Sökning: "tidig Jura"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden tidig Jura.

1. 1. Record of the end-Triassic mass extinction in shallow marine carbonates: the Lorüns section (Austria)

   Master-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Linus Brakebusch; [2022]
   Nyckelord :sedimentology; geochemistry; ooids; oolites; oncoids; oncolites; Triassic; Jurassic; Rhaetian; Hettangian; ocean acidification; Earth and Environmental Sciences;

   Sammanfattning : The end-Triassic mass extinction (ETE) was one of the five big mass extinctions of the Phanerozoic and occurred ~201 Ma ago. Research agrees that the main triggering factor for the ETE was the eruptions of the Central Atlantic Magmatic Volcanic Province (CAMP), linked to the break-up of the supercontinent Pangaea. LÄS MER

3. 2. Embryologi och tidig ontogeni hos mesozoiska fisködlor (Ichthyopterygia)

   Kandidat-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Susanna Perneby Molin; [2016]
   Nyckelord :fisködlor; embryo; ontogeni; jura; Holzmaden; Earth and Environmental Sciences;

   Sammanfattning : Ichthyosaurs (‘fish lizards’) are a group of marine reptiles that lived during the Mesozoic Era. They are all included in the superorder Ichthyopterygia, which consists of at least 36 genera and 80 species. LÄS MER

4. 3. An Analysis and Interpretation of the Geoscience BC Trek Project Till Geochemical and Mineralogical Data to Determine the Surficial Geochemical Expression of Bedrock Au-Ag-Cu-Mo Mineralization on the Nechako Plateau, British Columbia, Canada.

   Kandidat-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Karin Öberg; [2016]
   Nyckelord :British Columbia; till; gold; copper; mineralization; British Columbia; morän; mineralisering; guld; koppar;

   Sammanfattning : The mineral exploration in the interior of British Columbia is challenged by an extensive coverage of glacial sediments. The Geoscience British Columbia (GBC) Targeting Resources through Exploration and Knowledge (TREK) Survey has since 2013 collected till samples in the northern interior plateau of British Columbia, covering an area of approximately 25,000km2. LÄS MER

5. 4. Sedimentological study of the Jurassic and Cretaceous sequence in the Revinge-1 core, Scania

   Master-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Casandra Hajny; [2016]
   Nyckelord :Jura; Krita; Vomb; Fyledalen; Vitabäck; Arnagergrönsand; Mollusker; Bivalver; Palynologi; Biostra-tigrafi; Vulkanism; Pyrit; Järnooider; Jurassic; Cretaceous; Vomb Trough; Vitabäck Clay; Fyledal Clay; Arnager Greensand; Molluscs; Bivalves; Palynology; Biostratigraphy; Volcanism; Pyrite; Iron ooids; Earth and Environmental Sciences;

   Sammanfattning : This thesis presents a study of the core from the Revinge-1 borehole from the Vomb Trough. The core displays strata from the Upper Jurassic to the Upper Cretaceous including strata covering the the J/K−boundary . LÄS MER

7. 5. The Jurassic extinction events and its relation to CO2 levels in the atmosphere : a case study on Early Jurassic fossil leaves

   Kandidat-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Liina Santasalo; [2013]
   Nyckelord :conifers; Pliensbachian; Australian; Early Jurassic; stomatal proxy; palaeo-CO2; koldioxidhalt; klimat; Australien; tidig Jura; Marburg subgroup; Allocladus helgei; stomata index; CO2; Earth and Environmental Sciences;

   Sammanfattning : The Mesozoic was a so-called “hothouse” time period in Earth’s history, with high concentrations of atmospheric CO2 and elevated temperatures, but the exact climate evolution is not fully known for the entire inter-val. The Early Jurassic for instance is believed to have been a warm period, flanked by two episodes of extremely high CO2, coinciding with environmental degradation and mass extinctions: the Triassic-Jurassic (200 Ma) and the early Toarcian (183 Ma) mass extinction events. LÄS MER