Abstract
We present U-Pb zircon crystallization ages combined with major and trace element analyses, Sr-Nd isotopes and zircon in-situ Hf isotope analyses of intermediate to granitic intrusions along the southern segment of the N-S trending Sistan suture zone in eastern Iran. The Zahedan and Shah-Kuh Eocene plutons consist in a series of granite-granodiorite-rhyolite with U-Pb zircon ages of 40.5-44.3 Ma and ca. 28.9-30.9 Ma. Isotope geochemistry and modeling suggest that 40.5-44.3 Ma plutons represent melts derived from the turbidites of the surrounding accretionary wedge. Melting of the wedge was induced by the intrusion of mantle magmas, with subsequent interaction between mantle- and turbiditic melts being responsible for the wide range of compositions. Most of the 28.9-30.9 Ma magmas were generated from mantle melting, with assimilation of the surrounding turbidites. The rare setting of within-wedge intrusions is attributed to mantle upwelling reaching wedge sediments at the inception of delamination processes, which signal the end of subduction-related deformational and thermal events in the Sistan suture zone.
Original language | English |
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Pages (from-to) | 293-308 |
Number of pages | 16 |
Journal | Lithos |
Volume | 248-251 |
DOIs | |
Publication status | Published - 1 Apr 2016 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2016 Elsevier B.V.
Keywords
- Geochemistry
- Sistan suture zone
- Turbidites
- U-Pb geochronology
- Zahedan and Shah Kuh granitoids