Drying and dying of a subducted slab: Coupled Li and B isotope variations in Western Anatolia Cenozoic Volcanism

被引：88

作者：

Agostini, Samuele ^{[1
]}

Ryan, Jeffrey G. ^{[2
]}

Tonarini, Sonia ^{[1
]}

Innocenti, Fabrizio ^{[1
,3
]}

机构：

[1] CNR, Ist Geosci & Georisorse, Via G Moruzzi 1, I-56124 Pisa, Italy

[2] Univ S Florida, Dept Geol, Tampa, FL 33620 USA

[3] Univ Pisa, Dipartimento Sci Terra, Pisa, Italy

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2008年 / 272卷 / 1-2期

关键词：

Li isotopes; slab dehydration; Cenozoic valcanism; Mediterranean area;

D O I：

10.1016/j.epsl.2008.04.032

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

In lavas spanning similar to 10Ma of subduction-related volcanism in Western Anatolia, we observe remarkably similar patterns of delta Li-7 and delta(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 sunduction. Subsequent rift-related intraplate magmatism record delta Li-7 signatures within the range observed for MORBs and OIBs, indicating an abrupt transition to a mantle source unmodified by subduction. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：139 / 147

页数：9

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