Leg 55, Emperor Seamounts; trace elements in transitional tholeiites, alkali basalts, and hawaiites; mantle homogeneity or heterogeneity and magmatic processes

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doi: 10.2973/dsdp.proc.55.123.1980
Author(s): Cambon, P.; Joron, J. L.; Bougault, H.; Treuil, M.
Author Affiliation(s): Primary:
Cent. Oceanol. Bretagne, Brest, France
Volume Title: Initial reports of the Deep Sea Drilling Project covering Leg 55 of the cruises of the drilling vessel Glomar Challenger, Honolulu, Hawaii to Yokohama, Japan; July-September 1977
Volume Author(s): Shambach, James, editor; Jackson, Everett Dale; Koizumi, Itaru; Avdeiko, Gennady; Butt, Arif; Clague, David; Dalrymple, G. Brent; Greene, H. Gary; Karpoff, Anne Marie; Kirkpatrick, R. James; Kono, Masaru; Hsin Yi Ling; McKenzie, Judith; Morgan, Jason; Takayama, Toshiaki
Source: Initial reports of the Deep Sea Drilling Project covering Leg 55 of the cruises of the drilling vessel Glomar Challenger, Honolulu, Hawaii to Yokohama, Japan; July-September 1977, James Shambach, Everett Dale Jackson, Itaru Koizumi, Gennady Avdeiko, Arif Butt, David Clague, G. Brent Dalrymple, H. Gary Greene, Anne Marie Karpoff, R. James Kirkpatrick, Masaru Kono, Hsin Yi Ling, Judith McKenzie, Jason Morgan and Toshiaki Takayama. Initial Reports of the Deep Sea Drilling Project, Vol.55, p.585-597. Publisher: Texas A & M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0080-8334 CODEN: IDSDA6
Note: In English. 3 refs.; illus. incl. tables
Summary: According to the classification of the elements which was made previously from the samples recovered in the Atlantic Ocean, with regard to their physicochemical properties and partition coefficients, the following items can be formulated from the study of the Emperor Seamount samples drilled during Leg 55: 1) The chondritic nature of the "primordial" mantle is confirmed through Y/Tb, Zr/Hf, and Nb/Ta ratios. 2) The value 9 for the La/Ta ratio has been found related to topographic highs or platforms in the Atlantic Ocean (the value is 18 in other cases, corresponding to typically "depleted" tholeiites). The values close to 9 found for Emperor Seamount samples independently of their petrographic classification (tholeiite, alkali basalts, or hawaiite) tend to confirm the correlation of this ratio to topography. 3) The single Th/Ta ratio observed in tholeiites, alkali basalts, and hawaiites suggests similar mantle sources for these different rock types. 4) The transition elements belonging to the same series, characterized by different partition coefficients, show a fractionation. This fractionation can be interpreted as the result of partial melting. 5) Ti and V are fractionated in hawaiites as a consequence of titanomagnetite crystallization.
Year of Publication: 1980
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 02 Geochemistry; Alkalic composition; Basalts; Deep Sea Drilling Project; Emperor Seamounts; Fractional crystallization; Fractionation; Geochemistry; Howaiites; IPOD; Igneous processes; Igneous rocks; Leg 55; Mantle; North Pacific; Northwest Pacific; Pacific Ocean; Petrology; Physicochemical properties; Processes; Site 430; Site 432; Site 433; Tholeiites; Trace elements; Volcanic rocks; West Pacific
Coordinates: N350000 N500000 E1750000 E1600000
Record ID: 1981027017
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from U. S. Geological Survey, Hawaiian Volcano Observatory, United States