Sökning: "Tectonic evolution"

Visar resultat 1 - 5 av 45 avhandlingar innehållade orden Tectonic evolution.

1. 1. Tectonic evolution of NW Svalbard

   Författare :Carl Pettersson; Stockholms universitet; []
   Nyckelord :Svalbard; Migmatization; Zircon; Provenance;

   Sammanfattning : The Neoproterozoic is a remarkable era in Earth’s history with dramatic variations in climate and biota, possibly resulting in global glaciations events (eg. “snowball earth”, Kirschvink, 1992) and the first appearance of metazoans (Conway Morris, 1993). LÄS MER

3. 2. Tectonic evolution of NW Svalbard

   Författare :Carl-Henrik Pettersson; Stockholms universitet; []
   Nyckelord :;

   Sammanfattning : .... LÄS MER

4. 3. Tectonic Evolution of the Zagros Suture-and Imbricate Zones in Iraq

   Författare :Maher T. Zainy; Maria Ask; Francisco Gomez; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Tectonic evolution; Zagros Fold-and Thrust Belt; Remote sensing; Field feological work; 3D geological modelling; Natural resources exploration; Applied Geology; Tillämpad geologi;

   Sammanfattning : Orogenic belts are expressions of tectonic activity, often host various natural resources (e.g. petroleum and minerals reserves), and influence the society and environment through hazards (e.g. LÄS MER

5. 4. Ocean chemistry and the evolution of multicellularity

   Författare :Emma U. Hammarlund; Stefan Bengtson; Donald Canfield; Nils Holm; Graham Budd; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Geochemistry; biology; paleontology; evolution; multicellularity; geokemi; Geochemistry;

   Sammanfattning : Oxygen has been assumed to be a vital trigger for the evolution of multicellular life forms on Earth, partly based on its power to promote substantial energy flux in cell respiration and partly as biosynthesis of compounds like collagen require oxygen. However, the co-evolution of large life and the Earth’s chemical environment is not well understood at present, and there is particular disagreement in the field about whether the Cambrian explosion of animal life forms was a chemical or biological event. LÄS MER

7. 5. The tectonic evolution of northwest Svalbard

   Författare :Carl Henrik Pettersson; Victoria Pease; Robert Strachan; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Svalbard; Rodinia; Laurentia; Zircon; Provenance; Migmatites; Clockwise P-T; Solid earth geology and petrology; Berggrundsgeologi och petrologi; Geology; geologi;

   Sammanfattning : Svalbard represents the uplifted and exhumed northwest corner of the Barents Sea Shelf. Pre-Carboniferous rocks of Svalbard are divided into the Eastern, Northwestern and Southwestern Terranes, were amalgamated during the Caledonian Orogen and are separated by north-south-trending strike-slip faults. LÄS MER