Mesosideriter — redogörelse av bildningsprocesser samt SEM-analys av Vaca Muertameteoriten
(2018) In Examensarbeten i geologi vid Lunds universitet GEOL01 20181Department of Geology
- Abstract (Swedish)
- I över hundra år har mesosideriterna förbryllat forskare, och många teorier har kommit och gått. Huvudfrågorna har varit: Hur blandades kärn- och skorpmaterial utan att inkorporera stora mängder mantelmaterial? Vilket scenario förklarar en snabb avkylning, följt av en extremt långsam avkylning? I detta examensarbete samlar jag forskningen kring mesosideriterna och diskuterar de olika teorierna. En stuff från Vaca Muerta analyserades också med hjälp av svepelektronmikroskop (SEM). Teknikerna backscattered electron imaging (BSE) och energy dispersive spectrography (EDS) användes för att identifiera mineral och kemisk sammansättning, samt texturer. Ett flertal områden valdes ut och studerades i närmare detalj. Bland annat en gabbrolik klast,... (More)
- I över hundra år har mesosideriterna förbryllat forskare, och många teorier har kommit och gått. Huvudfrågorna har varit: Hur blandades kärn- och skorpmaterial utan att inkorporera stora mängder mantelmaterial? Vilket scenario förklarar en snabb avkylning, följt av en extremt långsam avkylning? I detta examensarbete samlar jag forskningen kring mesosideriterna och diskuterar de olika teorierna. En stuff från Vaca Muerta analyserades också med hjälp av svepelektronmikroskop (SEM). Teknikerna backscattered electron imaging (BSE) och energy dispersive spectrography (EDS) användes för att identifiera mineral och kemisk sammansättning, samt texturer. Ett flertal områden valdes ut och studerades i närmare detalj. Bland annat en gabbrolik klast, reaktionskoronor runt olivin, och vad som tolkades vara smälttexturer. Dessa diskuterades utifrån existerande publikationer om samma fenomen i mesosideriter. Ett antal texturer visade sig vara dåligt dokumenterade, andra saknade tidigare observationer hos mesosideriter. (Less)
- Abstract
- The mesosiderites have puzzled researchers for over a hundred years, and many theories have come and gone. The main bones of contention have been: How did core and crust material mix without incorporating large amounts of mantle material? What kind of scenario explains a period of fast cooling, followed by extremely slow cooling? This work gathers and discusses the research on mesosiderites. A hand sample from Vaca Muerta was also analysed with a sweeping electron microscope (SEM), where the techniques of backscattered electron imaging (BSE) and energy dispersive spectrography (EDS) was used to identify minerals and chemical compositions, as well as textures. Several areas were chosen for closer study, among them, a gabbroic clast,... (More)
- The mesosiderites have puzzled researchers for over a hundred years, and many theories have come and gone. The main bones of contention have been: How did core and crust material mix without incorporating large amounts of mantle material? What kind of scenario explains a period of fast cooling, followed by extremely slow cooling? This work gathers and discusses the research on mesosiderites. A hand sample from Vaca Muerta was also analysed with a sweeping electron microscope (SEM), where the techniques of backscattered electron imaging (BSE) and energy dispersive spectrography (EDS) was used to identify minerals and chemical compositions, as well as textures. Several areas were chosen for closer study, among them, a gabbroic clast, reaction coronas around olivine, and what was interpreted as a melt texture. These were discussed in the context of previous works of the same phenomenons in mesosiderites. Some of these had previously been poorly documented, or lacked previous observations altogether. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8944917
- author
- Zachén, Gabriel LU
- supervisor
-
- Carl Alwmark LU
- Paula Lindgren LU
- organization
- course
- GEOL01 20181
- year
- 2018
- type
- M2 - Bachelor Degree
- subject
- keywords
- meteoriter, mesosideriter, järn-stenmeteoriter, Vaca Muerta, SEM, BSE, EDS
- publication/series
- Examensarbeten i geologi vid Lunds universitet
- report number
- 535
- language
- Swedish
- id
- 8944917
- date added to LUP
- 2018-06-05 11:53:23
- date last changed
- 2018-06-05 11:53:23
@misc{8944917,
abstract = {{The mesosiderites have puzzled researchers for over a hundred years, and many theories have come and gone. The main bones of contention have been: How did core and crust material mix without incorporating large amounts of mantle material? What kind of scenario explains a period of fast cooling, followed by extremely slow cooling? This work gathers and discusses the research on mesosiderites. A hand sample from Vaca Muerta was also analysed with a sweeping electron microscope (SEM), where the techniques of backscattered electron imaging (BSE) and energy dispersive spectrography (EDS) was used to identify minerals and chemical compositions, as well as textures. Several areas were chosen for closer study, among them, a gabbroic clast, reaction coronas around olivine, and what was interpreted as a melt texture. These were discussed in the context of previous works of the same phenomenons in mesosiderites. Some of these had previously been poorly documented, or lacked previous observations altogether.}},
author = {{Zachén, Gabriel}},
language = {{swe}},
note = {{Student Paper}},
series = {{Examensarbeten i geologi vid Lunds universitet}},
title = {{Mesosideriter — redogörelse av bildningsprocesser samt SEM-analys av Vaca Muertameteoriten}},
year = {{2018}},
}