Essays about: "lithology"

Showing result 21 - 25 of 34 essays containing the word lithology.

1. 21. Constraining Crustal Volatile Release in Magmatic Conduits by Synchrotron X-ray μ-CT

   University essay from Berggrundsgeologi

   Author : Sylvia Berg; [2011]
   Keywords : xenoliths; crustal gases; synchrotron X-ray μ-CT; 3D-bubble networks; gas migration; magmatic volatile budget; explosive eruption;

   Abstract : Magma-crust interaction in magma reservoirs and conduits is a crucial process during magma evolution and ascent. This interaction is recorded by crustal xenoliths that frequently show partial melting, inflation and disintegration textures. READ MORE

3. 22. Disintegration and Devolatilisation of Sandstone Xenolith in Magmatic Conduits: an Experimental Approach

   University essay from Berggrundsgeologi

   Author : Sylvia Berg; [2010]
   Keywords : xenolith; melting; bubbles; gas migration; crustal volatiles; magma-crust interaction; magma volatile budget; explosive eruption;

   Abstract : Xenoliths preserve evidence of magma-crust interactions in magmatic reservoirs and conduits. They reveal processes of partial melting of country rock, and disintegration into magma. Widespread evidence for frothy xenoliths in volcanic deposits exists, and these evidently indicate processes of gas liberation, bubble nucleation and bubble growth. READ MORE

4. 23. Shallow landslide susceptibility : modelling and validation

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Edgar Pimiento Chamorro; [2010]
   Keywords : landslide susceptibility; weights of evidence; logistic regression; ROC plot AUC; validation; Earth and Environmental Sciences;

   Abstract : Rainfall frequently triggers shallow landslides in mountainous areas worldwide. Landslide susceptibility maps express the probability of occurrence of landslides based on terrain conditions; they are useful for disaster prevention and land use planning. READ MORE

5. 24. From red to grey and back again : a detailed study of the lower Kundan (Middle Ordovician) 'Täljsten' interval and its enclosing strata in Västergötland, Sweden

   University essay from Lunds universitet/Geologiska institutionen

   Author : Anders Lindskog; [2010]
   Keywords : täljsten; lithology; faunal changes; Lanna Limestone; Holen Limestone; Kinnekulle; Hällekis; Thorsberg; Ordovician; Sweden; lannakalkstenen; holenkalkstenen; mellanordovicium; Sverige; Earth and Environmental Sciences;

   Abstract : Lithologic and faunal characteristics of the anomalous lower Kundan (Darriwilian, Middle Ordovician) 'Täljsten' limestone interval and its enclosing strata have been studied at Kinnekulle (Västergötland, south-central Sweden). A 2.6 m thick rock succession has been sampled, resulting in thin-sections and acid-insoluble residues. READ MORE

6. 25. Changes in beyrichiid ostracode faunas during the Late Silurian Lau Event on Gotland, Sweden

   University essay from Lunds universitet/Geologiska institutionen

   Author : Rebecka Rääf; [2010]
   Keywords : Gotland; Late Silurian; Lau Event; ostracodes; Beyrichiidae; faunal turnovers; Sensilur; Laukatastrofen; ostrakoder; beyrichiider; faunaförändringar; Earth and Environmental Sciences;

   Abstract : This paper deals with how palaeocope ostracodes of the family Beyrichiidae, from the Silurian strata at Gotland were affected by the Late Silurian Lau Event. The Lau Event is associated with a positive carbon isotope excursion, lithology changes and faunal changes in accumulated strata related to sea-level changes and a glaciation in the Late Ludlow. READ MORE