Record of fluid flow history through fractured conglomerates, Lower Old Red Sandstone of central Scotland

M Baron, J Parnell

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Extensively fractured quartzite clasts in Lower Old Red Sandstone conglomerates adjacent to the Highland Boundary Fault Zone in central Scotland contain multiple populations of healed microfractures delimited by fluid inclusion planes. Microthermometric analysis indicates that the healing of microfractures oriented perpendicular to the trend of the Highland Boundary Fault Zone, which probably formed during Acadian overthrusting towards the SE along the fault zone in Middle Devonian times, involved moderate temperature (T-h 102 to 238 degrees C), low to moderate salinity (3 to 17 wt% NaCl eq.) aqueous fluids. The clasts also contain a second set of fluid inclusion planes oriented parallel to the Highland Boundary Fault Zone, which formed during extension associated with the intrusion of late Carboniferous quartz dolerite dykes. The healing of this set of microfractures involved low temperature (T-h 58 to 155 degrees C), low to moderate salinity (1 to 12 wt% NaCl eq.) aqueous fluids.

Original languageEnglish
Pages (from-to)145-157
Number of pages13
JournalScottish Journal of Geology
Volume40
Publication statusPublished - 2004

Keywords

  • HIGHLAND BORDER COMPLEX
  • CAMBRIAN LENY LIMESTONE
  • REGIONAL STRESS-FIELD
  • INCLUSION PLANES
  • DALRADIAN SUPERGROUP
  • BOUNDARY FAULT
  • NORTHERN-IRELAND
  • EXOTIC STATUS
  • GOLD DEPOSIT
  • QUARTZ VEIN

Cite this

Record of fluid flow history through fractured conglomerates, Lower Old Red Sandstone of central Scotland. / Baron, M ; Parnell, J .

In: Scottish Journal of Geology, Vol. 40, 2004, p. 145-157.

Research output: Contribution to journalArticle

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abstract = "Extensively fractured quartzite clasts in Lower Old Red Sandstone conglomerates adjacent to the Highland Boundary Fault Zone in central Scotland contain multiple populations of healed microfractures delimited by fluid inclusion planes. Microthermometric analysis indicates that the healing of microfractures oriented perpendicular to the trend of the Highland Boundary Fault Zone, which probably formed during Acadian overthrusting towards the SE along the fault zone in Middle Devonian times, involved moderate temperature (T-h 102 to 238 degrees C), low to moderate salinity (3 to 17 wt{\%} NaCl eq.) aqueous fluids. The clasts also contain a second set of fluid inclusion planes oriented parallel to the Highland Boundary Fault Zone, which formed during extension associated with the intrusion of late Carboniferous quartz dolerite dykes. The healing of this set of microfractures involved low temperature (T-h 58 to 155 degrees C), low to moderate salinity (1 to 12 wt{\%} NaCl eq.) aqueous fluids.",
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AB - Extensively fractured quartzite clasts in Lower Old Red Sandstone conglomerates adjacent to the Highland Boundary Fault Zone in central Scotland contain multiple populations of healed microfractures delimited by fluid inclusion planes. Microthermometric analysis indicates that the healing of microfractures oriented perpendicular to the trend of the Highland Boundary Fault Zone, which probably formed during Acadian overthrusting towards the SE along the fault zone in Middle Devonian times, involved moderate temperature (T-h 102 to 238 degrees C), low to moderate salinity (3 to 17 wt% NaCl eq.) aqueous fluids. The clasts also contain a second set of fluid inclusion planes oriented parallel to the Highland Boundary Fault Zone, which formed during extension associated with the intrusion of late Carboniferous quartz dolerite dykes. The healing of this set of microfractures involved low temperature (T-h 58 to 155 degrees C), low to moderate salinity (1 to 12 wt% NaCl eq.) aqueous fluids.

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KW - DALRADIAN SUPERGROUP

KW - BOUNDARY FAULT

KW - NORTHERN-IRELAND

KW - EXOTIC STATUS

KW - GOLD DEPOSIT

KW - QUARTZ VEIN

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JO - Scottish Journal of Geology

JF - Scottish Journal of Geology

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