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Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America
Nielsen, Sune G.1,2; Prytulak, Julie3; Blusztajn, Jerzy1,2; Shu, Yunchao1,2,4,5; Auro, Maureen1,2; Regelous, Marcel6; Walker, Jim7
2017-06-01
Source PublicationJOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
Volume339Pages:23-40
SubtypeArticle
AbstractSediment is actively being subducted in every convergent margin worldwide. Yet, geochemical data for arc lavas from several subduction zones, such as Northern Tonga and Costa Rica have revealed either attenuated or limited evidence for sediment in their mantle source regions. Here we use thallium (Tl) isotopes to trace slab components in lavas from the Tonga-Kermadec and Central American arcs. In general, both arcs display Tl isotope data that are most compatible with addition of sediment to the sub-arc mantle from the subducting slab. This evidence is particular strong in the Tonga-Kermadec arc where pelagic clays dominate the Tl budget along the entire arc. Contributions from altered oceanic crust as well as the Louisville Seamount chain that subducts underneath Northern Tonga are not visible in Tl isotopes, which is likely due to the very high Tl concentrations found in pelagic sediments outboard of the Tonga-Kermadec arc. Lavas from Central America reveal variable and systematic Tl isotope compositions along-strike. In particular, lavas from Nicaragua are dominated by contributions from sediments, whereas Costa Rican samples reveal a significant altered oceanic crust component with little influence from sediments on thallium isotope composition. The absence of a sediment signature in Costa Rica corresponds with the Cocos Ridge and the seamount province subduction, which results in a thinner sediment cover. Furthermore, the subducted sediment is dominated by carbonates with very low Tl concentrations and, therefore, small amounts of carbonate sediment added to the mantle wedge do not contribute significantly to the overall Tl budget.
DOI10.1016/j.jvolgeores.2017.04.024
Indexed BySCI
Language英语
WOS IDWOS:000404315400002
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/137138
Collection海洋地质与环境重点实验室
Affiliation1.Woods Hole Oceanog Inst, NIRVANA Labs, Woods Hole, MA 02543 USA
2.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
3.Imperial Coll London, Dept Earth Sci & Engn, London, England
4.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
6.Friedrich Alexander Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Erlangen, Germany
7.Northern Illinois Univ, Dept Geol & Environm Geosci, De Kalb, IL USA
Recommended Citation
GB/T 7714
Nielsen, Sune G.,Prytulak, Julie,Blusztajn, Jerzy,et al. Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America[J]. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,2017,339:23-40.
APA Nielsen, Sune G..,Prytulak, Julie.,Blusztajn, Jerzy.,Shu, Yunchao.,Auro, Maureen.,...&Walker, Jim.(2017).Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America.JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH,339,23-40.
MLA Nielsen, Sune G.,et al."Thallium isotopes as tracers of recycled materials in subduction zones: Review and new data for lavas from Tonga-Kermadec and Central America".JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 339(2017):23-40.
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