Burial metamorphism in rocks of the Western Andes of Peru |
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| Authors: | R Offler L Aguirre B Levi S Child |
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| Institution: | 1. R. Offler, Department of Geology, The University of Newcastle, N.S.W. 2308, Australia;2. L. Aguirre, Department of Geology, The University of Liverpool, Liverpool, L69 3BX, U.K.;3. B. Levi, Geologiska Institutionen, Stockholms Universitet, Stockholm, Sweden;4. S. Child, Yew Tree Cottage, Millend, Nr. Newland, Coleford, Glos., U.K. |
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| Abstract: | An unconformity bound, episodic pattern of burial metamorphism is preserved in marine and terrestrial volcanic and sedimentary rocks which were deposited in the West Peruvian Trough during the Mesozoic and Cenozoic Eras. A particular metamorphic facies series is developed in each of the stratigraphic-structural units bounded by unconformities. In each unit, grade increases with stratigraphic depth and covers part or all of the range from zeolite to greenschist facies. At every unconformity a mineralogic break occurs where higher grade assemblages on top of the unconformity plane overlie lower grade assemblages. The presence of wairakite and the development of a wide range of metamorphic facies in thin sequences suggest high geothermal gradients, possibly related to generation of magma at depth. |
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