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The Neoproterozoic Visingsö Group of southern Sweden : lithology, sequence stratigraphy and provenance of the Middle Formation

Ahrenstedt, Viktor LU (2018) In Dissertations in Geology at Lund University GEOR02 20181
Department of Geology
Abstract
The depositional setting of the Neoproterozoic Visingsö Group has long been a subject of discussion. This study aims to provide additional insights into the lithological composition and provenance of the sediments and to provide a sequence stratigraphic framework in order to define the depositional setting. It focuses on rocks belonging to the Middle Formation of the Visingsö Group located at the Näs locality, Visingsö, Sweden. The meth-ods employed included descriptions of lithology, stratigraphic variations and identification of sedimentary patterns through detailed facies logs. Furthermore LA-ICP-MS analyses of U/Pb ages on detrital zircons were performed to determine their provenance. The sediments are characterized by an immature... (More)
The depositional setting of the Neoproterozoic Visingsö Group has long been a subject of discussion. This study aims to provide additional insights into the lithological composition and provenance of the sediments and to provide a sequence stratigraphic framework in order to define the depositional setting. It focuses on rocks belonging to the Middle Formation of the Visingsö Group located at the Näs locality, Visingsö, Sweden. The meth-ods employed included descriptions of lithology, stratigraphic variations and identification of sedimentary patterns through detailed facies logs. Furthermore LA-ICP-MS analyses of U/Pb ages on detrital zircons were performed to determine their provenance. The sediments are characterized by an immature composition, short transport distance and wave-dominated deposition. The sedimentary cycles are composed of coarsening-upwards intervals terminated by short transgressive episodes. Identified detrital ages of zircons are largely composed of ages that can be found in the region. The sequence stratigraphic framework is in accord with existing rift-basin models and showed that dep-osition was controlled by tectonic activity that created the space necessary for the deposition of sediments. This newly created space was filled in large parts by locally derived material with a smaller, more far-travelled, compo-nent. (Less)
Abstract (Swedish)
Det har länge pågått diskussioner om hur Visingsögruppen blev avsatt. Målet med den här studien
är att få mer insikt i sedimentens litologiska sammansättning, provenans och genom att sätta upp ett sekvensstratigrafiskt
ramverk kunna definiera depositionsprocesser. Studien fokuserade på sediment som tillhör den Mellersta
formationen i Visingsögruppen, belägna vid Näs, Visingsö, Sverige. Metoderna som används inkluderar beskrivningar
av litologi, stratigrafiska variationer och identifiering av sedimentära mönster genom detaljerade loggar.
Vidare så användes LA-ICP-MS analyser för U/Pb dateringar av detritala zirkoner för att bestämma deras provenans.
Sedimenten defineras av en omogen sammansättning, korta transportsträckor och... (More)
Det har länge pågått diskussioner om hur Visingsögruppen blev avsatt. Målet med den här studien
är att få mer insikt i sedimentens litologiska sammansättning, provenans och genom att sätta upp ett sekvensstratigrafiskt
ramverk kunna definiera depositionsprocesser. Studien fokuserade på sediment som tillhör den Mellersta
formationen i Visingsögruppen, belägna vid Näs, Visingsö, Sverige. Metoderna som används inkluderar beskrivningar
av litologi, stratigrafiska variationer och identifiering av sedimentära mönster genom detaljerade loggar.
Vidare så användes LA-ICP-MS analyser för U/Pb dateringar av detritala zirkoner för att bestämma deras provenans.
Sedimenten defineras av en omogen sammansättning, korta transportsträckor och vågdominerad avsättning.
De sedimentära cyklerna är sammansatta av intervall med kontinuerligt ökande kornstorlek som avslutas med transgressiva
episoder. De detritala zirkonernas åldrar stämmer i hög grad med åldrar som kan hittas regionalt. Det sekvensstratigrafiska
ramverket överensstämmer med existerande modeller för riftbassänger och visar att avsättningen
är kontrollerad av tektonik som skapar det nödvändiga utrymmet för att deposition ska kunna ske. Detta nyskapade
utrymme fylldes igen av lokalt material och en mindre komponent av längre transporterat material. (Less)
Please use this url to cite or link to this publication:
author
Ahrenstedt, Viktor LU
supervisor
organization
course
GEOR02 20181
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Neoproterozoic, Visingsö Group, sequence stratigraphy, provenance, lithology
publication/series
Dissertations in Geology at Lund University
report number
551
language
English
id
8962120
date added to LUP
2018-10-20 13:06:15
date last changed
2018-10-20 13:06:15
@misc{8962120,
  abstract     = {{The depositional setting of the Neoproterozoic Visingsö Group has long been a subject of discussion. This study aims to provide additional insights into the lithological composition and provenance of the sediments and to provide a sequence stratigraphic framework in order to define the depositional setting. It focuses on rocks belonging to the Middle Formation of the Visingsö Group located at the Näs locality, Visingsö, Sweden. The meth-ods employed included descriptions of lithology, stratigraphic variations and identification of sedimentary patterns through detailed facies logs. Furthermore LA-ICP-MS analyses of U/Pb ages on detrital zircons were performed to determine their provenance. The sediments are characterized by an immature composition, short transport distance and wave-dominated deposition. The sedimentary cycles are composed of coarsening-upwards intervals terminated by short transgressive episodes. Identified detrital ages of zircons are largely composed of ages that can be found in the region. The sequence stratigraphic framework is in accord with existing rift-basin models and showed that dep-osition was controlled by tectonic activity that created the space necessary for the deposition of sediments. This newly created space was filled in large parts by locally derived material with a smaller, more far-travelled, compo-nent.}},
  author       = {{Ahrenstedt, Viktor}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{Dissertations in Geology at Lund University}},
  title        = {{The Neoproterozoic Visingsö Group of southern Sweden : lithology, sequence stratigraphy and provenance of the Middle Formation}},
  year         = {{2018}},
}