Abstract
The isotopic compositions of Sr and Nd were analyzed for sixteen samples of allanite-(Ce) from Mesozoic–Cenozoic granitic rocks in Japan (11 samples of an Mn-rich type, and five samples of an Mn-poor type). The Mn-rich allanite-(Ce) crystals have an initial 87Sr/86Sr value in the range 0.70811–0.71398 and an initial 143Nd/144Nd value in the range 0.512148–0.512471, whereas for crystals of Mn-poor allanite-(Ce), the analogous intervals are 0.70499–0.70704 and 0.512547–0.512606. There is a negative correlation between 87Sr/86Sr and 143Nd/144Nd values. The trend of these isotopic data for Mn-rich and Mn-poor allanite-(Ce) is parallel to that for ilmenite- and magnetite-series granitic rocks from Japan, respectively. This parallelism suggests that the genesis of these two groups of allanite-(Ce) is related to that of ilmenite-series and magnetite-series granitic rocks. The characteristics of allanite-(Ce) can shed light on the petrogenesis of granitic rocks.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
