Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 401960
Title Geophysical evidence for chemical variations in the Australian continental mantle
Author(s) Gerven, L.P.A. van; Deschamps, F.; Hilst, R.D.
Source Geophysical Research Letters 31 (2004)17. - ISSN 0094-8276
Department(s) CWC - Integrated Water Resources Management
Publication type Refereed Article in a scientific journal
Publication year 2004
Keyword(s) uppermost mantle - gravity-field - flow models - tectosphere - inversion - heterogeneity - lithosphere - observables - temperature - tomography
Abstract The relative density-to-shear velocity scaling (¿) provides a diagnostic for the presence of compositional variations in the mantle. We invert shear-wave velocity from a recent 3-D model and gravity anomalies for radial profiles of ¿ of the uppermost mantle beneath Australia. We performed calculations for the three major tectonic provinces that constitute the continent, and found significant differences between them. The ¿ profile for the Phanerozoic region can be explained by thermal variations alone. In contrast, negative values of ¿ suggest that variations in composition are important between ~75 and ~150 km depth in the Proterozoic continental lithosphere (central Australia). It is likely that chemical variations are also required to explain the inferences for the Archean craton (west Australia), but poor tomographic resolution precludes a definitive conclusion. The scaling factors found are consistent with chemical depletion of deep Precambrian lithosphere, which supports a tectosphere model for the Australian continental roots
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