Sökning: "alteration zonation"

Hittade 4 uppsatser innehållade orden alteration zonation.

  1. 1. Go with the flow - can environmental flows save us? : A study of the flow patterns in Bredforsen and possibilities for the future

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Hilda Brynjarsdotter; [2022]
    Nyckelord :Riparian zone; Riparian vegetation; Riparian vegetation zones; Regulated rivers; Floodings; hydropower;

    Sammanfattning : Freshwater systems have, during human history, endured large-scale impacts. According to the water framework directive, measures must be developed to create a better environment for species in, and connected to, freshwater systems. Hydropower plants has caused loss of natural disturbance (e.g. LÄS MER

  3. 2. Volcanic facies and hydrothermal alteration at the Norra volcanigenic massive sulfide deposit : Storuman area, Sweden

    Master-uppsats, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Författare :Meseret Gebreyesus; [2020]
    Nyckelord :Volcanic massive sulfide deposit; alteration zonation; volcanic chemostratigraphy; facies architecture;

    Sammanfattning : The Skellefte District, with a long and rich history of base metal extraction that commenced asearly as 1924, is rated amongst the leading mining provinces in Sweden and Europe. The districtrepresents a Paleoproterozoic volcanic arc hosting more than 85 known (gold-bearing) VMSdeposits and several economic grade orogenic gold occurrences. LÄS MER

  4. 3. Characterization of the Hydrothermal Alteration around the Björkdal Au Deposit, Skellefte District, Sweden

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Geovetenskap och miljöteknik

    Författare :Madeleine Erneholm; [2017]
    Nyckelord :Gold Ore; Mine; Skellefte District; Sweden; Quartz Lode; Hydrothermal Alteration; Petrography; Lithogeochemistry; Intrusion-related Gold;

    Sammanfattning : Sixteen samples from 8 locations within and surrounding the Björkdal mine area in northern Sweden were chosen in order to reevaluate and characterize previous interpretations of the lithology and hydrothermal alteration. Geochemical analysis by ICP-MS was made in order to chemically classify the lithology of the area and petrological studies were made by study of thin sections and core logging. LÄS MER

  5. 4. The spore record of early land plants from upper Silurian strata in Klinta 1 well, Skåne, Sweden

    Master-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Kristina Mehlqvist; [2009]
    Nyckelord :Silurian; spores; flora; palynology; Klinta 1 drillcore; silur; sporer; palynologi; Klinta borrkärna 1; Earth and Environmental Sciences;

    Sammanfattning : Prover från Öved-Ramsåsagruppen i Skåne från övre Silur har undersökts palynologiskt, främst med avseende på sporer från landväxter. Sedimenten består av karbonater med silisiklastiskt innehåll och paleomiljön har tolkats till ett strandnära marint ekosystem. LÄS MER