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Relations between metamorphism and orogeny in a typical section of the Indian Himalayas

NW-Himalaya: S-Lahul, Kulu; Himachal Prandesh; first comprehensive report
  • W. Frank
  • G. Hoinkes
  • Christine Miller
  • F. Purtscheller
  • W. Richter
  • M. Thöni
Article

Summary

A comprehensive geological and petrological investigation has been undertaken in an area of about 10 000 km2 in the Indian Himalaya (S-Lahul, Himachal Pradesh). The development of mineral assemblages in metamorphic rocks of medium grade is considered to be a dominant Alpine event, although almost exclusively Paleozoic and Precambrian rocks have been involved. The Barrowian type of this metamorphism, ranging from the anchi- to the sillimanite zone, took place under the elavated T-gradient of about 4°C/100 m. It is suggested that “normal” geothermal conditions prevailed only in the outermost zone of this orogenic belt. In the Late Tertiary this metamorphic series has been moved as a huge nappe upon the Lower Himalaya. During this process a unique feature of reverse metamorphism has been formed. It can be shown that this feature was caused by a combination of metamorphism and very rapid tectonic movements.

Keywords

Metamorphic Rock Orogenic Belt Mineral Assemblage Orogeny Tectonic Movement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Beziehungen zwischen Metamorphose und Orogenese in einem typischen Querschnitt des Indischen Himalaya

Zusammenfassung

Ein etwa 10 000 km2 großes Gebiet des Indischen Himalaya (S-Lahul, Himachal Pradesh) wurde einer umfassenden geologischen und petrographischen Bearbeitung unterzogen. Die Ausbildung der in den mittelgradig metamorphen Gesteinen vorliegenden Mineralparagenesen wird als ein dominant alpines Ereignis betrachtet, obwohl fast nur paläozoische und präkambrische Gesteine einbezogen wurden. Die Metamorphose selbst ist von Barrow-Typus und reicht von der Anchi- bis zur Sillimanitzone. Sie fand unter einem erhöhten Temperaturgradienten von etwa 4°C/100 m statt. Nur in der äußersten Zone des Orogens entsprach der Gradient etwa normalen geothermischen Verhältnissen. Im Spättertiär wurde diese alpin-metamorphe Serie in Form einer mächtigen Kristallindecke dem Niedrigen Himalaya aufgeschoben. Dabei wurde eine einzigartige Zone inverser Metamorphose ausgebildet. Es konnte gezeigt werden, daß diese inverse Metamorphose durch das Zusammenwirken von Metamorphose und sehr rasch ablaufender Tektonik entstand.

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Copyright information

© Springer-Verlag 1973

Authors and Affiliations

  • W. Frank
    • 1
    • 2
    • 3
  • G. Hoinkes
    • 1
    • 2
    • 3
  • Christine Miller
    • 1
    • 2
    • 3
  • F. Purtscheller
    • 1
    • 2
    • 3
  • W. Richter
    • 1
    • 2
    • 3
  • M. Thöni
    • 1
    • 2
    • 3
  1. 1.Geologisches InstitutUniversität WienWienAustria
  2. 2.Mineralogisch-petrographisches InstitutUniversität WienWienAustria
  3. 3.Mineralogisch-petrographisches InstitutUniversität InnsbruckInnsbruckAustria

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