Oxygen isotope compositions and magmatic epidote ... - Springer Link
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Oxygen isotope compositions and magmatic epidote ... - Springer Link
Oxygen isotope compositions and magmatic epidote from two contrasting metaluminous granitoids, NE Brazil. Received: 22 April 2002 / Accepted: 3 December ...
Contrib Mineral Petrol (2003) 145: 205–216 DOI 10.1007/s00410-003-0443-4
O R I GI N A L P A P E R
V. P. Ferreira Æ J. W. Valley Æ A. N. Sial M. J. Spicuzza
Oxygen isotope compositions and magmatic epidote from two contrasting metaluminous granitoids, NE Brazil
Received: 22 April 2002 / Accepted: 3 December 2002 / Published online: 12 March 2003 Springer-Verlag 2003
Abstract Oxygen isotope compositions of mineral separates were determined from two metaluminous granitoids (Emas and Sa˜o Rafael plutons) from northeastern Brazil. The I-type Emas pluton has high d18O (WR) values (11.5–11.8&), whereas the Sa˜o Rafael pluton has low d18O (WR) values (7.5–8.1&), but Sr and Nd are characteristics of S-type granitoids. Measured mineral– mineral fractionations suggest continuous sub-solidus inter-mineral isotope exchange among all minerals except zircon. There is a large and consistent quartz–epidote fractionation that gives apparent temperatures that are much lower than anticipated closure temperatures for epidote. Oxygen isotope fractionation between natural zircon and magmatic epidote is opposite to that predicted from theoretical determinations, as d18O (epidote)
