Sökning: "Ar-Ar dating"

Hittade 4 uppsatser innehållade orden Ar-Ar dating.

1. 1. Radiogenic Dating and Microstructure Analysis of Shear Zones Found Within the Seve Nappe Complex in the Åre Region, Jämtland, Scandinavian Caledonides

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Cameron Alessandrini; [2017]
   Nyckelord :Rb-Sr dating; Ar-Ar dating; Lower Seve Nappe; Scandinavian Caledonides; COSC drillhole.; Rb-Sr datering; Ar-Ar datering; Seveskollan; skandinaviska Kaledoniderna; vit glimmer; COSC borrkärna.;

   Sammanfattning : The North Atlantic Caledonides are a continent-continent collision type orogeny found in WesternScandinavia, Svalbard, Greenland and the British Isles. They are thought to have formed as a result of a complex history consisting of repeated ocean opening and closure. LÄS MER

3. 2. Pressure-Temperature-time Constraints on the Deep Subduction of the Seve Nappe Complex in Jämtland and southern Västerbotten, Scandinavian Caledonides

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Johanna Holmberg; [2017]
   Nyckelord :Seve Nappe Complex; COSC-1; Raman spectroscopy; QuiG barometry; kyanite-garnet gneiss; Lu-Hf garnet geochronology; Seveskollan; COSC-1; Raman spektroskopering; QuiG barometri; kyanit-granatförande gnejs; Lu-Hf granat geokronologi;

   Sammanfattning : The Scandinavian Caledonides are defined by long transported thrust sheets emplaced in a nappe stratigraphic succession onto the Paleozoic Baltica platform, as a result of the collision between the paleo-continents Baltica and Laurentia. This Palaeozoic collisional orogen is nowadays exposed at mid-crustal levels, thus provides an excellent ground for in situ studies of mountain building processes. LÄS MER

4. 3. Field relations, petrography and 40Ar/39Ar cooling ages of hornblende in a part of the eclogite-bearing domain, Sveconorwegian Orogen

   Master-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Nasim Mozafari Amiri; [2013]
   Nyckelord :Sveconorwegian; retrograde metamorphism; eclogite; Svarten Zone; ductile deformation; Ar-Ar dating.; Earth and Environmental Sciences;

   Sammanfattning : High-pressure metamorphism and deformation of the Ullared Deformation Zone (UDZ) in the Eastern segment of the Sveconorwegian Orogen, southwest Sweden is evidenced by ~ 970 Ma retro-eclogite found in association with upper amphibolite and high-pressure granulite facies rocks. Petrographic, structural and geochronological studies of the UDZ were carried out to better understand the regional metamorphism and deformation history with focus on a ~N-S trending part of the zone influenced by a late stage of deformation during Sveconorwegian orogeny, namely the Svarten Zone. LÄS MER

5. 4. En paleomagnetisk detaljstudie av Sarekgångsvärmen

   Magister-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Erik Eneroth; [2000]
   Nyckelord :palaeomagnetism; Seve Nappe Complex; northern Swedish Caledonides; extensional environments; continent-ocean transition; dolerite; sheeted dyke complex; Earth and Environmental Sciences;

   Sammanfattning : Populärvetenskaplig sammanfattning: Vid Favorithällen i Sareks Nationalpark i Norra Lappland finns bergarter som bildades på havets botten för ca 600 miljoner år sedan (i slutet av prekambrium). I det skedet var berggrunden på väg att dras isär i samband med att en ny ocean bildades. Tjocka sedimentpackar med bl.a. LÄS MER