Metal flux from dissolution of iron oxide grain coatings in sandstones

John Parnell; X Wang; A Raab; J Feldmann; C Brolly; R.  Michie; J.  Armstrong

doi:10.1155/2021/5513490

Metal flux from dissolution of iron oxide grain coatings in sandstones

John Parnell^* (Corresponding Author), X Wang, A Raab, J Feldmann, C Brolly, R. Michie, J. Armstrong

^*Corresponding author for this work

University of Aberdeen

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Abstract

Iron oxide grain coatings in red sandstones contain trace metals that are released upon dissolution of the coatings. Analyses by ICP-MS following acid leaching of the grain coatings show that the dissolved metals can constitute an ore-forming fluid, as hypothesized in models for sandstone13 hosted ore deposits. Mean compositions of 37 samples, mostly of Triassic to Devonian age, from across Britain and Ireland are 13.6 ppm copper, 2.9 ppm cobalt, 11.4 ppm vanadium and 0.4 ppm uranium. These contents at the basin scale are adequate to form the observed range of ore deposits 16 in red beds. The migration of hydrocarbons or brines can cause the dissolution of grain coatings, and contributes to controlling the distribution of ore deposits. Future measurements should test red beds derived from uplifted, mineralized plate margins, in which sandstones may be pre-loaded with ore metals.

Original language	English
Article number	5513490
Number of pages	14
Journal	GeoFluids
Volume	2021
DOIs	https://doi.org/10.1155/2021/5513490
Publication status	Published - 18 May 2021

Bibliographical note

Acknowledgements
Sandstone samples were kindly contributed by the Geological Survey of Northern Ireland, D. Halbert, R. Starkey, and L. Bullock. This work was partly supported by NERC grant NE/M010953/1. Electron Microscopy was performed with the help of J. Still in the ACEMAC Facility at the University of Aberdeen.

Keywords

Red sandstone
red beds
grain coatings
ore fluid
diagenesis
copper
cobalt
vanadium
uranium
selenium

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Copyright © 2021 J. Parnell et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/
Final published version, 1.88 MBLicence: CC BY

Aberdeen Centre for Electron Microscopy, Analysis and Characterisation (ACEMAC):
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Research Facilities: Facility

Cite this

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title = "Metal flux from dissolution of iron oxide grain coatings in sandstones",

abstract = "Iron oxide grain coatings in red sandstones contain trace metals that are released upon dissolution of the coatings. Analyses by ICP-MS following acid leaching of the grain coatings show that the dissolved metals can constitute an ore-forming fluid, as hypothesized in models for sandstone13 hosted ore deposits. Mean compositions of 37 samples, mostly of Triassic to Devonian age, from across Britain and Ireland are 13.6 ppm copper, 2.9 ppm cobalt, 11.4 ppm vanadium and 0.4 ppm uranium. These contents at the basin scale are adequate to form the observed range of ore deposits 16 in red beds. The migration of hydrocarbons or brines can cause the dissolution of grain coatings, and contributes to controlling the distribution of ore deposits. Future measurements should test red beds derived from uplifted, mineralized plate margins, in which sandstones may be pre-loaded with ore metals.",

keywords = "Red sandstone, red beds, grain coatings, ore fluid, diagenesis, copper, cobalt, vanadium, uranium, selenium",

author = "John Parnell and X Wang and A Raab and J Feldmann and C Brolly and R. Michie and J. Armstrong",

note = "Acknowledgements Sandstone samples were kindly contributed by the Geological Survey of Northern Ireland, D. Halbert, R. Starkey, and L. Bullock. This work was partly supported by NERC grant NE/M010953/1. Electron Microscopy was performed with the help of J. Still in the ACEMAC Facility at the University of Aberdeen.",

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AU - Parnell, John

AU - Wang, X

AU - Raab, A

AU - Feldmann, J

AU - Brolly, C

AU - Michie, R.

AU - Armstrong, J.

N1 - Acknowledgements Sandstone samples were kindly contributed by the Geological Survey of Northern Ireland, D. Halbert, R. Starkey, and L. Bullock. This work was partly supported by NERC grant NE/M010953/1. Electron Microscopy was performed with the help of J. Still in the ACEMAC Facility at the University of Aberdeen.

PY - 2021/5/18

Y1 - 2021/5/18

N2 - Iron oxide grain coatings in red sandstones contain trace metals that are released upon dissolution of the coatings. Analyses by ICP-MS following acid leaching of the grain coatings show that the dissolved metals can constitute an ore-forming fluid, as hypothesized in models for sandstone13 hosted ore deposits. Mean compositions of 37 samples, mostly of Triassic to Devonian age, from across Britain and Ireland are 13.6 ppm copper, 2.9 ppm cobalt, 11.4 ppm vanadium and 0.4 ppm uranium. These contents at the basin scale are adequate to form the observed range of ore deposits 16 in red beds. The migration of hydrocarbons or brines can cause the dissolution of grain coatings, and contributes to controlling the distribution of ore deposits. Future measurements should test red beds derived from uplifted, mineralized plate margins, in which sandstones may be pre-loaded with ore metals.

AB - Iron oxide grain coatings in red sandstones contain trace metals that are released upon dissolution of the coatings. Analyses by ICP-MS following acid leaching of the grain coatings show that the dissolved metals can constitute an ore-forming fluid, as hypothesized in models for sandstone13 hosted ore deposits. Mean compositions of 37 samples, mostly of Triassic to Devonian age, from across Britain and Ireland are 13.6 ppm copper, 2.9 ppm cobalt, 11.4 ppm vanadium and 0.4 ppm uranium. These contents at the basin scale are adequate to form the observed range of ore deposits 16 in red beds. The migration of hydrocarbons or brines can cause the dissolution of grain coatings, and contributes to controlling the distribution of ore deposits. Future measurements should test red beds derived from uplifted, mineralized plate margins, in which sandstones may be pre-loaded with ore metals.

KW - Red sandstone

KW - red beds

KW - grain coatings

KW - ore fluid

KW - diagenesis

KW - copper

KW - cobalt

KW - vanadium

KW - uranium

KW - selenium

U2 - 10.1155/2021/5513490

DO - 10.1155/2021/5513490

M3 - Article

SN - 1468-8115

VL - 2021

JO - GeoFluids

JF - GeoFluids

M1 - 5513490

ER -

Metal flux from dissolution of iron oxide grain coatings in sandstones

Abstract

Bibliographical note

Keywords

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