A new approach to revealing the composition of kimberlite melts and their deep mantle source

Información del proyecto

KimberliteNewApproach

Identificador del acuerdo de subvención: 656954

DOI

10.3030/656954

Proyecto finalizado el 30 Enero 2017

Fecha de la firma de la CE 13 Marzo 2015

Fecha de inicio 1 Julio 2016

Fecha de finalización 30 Junio 2018

Financiado con arreglo a

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Coste total

€ 177 598,80

Aportación de la UE

€ 177 598,80

Coordinado por

STICHTING VU
Netherlands

Objetivo

The overarching aim of this project is to provide novel constraints on the composition of the Earth’s deep mantle, particularly its volatile content, by undertaking an innovative geochemical and isotopic study of the deepest formed melts on Earth: kimberlites. Kimberlite melts are derived from depths in excess of 150-200 km. They are important as the major host of diamonds and because entrain xenoliths (i.e. fragments) of upper mantle and deep crustal rocks during ascent to the surface, providing a major source of information about the geochemistry of the deep Earth. Despite their importance, the composition of primary kimberlite melts and their exact mantle source are hotly debated issues. This is due to contamination of kimberlite melts by mantle and crustal rocks during magma emplacement and near surface alteration of primary kimberlite mineralogy.
To determine the composition of primary kimberlite melts, I will employ a novel approach that combines radiogenic (Sr-Nd-Pb) and stable (C-O) isotope fingerprinting of melt inclusions in kimberlitic magmatic minerals (i.e. olivine and spinel), using innovative ultra-sensitive techniques. This approach will constrain if the carbonate-dominated melt inclusions truly represent examples of pristine kimberlite magma by quantifying processes like crustal contamination and degassing that may have altered the melt composition. I will investigate kimberlites from targeted localities from different parts of the world (South Africa, Canada, Greenland, Russia) and of variable age (Proterozoic to Cretaceous) to assess if there are spatial and/or temporal controls to kimberlite composition. The melt inclusions C-O isotope data, coupled with O isotope analyses of kimberlitic olivine, spinel and perovskite, are designed to test if recycled crustal material occurs in the deep mantle source of kimberlites, which would provide important new constraints on the global cycle of volatiles through geological time.

Ámbito científico (EuroSciVoc)

• ciencias naturales › ciencias de la tierra y ciencias ambientales conexas › geoquímica
• ciencias naturales › ciencias de la tierra y ciencias ambientales conexas › geología › petrología › petrología ígnea
• ciencias naturales › ciencias de la tierra y ciencias ambientales conexas › geología › mineralogía

Palabras clave

• kimberlite
• melt inclusions
• radiogenic isotopes
• stable isotopes
• volatiles
• crustal recycling
• carbonate melts
• TIMS

Programa(s)

• H2020-EU.1.3. - EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions PROGRAMA PRINCIPAL
  
• H2020-EU.1.3.2. - Nurturing excellence by means of cross-border and cross-sector mobility
  

Tema(s)

• MSCA-IF-2014-EF - Marie Skłodowska-Curie Individual Fellowships (IF-EF)
  

Régimen de financiación

MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)

Convocatoria de propuestas

H2020-MSCA-IF-2014

Coordinador

STICHTING VU

• Aportación neta de la UEn: € 177 598,80
• Dirección: DE BOELELAAN 1105 ; 1081 HV Amsterdam ; Países Bajos
• Tipo de actividad: Higher or Secondary Education Establishments
• Coste total: € 177 598,80