Essays about: "detrital zircon"

Found 4 essays containing the words detrital zircon.

  1. 1. Single-Grain Zircon U-Pb Dating and Magnetic Susceptibility of Polish Loess to Determine Late Quaternary Dust Provenance and Paleoclimate

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Alexandra Engström Johansson; [2018]
    Keywords : dust provenance; Polish loess; paleoclimate; single-grain zircon U-Pb dating; magnetic susceptibility; härkomstområden för atmosfäriskt stoft; polsk lössjord; paleoklimat; U-Pb datering av zirkoner; magnetisk susceptibilitet;

    Abstract : Windblown mineral dust has accumulated into thick loess layers across the European continent. Loess deposits are valuable paleoclimatic archives as they record climate change on centennial- to glacialinterglacial timescales. READ MORE

  3. 2. Understanding igneous processes through zircon trace element systematics : prospects and pitfalls

    University essay from Lunds universitet/Geologiska institutionen

    Author : Marín Ósk Hafnadóttir; [2014]
    Keywords : plagioclase fractionation. zirkon; hydrothermal alteration; precambrian; zircon; Ghana; hydrotermal-omvandling; plagioklasfraktionering; Earth and Environmental Sciences;

    Abstract : Zirkon från magmatiska bergarter extraherades från fem granitoider i Birimianterrängen i Ghana., och detritala zirkoner provtogs från sex platser i centrala Västgrönland. Av dessa härrör en population från palaeoproterozoikum i Prøvens magmatiska komplex. READ MORE

  4. 3. U-Pb, O and Lu-Hf isotope ratios of detrital zircon from Ghana, West-African Craton : formation of juvenile, Palaeoproterozoic crust

    University essay from Lunds universitet/Geologiska institutionen

    Author : Bára Dröfn Kristinsdóttir; [2013]
    Keywords : Hf-Model ages; West African Craton; detrital zircon; Ghana; crustal growth; Earth and Environmental Sciences;

    Abstract : Detrital zircon were sampled from five rivers in Ghana and they were analysed in situ for U-Th-Pb, O and Lu-Hf isotopes. Based on the analyses, their U-Pb crystallisation ages, δ18O isotope ratio, εHf and Hf-model ages were determined. This provides information about the origin and crustal evolution of the Palaeoproterozoic bedrock in Ghana. READ MORE

  5. 4. Internal structures in detrital zircons from Hamrånge: a study of cathodoluminescence and back-scattered electron images

    University essay from Lunds universitet/Geologiska institutionen

    Author : Karolina Bjärnborg; [2008]
    Keywords : zircons; internal structures; BSE; CL; Hamrånge; zirkoner; inre strukturer; zonering; metamiktisering; Earth and Environmental Sciences;

    Abstract : Syftet med denna studie var att extrahera och undersöka de inre strukturerna hos zirkoner från skifferprover insamlade i Hamrångeområdet, norr om Gävle,. Fyra prover från tre olika lokaler valdes ut för undersökningen. Studierna genomfördes med optiskt mikroskop samt svepelektronmikroskop, där back-scatter och katodluminescens användes. READ MORE