Are spherulitic lacustrine carbonates an expression of large-scale mineral carbonation?

A case study from the East Kirkton Limestone, Scotland

Mike Rogerson, Ramon Mercedes-Martín, Alexander T Brasier, Rona A.R. McGill, Tim J. Prior, Hubert Vonhof, Simon M. Fellows, John J. G. Reijmer, Erin L. McClymont, Ian Billing, Anna Matthews, Martyn Pedley

Research output: Contribution to journalArticle

9 Citations (Scopus)
6 Downloads (Pure)

Abstract

Lacustrine carbonate deposits with spherulitic facies are poorly understood, but are key to understanding the economically important “Pre-Salt” Mesozoic strata of the South Atlantic. A major barrier to research into these unique and spectacular facies is the lack of good lacustrine spherulite-dominated deposits which are known in outcrop. Stratigraphy and petrography suggest one of the best analogue systems is found in the Carboniferous of Scotland: the East Kirkton Limestone. Here we propose a hydrogeochemical model that explains why the CaCO3, SiO2, Mg-Si-Al mineral suite associated with spherular radial calcite facies forms in alkaline lakes above basaltic bedrock. Demonstrating links between igneous bedrock chemistry, lake and spring water chemistry and mineral precipitation, this model has implications for studies of lacustrine sediments in rift basins of all ages. Using empirical and theoretical approaches, we analyze the relationship between metal mobilization from sub-surface volcaniclastic rocks and the potential for precipitation of carbonate minerals, various Mg-bearing minerals and chalcedony in a lacustrine spherulitic carbonate setting. This suite of minerals is most likely formed by in-gassing of CO2 to a carbon-limited alkaline spring water, consistent with the reaction of alkali igneous rocks in the subsurface with meteoric groundwater. We suggest that an analogous system to that at East Kirkton caused development of the ‘Pre-Salt’ spherulitic carbonate deposits.
Original languageEnglish
Pages (from-to)101-109
Number of pages9
JournalGondwana Research
Volume48
Early online date26 Apr 2017
DOIs
Publication statusPublished - Aug 2017

Fingerprint

limestone
carbonate
mineral
spring water
bedrock
spherulite
salt
alkaline water
chalcedony
petrography
water chemistry
igneous rock
lake water
mobilization
lacustrine deposit
outcrop
stratigraphy
calcite
groundwater
metal

Keywords

  • Palaeozoic
  • magnesium silicate
  • calcite
  • hydrolysis
  • Pre-Salt
  • palaeogeography
  • lake
  • PHREEQC
  • Europe
  • sediment mineralogy

Cite this

Are spherulitic lacustrine carbonates an expression of large-scale mineral carbonation? A case study from the East Kirkton Limestone, Scotland. / Rogerson, Mike ; Mercedes-Martín, Ramon ; Brasier, Alexander T; McGill, Rona A.R. ; Prior, Tim J.; Vonhof, Hubert ; Fellows, Simon M. ; Reijmer, John J. G. ; McClymont, Erin L.; Billing, Ian ; Matthews, Anna ; Pedley, Martyn .

In: Gondwana Research, Vol. 48, 08.2017, p. 101-109.

Research output: Contribution to journalArticle

Rogerson, M, Mercedes-Martín, R, Brasier, AT, McGill, RAR, Prior, TJ, Vonhof, H, Fellows, SM, Reijmer, JJG, McClymont, EL, Billing, I, Matthews, A & Pedley, M 2017, 'Are spherulitic lacustrine carbonates an expression of large-scale mineral carbonation? A case study from the East Kirkton Limestone, Scotland', Gondwana Research, vol. 48, pp. 101-109. https://doi.org/10.1016/j.gr.2017.04.007
Rogerson, Mike ; Mercedes-Martín, Ramon ; Brasier, Alexander T ; McGill, Rona A.R. ; Prior, Tim J. ; Vonhof, Hubert ; Fellows, Simon M. ; Reijmer, John J. G. ; McClymont, Erin L. ; Billing, Ian ; Matthews, Anna ; Pedley, Martyn . / Are spherulitic lacustrine carbonates an expression of large-scale mineral carbonation? A case study from the East Kirkton Limestone, Scotland. In: Gondwana Research. 2017 ; Vol. 48. pp. 101-109.
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title = "Are spherulitic lacustrine carbonates an expression of large-scale mineral carbonation?: A case study from the East Kirkton Limestone, Scotland",
abstract = "Lacustrine carbonate deposits with spherulitic facies are poorly understood, but are key to understanding the economically important “Pre-Salt” Mesozoic strata of the South Atlantic. A major barrier to research into these unique and spectacular facies is the lack of good lacustrine spherulite-dominated deposits which are known in outcrop. Stratigraphy and petrography suggest one of the best analogue systems is found in the Carboniferous of Scotland: the East Kirkton Limestone. Here we propose a hydrogeochemical model that explains why the CaCO3, SiO2, Mg-Si-Al mineral suite associated with spherular radial calcite facies forms in alkaline lakes above basaltic bedrock. Demonstrating links between igneous bedrock chemistry, lake and spring water chemistry and mineral precipitation, this model has implications for studies of lacustrine sediments in rift basins of all ages. Using empirical and theoretical approaches, we analyze the relationship between metal mobilization from sub-surface volcaniclastic rocks and the potential for precipitation of carbonate minerals, various Mg-bearing minerals and chalcedony in a lacustrine spherulitic carbonate setting. This suite of minerals is most likely formed by in-gassing of CO2 to a carbon-limited alkaline spring water, consistent with the reaction of alkali igneous rocks in the subsurface with meteoric groundwater. We suggest that an analogous system to that at East Kirkton caused development of the ‘Pre-Salt’ spherulitic carbonate deposits.",
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note = "BP Exploration Co. is thanked for funding, and particularly the Carbonate Team for supporting this research and for fruitful discussions. West Lothian Council and Scottish Natural Heritage are thanked for allowing access and permission for sampling the site. The Core Store Team at BGS Keyworth is particularly acknowledged for their assistance. Mark Anderson, Tony Sinclair (University of Hull), and Bouk Lacet (VU University Amsterdam) are thanked for technical support. Anne Kelly (SUERC) for carrying out the Strontium Isotope analyses. Mark Tyrer is thanked for his advice on PHREEQC modelling.",
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T2 - A case study from the East Kirkton Limestone, Scotland

AU - Rogerson, Mike

AU - Mercedes-Martín, Ramon

AU - Brasier, Alexander T

AU - McGill, Rona A.R.

AU - Prior, Tim J.

AU - Vonhof, Hubert

AU - Fellows, Simon M.

AU - Reijmer, John J. G.

AU - McClymont, Erin L.

AU - Billing, Ian

AU - Matthews, Anna

AU - Pedley, Martyn

N1 - BP Exploration Co. is thanked for funding, and particularly the Carbonate Team for supporting this research and for fruitful discussions. West Lothian Council and Scottish Natural Heritage are thanked for allowing access and permission for sampling the site. The Core Store Team at BGS Keyworth is particularly acknowledged for their assistance. Mark Anderson, Tony Sinclair (University of Hull), and Bouk Lacet (VU University Amsterdam) are thanked for technical support. Anne Kelly (SUERC) for carrying out the Strontium Isotope analyses. Mark Tyrer is thanked for his advice on PHREEQC modelling.

PY - 2017/8

Y1 - 2017/8

N2 - Lacustrine carbonate deposits with spherulitic facies are poorly understood, but are key to understanding the economically important “Pre-Salt” Mesozoic strata of the South Atlantic. A major barrier to research into these unique and spectacular facies is the lack of good lacustrine spherulite-dominated deposits which are known in outcrop. Stratigraphy and petrography suggest one of the best analogue systems is found in the Carboniferous of Scotland: the East Kirkton Limestone. Here we propose a hydrogeochemical model that explains why the CaCO3, SiO2, Mg-Si-Al mineral suite associated with spherular radial calcite facies forms in alkaline lakes above basaltic bedrock. Demonstrating links between igneous bedrock chemistry, lake and spring water chemistry and mineral precipitation, this model has implications for studies of lacustrine sediments in rift basins of all ages. Using empirical and theoretical approaches, we analyze the relationship between metal mobilization from sub-surface volcaniclastic rocks and the potential for precipitation of carbonate minerals, various Mg-bearing minerals and chalcedony in a lacustrine spherulitic carbonate setting. This suite of minerals is most likely formed by in-gassing of CO2 to a carbon-limited alkaline spring water, consistent with the reaction of alkali igneous rocks in the subsurface with meteoric groundwater. We suggest that an analogous system to that at East Kirkton caused development of the ‘Pre-Salt’ spherulitic carbonate deposits.

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KW - Palaeozoic

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KW - calcite

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KW - Pre-Salt

KW - palaeogeography

KW - lake

KW - PHREEQC

KW - Europe

KW - sediment mineralogy

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DO - 10.1016/j.gr.2017.04.007

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JO - Gondwana Research

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