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Personen: Brenker, Frank E. (Autor) 
Vincze, Laszlo (Autor) 
Vekemans, Bart (Autor) 
Nasdala, Lutz (Autor) 
Stachel, Thomas (Autor) 
Vollmer, Christian (Autor) 
Kersten, Michael (Autor) 
Somogyi, Andrea (Autor) 
Adams, Freddy (Autor) 
Joswig, Werner (Autor) 
Harris, Jeff W. (Autor) 
Titel: Detection of a Ca-rich lithology in the Earth's deep (> 300 km) convecting mantle
Quelle: Earth and planetary science letters. Bd. 236. H. 3/4. Amsterdam u.a. : Elsevier. S. 579 - 587
Erscheinungsjahr:    2005
ISBN / ISSN: 0012-821X
URL der Originalveröffentlichung doi:10.1016/j.epsl.2005.05.021
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Person der Universität:    Nasdala, Lutz  In UnivIS suchen ; Kersten, Michael  In UnivIS suchen 
Einrichtung: Institut für Geowissenschaften
DDC-Sachgruppe:    Geowissenschaften
ID: 15423  Universitätsbibliothek Mainz
Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
Abstract: Earth%27s deep convecting upper mantle is believed to represent a rather homogenous geochemical reservoir of spinel or garnet lherzolite with primitive major element and moderately depleted trace element composition. Only where subduction occurs is this homogeneity disrupted by a suite of rocks ranging from eclogites/garnet pyroxenites (former oceanic crust) to residual harzburgites. In addition to these well documented peridotitic and metabasaltic rocks we have now discovered the presence of a chemically distinct reservoir in the deep convecting upper mantle. In situ structural analyses (micro X-ray diffraction and micro Raman spectroscopy) and three-dimensional trace element mapping (confocal micro X-ray fluorescence imaging) of polyphase inclusions in a diamond from Guinea that formed at about 300-360 km depth reveal the existence of a deep Ca-rich source, in the absence of several common mantle minerals, like olivine, garnet and low-Ca pyroxene. This reservoir may represent metasomatized oceanic lithosphere (rodingites, ophicarbonates) or metamorphosed carbonaceous sediments. (c) 2005 Elsevier B.V. All rights reserved.
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