de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Contact usLogin
  Advanced SearchBrowse

Item


Journal Article

Released

Stofftransport in Subduktionszonen : Die leichten Elemente Lithium und Bor

Romer, R. L. (2017): Stofftransport in Subduktionszonen: Die leichten Elemente Lithium und Bor. - System Erde, 7, 1, pp. 62—65.
DOI: http://doi.org/10.2312/GFZ.syserde.07.01.10



http://gfzpublic.gfz-potsdam.de/pubman/item/escidoc:2208922
Resources
Authors
http://gfzpublic.gfz-potsdam.de/cone/persons/resource/romer

Romer ,  R. L.
Vol. 7, Issue 1 (2017), GFZ Journal 2017, System Erde : GFZ Journal, Deutsches GeoForschungsZentrum;
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Abstract
In the Earth’s subduction zones, some material from the down-going plate is transferred into the overlying mantle wedge and partly into subduction-related volcanic rocks. Lithium (Li) and boron (B) of subducted rocks, in particular of altered oceanic crust and siliciclastic sedimentary rocks, show a large and characteristic variation in their isotopic compositions. During progressive metamorphism and partial melting of the subducting material, Li and B are largely lost from the subducted rocks by fluid-mediated processes. The rising fluids eventually produce a geochemically and isotopically heterogeneous mantle wedge just above the subducting plate. The loss of Li and B from the down-going rocks is controlled by mineral stability in the subducting slab. Small-volume melts from this mantle wedge inherit the isotopic and chemical signature of the subducted material, i. e., of the altered oceanic crust and/or of siliciclastic sedimentary rocks. Thus, small-volume melts derived from the mantle wedge may reveal the nature of old sutures in orogenic belts.