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Construction of the granitoid crust of an island arc part I: geochronological and geochemical constraints from the plutonic Kohistan (NW Pakistan)

  • Oliver E. Jagoutz
  • J.-P. Burg
  • S. Hussain
  • H. Dawood
  • T. Pettke
  • T. Iizuka
  • S. Maruyama
Original Paper

Abstract

We present major and trace element analyses and U–Pb zircon intrusion ages from I-type granitoids sampled along a crustal transect in the vicinity of the Chilas gabbronorite of the Kohistan paleo-arc. The aim is to investigate the roles of fractional crystallization of mantle-derived melts and partial melting of lower crustal amphibolites to produce the magmatic upper crust of an island arc. The analyzed samples span a wide calc-alkaline compositional range (diorite–tonalite–granodiorite–granite) and have typical subduction-related trace element signatures. Their intrusion ages (75.1 ± 4.5–42.1 ± 4.4 Ma) are younger than the Chilas Complex (~85 Ma). The new results indicate, in conjunction with literature data, that granitoid formation in the Kohistan arc was a continuous rather than punctuated process. Field observations and the presence of inherited zircons indicate the importance of assimilation processes. Field relations, petrographic observations and major and trace element compositions of the granitoid indicate the importance of amphibole fractionation for their origin. It is concluded that granitoids in the Kohistan arc are derivative products of mantle derived melts that evolved through amphibole-dominated fractionation and intra crustal assimilation.

Keywords

Partial Melting Continental Crust Lower Crust Fractional Crystallization Incompatible Trace Element 
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.

Notes

Acknowledgments

The Swiss National Science Foundation supported OJ`s and JPB`s work (grants NF 20-49372.96 and NF 20-61465.00). OJ thanks the hospitality of the Tokyo Institute of Technology for support during an extended visit supported by Tokyo Tech Award of ETH Zurich. Discussion with Othmar Müntener, Matt Rioux and Tim Grove are highly appreciated. Extremely helpful, detailed reviews by Tom Sisson and an anonymous reviewer greatly clarified and improved the paper.

Supplementary material

410_2009_408_MOESM1_ESM.xls (5.1 mb)
Supplemenatary Table (XLS 5.10 MB)
410_2009_408_MOESM2_ESM.doc (58 kb)
Supplementary material (DOC 58 kb)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Oliver E. Jagoutz
    • 1
    • 2
  • J.-P. Burg
    • 1
  • S. Hussain
    • 3
  • H. Dawood
    • 3
  • T. Pettke
    • 4
  • T. Iizuka
    • 5
  • S. Maruyama
    • 6
  1. 1.Department of Earth SciencesETH and University ZurichZurichSwitzerland
  2. 2.Department of Earth, Atmospheric, and Planetary SciencesMassachusetts Institute of TechnologyCambridgeUSA
  3. 3.Pakistan Museum of Natural HistoryIslamabadPakistan
  4. 4.Department of Earth SciencesUniversity of BernBernSwitzerland
  5. 5.Research School of Earth SciencesThe Australian National UniversityCanberraAustralia
  6. 6.Department of Earth and Planetary SciencesTokyo Institute of TechnologyTokyoJapan

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