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Isotopic composition of foraminifera from sediments of DSDP Legs 3, 6-9, 17

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posted on 22.11.2019 by Samuel M Savin, Robert G Douglas, Francis G Stehli
Oxygen isotopic compositions of the tests of planktonic foraminifera from several Deep Sea Drilling Project sites provide a general picture of low-latitude marine temperatures from Maastrichtian time to the present. Bottom temperatures determined from the isotopic compositions of benthonic foraminifera are interpreted as being indicative of high-latitude surface temperatures. Prior to the beginning of middle Miocene time, high- and low-latitude temperatures changed in parallel fashion. Following an apparently small and short-lived drop in temperature near the Tertiary-Cretaceous boundary, temperatures remained warm and relatively constant through Paleocene and early and middle Eocene time; bottom temperatures then were on the order of 12°C. A sharp temperature drop in late Eocene time was followed by a more gradual lowering of temperature, culminating in a late Oligocene high-latitude temperature minimum of about 4°C. A temperature rise through early Miocene time was followed in middle Miocene time by a sudden divergence of high- and low-latitude temperatures: high-latitude temperatures dropped dramatically, perhaps corresponding to the onset of major glaciation in Antarctica, but low-latitude temperatures remained constant or perhaps increased. This uncoupling of high-and low-latitude temperatures is postulated to be related to the establishment of a circum-Antarctic circulation similar to that of today. A further drop in high-latitude temperatures in late Pliocene time probably signaled the onset of a major increase in polar glaciation, including extensive sea-ice formation. Early Miocene, small-amplitude (1 per mil) sympathetic fluctuations in isotopic compositions of planktonic and benthonic foraminifera have been identified. These have a period of several hundred thousand years. Superimposed upon these are much more rapid and smaller fluctuations (0.2 to 0.5 per mil) with a period of about 80000 to 90000 yr. This is similar to the period observed for Pleistocene isotopic temperature fluctuations. In low latitudes, much smaller vertical temperature gradients seem to have existed during Maastrichtian and Paleogene time than exist at present. The absence of a sharply defined thermocline during early Tertiary time is also suggested.

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History

Year

1975

Size

2 datasets

Coverage

* Median Latitude: -18.7926188235 * Median Longitude: -76.8466623529 * South-bound Latitude: -37.967 * West-bound Longitude: 142.535 * North-bound Latitude: 32.4483 * East-bound Longitude: -6.6025 * Date/Time Start: 1965-01-01T00:00:00 * Date/Time End: 1971-05-19T00:00:00

Event(s)

17-167 * Latitude: 7.0683 * Longitude: -176.825 * Date/Time: 1971-04-23T00:00:00 * Elevation: -3176.0 * Penetration: 1185 m * Recovery: 288.8 m * Location: North Pacific/CONT RISE * Campaign: Leg17 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 78 cores; 699 m cored; 83 m drilled; 41.3 % recovery 17-171 * Latitude: 19.1317 * Longitude: -169.46 * Date/Time: 1971-05-19T00:00:00 * Elevation: -2295.0 * Penetration: 479 m * Recovery: 169.8 m * Location: North Pacific/GUYOT * Campaign: Leg17 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 296 m cored; 60 m drilled; 57.4 % recovery 3-15 * Latitude: -30.8897 * Longitude: -17.9832 * Date/Time: 1968-12-24T00:00:00 * Elevation: -3927.0 * Penetration: 143 m * Recovery: 71.2 m * Location: South Atlantic/HILL * Campaign: Leg3 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 73.7 m cored; 0 m drilled; 96.6 % recovery 3-16 * Latitude: -30.3358 * Longitude: -15.7132 * Date/Time: 1968-12-26T00:00:00 * Elevation: -3527.0 * Penetration: 175.8 m * Recovery: 99.1 m * Location: South Atlantic/HILL * Campaign: Leg3 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 101 m cored; 0.3 m drilled; 98.1 % recovery 3-17A * Latitude: -28.0457 * Longitude: -6.6025 * Date/Time: 1968-12-30T00:00:00 * Elevation: -4265.0 * Penetration: 102.5 m * Recovery: 34.9 m * Location: South Atlantic/HILL * Campaign: Leg3 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 35.4 m cored; 0 m drilled; 98.6 % recovery 3-20C * Latitude: -28.5245 * Longitude: -26.8455 * Date/Time: 1969-01-09T00:00:00 * Elevation: -4506.0 * Penetration: 72.3 m * Recovery: 48.6 m * Location: South Atlantic/VALLEY * Campaign: Leg3 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 50.5 m cored; 0 m drilled; 96.2 % recovery 3-21 * Latitude: -28.585 * Longitude: -30.5975 * Date/Time: 1969-01-15T00:00:00 * Elevation: -2113.0 * Penetration: 130.6 m * Recovery: 72.6 m * Location: South Atlantic/CONT RISE * Campaign: Leg3 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 70.4 m cored; 0 m drilled; 103.1 % recovery 3-22 * Latitude: -30.0052 * Longitude: -35.25 * Date/Time: 1969-01-18T00:00:00 * Elevation: -2134.0 * Penetration: 242.2 m * Recovery: 38.4 m * Location: South Atlantic/CONT RISE * Campaign: Leg3 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 44.5 m cored; 0 m drilled; 86.3 % recovery 6-44 * Latitude: 19.3083 * Longitude: -169.015 * Date/Time: 1969-06-13T00:00:00 * Elevation: -1478.0 * Penetration: 75.6 m * Recovery: 29 m * Location: North Pacific/RIDGE * Campaign: Leg6 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 32.4 m cored; 0 m drilled; 89.5 % recovery 6-47 * Latitude: 32.4483 * Longitude: 157.7117 * Date/Time: 1969-06-28T00:00:00 * Elevation: -2689.0 * Penetration: 9.1 m * Recovery: 9.1 m * Location: North Pacific/PLATEAU * Campaign: Leg6 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 1 cores; 9.1 m cored; 0 m drilled; 100 % recovery 6-55 * Latitude: 9.3017 * Longitude: 142.535 * Date/Time: 1969-07-21T00:00:00 * Elevation: -2850.0 * Penetration: 130.8 m * Recovery: 119.1 m * Location: North Pacific/RIDGE * Campaign: Leg6 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 128.1 m cored; 0 m drilled; 93 % recovery 7-64 * Latitude: -1.7422 * Longitude: 158.6097 * Date/Time: 1969-08-31T00:00:00 * Elevation: -2060.0 * Penetration: 851 m * Recovery: 74 m * Location: South Pacific/PLATEAU * Campaign: Leg7 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 79 m cored; 0 m drilled; 93.7 % recovery 8-71 * Latitude: 4.4713 * Longitude: -140.3152 * Date/Time: 1969-11-01T00:00:00 * Elevation: -4419.0 * Penetration: 474 m * Recovery: 368.3 m * Location: North Pacific/PLAIN * Campaign: Leg8 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 431 m cored; 0 m drilled; 85.4 % recovery 9-78 * Latitude: 7.95 * Longitude: -127.3558 * Date/Time: 1969-12-25T00:00:00 * Elevation: -4378.0 * Penetration: 320.4 m * Recovery: 301.3 m * Location: North Pacific/CONT RISE * Campaign: Leg9 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 320.4 m cored; 0 m drilled; 94 % recovery 9-80A * Latitude: -0.962 * Longitude: -121.5537 * Date/Time: 1970-01-04T00:00:00 * Elevation: -4411.0 * Penetration: 155.7 m * Recovery: 45.5 m * Location: South Pacific/VALLEY * Campaign: Leg9 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 45.5 m cored; 0 m drilled; 99.9 % recovery ELT21.003-PC * Latitude: -34.95 * Longitude: -91.958 * Date/Time: 1965-01-01T00:00:00 * Elevation: -3662.0 * Recovery5.08 m * Campaign: ELT21 * Basis: Eltanin * Device: Piston corer (PC) ELT24.010-PC * Latitude: -37.967 * Longitude: -134.983 * Date/Time: 1966-01-01T00:00:00 * Elevation: -4961.0 * Recovery3.61 m * Campaign: ELT24 * Basis: Eltanin * Device: Piston corer (PC) ELT24.016-PC * Latitude: -35.217 * Longitude: -124.983 * Date/Time: 1966-01-01T00:00:00 * Elevation: -3984.0 * Recovery11.69 m * Campaign: ELT24 * Basis: Eltanin * Device: Piston corer (PC)

Project(s)

Deep Sea Drilling Project (DSDP)

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