Neodymium isotopic reconstruction of late Paleocene-early Eocene thermohaline circulation

Online Access: Get full text
doi: 10.1016/S0012-821X(03)00096-7
Author(s): Thomas, Deborah J.; Bralower, Timothy J.; Jones, Charles E.
Author Affiliation(s): Primary:
University of North Carolina, Department of Geological Sciences, Chapel Hill, NC, United States
Other:
University of Pittsburgh, Department of Geology and Planetary Science, Pittsburgh, PA, United States
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 209(3-4), p.309-322. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. 60 refs.; illus., incl. sketch maps
Summary: High-resolution, fish tooth Nd isotopic records for eight Deep Sea Drilling Project and Ocean Drilling Program sites were used to reconstruct the nature of late Paleocene-early Eocene deep-water circulation. The goal of this reconstruction was to test the hypothesis that a change in thermohaline circulation patterns caused the abrupt 4-5°C warming of deep and bottom waters at the Paleocene/Eocene boundary--the Paleocene-Eocene thermal maximum (PETM) event. The combined set of records indicates a deep-water mass common to the North and South Atlantic, Southern and Indian oceans characterized by mean εNd values of ∼-8.7, and different water masses found in the central Pacific Ocean (εNd∼-4.3) and Caribbean Sea (εNd∼1.2). The geographic pattern of Nd isotopic values before and during the PETM suggests a Southern Ocean deep-water formation site for deep and bottom waters in the Atlantic and Indian ocean basins. The Nd data do not contain evidence for a change in the composition of deep waters prior to the onset of the PETM. This finding is consistent with the pattern of warming established by recently published stable isotope records, suggesting that deep- and bottom-water warming during the PETM was gradual and the consequence of surface-water warming in regions of downwelling. Abstract Copyright (2003) Elsevier, B.V.
Year of Publication: 2003
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Allison Guyot; Antarctic Ocean; Atlantic Ocean; Bay of Biscay; Biochemistry; Blake Nose; Blake Plateau; Bottom currents; Caribbean Sea; Cenozoic; Chordata; Currents; DSDP Site 213; DSDP Site 401; DSDP Site 527; DSDP Site 549; Deep Sea Drilling Project; Eocene; Geochemistry; Goban Spur; High-resolution methods; IPOD; Indian Ocean; Isotope ratios; Isotopes; Leg 113; Leg 143; Leg 165; Leg 171B; Leg 22; Leg 48; Leg 74; Leg 80; Lower Eocene; Maud Rise; Metals; Nd-144/Nd-143; Neodymium; Nicaragua Rise; North Atlantic; ODP Site 1001; ODP Site 1051; ODP Site 690; ODP Site 865; Ocean Drilling Program; Ocean currents; Pacific Ocean; Paleo-oceanography; Paleocene; Paleocirculation; Paleogene; Pisces; Rare earths; South Atlantic; Southern Ocean; Stable isotopes; Teeth; Tertiary; Thermohaline circulation; Upper Paleocene; Vertebrata; Walvis Ridge; Weddell Sea
Coordinates: N300311 N300311 W0762128 W0762128
N154524 N154524 W0745436 W0745436
N182624 N182626 W1793320 W1793321
S101243 S101242 E0935347 E0935346
S650938 S650937 E0011218 E0011218
S280230 S280229 E0014549 E0014547
N490516 N490518 W0130552 W0130554
N472538 N472540 W0084837 W0084838
Record ID: 2003041873
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands