Age and Geochemical Character of Granite and Syenite Plutons in the Grenville Province of Southeastern Ontario; Insights into Magmatism During the Ottawan Orogeny and Evidence of the Frontenac Intrusive Suite in the Sharbot Lake Domain
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Age and Geochemical Character of Granite and Syenite Plutons in the Grenville Province of Southeastern Ontario; Insights into Magmatism During the Ottawan Orogeny and Evidence of the Frontenac Intrusive Suite in the Sharbot Lake DomainKeywords:
Orogeny
The Dongjiangkou granitic pluton is exposed in the South Qinling terrain between the Shang-Dan and the Mian-Lue suture zones.This granitic pluton generally contains abundant mafic enclaves of different types.Results of zircon U-Pb dating for a granite and two mafic enclaves by using the LA-MC-ICPMS technique show that the Dongjiangkou granitic pluton crystallized in 223Ma and mafic enclaves formed simultaneously in 222Ma.This magmatism of early Mesozoic constrains the time of tectonic transformation from compression to extension in the Qinling orogenic belt.Hf isotopic composition of zircons obtained by the LA-MC-ICPMS technique suggests that the granitic pluton resulted from a mixing-mingling process between mantle-derived mafic magma and crustal-derived granitic magma.The mafic magma originated likely from depleted mantle,while basement rocks of the South Qinling(or Yangtze) terrain contributed major material source for the granitic pluton.This magmatic activity is attributed to lithospheric delamination during the post-orogenic stage of the Qinling orogenic belt.
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