Sökning: "crust"

Visar resultat 21 - 25 av 143 avhandlingar innehållade ordet crust.

  1. 21. Analyses of Seismic Wave Conversion in the Crust and Upper Mantle beneath the Baltic Shield

    Författare :Sverker Olsson; Roland Roberts; Hans Thybo; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geophysics; converted waves; Moho; upper mantle; Baltic Shield; tomography; anisotropy; receiver function; Geofysik;

    Sammanfattning : Teleseismic data recorded by broad-band seismic stations in the Swedish National Seismic Network (SNSN) have been used in a suite of studies of seismic wave conversion in order to assess the structure of the crust and upper mantle beneath the Baltic Shield. Signals of seismic waves converted between P and S at seismic discontinuities within the Earth carry information on the velocity contrast at the converting interface, on the depth of conversion and on P and S velocities above this depth. LÄS MER

  3. 22. Experimental model study of the evolution of rift valley systems and fracture patterns in the crust

    Författare :Genene Mulugeta; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 23. New Zircon geochronological and Nd isotopic evidence for Neoproterozoic crust reworking events in the Abas terrane, Yemen

    Författare :Fitsum Girum Yeshanew; Victoria Pease; Martin Whitehouse; Hugh Rollinson; Kjell Billström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Precambrian; Arabian Shield; magmatism; U-Pb; zircon; post-collisional magmatism; Nd isotopes; Geology; geologi;

    Sammanfattning : The Arabian-Nubian Shield is an excellent natural laboratory to study crust formation processes during the Neoproterozoic. It is one of the largest juvenile tracts of continental crust formed during this time. It diachronously evolved between the breakup of Rodinia (c.780 Ma) and amalgamation of Gondwana (c. LÄS MER

  5. 24. Controlled-source tensor magnetotellurics and its application to the detection of azimuthal anisotropy in the earth's crust

    Författare :Xiaobo Li; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  7. 25. Hydrothermal mobilisation of Au and other metals in the oceanic crust: Implications for the formation of VMS deposits

    Författare :Clifford Patten; Iain Pitcairn; Rodney Allen; Alasdair Skelton; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ODP Hole 1256D; hydrothermal fluids; seawater-derived fluids; hydrothermal alteration; metal mobility; volcanic massive sulphide deposit;

    Sammanfattning : .... LÄS MER