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Mafic rocks from the Ryoke Belt, southwest Japan: implications for Cretaceous Ryoke/San-yo granitic magma genesis

Nakajima, Takashi; Kamiyama, Hiroyuki; Williams, Ian; Tani, Kenichiro


Mafic rocks in the Ryoke belt, the Cretaceous granitic province in Southwest Japan, occur in two modes: (1) as mafic dykes and pillow-shaped enclaves, and (2) as isolated kilometre-sized bodies of gabbroic cumulate. The dykes and pillows have fine-grained textures with thin radiating plagioclase laths, indicative of quenching. The gabbroic cumulates are predominantly coarse-grained and commonly lithologically layered. SHRIMP zircon U-Pb ages of both types of mafic rocks are in th e range 71-86...[Show more]

CollectionsANU Research Publications
Date published: 2005
Type: Journal article
Source: Transactions of the Royal Society of Edinburgh: Earth Sciences


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