Geochemistry of Cretaceous volcaniclastic sediments in the Nauru and East Mariana Basins provides insights into the mantle sources of giant oceanic plateaus

Author(s): Castillo, Paterno R.
Author Affiliation(s): Primary:
Scripps Institution of Oceanography, Geosciences Research Division, La Jolla, CA, United States
Other:
University of Hawaii, United States
University of Oregon, United States
University of Leicester, United Kingdom
Volume Title: Origin and evolution of the Ontong Java Plateau
Volume Author(s): Fitton, J. Godfrey, editor; Mahoney, John J.; Wallace, Paul J.; Saunders, Andrew D.
Source: Origin and evolution of the Ontong Java Plateau, edited by J. Godfrey Fitton, John J. Mahoney, Paul J. Wallace and Andrew D. Saunders. Geological Society Special Publications, Vol.229, p.353-368. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719. ISBN: 1-86239-157-2 CODEN: GSLSBW
Note: In English. 73 refs.; illus., incl. 2 tables, sketch maps
Summary: Cretaceous volcaniclastic sediments sampled at the Nauru and East Mariana basins were chemically and isotopically analysed in order to learn more about the formation and mantle source of the Ontong Java Plateau, an oceanic large igneous province. Despite their variably altered state, the volcanogenic sedimentary components still contain petrogenetic tracers (e.g. high field strength elements, and Nd-and Pb-isotopes) that can be used to constrain the composition of their respective mantle sources. The Nauru volcaniclastics have incompatible trace-element and Nd-and Pb-isotope compositions typical of the Kwaimbaita-type tholeiitic lavas of the Ontong Java Plateau. Combined with the results of recent investigations, the presence of Kwaimbaita-type volcaniclastics in the Nauru Basin reinforces the proposal that the Kwaimbaita-type lavas comprise the bulk of the giant plateau. On the other hand, the East Mariana volcaniclastics have high incompatible trace-element concentrations and Nd- and Pb-isotope ratios typical of alkalic ocean island basalts. Their source is either the Limalok Guyot in the Ratak seamount chain of the Marshall-Gilbert Islands or the ancestral Manihiki-Hikurangi Plateau. Other geological data argue for the Manihiki-Hikurangi Plateau as the source. This implies that the mid-Cretaceous Pacific upper mantle was dominated by the sources of lavas that formed giant oceanic plateaus.
Year of Publication: 2004
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 05 Petrology, Igneous and Metamorphic; 18 Geophysics, Solid-Earth; Absolute age; Chemical composition; Chemical ratios; Cretaceous; DSDP Site 462; Dates; Deep Sea Drilling Project; East Mariana Basin; IPOD; Kiribati; Large igneous provinces; Lava; Leg 129; Leg 61; Leg 89; Limalok Guyot; Major elements; Mantle; Marshall Islands; Mesozoic; Micronesia; Nauru Basin; Nd/Nd; North Pacific; Northwest Pacific; ODP Site 802; Ocean Drilling Program; Ocean floors; Oceania; Ontong Java Plateau; Pacific Ocean; Pb/Pb; Plate tectonics; Ratak Seamount; Sampling; Seamounts; Sr/Sr; Trace elements; Upper mantle; Volcaniclastics; West Pacific
Coordinates: N120546 N120547 E1531238 E1531237
N071415 N071415 E1650150 E1650150
Record ID: 2006012386
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