Calcium isotope compositions of subduction-related leucite-bearing rocks: Implications for the calcium isotope heterogeneity of the mantle and carbonate recycling in convergent margins.
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| Title: | Calcium isotope compositions of subduction-related leucite-bearing rocks: Implications for the calcium isotope heterogeneity of the mantle and carbonate recycling in convergent margins. |
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| Authors: | Ren, Huange1 (AUTHOR), Casalini, Martina2,3 (AUTHOR), Conticelli, Sandro2,3 (AUTHOR), Chen, Chunfei4 (AUTHOR), Foley, Stephen F.4 (AUTHOR), Feng, Lanping1 (AUTHOR), Liu, Yongsheng1 (AUTHOR) yshliu@cug.edu.cn |
| Source: | Geochimica et Cosmochimica Acta. Jan2024, Vol. 364, p100-113. 14p. |
| Subjects: | Calcium isotopes, Isotopic fractionation, Igneous rocks, Volcanic ash, tuff, etc., Heterogeneity, Carbonate minerals, Carbonates, Carbon isotopes, Subduction |
| Abstract: | Large Ca isotope variations recorded in mantle xenoliths and mantle-derived igneous rocks have been widely used to decode the origin of mantle heterogeneity, especially to trace recycled sedimentary carbonates. However, it is still unclear whether and how the subduction of sedimentary carbonate causes significant Ca isotope fractionation in the mantle in correspondence of convergent margins. In this study, we present Ca isotope data for sixteen silica-undersaturated ultrapotassic leucite-bearing rocks and their clinopyroxene (Cpx) phenocrysts from the "Colli Albani" volcano (Italy), and for six carbonate-bearing sediments from nearby Apennine Chain. These subduction-related volcanic rocks have been widely accepted as deriving from a mantle source that involves recycled carbonated sediments indicated by their enriched incompatible trace elements and radiogenic isotopes, and olivine geochemistry. The δ 44/40Ca values (normalized to NIST SRM 915a) of leucite-bearing rocks are uniform (from 0.64 to 0.79 ‰, with one exception of 0.86 ‰) with an average of 0.72 ± 0.03 ‰, 2SE, N = 16, which is 0.12 ± 0.03 ‰ (2SE) and 0.22 ± 0.03 ‰ (2SE) lower than MORBs (0.84 ± 0.02 ‰, 2SE, N = 25) and BSE (0.94 ± 0.01 ‰, 2SE, N = 14) respectively. In contrast, the carbonate-bearing sediments show variable and notably low δ 44/40Ca values, ranging from 0.44 to 0.77 ‰. The δ 44/40Ca of Cpx (0.70 to 0.76 ‰) is indistinguishable from their host rocks (0.73 to 0.76 ‰). In addition, the lack of correlations between δ 44/40Ca and SiO 2 , CaO, Ni and P 2 O 5 , and the Ca isotopic simulation result indicate that Ca isotope fractionation caused by fractional crystallization is insignificant. Given that the Ca isotope fractionation is limited during the melting of spinel wehrlite-like mantle source (within ∼0.04 to 0.11 ‰), the slightly low δ 44/40Ca values of the Italian leucite-bearing rocks require 10 % to 20 % addition of carbonated sediments in their mantle source. This indicates that recycled carbonated sediments can cause slight δ 44/40Ca heterogeneity (∼0.1 to 0.2) of the mantle wedge in local/regional scales. [ABSTRACT FROM AUTHOR] |
| Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science 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 |
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| Header | DbId: egs DbLabel: Engineering Source An: 174184516 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Calcium isotope compositions of subduction-related leucite-bearing rocks: Implications for the calcium isotope heterogeneity of the mantle and carbonate recycling in convergent margins. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ren%2C+Huange%22">Ren, Huange</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Casalini%2C+Martina%22">Casalini, Martina</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Conticelli%2C+Sandro%22">Conticelli, Sandro</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Chunfei%22">Chen, Chunfei</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Foley%2C+Stephen+F%2E%22">Foley, Stephen F.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Feng%2C+Lanping%22">Feng, Lanping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Yongsheng%22">Liu, Yongsheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yshliu@cug.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Jan2024, Vol. 364, p100-113. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Calcium+isotopes%22">Calcium isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Isotopic+fractionation%22">Isotopic fractionation</searchLink><br /><searchLink fieldCode="DE" term="%22Igneous+rocks%22">Igneous rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Volcanic+ash%2C+tuff%2C+etc%2E%22">Volcanic ash, tuff, etc.</searchLink><br /><searchLink fieldCode="DE" term="%22Heterogeneity%22">Heterogeneity</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonate+minerals%22">Carbonate minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonates%22">Carbonates</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+isotopes%22">Carbon isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Subduction%22">Subduction</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Large Ca isotope variations recorded in mantle xenoliths and mantle-derived igneous rocks have been widely used to decode the origin of mantle heterogeneity, especially to trace recycled sedimentary carbonates. However, it is still unclear whether and how the subduction of sedimentary carbonate causes significant Ca isotope fractionation in the mantle in correspondence of convergent margins. In this study, we present Ca isotope data for sixteen silica-undersaturated ultrapotassic leucite-bearing rocks and their clinopyroxene (Cpx) phenocrysts from the "Colli Albani" volcano (Italy), and for six carbonate-bearing sediments from nearby Apennine Chain. These subduction-related volcanic rocks have been widely accepted as deriving from a mantle source that involves recycled carbonated sediments indicated by their enriched incompatible trace elements and radiogenic isotopes, and olivine geochemistry. The δ 44/40Ca values (normalized to NIST SRM 915a) of leucite-bearing rocks are uniform (from 0.64 to 0.79 ‰, with one exception of 0.86 ‰) with an average of 0.72 ± 0.03 ‰, 2SE, N = 16, which is 0.12 ± 0.03 ‰ (2SE) and 0.22 ± 0.03 ‰ (2SE) lower than MORBs (0.84 ± 0.02 ‰, 2SE, N = 25) and BSE (0.94 ± 0.01 ‰, 2SE, N = 14) respectively. In contrast, the carbonate-bearing sediments show variable and notably low δ 44/40Ca values, ranging from 0.44 to 0.77 ‰. The δ 44/40Ca of Cpx (0.70 to 0.76 ‰) is indistinguishable from their host rocks (0.73 to 0.76 ‰). In addition, the lack of correlations between δ 44/40Ca and SiO 2 , CaO, Ni and P 2 O 5 , and the Ca isotopic simulation result indicate that Ca isotope fractionation caused by fractional crystallization is insignificant. Given that the Ca isotope fractionation is limited during the melting of spinel wehrlite-like mantle source (within ∼0.04 to 0.11 ‰), the slightly low δ 44/40Ca values of the Italian leucite-bearing rocks require 10 % to 20 % addition of carbonated sediments in their mantle source. This indicates that recycled carbonated sediments can cause slight δ 44/40Ca heterogeneity (∼0.1 to 0.2) of the mantle wedge in local/regional scales. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science 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.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.gca.2023.11.022 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 100 Subjects: – SubjectFull: Calcium isotopes Type: general – SubjectFull: Isotopic fractionation Type: general – SubjectFull: Igneous rocks Type: general – SubjectFull: Volcanic ash, tuff, etc. Type: general – SubjectFull: Heterogeneity Type: general – SubjectFull: Carbonate minerals Type: general – SubjectFull: Carbonates Type: general – SubjectFull: Carbon isotopes Type: general – SubjectFull: Subduction Type: general Titles: – TitleFull: Calcium isotope compositions of subduction-related leucite-bearing rocks: Implications for the calcium isotope heterogeneity of the mantle and carbonate recycling in convergent margins. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ren, Huange – PersonEntity: Name: NameFull: Casalini, Martina – PersonEntity: Name: NameFull: Conticelli, Sandro – PersonEntity: Name: NameFull: Chen, Chunfei – PersonEntity: Name: NameFull: Foley, Stephen F. – PersonEntity: Name: NameFull: Feng, Lanping – PersonEntity: Name: NameFull: Liu, Yongsheng IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 00167037 Numbering: – Type: volume Value: 364 Titles: – TitleFull: Geochimica et Cosmochimica Acta Type: main |
| ResultId | 1 |
