Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
International Geology Review, Vol. 49, 2007, p. 10691093. Copyright 2007 by V. H. Winston & Son, Inc. All rights reserved.
 

Summary: 1069
International Geology Review, Vol. 49, 2007, p. 10691093.
Copyright 2007 by V. H. Winston & Son, Inc. All rights reserved.
0020-6814/07/965/1069-25 $25.00
Petrogenesis of UHP Eclogite from the Cuaba Gneiss,
Rio San Juan Complex, Dominican Republic
RICHARD N. ABBOTT, JR.1
Department of Geology, Appalachian State University, Boone, North Carolina 28608
AND GRENVILLE DRAPER
Department of Earth Sciences, Florida International University, Miami, Florida 33199
Abstract
Ultrahigh-pressure (UHP) conditions were established for the Cuaba Gneiss terrane, northern
Dominican Republic, on the basis of phase relationships in garnet-bearing ultramafic rock, a rela-
tively minor constituent of the terrane. Evidence for much more abundant eclogite comes in the form
of two types of symplectic intergrowths involving, respectively, Pl + Cpx (Sym-I) and Pl + Ep (Sym-
II), interpreted as the products of the decomposition of two types of omphacite, respectively, Omp-I
and Omp-II. Sym-II (hence Omp-II) forms mantles on garnet and aggregates of epidote. Otherwise,
estimated P-T conditions for the mineral assemblage Grt + Pl + Cpx + Ep + Hbl + Qtz are consistent
with upper amphibolite-facies (P ~1.2 GPa, T ~750C). Thus far, the retrograded eclogite has
revealed nothing diagnostic of UHP conditions--e.g., coesite, evidence for coesite (radiating micro

  

Source: Abbott Jr., Richard N. - Department of Geology, Appalachian State University

 

Collections: Geosciences