Evidence of Early to Middle Ordovician arc volcanism in the
Cordillera Oriental and Altiplano of southern Peru,
Ollantaytambo Formation and Umachiri beds
Heinrich Bahlburg a,*, Victor Carlotto b
, Jose´ Ca´rdenas c
a
Geologisch-Pala¨ontologisches...
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Evidence of Early to Middle Ordovician arc volcanism in the
Cordillera Oriental and Altiplano of southern Peru,
Ollantaytambo Formation and Umachiri beds
Heinrich Bahlburg a,*, Victor Carlotto b
, Jose´ Ca´rdenas c
a
Geologisch-Pala¨ontologisches Institut, Westfa¨lische Wilhelms-Universita¨t, Corrensstrasse 24, 48149 Mu¨nster, Germany
b
INGEMMET, Av.
Canada´ 1470, Lima, Peru
c
Departamento Acade´mico de Geologı´a, Universidad San Antonio Abad del Cusco, Cusco, Peru
Received 1 April 2005; accepted 1 May 2006
Abstract
Volcanic rocks of intermediate to predominantly mafic composition are exposed in the Cordillera Oriental and Altiplano of southern
Peru in two localities: (1) the Ollantaytambo Formation, which crops out near Cusco, and (2) the Umachiri beds in the Departamento de
Puno.
The most notable unit in the Ollantaytambo Formation is an approximately 100 m thick succession of lapilli tuffs that originated
by hydroclastic fragmentation.
These volcanic rocks are of
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