Trace element evidence from seamounts for recycled oceanic crust in the Eastern Pacific mantle

Niu, Yaoling and Batiza, Rodey (1997) Trace element evidence from seamounts for recycled oceanic crust in the Eastern Pacific mantle. Earth and Planetary Science Letters, 148 3-4: 471-483.

Author Niu, Yaoling
Batiza, Rodey
Title Trace element evidence from seamounts for recycled oceanic crust in the Eastern Pacific mantle
Journal name Earth and Planetary Science Letters   Check publisher's open access policy
ISSN 0012-821X
Publication date 1997-05-01
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 148
Issue 3-4
Start page 471
End page 483
Total pages 13
Language eng
Subject 1908 Geophysics
1906 Geochemistry and Petrology
1901 Earth and Planetary Sciences (miscellaneous)
1912 Space and Planetary Science
Abstract We present trace element data for 80 samples from about 50 seamounts in the east equatorial Pacific near the East Pacific Rise. These data indicate that the heterogeneous mantle source that supplies the seamounts consists of two components: (1) an extremely depleted component, much more depleted than estimates of the source of depleted MORB; and (2) an enriched component even more enriched than average OIB. The depleted component shows large variations in Zr/Hf, Nb/Ta, Rb/Cs, Ce/Pb, and Th/U that are correlated with each other and with La/Sm, indicating that these paired elements do fractionate from each other in some oceanic basalts. The order of incompatibility of trace elements we find differs slightly from that found elsewhere. For example, for seamounts, we find that D ≈ D < D ≈ D. In comparison with Th and U, the enriched component shows anomalous enrichments of Ta and Nb. Since such fractionations are characteristic of subduction zones, we suggest that the most likely ultimate source of the enriched component is recycled ocean crust.
Keyword Basalts
East Pacific Rise
Mantle source heterogeneity
Oceanic crust recycling
Seamounts
Trace elements
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Fri, 29 Dec 2017, 10:51:42 EST