The origin of changes in structural style across the Bandar Abbas syntaxis, SE Zagros (Iran)
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| Title: | The origin of changes in structural style across the Bandar Abbas syntaxis, SE Zagros (Iran) |
|---|---|
| Authors: | Molinaro, M.1 matteo.molinaro@geol.u-cergy.fr, Guezou, J.C.1, Leturmy, P.1, Eshraghi, S.A.2, de Lamotte, D. Frizon1 |
| Source: | Marine & Petroleum Geology. Jun2004, Vol. 21 Issue 6, p735-752. 18p. |
| Subjects: | Seismology, Geometry, Geophysics |
| Geographic Terms: | Oman |
| Abstract: | The Bandar Abbas syntaxis marks the transition between the Zagros collisional belt and the Makran subduction-related prism and constitutes a major structural feature within the Alpine–Himalayan mountain belt. Within the foreland part of the Zagros (the Zagros Fold Thrust Belt, ZFTB), the transition is marked by a sudden change in structural trends and style and a rapid decrease in seismicity and salt diapirism from west to east of the syntaxis. The depth to decollement and lithology affect the geometry and size of the folds on each side of the syntaxis, while different mechanical coupling along the basal decollement affects the degree of internal rock deformation. Thus the short and broad folds of the western side of the syntaxis are decoupled along the 8-km deep Hormuz evaporites, visible at surface in numerous salt diapirs. Strong seismicity in this area suggests that the basement is involved in the deformation. By contrast, the long and narrow folds of the eastern side of the syntaxis appear to be controlled by frictional slip along a 6-km deep detachment. The absence of seismicity suggests that the basement is not involved in the deformation in this area. We propose that the basal decollement for these structures corresponds to the eroded top of the NNE–SSW trending Oman Mesozoic nappes resulting from Late Cretaceous obduction of Tethys on the Arabian margin. These structures are visible onshore in the northern tip of the Oman peninsula and seen in offshore seismic profiles continuing northward beneath the Strait of Hormuz. Finally, map view observations show that the Main Zagros Thrust and the Zendan Fault—separating the ZFTB from the internal zones of the orogen—are shallow low angle thrust faults rather than steeply dipping faults. [Copyright &y& Elsevier] |
| Copyright of Marine & Petroleum Geology 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: 13623444 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The origin of changes in structural style across the Bandar Abbas syntaxis, SE Zagros (Iran) – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Molinaro%2C+M%2E%22">Molinaro, M.</searchLink><relatesTo>1</relatesTo><i> matteo.molinaro@geol.u-cergy.fr</i><br /><searchLink fieldCode="AR" term="%22Guezou%2C+J%2EC%2E%22">Guezou, J.C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Leturmy%2C+P%2E%22">Leturmy, P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Eshraghi%2C+S%2EA%2E%22">Eshraghi, S.A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22de+Lamotte%2C+D%2E+Frizon%22">de Lamotte, D. Frizon</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Marine+%26+Petroleum+Geology%22">Marine & Petroleum Geology</searchLink>. Jun2004, Vol. 21 Issue 6, p735-752. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Seismology%22">Seismology</searchLink><br /><searchLink fieldCode="DE" term="%22Geometry%22">Geometry</searchLink><br /><searchLink fieldCode="DE" term="%22Geophysics%22">Geophysics</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Oman%22">Oman</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Bandar Abbas syntaxis marks the transition between the Zagros collisional belt and the Makran subduction-related prism and constitutes a major structural feature within the Alpine–Himalayan mountain belt. Within the foreland part of the Zagros (the Zagros Fold Thrust Belt, ZFTB), the transition is marked by a sudden change in structural trends and style and a rapid decrease in seismicity and salt diapirism from west to east of the syntaxis. The depth to decollement and lithology affect the geometry and size of the folds on each side of the syntaxis, while different mechanical coupling along the basal decollement affects the degree of internal rock deformation. Thus the short and broad folds of the western side of the syntaxis are decoupled along the 8-km deep Hormuz evaporites, visible at surface in numerous salt diapirs. Strong seismicity in this area suggests that the basement is involved in the deformation. By contrast, the long and narrow folds of the eastern side of the syntaxis appear to be controlled by frictional slip along a 6-km deep detachment. The absence of seismicity suggests that the basement is not involved in the deformation in this area. We propose that the basal decollement for these structures corresponds to the eroded top of the NNE–SSW trending Oman Mesozoic nappes resulting from Late Cretaceous obduction of Tethys on the Arabian margin. These structures are visible onshore in the northern tip of the Oman peninsula and seen in offshore seismic profiles continuing northward beneath the Strait of Hormuz. Finally, map view observations show that the Main Zagros Thrust and the Zendan Fault—separating the ZFTB from the internal zones of the orogen—are shallow low angle thrust faults rather than steeply dipping faults. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Marine & Petroleum Geology 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.marpetgeo.2004.04.001 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 735 Subjects: – SubjectFull: Seismology Type: general – SubjectFull: Geometry Type: general – SubjectFull: Geophysics Type: general – SubjectFull: Oman Type: general Titles: – TitleFull: The origin of changes in structural style across the Bandar Abbas syntaxis, SE Zagros (Iran) Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Molinaro, M. – PersonEntity: Name: NameFull: Guezou, J.C. – PersonEntity: Name: NameFull: Leturmy, P. – PersonEntity: Name: NameFull: Eshraghi, S.A. – PersonEntity: Name: NameFull: de Lamotte, D. Frizon IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2004 Type: published Y: 2004 Identifiers: – Type: issn-print Value: 02648172 Numbering: – Type: volume Value: 21 – Type: issue Value: 6 Titles: – TitleFull: Marine & Petroleum Geology Type: main |
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