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]
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