Rare earth element geochemistry of South Atlantic deep sea sediments; Ce anomaly change at ∼54 My

Online Access: Get full text
doi: 10.1016/0016-7037(86)90310-8
Author(s): Wang, Y. L.; Liu, Y. G.; Schmitt, R. A.
Author Affiliation(s): Primary:
Oreg. State Univ., Dep. Chem., Corvallis, OR, United States
Other:
Inst. At. Energy, China
Volume Title: Geochimica et Cosmochimica Acta
Source: Geochimica et Cosmochimica Acta, 50(7), p.1337-1355. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037 CODEN: GCACAK
Note: In English. 55 refs.; illus. incl. 8 tables, sketch map
Summary: Major oxides, REE, Cl, Br, Sc, V, Cr, Co, Ni, Zn, Rb, Sr, Cs, Ba, Zr, Hf, Ta, Th and U data are tabulated for sediments ranging from early Cretaceous to Recent, from DSDP Holes 530 A,B (Leg 75). REE are incorporated into marine carbonate phases by adsorption, mainly onto carbonate minerals, and as carbonate coatings on Sc, Hf and Ta-rich Fe-Mn hydroxide flocs. From the Ce anomaly of marine carbonate, the bottom water of the Angola basin was reducing during the Cretaceous, and at 54 m.y. the S Atlantic water became oxidizing. REE patterns of the older (Albian-Santonian) clays from 530A, indicate a basaltic provenance. Changes in Sm/Eu, La/Th, Th/Yb, Ti/Al2O3, FeO/Al2O3 and Hf/Al2O3, suggest changes in source rocks from andesite to granodiorite. REE in the Eocene-Recent sediments may represent the average REE distributions of exposed African continental crust, and their resemblance to those of N American Shale Composite, post-Archaean Australian Shale, and European Shale, indicate complete mixing of REE from different sources and the uniformity of average crustal compositions of different continents.
Year of Publication: 1986
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Atlantic Ocean; Carbonate sediments; Cenozoic; Cerium; DSDP Site 525; DSDP Site 530; Deep Sea Drilling Project; Deep-sea environment; Eh; Eocene; Geochemistry; IPOD; Leg 74; Leg 75; Lower Eocene; Marine environment; Marine sediments; Metals; Paleo-oceanography; Paleogene; Properties; Rare earths; Sediments; South Atlantic; Southeast Atlantic; Stratigraphy; Tertiary; Trace elements
Coordinates: S290418 S290412 E0001800 E0001500
S191200 S191100 E0092400 E0092300
Record ID: 1987005739
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom