Mesoproterozoic-trans-Laurentian magmatism: A synthesis of continent-wide age distributions, new SIMS U–Pb ages, zircon saturation temperatures, and Hf and Nd isotopic compositions

M E Bickford,W R Van Schmus,K E Karlstrom,Paul A Mueller,George D Kamenov

Precambrian Research（2015）

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摘要

•A-type magmatism across southern Laurentia between 1480 and 1340Ma.•Change from crustal to more juvenile source across “Nd line”.•Magma temperatures mostly greater than 850°C.•Granite–rhyolite assemblages formed in broad intracratonic extensional setting inboard of convergent or transform margin.

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关键词

Mesoproterozoic,Ferroan granites,Rhyolites,Zircons,Hf isotopes,Nd isotopes

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