Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada
The Franklin sills and dykes on Victoria Island in the Canadian Arctic represent the sub-volcanic plumbing system to the Natkusiak flood basalts, which are associated with the late Neoproterozoic (c. 723–716 Ma) break-up of Rodinia. The Lower Pyramid Sill (LPS) is the distal end of a sill complex th...
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Oxford University Press
2015
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:71481 2023-06-11T04:07:45+02:00 Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada Hayes, Ben Bédard, Jean H. Lissenberg, C. Johan 2015-01-31 application/pdf https://orca.cardiff.ac.uk/id/eprint/71481/ https://doi.org/10.1093/petrology/egu072 https://orca.cardiff.ac.uk/id/eprint/71481/1/Hayes%20et%20al.%202015.pdf en eng Oxford University Press https://orca.cardiff.ac.uk/id/eprint/71481/1/Hayes%20et%20al.%202015.pdf Hayes, Ben, Bédard, Jean H. and Lissenberg, C. Johan https://orca.cardiff.ac.uk/view/cardiffauthors/A127612F.html orcid:0000-0001-7774-2297 orcid:0000-0001-7774-2297 2015. Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada. Journal of Petrology 56 (1) , pp. 83-112. 10.1093/petrology/egu072 https://doi.org/10.1093/petrology%2Fegu072 file https://orca.cardiff.ac.uk/id/eprint/71481/1/Hayes%20et%20al.%202015.pdf doi:10.1093/petrology/egu072 cc_by QE Geology Article PeerReviewed 2015 ftunivcardiff https://doi.org/10.1093/petrology/egu072 2023-04-27T22:33:03Z The Franklin sills and dykes on Victoria Island in the Canadian Arctic represent the sub-volcanic plumbing system to the Natkusiak flood basalts, which are associated with the late Neoproterozoic (c. 723–716 Ma) break-up of Rodinia. The Lower Pyramid Sill (LPS) is the distal end of a sill complex that may be rooted in the Uhuk Massif, a major fault-guided magmatic feeder system. The LPS is unusual for a thin (c. 21 m), shallow, tholeiitic intrusion because it displays well-developed cumulate layering similar to that seen in large layered intrusions. The LPS has an aphanitic, olivine-phyric (c. 5%) Lower Chilled Margin (LCM), a (<1 m thick) dendritic, olivine-phyric Lower Border Zone (LBZ), a (c. 7 m thick) olivine-dominated (up to c. 55%) melagabbro–feldspathic-peridotite zone (OZ), a thin (c. 1 m) clinopyroxene-rich cumulate gabbro (CPZ) containing sector-zoned euhedral clinopyroxene, a (c. 10 m thick) doleritic gabbro zone (DZ), a (<1 m thick) aphyric, dendritic Upper Border Zone (UBZ) and an aphanitic, olivine-phyric (c. 5%) Upper Chilled Margin (UCM). Distinct compositional groups recognized in olivines from the OZ can be associated with specific crystal morphologies, some showing significant reverse zoning. Melt compositions were calculated through application of the olivine–melt Fe ¼ Mg exchange coefficient. The calculations suggest that phenocrystic and primocrystic olivine (Fo88–82) in the LCM–LBZ and lower OZ formed from melts with c. 13–10 wt % MgO. Modeling implies that reversely zoned olivine primocrysts and chadacrysts have rims in equilibrium with melts of c. 10–8 wt % MgO that were saturated only in olivine (þ minor chromite), whereas some olivine cores formed from melts as evolved as c. 6–5 wt % MgO that would have coexisted with a gabbroic assemblage. The presence of multiple olivine populations in the OZ (some reverse zoned) indicates that the LPS did not crystallize from a single pulse of melt that evolved by closed-system fractional crystallization. We propose that the reverse zoning ... Article in Journal/Newspaper Arctic Arctic Victoria Island victoria island Cardiff University: ORCA (Online Research @ Cardiff) Arctic Canada Pyramid ENVELOPE(157.300,157.300,-81.333,-81.333) Journal of Petrology 56 1 83 112 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
topic |
QE Geology |
spellingShingle |
QE Geology Hayes, Ben Bédard, Jean H. Lissenberg, C. Johan Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada |
topic_facet |
QE Geology |
description |
The Franklin sills and dykes on Victoria Island in the Canadian Arctic represent the sub-volcanic plumbing system to the Natkusiak flood basalts, which are associated with the late Neoproterozoic (c. 723–716 Ma) break-up of Rodinia. The Lower Pyramid Sill (LPS) is the distal end of a sill complex that may be rooted in the Uhuk Massif, a major fault-guided magmatic feeder system. The LPS is unusual for a thin (c. 21 m), shallow, tholeiitic intrusion because it displays well-developed cumulate layering similar to that seen in large layered intrusions. The LPS has an aphanitic, olivine-phyric (c. 5%) Lower Chilled Margin (LCM), a (<1 m thick) dendritic, olivine-phyric Lower Border Zone (LBZ), a (c. 7 m thick) olivine-dominated (up to c. 55%) melagabbro–feldspathic-peridotite zone (OZ), a thin (c. 1 m) clinopyroxene-rich cumulate gabbro (CPZ) containing sector-zoned euhedral clinopyroxene, a (c. 10 m thick) doleritic gabbro zone (DZ), a (<1 m thick) aphyric, dendritic Upper Border Zone (UBZ) and an aphanitic, olivine-phyric (c. 5%) Upper Chilled Margin (UCM). Distinct compositional groups recognized in olivines from the OZ can be associated with specific crystal morphologies, some showing significant reverse zoning. Melt compositions were calculated through application of the olivine–melt Fe ¼ Mg exchange coefficient. The calculations suggest that phenocrystic and primocrystic olivine (Fo88–82) in the LCM–LBZ and lower OZ formed from melts with c. 13–10 wt % MgO. Modeling implies that reversely zoned olivine primocrysts and chadacrysts have rims in equilibrium with melts of c. 10–8 wt % MgO that were saturated only in olivine (þ minor chromite), whereas some olivine cores formed from melts as evolved as c. 6–5 wt % MgO that would have coexisted with a gabbroic assemblage. The presence of multiple olivine populations in the OZ (some reverse zoned) indicates that the LPS did not crystallize from a single pulse of melt that evolved by closed-system fractional crystallization. We propose that the reverse zoning ... |
format |
Article in Journal/Newspaper |
author |
Hayes, Ben Bédard, Jean H. Lissenberg, C. Johan |
author_facet |
Hayes, Ben Bédard, Jean H. Lissenberg, C. Johan |
author_sort |
Hayes, Ben |
title |
Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada |
title_short |
Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada |
title_full |
Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada |
title_fullStr |
Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada |
title_full_unstemmed |
Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada |
title_sort |
olivine slurry replenishment and the development of igneous layering in a franklin sill, victoria island, arctic canada |
publisher |
Oxford University Press |
publishDate |
2015 |
url |
https://orca.cardiff.ac.uk/id/eprint/71481/ https://doi.org/10.1093/petrology/egu072 https://orca.cardiff.ac.uk/id/eprint/71481/1/Hayes%20et%20al.%202015.pdf |
long_lat |
ENVELOPE(157.300,157.300,-81.333,-81.333) |
geographic |
Arctic Canada Pyramid |
geographic_facet |
Arctic Canada Pyramid |
genre |
Arctic Arctic Victoria Island victoria island |
genre_facet |
Arctic Arctic Victoria Island victoria island |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/71481/1/Hayes%20et%20al.%202015.pdf Hayes, Ben, Bédard, Jean H. and Lissenberg, C. Johan https://orca.cardiff.ac.uk/view/cardiffauthors/A127612F.html orcid:0000-0001-7774-2297 orcid:0000-0001-7774-2297 2015. Olivine slurry replenishment and the development of igneous layering in a Franklin sill, Victoria Island, Arctic Canada. Journal of Petrology 56 (1) , pp. 83-112. 10.1093/petrology/egu072 https://doi.org/10.1093/petrology%2Fegu072 file https://orca.cardiff.ac.uk/id/eprint/71481/1/Hayes%20et%20al.%202015.pdf doi:10.1093/petrology/egu072 |
op_rights |
cc_by |
op_doi |
https://doi.org/10.1093/petrology/egu072 |
container_title |
Journal of Petrology |
container_volume |
56 |
container_issue |
1 |
container_start_page |
83 |
op_container_end_page |
112 |
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1768380899033874432 |