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Showing result 1 - 5 of 12 essays matching the above criteria.

1. 1. Baggalútar from Hvalfjörður (Iceland): Enigmatic spheroids of hydrothermally altered basaltic tephra

   University essay from Uppsala universitet/Mineralogi, petrologi och tektonik

   Author : Emmie Djuse; [2022]
   Keywords : Baggalútar; Iceland; basalt; Hvalfjörður; zeolites; volcanic spherulite; spheroids; Baggalútar; Island; basalt; Hvalfjörður; zeoliter; vulkaniska sfäruliter; sfäroider;

   Abstract : Baggalútar are well-rounded spheroids that typically measures 16-18 mm in size and have a brownreddish appearance. They can be found in the Hvalfjörður bay in SW Iceland. READ MORE

3. 2. Reconstructing Past Climate by Grain Size and Magnetic Susceptibility Analysis of Belgium Loess From the Late Quaternary

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Susanna Åberg; [2022]
   Keywords : aeolian dust; Romont; Europe; true loess line; past climate reconstruction; vindtransporterat stoft; Romont; Europa; true loess line; rekonstruktion av tidigare klimat;

   Abstract : Aeolian dust that gets deposited builds up loess sequences that cover 10% of the Earth's continents. Such sequences can be several metres thick with material deposited over thousands of years, and therefore act like archives of past climates. READ MORE

4. 3. Diatoms from the late Holocene of the western Chukchi Sea, Arctic Ocean: environmental signals and palaeoceanography

   University essay from Stockholms universitet/Institutionen för geologiska vetenskaper

   Author : Erik Browaldh; [2022]
   Keywords : diatoms; late holocene; SWERUS-L2-2-PC1; Herald Canyon; Chukchi Sea; ice-algae; sympagic; cryophilic; warm water diatom; Bering Sea Water species; bottom water temperature; BWT; benthic foraminifera; palaeothermometry; ice dynamics; Fragilariopsis; Fossula arctica; Paralia sulcata; Shionodiscus oestrupii; Thalassiosira simonsenii; Chaetoceros; Chaetoceros sp. 7;

   Abstract : The sediment Core SWERUS-L2-2-PC1 (2PC) retrieved from the Chukchi Sea, Arctic Ocean sits in an oceanographically dynamic location at the Arctic-Pacific Ocean gateway. The 8.3 m-long core was retrieved in Herald Canyon at the marginal ice zone at 57 m depth. READ MORE

5. 4. Assessing the late Holocene14C reservoir age of theChukchi Sea with the AniakchakCFE II tephra 3.6 kyr BP

   University essay from Stockholms universitet/Institutionen för naturgeografi

   Author : Alexis Geels; [2019]
   Keywords : Cryptotephra; Aniakchak CFE II; Arctic Ocean; Chukchi Sea; Marine Reservoir Effect;

   Abstract : Tephrochronology is a powerful tool to correlate and improve the chronology of sedimentaryarchives in the Arctic Ocean. The Aniakchak Caldera Forming Eruption (CFE) in Alaska at3.6 cal kyr BP ejected ash that were found in a widespread layer in Alaska, and as cryptotephrain the Chukchi Sea, Newfoundland, and Greenland. READ MORE

6. 5. Towards a Tephrochronology for the Lakselv Peat Sequence in Finnmark County, Northern Norway

   University essay from Stockholms universitet/Institutionen för naturgeografi

   Author : Anny Höglund; [2017]
   Keywords : Tephra; Tephrochronology; Lakselv; Norway; Jan Mayen; São Miguel; Electron Microprobe Analysis; Density Separation;

   Abstract : To provide an increased breadth in the knowledge of tephra dispersal, this pilot study examines a peat core from Lakselv in Finnmark County in northern Norway. Peat samples are exposed to burning, HCl, density separation and polarized light microscopy. One sample from a depth of 37.5-40 cm was analysed using an electron microprobe analyser (EMPA). READ MORE