Essays about: "kondriter"

Found 5 essays containing the word kondriter.

1. 1. Chrome spinel grains from the Komstad Limestone Formation, Killeröd, southern Sweden : a high-resolution study of an increased meteorite flux in the Middle Ordovician

   University essay from Lunds universitet/Geologiska institutionen

   Author : Ellinor Martin; [2014]
   Keywords : chrome spinel; fossil meteorites; Komstad Limestone; winonaites; Middle Ordovician; carbonate sedimentology; Earth and Environmental Sciences;

   Abstract : I mellersta ordovicium var inflödet av kosmiskt material till jorden högre än idag, i sviter-na efter uppbrytningen av den L-kondritiska asteroidkroppen i asteroidbältet mellan Mars och Jupiter, vilket beri-kade den forna havsbottnen med meteoriter och kosmiskt damm. Komstadformationen i Killeröd, Skåne, innehåller ett lager särskilt rikt på L-kondritiska kromitkorn vilket indikerar en hög grad av kondensation. READ MORE

3. 2. Cosmic ray tracks in chondritic material with focus on silicate mineral inclusions in chromite

   University essay from Lunds universitet/Geologiska institutionen

   Author : My Riebe; [2012]
   Keywords : extraterrestrial chromite; cosmic rays; cosmic ray tracks; ordinary chondrites; Ordovician; kosmisk strålning; spår efter kosmisk strålning; extraterrestrisk kromit; ordinära kondriter; ordovicium; Earth and Environmental Sciences;

   Abstract : It has been suggested that the cosmic ray flux varies as Earth moves relative to the spiral arms in the galaxy. However, no satisfying record over the cosmic ray flux over long time scales has been presented. READ MORE

4. 3. Spinel group minerals in carbonaceous and ordinary chondrites

   University essay from Lunds universitet/Geologiska institutionen

   Author : My Riebe; [2009]
   Keywords : spinel group minerals; carbonaceous chondrites; ordinary chondrites; spinellgruppmineral; kolkondriter; ordinära kondriter; Earth and Environmental Sciences;

   Abstract : Meteorites are easily altered in the oxygen-rich environment on the Earth surface. Fossil meteorites are thus uncommon and in the ones, which are found, almost all minerals are secondary. However, the spinel group mineral chromite is resistant to alteration and has successfully been used as a proxy for ordinary chondrites in sediment. READ MORE

5. 4. Titanium- and chromium-rich opaque minerals in condensed sediments : chondritic, lunar and terrestrial origins

   University essay from Lunds universitet/Geologiska institutionen

   Author : Sanna Holm; [2008]
   Keywords : Ilmenite; chrome spinel; 3He; lunar impact ejecta; source rock; Middle Ordovician; Late Eocene; ilmenit; kromspinell; impakt ejekta; källbergart; mellanordovicium; sen eocen; Earth and Environmental Sciences;

   Abstract : Evidence from terrestrial sedimentary successions indicate that the amount of extraterrestrial material reaching Earth is not constant, but has been increased during parts of the Phanerozoic. An increase in the flux of extraterrestrial material to Earth has been proposed for the Middle Ordovician and the Late Eocene. READ MORE

6. 5. Classification of stony meteorites from north-west Africa and the Dhofar desert region in Oman

   University essay from Lunds universitet/Geologiska institutionen

   Author : Erika Ohlsson; [2007]
   Keywords : chondrites; Dhofar NWA; chondrules; petrographic type; shock stage; weathering grade; kondriter; kondruler; petrografisk typ; chocknivå; vittringsgrad; Earth and Environmental Sciences;

   Abstract : Populärvetenskaplig sammanfatttning: Meteoriter är fragment av asteroider ibland även av planeter i vårt solsystem. Det finns tre huvudklasser av meteoriter, järn-, stenjärn– och stenmeteoriter. Stenmeteoriterna är indelade i två underklasser, primitiva akondriter och kondriter . READ MORE