Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada
The Lower Head Formation in the Parson’s Pond area (western Newfoundland, Canada) comprises siltstones with very fine- to fine-grained sandstones. Petrography confirms that these sandstones are matrix rich, essentially wackes, with detrital minerals including quartz, feldspar, biotite, and numerous...
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ftunivtoronto:oai:localhost:1807/74228 2023-05-15T17:22:02+02:00 Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada Blamey, Nigel Azmy, Karem Conliffe, James 2016-05-21 http://hdl.handle.net/1807/74228 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0169 unknown NRC Research Press (a division of Canadian Science Publishing) 0008-4077 http://hdl.handle.net/1807/74228 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0169 Article 2016 ftunivtoronto 2020-06-17T12:01:12Z The Lower Head Formation in the Parson’s Pond area (western Newfoundland, Canada) comprises siltstones with very fine- to fine-grained sandstones. Petrography confirms that these sandstones are matrix rich, essentially wackes, with detrital minerals including quartz, feldspar, biotite, and numerous accessory minerals. Observed petrographic features suggest that the Lower Head sediments are the distal product of erosion, with sediment sourced from the Dashwoods microcontinent and Lushs Bight oceanic tract and thoroughly mixed in an earlier basin prior to final deposition in a trench slope basin. The Lower Head Formation Sandstones have low porosity, with early diagenetic cements (C1) and later calcite in crosscutting calcite veinlets (C2). Petrographic, isotopic and fluid inclusion analyses indicate that C1 cements formed during the early stages of diagenesis. Both δ13C and δ18O isotopes for the C1 calcite cements are isotopically heavier than the C2 calcite veins. Fluid inclusion homogenization temperatures for the later crosscutting C2 calcite generally range between 78 and 116 °C, with a mean of 100.7 °C (± 9.75 °C) and fluid salinities of 5.41 to 15.98 eq. wt.% NaCl. Fluid inclusion gas analysis from C2 calcite confirms that CO2/CH4 generally has an inverse correlation with N2/Ar. Petroleum-bearing fluid inclusions were also recorded in C2 calcite cements, indicating that these fractures were conduits for hydrocarbon migration prior and/or during cementation. However, the early cementation and associated low porosity of the Lower Head Formation sandstones indicate that they offer restricted pathways to migrating fluids and volatiles, and any hydrocarbon migration must have been fracture controlled. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. Article in Journal/Newspaper Newfoundland University of Toronto: Research Repository T-Space Canada Lower Head ENVELOPE(-57.765,-57.765,49.950,49.950) |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
description |
The Lower Head Formation in the Parson’s Pond area (western Newfoundland, Canada) comprises siltstones with very fine- to fine-grained sandstones. Petrography confirms that these sandstones are matrix rich, essentially wackes, with detrital minerals including quartz, feldspar, biotite, and numerous accessory minerals. Observed petrographic features suggest that the Lower Head sediments are the distal product of erosion, with sediment sourced from the Dashwoods microcontinent and Lushs Bight oceanic tract and thoroughly mixed in an earlier basin prior to final deposition in a trench slope basin. The Lower Head Formation Sandstones have low porosity, with early diagenetic cements (C1) and later calcite in crosscutting calcite veinlets (C2). Petrographic, isotopic and fluid inclusion analyses indicate that C1 cements formed during the early stages of diagenesis. Both δ13C and δ18O isotopes for the C1 calcite cements are isotopically heavier than the C2 calcite veins. Fluid inclusion homogenization temperatures for the later crosscutting C2 calcite generally range between 78 and 116 °C, with a mean of 100.7 °C (± 9.75 °C) and fluid salinities of 5.41 to 15.98 eq. wt.% NaCl. Fluid inclusion gas analysis from C2 calcite confirms that CO2/CH4 generally has an inverse correlation with N2/Ar. Petroleum-bearing fluid inclusions were also recorded in C2 calcite cements, indicating that these fractures were conduits for hydrocarbon migration prior and/or during cementation. However, the early cementation and associated low porosity of the Lower Head Formation sandstones indicate that they offer restricted pathways to migrating fluids and volatiles, and any hydrocarbon migration must have been fracture controlled. The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author. |
format |
Article in Journal/Newspaper |
author |
Blamey, Nigel Azmy, Karem Conliffe, James |
spellingShingle |
Blamey, Nigel Azmy, Karem Conliffe, James Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada |
author_facet |
Blamey, Nigel Azmy, Karem Conliffe, James |
author_sort |
Blamey, Nigel |
title |
Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada |
title_short |
Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada |
title_full |
Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada |
title_fullStr |
Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada |
title_full_unstemmed |
Geochemistry and diagenetic history of the Ordovician Lower Head Formation Sandstones, Western Newfoundland, Canada |
title_sort |
geochemistry and diagenetic history of the ordovician lower head formation sandstones, western newfoundland, canada |
publisher |
NRC Research Press (a division of Canadian Science Publishing) |
publishDate |
2016 |
url |
http://hdl.handle.net/1807/74228 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0169 |
long_lat |
ENVELOPE(-57.765,-57.765,49.950,49.950) |
geographic |
Canada Lower Head |
geographic_facet |
Canada Lower Head |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
0008-4077 http://hdl.handle.net/1807/74228 http://www.nrcresearchpress.com/doi/abs/10.1139/cjes-2015-0169 |
_version_ |
1766108264212201472 |