Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments

J Parnell; M Perez; Joseph Armstrong; L Bullock; J Feldmann; A J  Boyce

doi:10.7185/geochemlet.1812

Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments

J Parnell, M Perez, Joseph Armstrong, L Bullock, J Feldmann, A J Boyce

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Abstract

The Neoproterozoic Dalradian Supergroup contains widespread diagenetic pyrite, in both carbonaceous shales and glacial diamictites, deposited in relatively reducing and oxidizing conditions respectively. The trace element compositions of the pyrite, and consequently the whole rock compositions, contrast between the two lithologies. The highest amounts of selenium, tellurium and gold are all found in diamictite-hosted pyrite. The data suggest that increased mobility of these elements in oxidizing conditions led to greater uptake when pyrite was precipitated. As one model for the formation of orogenic gold ore deposits assumes a pyrite-rich protolith, pyrite formed during relatively oxidizing conditions could make a contribution, including the widespread pyrite precipitated during the Neoproterozoic ‘Snowball Earth’ glaciations.

Original language	English
Pages (from-to)	12-16
Number of pages	5
Journal	Geochemical Perspectives Letters
Volume	7
DOIs	https://doi.org/10.7185/geochemlet.1812
Publication status	Published - 2 May 2018

Keywords

Neoproterozoic
Dalradian supergroup
selenium
tellurium
gold
snowball earth

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10.7185/geochemlet.1812Licence: CC BY

Geochemistry and metallogeny of Neoproterozoic pyrite in oxic
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Final published version, 2.04 MBLicence: CC BY

Cite this

@article{631c9077069d4c14b3c9aa33ba30f7cd,

title = "Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments",

abstract = "The Neoproterozoic Dalradian Supergroup contains widespread diagenetic pyrite, in both carbonaceous shales and glacial diamictites, deposited in relatively reducing and oxidizing conditions respectively. The trace element compositions of the pyrite, and consequently the whole rock compositions, contrast between the two lithologies. The highest amounts of selenium, tellurium and gold are all found in diamictite-hosted pyrite. The data suggest that increased mobility of these elements in oxidizing conditions led to greater uptake when pyrite was precipitated. As one model for the formation of orogenic gold ore deposits assumes a pyrite-rich protolith, pyrite formed during relatively oxidizing conditions could make a contribution, including the widespread pyrite precipitated during the Neoproterozoic {\textquoteleft}Snowball Earth{\textquoteright} glaciations.",

keywords = "Neoproterozoic, Dalradian supergroup , selenium, tellurium, gold, snowball earth",

author = "J Parnell and M Perez and Joseph Armstrong and L Bullock and J Feldmann and Boyce, {A J}",

note = "This work was supported by the NERC under Grant number NE/L001764/1. AJB is funded by NERC support of the Isotope Community Support Facility at SUERC. We are grateful to S. Mojzsis and I. Mukherjee for critical reviews, and A. Spencer and K. Mackay for help with sampling",

year = "2018",

month = may,

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doi = "10.7185/geochemlet.1812",

language = "English",

volume = "7",

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journal = "Geochemical Perspectives Letters",

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publisher = "European Association of Geochemistry",

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TY - JOUR

T1 - Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments

AU - Parnell, J

AU - Perez, M

AU - Armstrong, Joseph

AU - Bullock, L

AU - Feldmann, J

AU - Boyce, A J

N1 - This work was supported by the NERC under Grant number NE/L001764/1. AJB is funded by NERC support of the Isotope Community Support Facility at SUERC. We are grateful to S. Mojzsis and I. Mukherjee for critical reviews, and A. Spencer and K. Mackay for help with sampling

PY - 2018/5/2

Y1 - 2018/5/2

N2 - The Neoproterozoic Dalradian Supergroup contains widespread diagenetic pyrite, in both carbonaceous shales and glacial diamictites, deposited in relatively reducing and oxidizing conditions respectively. The trace element compositions of the pyrite, and consequently the whole rock compositions, contrast between the two lithologies. The highest amounts of selenium, tellurium and gold are all found in diamictite-hosted pyrite. The data suggest that increased mobility of these elements in oxidizing conditions led to greater uptake when pyrite was precipitated. As one model for the formation of orogenic gold ore deposits assumes a pyrite-rich protolith, pyrite formed during relatively oxidizing conditions could make a contribution, including the widespread pyrite precipitated during the Neoproterozoic ‘Snowball Earth’ glaciations.

AB - The Neoproterozoic Dalradian Supergroup contains widespread diagenetic pyrite, in both carbonaceous shales and glacial diamictites, deposited in relatively reducing and oxidizing conditions respectively. The trace element compositions of the pyrite, and consequently the whole rock compositions, contrast between the two lithologies. The highest amounts of selenium, tellurium and gold are all found in diamictite-hosted pyrite. The data suggest that increased mobility of these elements in oxidizing conditions led to greater uptake when pyrite was precipitated. As one model for the formation of orogenic gold ore deposits assumes a pyrite-rich protolith, pyrite formed during relatively oxidizing conditions could make a contribution, including the widespread pyrite precipitated during the Neoproterozoic ‘Snowball Earth’ glaciations.

KW - Neoproterozoic

KW - Dalradian supergroup

KW - selenium

KW - tellurium

KW - gold

KW - snowball earth

U2 - 10.7185/geochemlet.1812

DO - 10.7185/geochemlet.1812

M3 - Article

VL - 7

SP - 12

EP - 16

JO - Geochemical Perspectives Letters

JF - Geochemical Perspectives Letters

SN - 2410-339X

ER -

Geochemistry and metallogeny of Neoproterozoic pyrite in oxic and anoxic sediments

Abstract

Keywords

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