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Mid‐Miocene initiation of E‐W extension and recoupling of the Himalaya.

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Title: Mid‐Miocene initiation of E‐W extension and recoupling of the Himalaya.
Authors: Larson, Kyle P.1 (AUTHOR) kyle.larson@ubc.ca, Kellett, Dawn A.2 (AUTHOR), Cottle, John M.3 (AUTHOR), Camacho, Alfredo4 (AUTHOR), Brubacher, Alex D.1 (AUTHOR)
Source: Terra Nova. Apr2020, Vol. 32 Issue 2, p151-158. 8p. 3 Diagrams, 1 Chart, 1 Graph, 1 Map.
Subjects: Plateaus, Kinematics, Zircon
Geographic Terms: Nepal, Himalaya Mountains
Abstract: The Tibetan plateau is host to numerous ~N‐S striking graben that have accommodated E‐W directed extension. The development of these structures has been interpreted to reflect a variety of different geological processes including plateau collapse, oroclinal bending or mid‐to‐lower crustal flow. New 40Ar/39Ar thermochronology and quartz c‐axis data from the Thakkhola graben of west‐central Nepal show that E‐W extension was ongoing at least locally by the early Miocene (ca. 17 Ma). Our new, and previously published chronologic information on the initiation of graben across the orogen shows that they typically developed immediately after cessation of the South Tibetan detachment system, a structural network that facilitated differential southward movement of the upper and middle crust. We interpret this fundamental switch in orogen kinematics to reflect recoupling of the middle and upper Himalayan crust such that the subsequent widespread flow of the mid‐to‐lower crust out of the system to the east forced brittle accommodation in the upper crust. [ABSTRACT FROM AUTHOR]
Copyright of Terra Nova is the property of Wiley-Blackwell 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: 142124495
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Mid‐Miocene initiation of E‐W extension and recoupling of the Himalaya.
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  Data: <searchLink fieldCode="JN" term="%22Terra+Nova%22">Terra Nova</searchLink>. Apr2020, Vol. 32 Issue 2, p151-158. 8p. 3 Diagrams, 1 Chart, 1 Graph, 1 Map.
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  Data: <searchLink fieldCode="DE" term="%22Plateaus%22">Plateaus</searchLink><br /><searchLink fieldCode="DE" term="%22Kinematics%22">Kinematics</searchLink><br /><searchLink fieldCode="DE" term="%22Zircon%22">Zircon</searchLink>
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  Data: The Tibetan plateau is host to numerous ~N‐S striking graben that have accommodated E‐W directed extension. The development of these structures has been interpreted to reflect a variety of different geological processes including plateau collapse, oroclinal bending or mid‐to‐lower crustal flow. New 40Ar/39Ar thermochronology and quartz c‐axis data from the Thakkhola graben of west‐central Nepal show that E‐W extension was ongoing at least locally by the early Miocene (ca. 17 Ma). Our new, and previously published chronologic information on the initiation of graben across the orogen shows that they typically developed immediately after cessation of the South Tibetan detachment system, a structural network that facilitated differential southward movement of the upper and middle crust. We interpret this fundamental switch in orogen kinematics to reflect recoupling of the middle and upper Himalayan crust such that the subsequent widespread flow of the mid‐to‐lower crust out of the system to the east forced brittle accommodation in the upper crust. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Terra Nova is the property of Wiley-Blackwell 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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        Value: 10.1111/ter.12443
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      – Code: eng
        Text: English
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      – SubjectFull: Plateaus
        Type: general
      – SubjectFull: Kinematics
        Type: general
      – SubjectFull: Zircon
        Type: general
      – SubjectFull: Nepal
        Type: general
      – SubjectFull: Himalaya Mountains
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              Text: Apr2020
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              Y: 2020
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