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REE i svekofenniska migmatitneosomer och sensvekofenniska graniter från Nyköpingsområdet

Mathiasson, Lena (1989) In Examensarbeten i geologi vid Lunds universitet
Department of Geology
Abstract (Swedish)
Sammanfattning: Examensarbetet ingår som det sista momentet på geovetarlinjens fjärde år vid Lunds universitet. Det har utförts vid Studsvik Energiteknik AB inom affärsområdet Säkerhetoch systemanalys vid NPE-gruppen.
Studsvik är beläget ca 25 km nordost om Nyköping och ca 90 km söder om Stockholm.
Examensarbetet har utgjort en del av ett forsknings- och utvecklingsprojekt, kallat "Recipient evolution project", som utförs inom NPE-gruppen. Detta projekt innefattar både fält- och laboratoriestudier, och behandlar fördelningen av olika element och radionuklider i sediment från sjöarna Sibbo- och Trobbofjärden samt deras dräneringsområden. Sjöarna har tidigare utgjort delar av östersjön, och sediment från dräneringsområdena representerar f... (More)
Sammanfattning: Examensarbetet ingår som det sista momentet på geovetarlinjens fjärde år vid Lunds universitet. Det har utförts vid Studsvik Energiteknik AB inom affärsområdet Säkerhetoch systemanalys vid NPE-gruppen.
Studsvik är beläget ca 25 km nordost om Nyköping och ca 90 km söder om Stockholm.
Examensarbetet har utgjort en del av ett forsknings- och utvecklingsprojekt, kallat "Recipient evolution project", som utförs inom NPE-gruppen. Detta projekt innefattar både fält- och laboratoriestudier, och behandlar fördelningen av olika element och radionuklider i sediment från sjöarna Sibbo- och Trobbofjärden samt deras dräneringsområden. Sjöarna har tidigare utgjort delar av östersjön, och sediment från dräneringsområdena representerar f d havsbotten.
Examensarbetet har utgjorts av en berggrundsstudie av de i huvudsak granitiska bergarterna inom samma område. Den främsta uppgiften har varit att studera de sällsynta jordartsmetallerna (Rare Earth Elements; REE).
Efter kartering och provtagning analyserades bergartsproverna med neutronaktiveringsanalys (NAA), vilken sker i Studsviks forskningsreaktor, varefter analysresultatet tolkades samt en studie av de sällsynta jordartsmetallerna gjordes.
Syftet med denna geokemiska bergartsundersökning är att söka ett ev samband mellan anrikade element i sedimenten och anrikade element i bergarterna. (Less)
Abstract
The research paper presented here completes the undergraduate geological studies at the University of Lund, Sweden. The work was performed at Studsvik Energiteknik AB (at the Studsvik Nuclear division, the NPE-group), at Studsvik 25 km northeast of the town of Nyköping and about 90 km south of Stockholm.
The work forms part of a research and development project called "the Recipient evolution project", that is performed by the NPE-group. It involves both field work and laboratory studies. The area investigated includes the lakes Sibbo- and Trobbofjärden. These lakes were former part of the Baltic Sea. They are studied to determnine the distribution of various elements and radionuclides of sea sediments (nowadays represented by the... (More)
The research paper presented here completes the undergraduate geological studies at the University of Lund, Sweden. The work was performed at Studsvik Energiteknik AB (at the Studsvik Nuclear division, the NPE-group), at Studsvik 25 km northeast of the town of Nyköping and about 90 km south of Stockholm.
The work forms part of a research and development project called "the Recipient evolution project", that is performed by the NPE-group. It involves both field work and laboratory studies. The area investigated includes the lakes Sibbo- and Trobbofjärden. These lakes were former part of the Baltic Sea. They are studied to determnine the distribution of various elements and radionuclides of sea sediments (nowadays represented by the drainage system of the lakes) as well as of recent sediments.
The work reported here mainly concerns the granitic bedrock within the area. The main task has been to study the REE distribution (Rare Earth Elements).
The rocks have been mapped and sampled. The samples were analysed with the instrumental neutron activation analysis method (INAA) at Studsvik.
The rocks in the area were formed and repeatedly deformed during the Svecofennian orogeny (1800-2000 million years ago). The rocks were migmatized and folded during these deformational and metamorphic episodes.
All samples have low chondrite normalized REE values (0.1-500) and chondrit normalized patterns with weak, negative slopes. Eu and Yb usually show small to moderate negative anomalies.
The various types of rocks (granitic or non-granitic; early Svecofennian or late Svecofennian) have similar patterns of chondrite normalized REE distribution, but samples from two sites (ST 2 and EV 2, repesenting a dolerite and a marble respectively) do not show the usual enrichment in LREE. The chondrite normalized pattern from site IN l (monzogranite) seems to be completely different from the other ones, probably because IN l represents a strongly migmatized rock. Conclusions are uncertain since the absolute values for many of the REE:s in this sample are below or very near the detection limit. (Less)
Please use this url to cite or link to this publication:
author
Mathiasson, Lena
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
geografi, geologi, REE, svekofennisk migmatitneosom, sensvekofennisk granit, Nyköping
publication/series
Examensarbeten i geologi vid Lunds universitet
report number
31
language
Swedish
additional info
Björn Sundblad, Studsvik Energiteknik AB.
id
2370741
date added to LUP
2012-06-04 14:23:19
date last changed
2012-06-18 11:25:26
@misc{2370741,
  abstract     = {The research paper presented here completes the undergraduate geological studies at the University of Lund, Sweden. The work was performed at Studsvik Energiteknik AB (at the Studsvik Nuclear division, the NPE-group), at Studsvik 25 km northeast of the town of Nyköping and about 90 km south of Stockholm.
The work forms part of a research and development project called "the Recipient evolution project", that is performed by the NPE-group. It involves both field work and laboratory studies. The area investigated includes the lakes Sibbo- and Trobbofjärden. These lakes were former part of the Baltic Sea. They are studied to determnine the distribution of various elements and radionuclides of sea sediments (nowadays represented by the drainage system of the lakes) as well as of recent sediments.
The work reported here mainly concerns the granitic bedrock within the area. The main task has been to study the REE distribution (Rare Earth Elements).
The rocks have been mapped and sampled. The samples were analysed with the instrumental neutron activation analysis method (INAA) at Studsvik.
The rocks in the area were formed and repeatedly deformed during the Svecofennian orogeny (1800-2000 million years ago). The rocks were migmatized and folded during these deformational and metamorphic episodes.
All samples have low chondrite normalized REE values (0.1-500) and chondrit normalized patterns with weak, negative slopes. Eu and Yb usually show small to moderate negative anomalies.
The various types of rocks (granitic or non-granitic; early Svecofennian or late Svecofennian) have similar patterns of chondrite normalized REE distribution, but samples from two sites (ST 2 and EV 2, repesenting a dolerite and a marble respectively) do not show the usual enrichment in LREE. The chondrite normalized pattern from site IN l (monzogranite) seems to be completely different from the other ones, probably because IN l represents a strongly migmatized rock. Conclusions are uncertain since the absolute values for many of the REE:s in this sample are below or very near the detection limit.},
  author       = {Mathiasson, Lena},
  keyword      = {geografi,geologi,REE,svekofennisk migmatitneosom,sensvekofennisk granit,Nyköping},
  language     = {swe},
  note         = {Student Paper},
  series       = {Examensarbeten i geologi vid Lunds universitet},
  title        = {REE i svekofenniska migmatitneosomer och sensvekofenniska graniter från Nyköpingsområdet},
  year         = {1989},
}