Citation:

S0377-8398(97)00027-3

Name: Maastrichtian planktic foraminifera of the South Atlantic Ocean
Published: 1998
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

RIS Citation BibTeX Citation Text Citation Facebook TwitterShow Map Google Earth

Abstract:

Stratigraphic, faunal and isotopic analyses of the Maastrichtian at DSDP sites 525A and 21 in the South Atlantic reveal a planktic foraminiferal fauna characterized by two major events, an early late Maastrichtian diversification and end-Maastrichtian mass extinction. Both events are accompanied by major changes in climate and productivity. The diversification event which occurred in two steps between 70.5 and 69.1 Ma increased species richness by a total of 43% and coincided with the onset of major cooling in surface and bottom waters and increased surface productivity. The onset of the terminal decline in Maastrichtian species richness began at 67.5 Ma and the first significant decline in surface productivity occurred at 66.2 Ma, coincident maximum cooling to 13°C in surface waters and the reduction of the surface-to-deep temperature gradient to less than 5°C. Major climatic and moderate productivity changes mark the mass extinction and the last 500 kyr of the Maastrichtian. Between 200 and 400 kyr before the K-T boundary surface and deep waters warmed rapidly by 3-4°C and cooled again during the last 100 kyr of the Maastrichtian. Surface productivity decreased only moderately across the K-T boundary. Species richness began to decline during the late Maastrichtian cooling and by K-T boundary time, the mass extinction had claimed 66% of the species. Viewed within the context of Maastrichtian climate and productivity changes, the K-T mass extinction could have resulted from extreme environmental stress even without the addition of an extraterrestrial impact.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Median Latitude: -28.949275 * Median Longitude: -5.410400 * South-bound Latitude: -29.070700 * West-bound Longitude: -30.597500 * North-bound Latitude: -28.585000 * East-bound Longitude: 2.985300

Date/Time Start: 1969-01-15T00:00:00 * Date/Time End: 1980-06-10T00:00:00

Event(s):

3-21 * Latitude: -28.585000 * Longitude: -30.597500 * Date/Time: 1969-01-15T00:00:00 * Elevation: -2113.0 m * Penetration: 130.6 m * Recovery: 72.6 m * Location: South Atlantic/CONT RISE * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 70.4 m cored; 0 m drilled; 103.1 % recovery

74-525A * Latitude: -29.070700 * Longitude: 2.985300 * Date/Time: 1980-06-10T00:00:00 * Elevation: -2467.0 m * Penetration: 678.1 m * Recovery: 406.6 m * Location: South Atlantic/CREST * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 62 cores; 549.7 m cored; 6 m drilled; 74 % recovery

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

4 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

Datasets listed in this publication series

Li, L; Keller, G (1998): (Table 2) Relative abundance of planktic foraminifera in Maastrichtian sediments of DSDP Hole 3-21 from the Rio Grande Rise, South Atlantic Ocean. https://doi.org/10.1594/PANGAEA.681689
Li, L; Keller, G (1998): (Table 4) Maastrichtian planktic foraminiferal datum events of DSDP Hole 74-525A from the Walvis Ridge, South Atlantic Ocean. https://doi.org/10.1594/PANGAEA.681692
Li, L; Keller, G (1998): (Table 3) Stable carbon and oxygen isotope ratios of foraminifera in Maastrichtian sediments of DSDP Hole 74-525A from the Walvis Ridge, South Atlantic Ocean. https://doi.org/10.1594/PANGAEA.681691
Li, L; Keller, G (1998): (Table 1) Relative abundance of planktic foraminifera in Maastrichtian sediments of DSDP Hole 74-525A from the Walvis Ridge, South Atlantic Ocean. https://doi.org/10.1594/PANGAEA.681687