View in EDS HTML Full Text PDF Full Text

Constraints on the distribution, composition, and lithology of eclogite and pyroxenite from the central Slave craton.

Saved in:
Bibliographic Details
Title: Constraints on the distribution, composition, and lithology of eclogite and pyroxenite from the central Slave craton.
Authors: Hardman, Matthew F.1,2 (AUTHOR) mhardman@gia.edu, Stachel, Thomas2 (AUTHOR), Pearson, D. Graham2 (AUTHOR), Stern, Richard A.2 (AUTHOR), Lai, Mei Yan1 (AUTHOR)
Source: Mineralogy & Petrology. Sep2025, Vol. 119 Issue 3, p627-647. 21p.
Subjects: Eclogite, Pyroxenite, Cratons, Oxygen isotopes, Kimberlite, Petrogenesis, Lithosphere
Geographic Terms: Canada
Abstract: We investigate the petrogenesis of a newly collected suite of 225 barren and one diamond-bearing eclogite and pyroxenite microxenoliths from the A154, Panda, and DO-27 kimberlites from the Lac de Gras region, Northwest Territories, Canada. All samples contain low-Cr garnet (Cr2O3 < 1 wt%) and were analysed for major-element compositions of garnet and clinopyroxene. Trace-element compositions were determined for 140 mineral pairs, and δ18O values for garnets from 160 samples. Geothermometry indicates that eclogite and pyroxenite xenoliths from A154 are distributed throughout the subcratonic lithospheric mantle (SCLM), from ~ 80 km to as deep as ~ 200 km. Eclogites/pyroxenites from A154 that equilibrated shallower than ~ 170 km are derived from a variety of protoliths including basaltic- and cumulate-type oceanic crust. The majority of these rocks have δ18O values (average + 5.54 ± 0.89‰, 2σ) within or below the canonical mantle range. The deeper suite of eclogites (≥ 170 km) typically have Ca-rich oceanic cumulate-type protoliths, with garnet δ18O values (+ 4.95 ± 0.58‰) mostly below the mantle range. Eclogite/pyroxenite microxenoliths from Panda and DO-27 have protoliths that include basaltic- and cumulate-type oceanic crust. Oxygen isotope compositions for low-Cr garnets from DO-27 have a similar distribution to A154 whereas those from Panda are largely within or near the mantle range. Our expanded dataset shows that eclogites are key components in mantle root assembly, and reinforces previous findings of a lithological, mineralogical, and compositional boundary at approximately 170 km depth in the Slave craton lithosphere. [ABSTRACT FROM AUTHOR]
Copyright of Mineralogy & Petrology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: egs
DbLabel: Engineering Source
An: 188315855
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Constraints on the distribution, composition, and lithology of eclogite and pyroxenite from the central Slave craton.
– Name: Author
  Label: Authors
  Group: Au
  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Hardman%2C+Matthew+F%2E%22&quot;&gt;Hardman, Matthew F.&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; mhardman@gia.edu&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Stachel%2C+Thomas%22&quot;&gt;Stachel, Thomas&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Pearson%2C+D%2E+Graham%22&quot;&gt;Pearson, D. Graham&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Stern%2C+Richard+A%2E%22&quot;&gt;Stern, Richard A.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Lai%2C+Mei+Yan%22&quot;&gt;Lai, Mei Yan&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Mineralogy+%26+Petrology%22&quot;&gt;Mineralogy &amp; Petrology&lt;/searchLink&gt;. Sep2025, Vol. 119 Issue 3, p627-647. 21p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Eclogite%22&quot;&gt;Eclogite&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Pyroxenite%22&quot;&gt;Pyroxenite&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Cratons%22&quot;&gt;Cratons&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Oxygen+isotopes%22&quot;&gt;Oxygen isotopes&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Kimberlite%22&quot;&gt;Kimberlite&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Petrogenesis%22&quot;&gt;Petrogenesis&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Lithosphere%22&quot;&gt;Lithosphere&lt;/searchLink&gt;
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Canada%22&quot;&gt;Canada&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We investigate the petrogenesis of a newly collected suite of 225 barren and one diamond-bearing eclogite and pyroxenite microxenoliths from the A154, Panda, and DO-27 kimberlites from the Lac de Gras region, Northwest Territories, Canada. All samples contain low-Cr garnet (Cr2O3 &lt; 1 wt%) and were analysed for major-element compositions of garnet and clinopyroxene. Trace-element compositions were determined for 140 mineral pairs, and δ18O values for garnets from 160 samples. Geothermometry indicates that eclogite and pyroxenite xenoliths from A154 are distributed throughout the subcratonic lithospheric mantle (SCLM), from ~ 80 km to as deep as ~ 200 km. Eclogites/pyroxenites from A154 that equilibrated shallower than ~ 170 km are derived from a variety of protoliths including basaltic- and cumulate-type oceanic crust. The majority of these rocks have δ18O values (average + 5.54 &#177; 0.89‰, 2σ) within or below the canonical mantle range. The deeper suite of eclogites (≥ 170 km) typically have Ca-rich oceanic cumulate-type protoliths, with garnet δ18O values (+ 4.95 &#177; 0.58‰) mostly below the mantle range. Eclogite/pyroxenite microxenoliths from Panda and DO-27 have protoliths that include basaltic- and cumulate-type oceanic crust. Oxygen isotope compositions for low-Cr garnets from DO-27 have a similar distribution to A154 whereas those from Panda are largely within or near the mantle range. Our expanded dataset shows that eclogites are key components in mantle root assembly, and reinforces previous findings of a lithological, mineralogical, and compositional boundary at approximately 170 km depth in the Slave craton lithosphere. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: &lt;i&gt;Copyright of Mineralogy &amp; Petrology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=188315855
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s00710-024-00884-z
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 21
        StartPage: 627
    Subjects:
      – SubjectFull: Eclogite
        Type: general
      – SubjectFull: Pyroxenite
        Type: general
      – SubjectFull: Cratons
        Type: general
      – SubjectFull: Oxygen isotopes
        Type: general
      – SubjectFull: Kimberlite
        Type: general
      – SubjectFull: Petrogenesis
        Type: general
      – SubjectFull: Lithosphere
        Type: general
      – SubjectFull: Canada
        Type: general
    Titles:
      – TitleFull: Constraints on the distribution, composition, and lithology of eclogite and pyroxenite from the central Slave craton.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Hardman, Matthew F.
      – PersonEntity:
          Name:
            NameFull: Stachel, Thomas
      – PersonEntity:
          Name:
            NameFull: Pearson, D. Graham
      – PersonEntity:
          Name:
            NameFull: Stern, Richard A.
      – PersonEntity:
          Name:
            NameFull: Lai, Mei Yan
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 09
              Text: Sep2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 09300708
          Numbering:
            – Type: volume
              Value: 119
            – Type: issue
              Value: 3
          Titles:
            – TitleFull: Mineralogy & Petrology
              Type: main
ResultId 1