Geofysisk och geologisk tolkning av kritskollors utbredning i Ystadsområdet
(2022) In Examensarbeten i geologi vid Lunds universitet GEOL01 20221Department of Geology
- Abstract (Swedish)
- Kritskollor, eller stora flak av kritbergarter, transporterades subglacialt med den senaste inlandsisen reträtt och hittas idag delvis blottlagda längs den skånska sydkusten. Utanför Malmö utvanns högren krita från dessa flak fram till slutet av 1900-talet och var en viktig exportvara. Idag importeras en stor del av de renare karbonatbergarterna från bland annat europeiska länder för olika industriändamål med krav på renhet. Likartade skollor bestående av danienkalksten, finns karterade i Ystadsområdet men har aldrig varit föremål för exploatering. Helikopterburna transient elektromagnetiska mätningar, mer känt som airborne transient electromagnetic method measurments (ATEM), utfördes mellan åren 2018–2020 i Skåne och Blekinge i syfte att... (More)
- Kritskollor, eller stora flak av kritbergarter, transporterades subglacialt med den senaste inlandsisen reträtt och hittas idag delvis blottlagda längs den skånska sydkusten. Utanför Malmö utvanns högren krita från dessa flak fram till slutet av 1900-talet och var en viktig exportvara. Idag importeras en stor del av de renare karbonatbergarterna från bland annat europeiska länder för olika industriändamål med krav på renhet. Likartade skollor bestående av danienkalksten, finns karterade i Ystadsområdet men har aldrig varit föremål för exploatering. Helikopterburna transient elektromagnetiska mätningar, mer känt som airborne transient electromagnetic method measurments (ATEM), utfördes mellan åren 2018–2020 i Skåne och Blekinge i syfte att kartera och lokalisering av grundvattenförekomster. ATEM-datan från dessa undersökningar har nyttjats med målsättningen att lokalisera och volymberäkna kritskollorna i Ystadsområdet. Med hjälp av mjukvaruprogrammet Geoscene 3D har mätdata tolkats. Tolkningarna har resulterat i en generell geologisk lagerföljd för projektområdet, samt identifieringen av områden vilka potentiellt kan innehålla kritkalksten. Totalt har 47 delområden markerats ut i projektområdet som intressanta för vidare undersökningar. Det föreslås att primärt fokus läggs på ett specifikt område norr om orten Snårestad där sannolikheten att hitta en kritskolla bedöms som störst. Detta arbete visar dock (också) att metoden ATEM inte är tillräcklig för att säkert bekräfta förekomsten av kritskollor. Därför rekommenderas att inledningsvis genomföra en detaljerad resistivitetsundersökning för bättre upplösning av lagerföljden. Därefter bör denna kompletteras med borrningar för att bekräfta eventuella förekomster av kritkalksten. Efter genomfört arbete dras slutsatsen att det inte enbart med metoden ATEM går att bekräfta kritskollors existens i projektområdet. (Less)
- Abstract
- Cretaceous chalk rafts were transported subglacially with the last ice sheet retreat and are today found partially exposed along the southern coast of Skåne. Outside Malmö, chalk was extracted from these rafts until the end of the 20th century, when it was an important export commodity. Today, a large portion of the purer carbonate rocks are imported from Europe and other countries for various industrial purposes. Similar chalk rafts, consisting of Danian limestone, are mapped in the Ystad area but have never been exploited. Airborne transient electromagnetic method measurements (ATEM), were carried out between the years 2018 and 2020 in Skåne and Blekinge with the aim of mapping and locating groundwater reservoirs. The ATEM data from... (More)
- Cretaceous chalk rafts were transported subglacially with the last ice sheet retreat and are today found partially exposed along the southern coast of Skåne. Outside Malmö, chalk was extracted from these rafts until the end of the 20th century, when it was an important export commodity. Today, a large portion of the purer carbonate rocks are imported from Europe and other countries for various industrial purposes. Similar chalk rafts, consisting of Danian limestone, are mapped in the Ystad area but have never been exploited. Airborne transient electromagnetic method measurements (ATEM), were carried out between the years 2018 and 2020 in Skåne and Blekinge with the aim of mapping and locating groundwater reservoirs. The ATEM data from these surveys has been used with the aim of locating and volume estimating the chalk rafts in the Ystad area. Using the Geoscene 3D software, the survey data have been interpreted and used to generate a general geological sequence for the project area as well as to identify of areas that may potentially contain Cretaceous limestone. A total of 47 sub-areas have been marked out in the area as being of interest for further investigation. It is proposed to focus primarily on a specific area north of the village of Snårestad where the probability of finding limestone is considered to be the highest. However, this study also concluds that it is not possible to confirm the existence of chalk rafts in the project area solely by using the ATEM method. It is therefore recommended to initially carry out a detailed resistivity survey for better resolution of the layer sequence. This should then be supplemented by drilling to confirm the possible presence of chalk rafts. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9085443
- author
- Svensson, David LU
- supervisor
- organization
- course
- GEOL01 20221
- year
- 2022
- type
- M2 - Bachelor Degree
- subject
- keywords
- Kritskollor, ATEM, Geofysik, GeoScene3D, Ystad, Skurup
- publication/series
- Examensarbeten i geologi vid Lunds universitet
- report number
- 631
- language
- Swedish
- additional info
- Extern handledare: Olof Taromi Sandström, Sveriges Geologiska Undersökning
- id
- 9085443
- date added to LUP
- 2022-06-08 15:36:15
- date last changed
- 2022-06-08 15:36:15
@misc{9085443,
abstract = {{Cretaceous chalk rafts were transported subglacially with the last ice sheet retreat and are today found partially exposed along the southern coast of Skåne. Outside Malmö, chalk was extracted from these rafts until the end of the 20th century, when it was an important export commodity. Today, a large portion of the purer carbonate rocks are imported from Europe and other countries for various industrial purposes. Similar chalk rafts, consisting of Danian limestone, are mapped in the Ystad area but have never been exploited. Airborne transient electromagnetic method measurements (ATEM), were carried out between the years 2018 and 2020 in Skåne and Blekinge with the aim of mapping and locating groundwater reservoirs. The ATEM data from these surveys has been used with the aim of locating and volume estimating the chalk rafts in the Ystad area. Using the Geoscene 3D software, the survey data have been interpreted and used to generate a general geological sequence for the project area as well as to identify of areas that may potentially contain Cretaceous limestone. A total of 47 sub-areas have been marked out in the area as being of interest for further investigation. It is proposed to focus primarily on a specific area north of the village of Snårestad where the probability of finding limestone is considered to be the highest. However, this study also concluds that it is not possible to confirm the existence of chalk rafts in the project area solely by using the ATEM method. It is therefore recommended to initially carry out a detailed resistivity survey for better resolution of the layer sequence. This should then be supplemented by drilling to confirm the possible presence of chalk rafts.}},
author = {{Svensson, David}},
language = {{swe}},
note = {{Student Paper}},
series = {{Examensarbeten i geologi vid Lunds universitet}},
title = {{Geofysisk och geologisk tolkning av kritskollors utbredning i Ystadsområdet}},
year = {{2022}},
}