Mineral and foraminifer composition of sediments across the Paleocene/Eocene Thermal Maximum from ODP Leg 198 sites
Cobertura |
MEDIAN LATITUDE: 32.331485 * MEDIAN LONGITUDE: 158.081737 * SOUTH-BOUND LATITUDE: 32.002030 * WEST-BOUND LONGITUDE: 157.711660 * NORTH-BOUND LATITUDE: 32.651800 * EAST-BOUND LONGITUDE: 158.505930 * DATE/TIME START: 2001-09-19T13:35:00 * DATE/TIME END: 2001-10-12T01:30:00 |
---|---|
Data(s) |
12/03/2006
|
Resumo |
The Paleocene/Eocene Thermal Maximum (PETM) was a transient interval of global warming ~55 m.y. ago associated with transformation of ecosystems and changes in carbon cycling. The event was caused by the input of massive amounts of CO2 or CH4 to the ocean-atmosphere system. Rapid shoaling of the lysocline and calcite compensation depth (CCD) is a predicted response of CO2 or CH4 input; however, the extent of this shoaling is poorly constrained. Investigation of Ocean Drilling Program (ODP) Sites 1209-1212 at Shatsky Rise, which lies along a depth transect, suggests a minimum lysocline shoaling of ~500 m in the tropical Pacific Ocean during the PETM. The sites also show evidence of CaCO3 dissolution within the sediment column, carbonate "burn-down" below the level of the carbon isotope excursion, and a predicted response to a rapid change in deepwater carbonate saturation. Close examination of several foraminiferal preservation proxies (i.e., fragmentation, benthic/planktonic foraminiferal ratios, coarse fraction, and CaCO3 content) and observations of foraminifers reveal that increased fragmentation levels most reliably predict intervals with visually impoverished foraminiferal preservation as a result of dissolution. Low CaCO3 content and high benthic/planktonic ratios also mirror intervals of poorest preservation. |
Formato |
application/zip, 4 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.777468 doi:10.1594/PANGAEA.777468 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Colosimo, Amanda B; Bralower, Timothy J; Zachos, James C (2006): Evidence for lysocline shoaling at the Paleocene/Eocene Thermal Maximum on Shatsky Rise, northwest Pacific. In: Bralower, TJ; Premoli Silva, I; Malone, MJ (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 198, 1-36, doi:10.2973/odp.proc.sr.198.112.2006 |
Palavras-Chave | #198-1209B; 198-1210B; 198-1211C; 198-1212B; CaCO3; Calcium carbonate; Coulometry; Counting >125 µm fraction; Depth; DEPTH, sediment/rock; Distance, relative; Dist rel; DRILL; Drilling/drill rig; Fish rem; Fish remains; Foram bent; Foram bent/plank; Foraminifera, benthic; Foraminifera, benthic/planktic ratio; Foraminifera, planktic; Foraminifera, planktic, fragments; Foram plankt; Foram plankt fragm; from Paleocene/Eocene Thermal Maximum (positive = above); in wt%; in wt%; coarse fraction >63µm; Joides Resolution; Label; Leg198; mbsf; North Pacific Ocean; Ocean Drilling Program; ODP; ODP sample designation; Py; Pyrite, FeS2; Sample code/label; Sand; whole |
Tipo |
Dataset |