Sökning: "sfäruler"

Hittade 3 uppsatser innehållade ordet sfäruler.

  1. 1. Microspherules from the lowermost Ordovician in Scania, Sweden : affinity and taphonomy

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Jan Ulmius; [2010]
    Nyckelord :Ordovician; microfossil; embryo; pyrite; apatite; pyritisation; phosphatisation; carbonisation; Alum Shale Formation; Sweden; Ordovicium; mikrofossil; pyrit; apatit; pyritisering; fosfatbildning; kolbildning; alunskiffer; Sverige; Earth and Environmental Sciences;

    Sammanfattning : Microscopic spherules, 0.1-0.5 mm in diameter, from the lowermost Ordovician Rhabdinopora flabelliforme parabola graptolite Zone of the Alum Shale Formation in Södra Sandby, Scania, southern Sweden, have been investigated. LÄS MER

  3. 2. Spinel group minerals in carbonaceous and ordinary chondrites

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :My Riebe; [2009]
    Nyckelord :spinel group minerals; carbonaceous chondrites; ordinary chondrites; spinellgruppmineral; kolkondriter; ordinära kondriter; Earth and Environmental Sciences;

    Sammanfattning : Meteorites are easily altered in the oxygen-rich environment on the Earth surface. Fossil meteorites are thus uncommon and in the ones, which are found, almost all minerals are secondary. However, the spinel group mineral chromite is resistant to alteration and has successfully been used as a proxy for ordinary chondrites in sediment. LÄS MER

  4. 3. Extraterrestrisk och terrestrisk kromrik spinell i fanerozoiska kondenserade sediment

    Magister-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Maria Nolvi; Gunilla Thorelli; [2006]
    Nyckelord :physical geography; condensed sediments; cyclic sedimentation; spherules; chrome spinels; extraterrestrial chromite; cyklisk sedimentation; kondenserade sediment; sfäruler; kromspineller; geomorphology; pedology; cartography; climatology; naturgeografi; geomorfologi; marklära; kartografi; klimatologi; extraterrestrisk kromit; Earth and Environmental Sciences;

    Sammanfattning : This study aims to assess the normal inflow of extraterrestrial chromite to Earth. The results from the investigation are compared to earlier studies of middle Ordovician Orthoceratite Limestone in which 1 - 3 extraterrestrial chromite grains ( >63 ƒÊm ) per kilogram limestone were found. LÄS MER