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Contact metamorphism of Palaeozoic shale in southern Sweden: influences on clay mineralogy and implications for railway construction material properties

Olsson, Ingela LU and Ahlberg, Anders LU (2003) In GFF 125(2). p.63-68
Abstract
Abundant shale fragments were observed in dolerite material used for railway construction in western Skane, due to quarrying of Permo-Carboniferous dolerite in contact with Silurian shale (the Colonus Shale) in the Ronnarp Quarry, western Skane. Shale fragments were particularly enriched in the finest fractions of the crushed rock material. We analysed the clay mineralogy of shale from the railway material and at different distances from the dolerite in the quarry, in order to better understand the properties of the delivered rock material. The illite and chlorite dominated Colonus Shale in Skane typically shows background illite crystallinity in the uppermost diagenetic realm. In the Ronnarp Quarry, fissile shale a few meters away from... (More)
Abundant shale fragments were observed in dolerite material used for railway construction in western Skane, due to quarrying of Permo-Carboniferous dolerite in contact with Silurian shale (the Colonus Shale) in the Ronnarp Quarry, western Skane. Shale fragments were particularly enriched in the finest fractions of the crushed rock material. We analysed the clay mineralogy of shale from the railway material and at different distances from the dolerite in the quarry, in order to better understand the properties of the delivered rock material. The illite and chlorite dominated Colonus Shale in Skane typically shows background illite crystallinity in the uppermost diagenetic realm. In the Ronnarp Quarry, fissile shale a few meters away from the dolerite intrusion shows illite crystallinity in the anchimetamorphic stage. In massive shale less than I m from the shale-dolerite contact, swelling clay minerals have formed at the expense of illite. Therefore, despite the massive appearance of the contact metamorphosed shale, it is suggested that such rocks should be avoided during construction material production. A tentative model for post-intrusion hydrothermal clay mineral transformation is suggested. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
clay minerals, contact metamorphism, dolerite, Colonus Shale
in
GFF
volume
125
issue
2
pages
63 - 68
publisher
Geological Society of Sweden
external identifiers
  • wos:000184805100003
  • scopus:3843093025
ISSN
2000-0863
DOI
10.1080/11035890301252063
language
English
LU publication?
yes
id
13d65280-f896-4fed-aca3-e75e9a170e76 (old id 303534)
date added to LUP
2007-09-20 07:40:40
date last changed
2017-01-01 04:58:48
@article{13d65280-f896-4fed-aca3-e75e9a170e76,
  abstract     = {Abundant shale fragments were observed in dolerite material used for railway construction in western Skane, due to quarrying of Permo-Carboniferous dolerite in contact with Silurian shale (the Colonus Shale) in the Ronnarp Quarry, western Skane. Shale fragments were particularly enriched in the finest fractions of the crushed rock material. We analysed the clay mineralogy of shale from the railway material and at different distances from the dolerite in the quarry, in order to better understand the properties of the delivered rock material. The illite and chlorite dominated Colonus Shale in Skane typically shows background illite crystallinity in the uppermost diagenetic realm. In the Ronnarp Quarry, fissile shale a few meters away from the dolerite intrusion shows illite crystallinity in the anchimetamorphic stage. In massive shale less than I m from the shale-dolerite contact, swelling clay minerals have formed at the expense of illite. Therefore, despite the massive appearance of the contact metamorphosed shale, it is suggested that such rocks should be avoided during construction material production. A tentative model for post-intrusion hydrothermal clay mineral transformation is suggested.},
  author       = {Olsson, Ingela and Ahlberg, Anders},
  issn         = {2000-0863},
  keyword      = {clay minerals,contact metamorphism,dolerite,Colonus Shale},
  language     = {eng},
  number       = {2},
  pages        = {63--68},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {Contact metamorphism of Palaeozoic shale in southern Sweden: influences on clay mineralogy and implications for railway construction material properties},
  url          = {http://dx.doi.org/10.1080/11035890301252063},
  volume       = {125},
  year         = {2003},
}