Hermoyian, Casey S; Owen, Robert M (2001): Sedimentation rates and geochemistry of the Atlantic and Indic Ocean of Late Miocene - Early Pliocene. PANGAEA, https://doi.org/10.1594/PANGAEA.738557, Supplement to: Hermoyian, CS; Owen, RM (2001): Late Miocene-early Pliocene biogenic bloom: Evidence from low-productivity regions of the Indian and Atlantic Oceans. Paleoceanography, 16(1), 95-100, https://doi.org/10.1029/2000PA000501
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Studies of the late Miocene-early Pliocene biogenic bloom typically have focused on high-productivity areas in the Indian and Pacific Oceans in order to achieve high resolution samples. Thus there is a paucity of information concerning whether the Atlantic Ocean, in general or low-productivity regions in all three basins experienced this bloom. This study measured the phosphorus mass accumulation rate (PMAR). in five cores from low-productivity regions of the Atlantic and Indian Oceans. All cores exhibit a peak in productivity 4-5.5 Ma, coincident with the Indo-Pacific bloom. This suggests that nutrients were not shifted away from low-productivity regions nor out of the Atlantic Ocean. Instead, it appears that the bloom was caused by an overall increase in nutrient flux into the world oceans. Four of the cores record the bloom's PMAR peak as bimodal, indicating a pulsed increase in phosphorus to the oceans. This suggests that there may have been multiple causes of the biogenic bloom.
Median Latitude: -26.178640 * Median Longitude: 27.700280 * South-bound Latitude: -30.276500 * West-bound Longitude: -35.285300 * North-bound Latitude: -17.024000 * East-bound Longitude: 88.181600
Date/Time Start: 1980-03-11T00:00:00 * Date/Time End: 1988-06-04T06:15:00
121-756B * Latitude: -27.356000 * Longitude: 87.596800 * Date/Time Start: 1988-05-26T04:00:00 * Date/Time End: 1988-05-26T12:35:00 * Elevation: -1529.0 m * Penetration: 104.3 m * Recovery: 105.7 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 11 core; 104.3 m cored; 0 m drilled; 101.3 % recovery
121-757B * Latitude: -17.024000 * Longitude: 88.181600 * Date/Time Start: 1988-06-01T11:00:00 * Date/Time End: 1988-06-04T06:15:00 * Elevation: -1663.0 m * Penetration: 374.8 m * Recovery: 271.94 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 374.8 m cored; 0 m drilled; 72.6 % recovery
72-516A * Latitude: -30.276500 * Longitude: -35.285300 * Date/Time: 1980-03-11T00:00:00 * Elevation: -1313.0 m * Penetration: 69.5 m * Recovery: 60.9 m * Location: South Atlantic/CONT RISE * Campaign: Leg72 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 65.1 m cored; 4.4 m drilled; 93.6 % recovery