Essays about: "pyroxene"

Showing result 11 - 15 of 15 essays containing the word pyroxene.

1. 11. 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

3. 12. 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

4. 13. A geochemical study of the zoned Pan-African Mon Repos intrusion, central Namibia

   University essay from Lunds universitet/Geologiska institutionen

   Author : Jon Warnhag; [2001]
   Keywords : geography; geology; geochemistry; Pan-African Mon Repos intrusion; Namibia; Earth and Environmental Sciences;

   Abstract : The Mon Repos covers an area of approximately 10 x 4 km. It consists of a zoned intrusion, where the peripheral parts are monzodioritic and the central areas granitic. Mon Repos is situated in central Namibia approximately 150 km northwest of Windhoek. READ MORE

5. 14. Sveconorwegian influence on the ca. 1.36 Ga old Tjärnesjö granite, and associated pyroxene bearing quartz-monzonites in southwestern Sweden

   University essay from Lunds universitet/Geologiska institutionen

   Author : Jenny Andersson; [1996]
   Keywords : Sveconorwegian influence; ca 1.36 Ga; geology; geography; Tjärnesjö granite; pyroxene; quartz-monzonites; southwestern Sweden; Earth and Environmental Sciences;

   Abstract : The granite massif in the Tjärnesjö area, southwestern Sweden, was deformed and metamorphosed under granulite facies conditions in late Sveconorwegian time. The intrusive is dominated by a coarse-grained, megacrystic orthoclase granite. Pb-Pb evaporation datings on single zircons from the granite yield an age of ca. 1. READ MORE

6. 15. Investigation of a wollastonite occurence in central Sweden

   University essay from Lunds universitet/Geologiska institutionen

   Author : Anett Elg; [1987]
   Keywords : geography; geology; wollastonite; central Sweden; Earth and Environmental Sciences;

   Abstract : The wollastonite occurrence at Hulta is a skarn deposit associated with iron ore within the Leptite Formation of central Sweden. Wollastonite is found in carbonate layers within the leptite and the rocks have been subject to regional metamorphism. These layers are normally approximately 10 cm thick. READ MORE