Journal of Petrology | Volume 38 | Number 1 | Pages 65-83 | 1997
© Oxford University Press 1997
High-Pressure (
2000 MPa) Kyanite- and Glaucophane-bearing Pelitic Schist and Eclogite from Cordillera de la Costa Belt, Venezuela
Department of Geology and Geophysics, Rice University MS-126, Houston, TX 77005-1892, USA
Received April 22, 1996; Revised typescript accepted August 5, 1996
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Abstract |
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Cretaceous melange of the Cordillera de la Costa belt, north–central Venezuela, there are knockers of eclogite, barroisite-bearing eclogite, and pelitic glaucophane schist. These occur in a metamorphic melange matrix that locally consists of marble, serpentinite, amphibolite, actinolite schist, feldspathic schist and gneiss, graphitic schist, chloritoid schist, and garnet-bearing mica schist. The protoliths for these various rock types exhibit a wide age range (Cambrian to Early Cretaceous?). Recently discovered knockers of pelitic glaucophane schist contain Mg-glaucophane + paragonite + kyanite + garnet + talc + graphite + rutile + quartz. The coexistence of kyanite and Mg-glaucophane suggests minimum P 
2000 MPa at T > 600°C. Eclogite knockers from the same outcrop contain garnet and clinopyroxene which yield 500°C for cores, 700°C for rims, and P 
1200 MPa. The assemblage garnet–biotite–phengite–albite within schists of the melange matrix of this locality indicates metamorphic conditions of T = 450–520°C at P = 1800 MPa. Because all lithologies in this outcrop record high-P conditions, this metamorphic melange formed before or during peak metamorphism in a mid-Cretaceous subduction zone.
KEY WORDS: geothermobarometry; high-P pelitic schist; eclogite; Puerto Cabello; Venezuela
* Corresponding author. Telephone: (713) 285-5234 (O). Fax: (713) 285-5214. e-mail: jinnys{at}rice.edu
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