Rift and plate boundary evolution across two supercontinent cycles.
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| Title: | Rift and plate boundary evolution across two supercontinent cycles. |
|---|---|
| Authors: | Merdith, Andrew S.1 andrew.merdith@univ-lyon1.fr, Williams, Simon E.1, Brune, Sascha1, Collins, Alan S.1, Müller, R. Dietmar1 |
| Source: | Global & Planetary Change. Feb2019, Vol. 173, p1-14. 14p. |
| Subjects: | Rifts (Geology), Geographic boundaries, Supercontinent cycles, Earth's mantle, Land consolidation |
| Abstract: | Abstract The extent of continental rifts and subduction zones through deep geological time provides insights into the mechanisms behind supercontinent cycles and the long term evolution of the mantle. However, previous compilations have stopped short of mapping the locations of rifts and subduction zones continuously since the Neoproterozoic and within a self-consistent plate kinematic framework. Using recently published plate models with continuously closing boundaries for the Neoproterozoic and Phanerozoic, we estimate how rift and peri-continental subduction length vary from 1 Ga to present and test hypotheses pertaining to the supercontinent cycle and supercontinent breakup. We extract measures of continental perimeter-to-area ratio as a proxy for the existence of a supercontinent, where during times of supercontinent existence the perimeter-to-area ratio should be low, and during assembly and dispersal it should be high. The amalgamation of Gondwana is clearly represented by changes in the length of peri-continental subduction and the breakup of Rodinia and Pangea by changes in rift lengths. The assembly of Pangea is not clearly defined using plate boundary lengths, likely because its formation resulted from the collision of only two large continents. Instead the assembly of Gondwana (ca. 520 Ma) marks the most prominent change in arc length and perimeter-to-area ratio during the last billion years suggesting that Gondwana during the Early Palaeozoic could explicitly be considered part of a Phanerozoic supercontinent. Consequently, the traditional understanding of the supercontinent cycle, in terms of supercontinent existence for short periods of time before dispersal and re-accretion, may be inadequate to fully describe the cycle. Instead, either a two-stage supercontinent cycle could be a more appropriate concept, or alternatively the time period of 1 to 0 Ga has to be considered as being dominated by supercontinent existence, with brief periods of dispersal and amalgamation. Highlights • Compilation of rifting events in the Neoproterozoic • Analysis of continental arc, continental rift and connectedness of continental lithosphere for the last 1 Ga • Two stage supercontinent cycle may better explain changes in the connectedness of continental lithosphere • Extraversion and introversion models of successive supercontinents occur on different timescales [ABSTRACT FROM AUTHOR] |
| Copyright of Global & Planetary Change is the property of Elsevier B.V. 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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 134114716 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Rift and plate boundary evolution across two supercontinent cycles. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Merdith%2C+Andrew+S%2E%22">Merdith, Andrew S.</searchLink><relatesTo>1</relatesTo><i> andrew.merdith@univ-lyon1.fr</i><br /><searchLink fieldCode="AR" term="%22Williams%2C+Simon+E%2E%22">Williams, Simon E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Brune%2C+Sascha%22">Brune, Sascha</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Collins%2C+Alan+S%2E%22">Collins, Alan S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Müller%2C+R%2E+Dietmar%22">Müller, R. Dietmar</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Global+%26+Planetary+Change%22">Global & Planetary Change</searchLink>. Feb2019, Vol. 173, p1-14. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Rifts+%28Geology%29%22">Rifts (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Geographic+boundaries%22">Geographic boundaries</searchLink><br /><searchLink fieldCode="DE" term="%22Supercontinent+cycles%22">Supercontinent cycles</searchLink><br /><searchLink fieldCode="DE" term="%22Earth's+mantle%22">Earth's mantle</searchLink><br /><searchLink fieldCode="DE" term="%22Land+consolidation%22">Land consolidation</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract The extent of continental rifts and subduction zones through deep geological time provides insights into the mechanisms behind supercontinent cycles and the long term evolution of the mantle. However, previous compilations have stopped short of mapping the locations of rifts and subduction zones continuously since the Neoproterozoic and within a self-consistent plate kinematic framework. Using recently published plate models with continuously closing boundaries for the Neoproterozoic and Phanerozoic, we estimate how rift and peri-continental subduction length vary from 1 Ga to present and test hypotheses pertaining to the supercontinent cycle and supercontinent breakup. We extract measures of continental perimeter-to-area ratio as a proxy for the existence of a supercontinent, where during times of supercontinent existence the perimeter-to-area ratio should be low, and during assembly and dispersal it should be high. The amalgamation of Gondwana is clearly represented by changes in the length of peri-continental subduction and the breakup of Rodinia and Pangea by changes in rift lengths. The assembly of Pangea is not clearly defined using plate boundary lengths, likely because its formation resulted from the collision of only two large continents. Instead the assembly of Gondwana (ca. 520 Ma) marks the most prominent change in arc length and perimeter-to-area ratio during the last billion years suggesting that Gondwana during the Early Palaeozoic could explicitly be considered part of a Phanerozoic supercontinent. Consequently, the traditional understanding of the supercontinent cycle, in terms of supercontinent existence for short periods of time before dispersal and re-accretion, may be inadequate to fully describe the cycle. Instead, either a two-stage supercontinent cycle could be a more appropriate concept, or alternatively the time period of 1 to 0 Ga has to be considered as being dominated by supercontinent existence, with brief periods of dispersal and amalgamation. Highlights • Compilation of rifting events in the Neoproterozoic • Analysis of continental arc, continental rift and connectedness of continental lithosphere for the last 1 Ga • Two stage supercontinent cycle may better explain changes in the connectedness of continental lithosphere • Extraversion and introversion models of successive supercontinents occur on different timescales [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Global & Planetary Change is the property of Elsevier B.V. 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.gloplacha.2018.11.006 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 1 Subjects: – SubjectFull: Rifts (Geology) Type: general – SubjectFull: Geographic boundaries Type: general – SubjectFull: Supercontinent cycles Type: general – SubjectFull: Earth's mantle Type: general – SubjectFull: Land consolidation Type: general Titles: – TitleFull: Rift and plate boundary evolution across two supercontinent cycles. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Merdith, Andrew S. – PersonEntity: Name: NameFull: Williams, Simon E. – PersonEntity: Name: NameFull: Brune, Sascha – PersonEntity: Name: NameFull: Collins, Alan S. – PersonEntity: Name: NameFull: Müller, R. Dietmar IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 09218181 Numbering: – Type: volume Value: 173 Titles: – TitleFull: Global & Planetary Change Type: main |
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