Evolution of neodymium isotopic signature of seawater during the Late Cretaceous; new insights on oceanic circulation changes

Online Access: Get full text
doi: 10.1180/minmag.2013.077.5.13
Author(s): Moiroud, M.; Pucéat, E.; Donnadieu, Y.; Bayon, G.; Deconinck, J. F.
Author Affiliation(s): Primary:
Université de Bourgogne, Dijon, France
Laboratoire des Sciences du Climat et de l'Environnement, France
Institut Français de Recherche pour l'Exploitation de la Mer, France
Volume Title: Goldschmidt abstracts 2013
Source: Mineralogical Magazine, 77(5), p.1777; Goldschmidt 2013, Florence, Italy, Aug. 25-30, 2013. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Note: In English. 6 refs.
Summary: Changes in oceanic circulation during the Late Cretaceous have been inferred from the neodymium isotopic composition (εNd) of fish remains, which reflects the signature of past seawater. However the nature of these changes remains controversial, mainly due to insufficient temporal and spatial coverage of Nd isotope data. Data from continental margins in particular remain scarce for the Cretaceous. This work aims at reconstructing the signature of neritic and oceanic water εNd during the Late Cretaceous/Early Paleogene in potential areas of deep water sinking and seaways linking different oceans. For this purpose, samples of fish remains, foraminifera and detrital fraction have been recovered in Late Cretaceous to Paleocene sediments from both oceanic (DSDP/ODP sites 152, 258, 323, 690 and 700) and neritic (Wyoming, Texas, New Jersey, Chile, Seymour Island, Egypt and Hokkaido) sites. The results primarily point out a decreasing trend after the Cenomanian-Turonian interval, previously observed in the Atlantic and the Indian sector of the Southern Ocean and a general increasing trend during the Maastrichtian and the Paleocene, but also document the first Cretaceous εNd data for the Southern Pacific, the continental margins of North America and Japan, and the Panama and Drake passages. Nevertheless, further comparisons with εNd data available in the literature and climate modelling are required to tentatively explain the oceanic circulation during the Late Cretaceous.
Year of Publication: 2013
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Africa; Asia; Atlantic Ocean; Biochemistry; Caribbean Sea; Cenozoic; Chile; Chordata; Continental margin; Cretaceous; DSDP Site 152; DSDP Site 258; DSDP Site 323; Deep Sea Drilling Project; Drake Passage; East Pacific; Egypt; Far East; Foraminifera; Gulf of Panama; Hokkaido; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Japan; Leg 113; Leg 114; Leg 15; Leg 26; Leg 35; Maud Rise; Mesozoic; Metals; Microfossils; Models; Naturaliste Plateau; Nd-144/Nd-143; Neodymium; New Jersey; Nicaragua Rise; North Africa; North Atlantic; North Pacific; Northeast Pacific; ODP Site 690; ODP Site 700; Ocean Drilling Program; Ocean circulation; Pacific Ocean; Paleo-oceanography; Paleocene; Paleoclimatology; Paleogene; Pisces; Protista; Rare earths; Sea water; Seymour Island; South America; South Atlantic; Southern Ocean; Stable isotopes; Tertiary; Texas; United States; Upper Cretaceous; Vertebrata; Weddell Sea; Wyoming
Coordinates: N155243 N155243 W0743628 W0743628
S334742 S334741 E1122826 E1122825
S634050 S634050 W0975941 W0975941
S650938 S650937 E0011218 E0011218
S513200 S513159 W0301641 W0301642
Record ID: 2014017825
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland