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Origin of negative cerium anomalies in subduction-related volcanic samples: Constraints from Ce and Nd isotopes
- Source :
- Chemical Geology, Chemical Geology, 2018, 500, pp.46-63. ⟨10.1016/j.chemgeo.2018.09.006⟩, Chemical Geology, Elsevier, 2018, 500, pp.46-63. ⟨10.1016/j.chemgeo.2018.09.006⟩
- Publication Year :
- 2018
- Publisher :
- Elsevier, 2018.
-
Abstract
- International audience; Negative Cerium (Ce) anomalies are observed in chondrite-normalized Rare Earth Element patterns from various volcanic arc suites. These anomalies are well defined in volcanic rocks from the Mariana arc and have been interpreted as the result of addition of subducted sediments to the arc magma sources. This study combines 143Nd/144Nd and 138Ce/142Ce isotope measurements in Mariana volcanic rocks that have Ce anomalies ranging from 0.97 to 0.90. The dataset includes sediments sampled immediately before subduction at the Mariana Trench (Sites 801 and 802 of ODP Leg 129) and primitive basalts from the Southern Mariana Trough (back-arc basin). Binary mixing models between the local depleted mantle and an enriched end-member using both types of sediment (biosiliceous and volcaniclastic) found in the sedimentary column in front of the arc are calculated. Marianas arc lavas have Ce and Nd isotopic compositions that require
- Subjects :
- Rare Earth Elements
010504 meteorology & atmospheric sciences
Geochemistry
138Ce/142Ce
Pyroclastic rock
Mariana volcanic arc
Ce anomalies
Sediment recycling
010502 geochemistry & geophysics
01 natural sciences
[SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Geochemistry and Petrology
Arc system
0105 earth and related environmental sciences
Basalt
geography
geography.geographical_feature_category
Volcanic arc
Subduction
Partial melting
Geology
Volcanic rock
13. Climate action
Mariana Trench
Subjects
Details
- Language :
- English
- ISSN :
- 00092541
- Database :
- OpenAIRE
- Journal :
- Chemical Geology, Chemical Geology, 2018, 500, pp.46-63. ⟨10.1016/j.chemgeo.2018.09.006⟩, Chemical Geology, Elsevier, 2018, 500, pp.46-63. ⟨10.1016/j.chemgeo.2018.09.006⟩
- Accession number :
- edsair.doi.dedup.....600a1b3a13096aab2d1e12a2fd7bb9d9