Skip to main content

LUP Student Papers

LUND UNIVERSITY LIBRARIES

A reconnassaince study of Rävliden VHMS-deposit, northern Sweden

Sidenmark, Jessica LU (2013) In Dissertations in Geology at Lund University GEOL01 20131
Department of Geology
Abstract
In the Skellefte district today there are about 85 known VHMS-deposits, in the Kristinebergs area there are five known deposits, one of them being Rävliden. The supracrustal rock primarily consists of metavolcanic rock of rhyolitic composition and also metasedimentary volcanic rock. The district has gone through at least two metamorphic events. This resulted in the presence of large scale folding. Rävliden lies next to an antiform (compression N-S) that plunges to the west. In this study five drill cores from the Rävliden mine were logged. Six main lithologies were found; rhyolite, sandstone, graphite schist, sericite quartzite, tremolite skarn and carbonate rock. The logging of the five drill cores resulted in two profiles. The result is... (More)
In the Skellefte district today there are about 85 known VHMS-deposits, in the Kristinebergs area there are five known deposits, one of them being Rävliden. The supracrustal rock primarily consists of metavolcanic rock of rhyolitic composition and also metasedimentary volcanic rock. The district has gone through at least two metamorphic events. This resulted in the presence of large scale folding. Rävliden lies next to an antiform (compression N-S) that plunges to the west. In this study five drill cores from the Rävliden mine were logged. Six main lithologies were found; rhyolite, sandstone, graphite schist, sericite quartzite, tremolite skarn and carbonate rock. The logging of the five drill cores resulted in two profiles. The result is an interpretation of the geology, matching core with similar properties. In the sandstone there are areas locally rich in graphite which probably derives from sediment on the seafloor, the graphite schist is also probably seafloor-sediment. Alteration in the rock is extensive making it hard to see primary structures. The application of alteration index implies that the area is hydrothermally altered. This information and the findings of graphite imply that the area of study is in a transition zone between the footwall and hanging wall. It is also probable that the area is in a limb of an antiform when looking at the profiles. (Less)
Abstract (Swedish)
I Skelleftefältet finns idag runt 85 kända VHMS-fyndigheter, i Kristinebergsområdet finns fem av dessa fyndigheter, en av dem är Rävliden. Berggrunden består mestadels av meta-vulkaniter med ryolitisk komposition samt en meta-sedimentär vulkanisk bergart. Skelleftefältet har genomgått åtminstone två metamorfa event. Detta har resulterat i storskalig veckning av området. Fyndigheten i Rävliden ligger i närheten av en antiform (kompression N-S) där veckaxeln stupar till väster. Fem borrhål från Rävliden har karterats för denna studie. Resul-
tatet av karteringen blev en framställning av två profiler. I dessa profiler beskrivs sex huvudsakliga litologier; ryolit, sandsten, grafitskiffer, sericitkvartsit, tremolitskarn och karbonat bergart.... (More)
I Skelleftefältet finns idag runt 85 kända VHMS-fyndigheter, i Kristinebergsområdet finns fem av dessa fyndigheter, en av dem är Rävliden. Berggrunden består mestadels av meta-vulkaniter med ryolitisk komposition samt en meta-sedimentär vulkanisk bergart. Skelleftefältet har genomgått åtminstone två metamorfa event. Detta har resulterat i storskalig veckning av området. Fyndigheten i Rävliden ligger i närheten av en antiform (kompression N-S) där veckaxeln stupar till väster. Fem borrhål från Rävliden har karterats för denna studie. Resul-
tatet av karteringen blev en framställning av två profiler. I dessa profiler beskrivs sex huvudsakliga litologier; ryolit, sandsten, grafitskiffer, sericitkvartsit, tremolitskarn och karbonat bergart. Resultatet är en tolkning av geologin där borrkärna med liknande egenskaper matchas. I sandstenen finns det grafitrika områden som förmodligen kommer från sediment på havsbotten, samma sak gäller med grafiten i grafitskiffern. Omvandlingen i borrkärnorna är hög, detta gör det svårt att se primära strukturer i kärnorna. Tillämpandet av omvandlingsindex tyder på att området är hydrotermalt omvandlat. Denna information och fynden av grafit tyder på att området som är undersökt i
studien är i en övergångszon mellan liggvägg och hängvägg. Det är troligt att det karterade området utgör en del av en antiforms veckben när profilerna tolkas. (Less)
Please use this url to cite or link to this publication:
author
Sidenmark, Jessica LU
supervisor
organization
alternative title
En rekognoserande studie av Rävliden’s VHMS - fyndighet, norra Sverige
course
GEOL01 20131
year
type
M2 - Bachelor Degree
subject
keywords
Skellefte district, alteration, VHMS, bedrock geology, Skelleftefältet, Rävliden
publication/series
Dissertations in Geology at Lund University
report number
342
language
English
additional info
External supervisors: Mac Fjellerad Persson and Dr. Nils Jansson, Boliden Mineral AB
id
3909860
date added to LUP
2013-06-26 12:06:31
date last changed
2013-06-26 12:06:31
@misc{3909860,
  abstract     = {In the Skellefte district today there are about 85 known VHMS-deposits, in the Kristinebergs area there are five known deposits, one of them being Rävliden. The supracrustal rock primarily consists of metavolcanic rock of rhyolitic composition and also metasedimentary volcanic rock. The district has gone through at least two metamorphic events. This resulted in the presence of large scale folding. Rävliden lies next to an antiform (compression N-S) that plunges to the west. In this study five drill cores from the Rävliden mine were logged. Six main lithologies were found; rhyolite, sandstone, graphite schist, sericite quartzite, tremolite skarn and carbonate rock. The logging of the five drill cores resulted in two profiles. The result is an interpretation of the geology, matching core with similar properties. In the sandstone there are areas locally rich in graphite which probably derives from sediment on the seafloor, the graphite schist is also probably seafloor-sediment. Alteration in the rock is extensive making it hard to see primary structures. The application of alteration index implies that the area is hydrothermally altered. This information and the findings of graphite imply that the area of study is in a transition zone between the footwall and hanging wall. It is also probable that the area is in a limb of an antiform when looking at the profiles.},
  author       = {Sidenmark, Jessica},
  keyword      = {Skellefte district,alteration,VHMS,bedrock geology,Skelleftefältet,Rävliden},
  language     = {eng},
  note         = {Student Paper},
  series       = {Dissertations in Geology at Lund University},
  title        = {A reconnassaince study of Rävliden VHMS-deposit, northern Sweden},
  year         = {2013},
}