Drying and Dying of a Subducted Slab: Coupled Li and B Isotope Variations in Western Anatolia Cenozoic Volcanism

Samuele Agostini; Jeffrey G. Ryan; Sonia Tonarini; Fabrizio Innocenti

doi:10.1016/j.epsl.2008.04.032

Drying and Dying of a Subducted Slab: Coupled Li and B Isotope Variations in Western Anatolia Cenozoic Volcanism

Samuele Agostini, Jeffrey G. Ryan, Sonia Tonarini, Fabrizio Innocenti

School of Geosciences

Research output: Contribution to journal › Article › peer-review

Abstract

In lavas spanning ~ 10Ma of subduction-related volcanism in Western Anatolia, we observe remarkably similar patterns of δ ⁷ Li and δ ¹¹ B variation. In this setting, magmatism records a transition from calc–alkaline to ultrapotassic character, consistent with overall lower mean extents of melting, and a changing mantle source that reflects a fractionating, higher temperature slab input consistent with the gradual cessation of subduction. Subsequent rift-related intraplate magmatism record δ ⁷ Li signatures within the range observed for MORBs and OIBs, indicating an abrupt transition to a mantle source unmodified by subduction.

Original language	American English
Journal	Earth and Planetary Science Letters
Volume	272
DOIs	https://doi.org/10.1016/j.epsl.2008.04.032
State	Published - Jul 1 2008

Keywords

Li isotopes
slab dehydration
Cenozoic volcanism
Mediterranean area

Disciplines

Earth Sciences
Geology
Physical Sciences and Mathematics

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10.1016/j.epsl.2008.04.032License: CC BY

https://doi.org/10.1016/j.epsl.2008.04.032

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title = "Drying and Dying of a Subducted Slab: Coupled Li and B Isotope Variations in Western Anatolia Cenozoic Volcanism",

abstract = " In lavas spanning ~ 10Ma of subduction-related volcanism in Western Anatolia, we observe remarkably similar patterns of δ 7 Li and δ 11 B variation. In this setting, magmatism records a transition from calc–alkaline to ultrapotassic character, consistent with overall lower mean extents of melting, and a changing mantle source that reflects a fractionating, higher temperature slab input consistent with the gradual cessation of subduction. Subsequent rift-related intraplate magmatism record δ 7 Li signatures within the range observed for MORBs and OIBs, indicating an abrupt transition to a mantle source unmodified by subduction.",

keywords = "Li isotopes, slab dehydration, Cenozoic volcanism, Mediterranean area",

author = "Samuele Agostini and Ryan, {Jeffrey G.} and Sonia Tonarini and Fabrizio Innocenti",

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doi = "10.1016/j.epsl.2008.04.032",

language = "American English",

volume = "272",

journal = "Earth and Planetary Science Letters",

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T1 - Drying and Dying of a Subducted Slab: Coupled Li and B Isotope Variations in Western Anatolia Cenozoic Volcanism

AU - Agostini, Samuele

AU - Ryan, Jeffrey G.

AU - Tonarini, Sonia

AU - Innocenti, Fabrizio

PY - 2008/7/1

Y1 - 2008/7/1

N2 - In lavas spanning ~ 10Ma of subduction-related volcanism in Western Anatolia, we observe remarkably similar patterns of δ 7 Li and δ 11 B variation. In this setting, magmatism records a transition from calc–alkaline to ultrapotassic character, consistent with overall lower mean extents of melting, and a changing mantle source that reflects a fractionating, higher temperature slab input consistent with the gradual cessation of subduction. Subsequent rift-related intraplate magmatism record δ 7 Li signatures within the range observed for MORBs and OIBs, indicating an abrupt transition to a mantle source unmodified by subduction.

AB - In lavas spanning ~ 10Ma of subduction-related volcanism in Western Anatolia, we observe remarkably similar patterns of δ 7 Li and δ 11 B variation. In this setting, magmatism records a transition from calc–alkaline to ultrapotassic character, consistent with overall lower mean extents of melting, and a changing mantle source that reflects a fractionating, higher temperature slab input consistent with the gradual cessation of subduction. Subsequent rift-related intraplate magmatism record δ 7 Li signatures within the range observed for MORBs and OIBs, indicating an abrupt transition to a mantle source unmodified by subduction.

KW - Li isotopes

KW - slab dehydration

KW - Cenozoic volcanism

KW - Mediterranean area

UR - https://digitalcommons.usf.edu/gly_facpub/132

UR - https://doi.org/10.1016/j.epsl.2008.04.032

U2 - 10.1016/j.epsl.2008.04.032

DO - 10.1016/j.epsl.2008.04.032

M3 - Article

VL - 272

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

ER -

Drying and Dying of a Subducted Slab: Coupled Li and B Isotope Variations in Western Anatolia Cenozoic Volcanism

Abstract

Keywords

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