A-type granitoids from the Eastern Pontides, NE Turkey: Records for generation of hybrid A-type rocks in a subduction-related environment

A-type granitoids from the Eastern Pontides, NE Turkey: Records for generation of hybrid A-type rocks in a subduction-related environment

The Eastern Pontides is characterized by the many of intrusive bodies formed throughout the late Mesozoic–early Cenozoic. Most of these are I-type granitoids, but here, we present for the first time an A-type pluton from the region to assess source characteristics and geodynamic implications. The A-...

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Veröffentlicht in:Tectonophysics 2012-03, Vol.530-531, p.208-224
Hauptverfasser: Karsli, Orhan, Caran, Şemsettin, Dokuz, Abdurrahman, Çoban, Hakan, Chen, Bin, Kandemir, Raif
Format: Artikel
Sprache:eng
Schlagworte:
Back-arc extension
Eastern Pontides, NE Turkey
Enrichment
Gallium
Hybrid A-type granitoid
Lower crustal melting
Magma
Mantle
Melting
Melts
Rocks
Strontium
Subcontinental lithospheric mantle
Subduction
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Beschreibung
Zusammenfassung:The Eastern Pontides is characterized by the many of intrusive bodies formed throughout the late Mesozoic–early Cenozoic. Most of these are I-type granitoids, but here, we present for the first time an A-type pluton from the region to assess source characteristics and geodynamic implications. The A-type Pirnalli pluton has a SHRIMP zircon U–Pb age of 81.2±1Ma. It is composed of granite, syenite and quartz monzonite, and its enclaves are monzonitic in composition with elevated Ga/Al ratios and low Mg# (
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2011.12.030