Thermal structure of a major crustal shear zone, the basal thrust in the Scandinavian Caledonides.
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| Title: | Thermal structure of a major crustal shear zone, the basal thrust in the Scandinavian Caledonides. |
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| Authors: | Fauconnier, J.1,2, Labrousse, L.1,2, Andersen, T.B.3, Beyssac, O.4, Duprat-Oualid, S.5, Yamato, P.5 |
| Source: | Earth & Planetary Science Letters. Jan2014, Vol. 385, p162-171. 10p. |
| Subjects: | Shear zones, Collisions (Physics), Orogenic belts, Raman spectroscopy, Thrust faults (Geology), Carbonaceous chondrites (Meteorites) |
| Abstract: | Crustal-scale thrust zones accommodate most of the horizontal shortening at the front of orogenic wedges. Their thermal state is a key feature of collision zones, depending on critical parameters such as thrust rate or initial thermal properties of involved lithosphere units. We present here the first direct imaging of the thermal envelope of such a thrust zone: the Jotun Basal Thrust (JBT) in the Scandinavian Caledonides, through Raman Spectroscopy of Carbonaceous Material in the alum shales, an organic carbon-rich unit of Cambro-Ordovician age along which the basal decollement of the JBT developed. Maximum temperature mapping within this unit shows isotherms grading from ∼320 °C in the south–east to ∼500 °C in the north–west in the trailing end of the nappe stack. Based on bt + chl + grt + ph equilibrium, we estimate that the trailing end reached a temperature of 500 °C at pressure. 2-D thermo-kinematic modelling constrained with these new natural data and timing considerations for the Scandian collision indicates that (1) peak temperature mainly reflects maximum burial stage, (2) thrust rate and dip angle must have been low for the JBT and (3) the Scandinavian Caledonides represent a relatively cold orogenic wedge compared to other orogens. [ABSTRACT FROM AUTHOR] |
| Copyright of Earth & Planetary Science Letters 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: 92654567 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Thermal structure of a major crustal shear zone, the basal thrust in the Scandinavian Caledonides. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Fauconnier%2C+J%2E%22">Fauconnier, J.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Labrousse%2C+L%2E%22">Labrousse, L.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Andersen%2C+T%2EB%2E%22">Andersen, T.B.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Beyssac%2C+O%2E%22">Beyssac, O.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Duprat-Oualid%2C+S%2E%22">Duprat-Oualid, S.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Yamato%2C+P%2E%22">Yamato, P.</searchLink><relatesTo>5</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Earth+%26+Planetary+Science+Letters%22">Earth & Planetary Science Letters</searchLink>. Jan2014, Vol. 385, p162-171. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Shear+zones%22">Shear zones</searchLink><br /><searchLink fieldCode="DE" term="%22Collisions+%28Physics%29%22">Collisions (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Orogenic+belts%22">Orogenic belts</searchLink><br /><searchLink fieldCode="DE" term="%22Raman+spectroscopy%22">Raman spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Thrust+faults+%28Geology%29%22">Thrust faults (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonaceous+chondrites+%28Meteorites%29%22">Carbonaceous chondrites (Meteorites)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Crustal-scale thrust zones accommodate most of the horizontal shortening at the front of orogenic wedges. Their thermal state is a key feature of collision zones, depending on critical parameters such as thrust rate or initial thermal properties of involved lithosphere units. We present here the first direct imaging of the thermal envelope of such a thrust zone: the Jotun Basal Thrust (JBT) in the Scandinavian Caledonides, through Raman Spectroscopy of Carbonaceous Material in the alum shales, an organic carbon-rich unit of Cambro-Ordovician age along which the basal decollement of the JBT developed. Maximum temperature mapping within this unit shows isotherms grading from ∼320 °C in the south–east to ∼500 °C in the north–west in the trailing end of the nappe stack. Based on bt + chl + grt + ph equilibrium, we estimate that the trailing end reached a temperature of 500 °C at pressure. 2-D thermo-kinematic modelling constrained with these new natural data and timing considerations for the Scandian collision indicates that (1) peak temperature mainly reflects maximum burial stage, (2) thrust rate and dip angle must have been low for the JBT and (3) the Scandinavian Caledonides represent a relatively cold orogenic wedge compared to other orogens. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Earth & Planetary Science Letters 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.epsl.2013.10.038 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 162 Subjects: – SubjectFull: Shear zones Type: general – SubjectFull: Collisions (Physics) Type: general – SubjectFull: Orogenic belts Type: general – SubjectFull: Raman spectroscopy Type: general – SubjectFull: Thrust faults (Geology) Type: general – SubjectFull: Carbonaceous chondrites (Meteorites) Type: general Titles: – TitleFull: Thermal structure of a major crustal shear zone, the basal thrust in the Scandinavian Caledonides. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Fauconnier, J. – PersonEntity: Name: NameFull: Labrousse, L. – PersonEntity: Name: NameFull: Andersen, T.B. – PersonEntity: Name: NameFull: Beyssac, O. – PersonEntity: Name: NameFull: Duprat-Oualid, S. – PersonEntity: Name: NameFull: Yamato, P. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2014 Type: published Y: 2014 Identifiers: – Type: issn-print Value: 0012821X Numbering: – Type: volume Value: 385 Titles: – TitleFull: Earth & Planetary Science Letters Type: main |
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