The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism
Mantle rocks of the Advocate ophiolite near Flatwater Pond (Baie Verte, Newfoundland) are dominated by harzburgite tectonites, which are extensively converted to listvenite along the Baie Verte Road fault and represent a potential gold exploration target. Most Advocate harzburgites have forsteritic...
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ftconicet:oai:ri.conicet.gov.ar:11336/92709 2023-10-09T21:50:05+02:00 The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism Bédard, Jean H. Escayola, Monica Patricia application/pdf http://hdl.handle.net/11336/92709 eng eng National Research Council Canada-NRC Research Press info:eu-repo/semantics/altIdentifier/doi/10.1139/E10-004 info:eu-repo/semantics/altIdentifier/url/https://www.nrcresearchpress.com/doi/10.1139/E10-004#.Xf1FPlVKiUk http://hdl.handle.net/11336/92709 Bédard, Jean H.; Escayola, Monica Patricia; The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism; National Research Council Canada-NRC Research Press; Canadian Journal Of Earth Sciences; 47; 3; 3-2010; 237-253 0008-4077 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Ophilites Mantle Metasomatism Newfoundland https://purl.org/becyt/ford/1.7 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1139/E10-004 2023-09-24T19:29:06Z Mantle rocks of the Advocate ophiolite near Flatwater Pond (Baie Verte, Newfoundland) are dominated by harzburgite tectonites, which are extensively converted to listvenite along the Baie Verte Road fault and represent a potential gold exploration target. Most Advocate harzburgites have forsteritic olivine (Fo90.5 to Fo93) and Cr-spinels, with Cr# (= 100Cr/(Cr + Al)) between 52 and 64 and Mg# (= 100Mg/(Mg + Fe2+)) between 56 and 68. These mineral chemical signatures, together with high whole-rock MgO (46%-48%), low Al2O3 (<1%), and TiO2 (<0.003%), imply the Advocate harzburgites are refractory residues after ca. 25%-35% melting. Cr-spinel compositions of Advocate mantle rocks overlap with Cr-spinels from the mantle rocks of the Point Rousse and Betts Cove ophiolites, with Mg# higher than those of Bay of Islands or Thetford Mines mantle Cr-spinels. Although refractory in terms of major elements and mineral chemistry, Advocate harzburgites contain high La-Ce-Pr-Pb-Nd-Sm-Zr contents suggestive of pervasive metasomatism. Similar geochemical signatures occur in all ophiolitic mantle rocks from the Baie Verte Peninsula examined so far. The enrichments are not consistent with supra-subduction zone syn-melting metasomatism as observed in other Appalachian ophiolites. The apparent absence of visible metasomatic channels in most outcrops suggests that metasomatism occurred before obduction by diffuse percolation, but the nature and origin of the metasomatic agent remain speculative. The similarities of mineral and whole-rock geochemistry imply that all mantle rocks from Baie Verte ophiolites are correlative and may represent remnants of a single obducted slab. Fil: Bédard, Jean H. Geological Survey Of Canada; Canadá Fil: Escayola, Monica Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios ... Article in Journal/Newspaper Baie Verte Newfoundland CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Canada Pablo ENVELOPE(-63.717,-63.717,-64.283,-64.283) Verte ENVELOPE(141.192,141.192,-66.740,-66.740) Baie Verte ENVELOPE(-56.182,-56.182,49.933,49.933) Baie Verte Peninsula ENVELOPE(-56.498,-56.498,49.833,49.833) Betts Cove ENVELOPE(-55.781,-55.781,49.817,49.817) Point Rousse ENVELOPE(-56.015,-56.015,50.033,50.033) Canadian Journal of Earth Sciences 47 3 237 253 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Ophilites Mantle Metasomatism Newfoundland https://purl.org/becyt/ford/1.7 https://purl.org/becyt/ford/1 |
spellingShingle |
Ophilites Mantle Metasomatism Newfoundland https://purl.org/becyt/ford/1.7 https://purl.org/becyt/ford/1 Bédard, Jean H. Escayola, Monica Patricia The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism |
topic_facet |
Ophilites Mantle Metasomatism Newfoundland https://purl.org/becyt/ford/1.7 https://purl.org/becyt/ford/1 |
description |
Mantle rocks of the Advocate ophiolite near Flatwater Pond (Baie Verte, Newfoundland) are dominated by harzburgite tectonites, which are extensively converted to listvenite along the Baie Verte Road fault and represent a potential gold exploration target. Most Advocate harzburgites have forsteritic olivine (Fo90.5 to Fo93) and Cr-spinels, with Cr# (= 100Cr/(Cr + Al)) between 52 and 64 and Mg# (= 100Mg/(Mg + Fe2+)) between 56 and 68. These mineral chemical signatures, together with high whole-rock MgO (46%-48%), low Al2O3 (<1%), and TiO2 (<0.003%), imply the Advocate harzburgites are refractory residues after ca. 25%-35% melting. Cr-spinel compositions of Advocate mantle rocks overlap with Cr-spinels from the mantle rocks of the Point Rousse and Betts Cove ophiolites, with Mg# higher than those of Bay of Islands or Thetford Mines mantle Cr-spinels. Although refractory in terms of major elements and mineral chemistry, Advocate harzburgites contain high La-Ce-Pr-Pb-Nd-Sm-Zr contents suggestive of pervasive metasomatism. Similar geochemical signatures occur in all ophiolitic mantle rocks from the Baie Verte Peninsula examined so far. The enrichments are not consistent with supra-subduction zone syn-melting metasomatism as observed in other Appalachian ophiolites. The apparent absence of visible metasomatic channels in most outcrops suggests that metasomatism occurred before obduction by diffuse percolation, but the nature and origin of the metasomatic agent remain speculative. The similarities of mineral and whole-rock geochemistry imply that all mantle rocks from Baie Verte ophiolites are correlative and may represent remnants of a single obducted slab. Fil: Bédard, Jean H. Geological Survey Of Canada; Canadá Fil: Escayola, Monica Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios ... |
format |
Article in Journal/Newspaper |
author |
Bédard, Jean H. Escayola, Monica Patricia |
author_facet |
Bédard, Jean H. Escayola, Monica Patricia |
author_sort |
Bédard, Jean H. |
title |
The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism |
title_short |
The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism |
title_full |
The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism |
title_fullStr |
The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism |
title_full_unstemmed |
The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism |
title_sort |
advocate ophiolite mantle, baie verte, newfoundland: regional correlations and evidence for metasomatism |
publisher |
National Research Council Canada-NRC Research Press |
url |
http://hdl.handle.net/11336/92709 |
long_lat |
ENVELOPE(-63.717,-63.717,-64.283,-64.283) ENVELOPE(141.192,141.192,-66.740,-66.740) ENVELOPE(-56.182,-56.182,49.933,49.933) ENVELOPE(-56.498,-56.498,49.833,49.833) ENVELOPE(-55.781,-55.781,49.817,49.817) ENVELOPE(-56.015,-56.015,50.033,50.033) |
geographic |
Canada Pablo Verte Baie Verte Baie Verte Peninsula Betts Cove Point Rousse |
geographic_facet |
Canada Pablo Verte Baie Verte Baie Verte Peninsula Betts Cove Point Rousse |
genre |
Baie Verte Newfoundland |
genre_facet |
Baie Verte Newfoundland |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1139/E10-004 info:eu-repo/semantics/altIdentifier/url/https://www.nrcresearchpress.com/doi/10.1139/E10-004#.Xf1FPlVKiUk http://hdl.handle.net/11336/92709 Bédard, Jean H.; Escayola, Monica Patricia; The advocate ophiolite mantle, Baie Verte, Newfoundland: Regional correlations and evidence for metasomatism; National Research Council Canada-NRC Research Press; Canadian Journal Of Earth Sciences; 47; 3; 3-2010; 237-253 0008-4077 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1139/E10-004 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
47 |
container_issue |
3 |
container_start_page |
237 |
op_container_end_page |
253 |
_version_ |
1779313154381053952 |