Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia

David C.M. Fox (Corresponding Author), Samuel C. Spinks, Robert L. Thorne, Milo Barham, Mehrooz Aspandiar, Joseph G.T. Armstrong, Tonguc Uysal, Nicholas E. Timms, Mark A. Pearce, Michael Verrall, Belinda Godel, Brad Whisson

Research output: Contribution to journalArticle

Abstract

Reduction spheroids are small-scale, biogenic, redox-controlled, metal enrichments that occur within red beds globally. This study provides the first analysis of the compositionally unique reduction spheroids of the Tumblagooda Sandstone. The work aims to account for their composition and consequently improve existing models for reduction spheroids generally, which presently fail to account for the mineralogy of the Tumblagooda Sandstone reduction spheroids. Interstitial areas between detrital grains contained in the cores of these reduction spheroids are dominated by microplaty haematite, in addition to minor amounts of svanbergite, gorceixite, anatase, uraninite, monazite, and illite. The haematite-rich composition, along with an absence of base metal phases and the vanadiferous mica roscoelite, makes these reduction spheroids notable in comparison to other global reduction spheroid occurrences. Analyses of illite crystallinity provide values for samples of the Tumblagooda Sandstone host rock corresponding to heating temperatures of ~200°C. Consequently, while Tumblagooda Sandstone reduction spheroids formed via the typical metabolic processes of dissimilatory metal-reducing bacteria, the combination of a unique mineralogy and illite crystallinity analysis provides evidence of more complex late-stage heating and reoxidation. This has not previously been recognised in other reduction spheroids and therefore expands the existing model for reduction spheroid genesis by also considering the potential for late-stage alteration. As such, future reduction spheroid studies should consider the potential impact of post-formation modification, particularly where they are to be used as evidence of ancient microbial processes; such as in the search for early evidence of life in the geological record on Earth or other planets. Additionally, because of their potential for modification, reduction spheroids serve as a record of the redox history of red beds and their study could provide insights into the evolution of redox conditions within a given red bed during its diagenesis. Finally, this paper also provides insights into the relatively understudied diagenetic history of the Tumblagooda Sandstone; supplying the first reliable and narrow constraints on its thermal history. This has important implications for the thermal history of the Carnarvon Basin and its petroleum prospectivity more broadly.
Original languageEnglish
Number of pages51
JournalSedimentology
Early online date23 Aug 2019
DOIs
Publication statusE-pub ahead of print - 23 Aug 2019

Fingerprint

mineralogy
geochemistry
sandstone
red bed
illite
crystallinity
history
hematite
heating
uraninite
anatase
metal
redox conditions
monazite
geological record
base metal
mica
host rock
diagenesis
planet

Keywords

  • red beds
  • diagenesis
  • redox
  • Carnarvon Basin
  • metal-reducing bacteria
  • haematite
  • Perth Basin
  • Svanbergite
  • CONTINENTAL SEDIMENTS
  • PHOSPHATE-SULFATE MINERALS
  • svanbergite
  • CARBONATE CONCRETIONS
  • CARNARVON BASIN
  • HEMATITE
  • DEPOSITS
  • RED BEDS
  • PROVENANCE
  • DIAGENESIS
  • HUMIC SUBSTANCES

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

Cite this

Fox, D. C. M., Spinks, S. C., Thorne, R. L., Barham, M., Aspandiar, M., Armstrong, J. G. T., ... Whisson, B. (2019). Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia. Sedimentology. https://doi.org/10.1111/sed.12659

Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia. / Fox, David C.M. (Corresponding Author); Spinks, Samuel C.; Thorne, Robert L.; Barham, Milo; Aspandiar, Mehrooz; Armstrong, Joseph G.T.; Uysal, Tonguc; Timms, Nicholas E.; Pearce, Mark A.; Verrall, Michael; Godel, Belinda; Whisson, Brad.

In: Sedimentology, 23.08.2019.

Research output: Contribution to journalArticle

Fox, DCM, Spinks, SC, Thorne, RL, Barham, M, Aspandiar, M, Armstrong, JGT, Uysal, T, Timms, NE, Pearce, MA, Verrall, M, Godel, B & Whisson, B 2019, 'Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia', Sedimentology. https://doi.org/10.1111/sed.12659
Fox, David C.M. ; Spinks, Samuel C. ; Thorne, Robert L. ; Barham, Milo ; Aspandiar, Mehrooz ; Armstrong, Joseph G.T. ; Uysal, Tonguc ; Timms, Nicholas E. ; Pearce, Mark A. ; Verrall, Michael ; Godel, Belinda ; Whisson, Brad. / Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia. In: Sedimentology. 2019.
@article{aeda28dbc9ea438cb1bd8a2a3fdfd8de,
title = "Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia",
abstract = "Reduction spheroids are small-scale, biogenic, redox-controlled, metal enrichments that occur within red beds globally. This study provides the first analysis of the compositionally unique reduction spheroids of the Tumblagooda Sandstone. The work aims to account for their composition and consequently improve existing models for reduction spheroids generally, which presently fail to account for the mineralogy of the Tumblagooda Sandstone reduction spheroids. Interstitial areas between detrital grains contained in the cores of these reduction spheroids are dominated by microplaty haematite, in addition to minor amounts of svanbergite, gorceixite, anatase, uraninite, monazite, and illite. The haematite-rich composition, along with an absence of base metal phases and the vanadiferous mica roscoelite, makes these reduction spheroids notable in comparison to other global reduction spheroid occurrences. Analyses of illite crystallinity provide values for samples of the Tumblagooda Sandstone host rock corresponding to heating temperatures of ~200°C. Consequently, while Tumblagooda Sandstone reduction spheroids formed via the typical metabolic processes of dissimilatory metal-reducing bacteria, the combination of a unique mineralogy and illite crystallinity analysis provides evidence of more complex late-stage heating and reoxidation. This has not previously been recognised in other reduction spheroids and therefore expands the existing model for reduction spheroid genesis by also considering the potential for late-stage alteration. As such, future reduction spheroid studies should consider the potential impact of post-formation modification, particularly where they are to be used as evidence of ancient microbial processes; such as in the search for early evidence of life in the geological record on Earth or other planets. Additionally, because of their potential for modification, reduction spheroids serve as a record of the redox history of red beds and their study could provide insights into the evolution of redox conditions within a given red bed during its diagenesis. Finally, this paper also provides insights into the relatively understudied diagenetic history of the Tumblagooda Sandstone; supplying the first reliable and narrow constraints on its thermal history. This has important implications for the thermal history of the Carnarvon Basin and its petroleum prospectivity more broadly.",
keywords = "red beds, diagenesis, redox, Carnarvon Basin, metal-reducing bacteria, haematite, Perth Basin, Svanbergite, CONTINENTAL SEDIMENTS, PHOSPHATE-SULFATE MINERALS, svanbergite, CARBONATE CONCRETIONS, CARNARVON BASIN, HEMATITE, DEPOSITS, RED BEDS, PROVENANCE, DIAGENESIS, HUMIC SUBSTANCES",
author = "Fox, {David C.M.} and Spinks, {Samuel C.} and Thorne, {Robert L.} and Milo Barham and Mehrooz Aspandiar and Armstrong, {Joseph G.T.} and Tonguc Uysal and Timms, {Nicholas E.} and Pearce, {Mark A.} and Michael Verrall and Belinda Godel and Brad Whisson",
year = "2019",
month = "8",
day = "23",
doi = "10.1111/sed.12659",
language = "English",
journal = "Sedimentology",
issn = "0037-0746",
publisher = "Wiley-Blackwell",

}

TY - JOUR

T1 - Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia

AU - Fox, David C.M.

AU - Spinks, Samuel C.

AU - Thorne, Robert L.

AU - Barham, Milo

AU - Aspandiar, Mehrooz

AU - Armstrong, Joseph G.T.

AU - Uysal, Tonguc

AU - Timms, Nicholas E.

AU - Pearce, Mark A.

AU - Verrall, Michael

AU - Godel, Belinda

AU - Whisson, Brad

PY - 2019/8/23

Y1 - 2019/8/23

N2 - Reduction spheroids are small-scale, biogenic, redox-controlled, metal enrichments that occur within red beds globally. This study provides the first analysis of the compositionally unique reduction spheroids of the Tumblagooda Sandstone. The work aims to account for their composition and consequently improve existing models for reduction spheroids generally, which presently fail to account for the mineralogy of the Tumblagooda Sandstone reduction spheroids. Interstitial areas between detrital grains contained in the cores of these reduction spheroids are dominated by microplaty haematite, in addition to minor amounts of svanbergite, gorceixite, anatase, uraninite, monazite, and illite. The haematite-rich composition, along with an absence of base metal phases and the vanadiferous mica roscoelite, makes these reduction spheroids notable in comparison to other global reduction spheroid occurrences. Analyses of illite crystallinity provide values for samples of the Tumblagooda Sandstone host rock corresponding to heating temperatures of ~200°C. Consequently, while Tumblagooda Sandstone reduction spheroids formed via the typical metabolic processes of dissimilatory metal-reducing bacteria, the combination of a unique mineralogy and illite crystallinity analysis provides evidence of more complex late-stage heating and reoxidation. This has not previously been recognised in other reduction spheroids and therefore expands the existing model for reduction spheroid genesis by also considering the potential for late-stage alteration. As such, future reduction spheroid studies should consider the potential impact of post-formation modification, particularly where they are to be used as evidence of ancient microbial processes; such as in the search for early evidence of life in the geological record on Earth or other planets. Additionally, because of their potential for modification, reduction spheroids serve as a record of the redox history of red beds and their study could provide insights into the evolution of redox conditions within a given red bed during its diagenesis. Finally, this paper also provides insights into the relatively understudied diagenetic history of the Tumblagooda Sandstone; supplying the first reliable and narrow constraints on its thermal history. This has important implications for the thermal history of the Carnarvon Basin and its petroleum prospectivity more broadly.

AB - Reduction spheroids are small-scale, biogenic, redox-controlled, metal enrichments that occur within red beds globally. This study provides the first analysis of the compositionally unique reduction spheroids of the Tumblagooda Sandstone. The work aims to account for their composition and consequently improve existing models for reduction spheroids generally, which presently fail to account for the mineralogy of the Tumblagooda Sandstone reduction spheroids. Interstitial areas between detrital grains contained in the cores of these reduction spheroids are dominated by microplaty haematite, in addition to minor amounts of svanbergite, gorceixite, anatase, uraninite, monazite, and illite. The haematite-rich composition, along with an absence of base metal phases and the vanadiferous mica roscoelite, makes these reduction spheroids notable in comparison to other global reduction spheroid occurrences. Analyses of illite crystallinity provide values for samples of the Tumblagooda Sandstone host rock corresponding to heating temperatures of ~200°C. Consequently, while Tumblagooda Sandstone reduction spheroids formed via the typical metabolic processes of dissimilatory metal-reducing bacteria, the combination of a unique mineralogy and illite crystallinity analysis provides evidence of more complex late-stage heating and reoxidation. This has not previously been recognised in other reduction spheroids and therefore expands the existing model for reduction spheroid genesis by also considering the potential for late-stage alteration. As such, future reduction spheroid studies should consider the potential impact of post-formation modification, particularly where they are to be used as evidence of ancient microbial processes; such as in the search for early evidence of life in the geological record on Earth or other planets. Additionally, because of their potential for modification, reduction spheroids serve as a record of the redox history of red beds and their study could provide insights into the evolution of redox conditions within a given red bed during its diagenesis. Finally, this paper also provides insights into the relatively understudied diagenetic history of the Tumblagooda Sandstone; supplying the first reliable and narrow constraints on its thermal history. This has important implications for the thermal history of the Carnarvon Basin and its petroleum prospectivity more broadly.

KW - red beds

KW - diagenesis

KW - redox

KW - Carnarvon Basin

KW - metal-reducing bacteria

KW - haematite

KW - Perth Basin

KW - Svanbergite

KW - CONTINENTAL SEDIMENTS

KW - PHOSPHATE-SULFATE MINERALS

KW - svanbergite

KW - CARBONATE CONCRETIONS

KW - CARNARVON BASIN

KW - HEMATITE

KW - DEPOSITS

KW - RED BEDS

KW - PROVENANCE

KW - DIAGENESIS

KW - HUMIC SUBSTANCES

UR - http://www.mendeley.com/research/mineralogy-geochemistry-atypical-reduction-spheroids-tumblagooda-sandstone-western-australia

UR - http://www.scopus.com/inward/record.url?scp=85073953283&partnerID=8YFLogxK

U2 - 10.1111/sed.12659

DO - 10.1111/sed.12659

M3 - Article

JO - Sedimentology

JF - Sedimentology

SN - 0037-0746

ER -