Trachyleberis sp.#Benson, Richard H
20Echinocythereis ericeaE. ericea#Benson, Richard H
21Rockallia sp.Rockallia sp.#Benson, Richard H
22Bythocythere sp.Bythocythere sp.#Benson, Richard H
23Cytherella sp.Cytherella sp.#Benson, Richard H
24Thalassocythere sp.Thalassocythere sp.#Benson, Richard H
25Abyssocythere sp.Abyssocythere sp.#Benson, Richard H
26Eucythere sp.Eucythere sp.#Benson, Richard H
27Bairdia sp.Bairdia sp.#Benson, Richard H
28Oxycythereis sp.Oxycythereis sp.#Benson, Richard H
29Suhmicythere sp.Suhmicythere sp.#Benson, Richard H
30Bythocypris sp.Bythocypris sp.#Benson, Richard H
31Eucythere sp.Eucythere sp.#Benson, Richard H
32Parakrithe sp.Parakrithe sp.#Benson, Richard H
33Cythereis sp.Cythereis sp.#Benson, Richard H
34Paracypris sp.Paracypris sp.#Benson, Richard H
35Parakrithe sp.Parakrithe sp.#Benson, Richard H
36Agrenocythere sp.Agrenocythere sp.#Benson, Richard H
37Cyprideis sp.Cyprideis sp.#Benson, Richard H
38Ostracoda indeterminataOstrac indet#Benson, Richard H
39Hyphalocythere sp.Hyphalocythere sp.#Benson, Richard H
40Pelecocythere sp.Pelecocythere sp.#Benson, Richard H
Size:
1071 data points

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