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Geochronology and geochemical evidence for a magmatic arc setting for the Ni-Cu mineralised 1.79Ga Kleva gabbro-diorite intrusive complex, southeast Sweden

Bjärnborg, Karolina LU ; Scherstén, Anders LU ; Söderlund, Ulf LU and Maier, Wolfgang D. (2015) In GFF 137(2). p.83-101
Abstract
Magmatic Ni-Cu sulphide deposits are commonly associated with mafic rocks within the marginal areas of Archean or Proterozoic cratons. The Kleva Ni-Cu sulphide deposit in southeast Sweden is hosted by gabbro-diorite rocks and is sandwiched between two Palaeoproterozoic magmatic arcs: the Transscandinavian Igneous Belt (TIB) and the Oskarshamn-Jonkoping Belt (OJB). Major and trace element data corroborate an arc origin for the Kleva intrusive complex. The variety of rocks and geochemical signatures suggest that it formed from several magmatic pulses. Despite the occurrence of supracrustal xenoliths, there is a lack of trace element evidence for significant assimilation. Mafic intrusions are abundant in southeast Sweden and are generally... (More)
Magmatic Ni-Cu sulphide deposits are commonly associated with mafic rocks within the marginal areas of Archean or Proterozoic cratons. The Kleva Ni-Cu sulphide deposit in southeast Sweden is hosted by gabbro-diorite rocks and is sandwiched between two Palaeoproterozoic magmatic arcs: the Transscandinavian Igneous Belt (TIB) and the Oskarshamn-Jonkoping Belt (OJB). Major and trace element data corroborate an arc origin for the Kleva intrusive complex. The variety of rocks and geochemical signatures suggest that it formed from several magmatic pulses. Despite the occurrence of supracrustal xenoliths, there is a lack of trace element evidence for significant assimilation. Mafic intrusions are abundant in southeast Sweden and are generally inferred to be synchronous with the TIB. Of these, Kleva is the only known Ni-Cu deposit, and it is unclear if it is associated with the OJB or TIB. Here, we present zircon and baddeleyite U-Pb dates of 1788 +/- 4Ma, 1788 +/- 5Ma and 1792 +/- 3Ma. We interpret a 1790Ma date to be the best estimate of the crystallisation age of the Kleva intrusive complex, indicating that the emplacement of mafic magma is coeval with the voluminous arc-related TIB magmatism in the area. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ni-Cu deposit, Transscandinavian Igneous Belt, Palaeoproterozoic, arc, gabbro-diorite
in
GFF
volume
137
issue
2
pages
83 - 101
publisher
Geological Society of Sweden
external identifiers
  • wos:000355596200001
  • scopus:84930573545
ISSN
2000-0863
DOI
10.1080/11035897.2015.1015265
language
English
LU publication?
yes
id
5dfe7b00-5332-4829-8cad-a983b0d5907a (old id 7410985)
date added to LUP
2015-06-29 09:58:28
date last changed
2017-10-08 03:01:50
@article{5dfe7b00-5332-4829-8cad-a983b0d5907a,
  abstract     = {Magmatic Ni-Cu sulphide deposits are commonly associated with mafic rocks within the marginal areas of Archean or Proterozoic cratons. The Kleva Ni-Cu sulphide deposit in southeast Sweden is hosted by gabbro-diorite rocks and is sandwiched between two Palaeoproterozoic magmatic arcs: the Transscandinavian Igneous Belt (TIB) and the Oskarshamn-Jonkoping Belt (OJB). Major and trace element data corroborate an arc origin for the Kleva intrusive complex. The variety of rocks and geochemical signatures suggest that it formed from several magmatic pulses. Despite the occurrence of supracrustal xenoliths, there is a lack of trace element evidence for significant assimilation. Mafic intrusions are abundant in southeast Sweden and are generally inferred to be synchronous with the TIB. Of these, Kleva is the only known Ni-Cu deposit, and it is unclear if it is associated with the OJB or TIB. Here, we present zircon and baddeleyite U-Pb dates of 1788 +/- 4Ma, 1788 +/- 5Ma and 1792 +/- 3Ma. We interpret a 1790Ma date to be the best estimate of the crystallisation age of the Kleva intrusive complex, indicating that the emplacement of mafic magma is coeval with the voluminous arc-related TIB magmatism in the area.},
  author       = {Bjärnborg, Karolina and Scherstén, Anders and Söderlund, Ulf and Maier, Wolfgang D.},
  issn         = {2000-0863},
  keyword      = {Ni-Cu deposit,Transscandinavian Igneous Belt,Palaeoproterozoic,arc,gabbro-diorite},
  language     = {eng},
  number       = {2},
  pages        = {83--101},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {Geochronology and geochemical evidence for a magmatic arc setting for the Ni-Cu mineralised 1.79Ga Kleva gabbro-diorite intrusive complex, southeast Sweden},
  url          = {http://dx.doi.org/10.1080/11035897.2015.1015265},
  volume       = {137},
  year         = {2015},
}