· web viewsupplementary information jorge kazuo yamamoto1, thomas rich fairchild1, paulo cesar...
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A RECORD OF PERMIAN SUBAQUEOUS VENT ACTIVITY IN SOUTHEASTERN
BRAZIL
Supplementary Information
Jorge Kazuo Yamamoto1, Thomas Rich Fairchild1, Paulo Cesar Boggiani1, Tarcísio
Jose Montanheiro2, Carlos César de Araújo3, Pedro Kunihiko Kiyohara4, Sergio Luis Fabris
de Matos1, Paulo César Soares5
1 Department of Environmental and Sedimentary Geology, Institute of Geosciences,
University of São Paulo. e-mail: [email protected], [email protected],
[email protected], [email protected]
2 Geological Institute, State Secretary of Environment, State of São Paulo. e-mail:
3 PETROBRAS S.A. e-mail: [email protected]
4 Department of General Physics, Institute of Physics, University of São Paulo. e-
mail: [email protected]
5 Department of Geology, Federal University of Paraná. e-mail:
Summary: This file contains two photomicrographs of petrographic thin sections of
chert from a siliceous cone in the Teresina Formation (Permian), Anhembi, Brazil,
showing textural details of the various types of silica. ( Download Word file 4.85 MB).
Figure S1: Photomicrograph (crossed nichols) of petrographic thin section of chert
from wall of siliceous cone (Teresina Formation, Permian, Anhembi, Brazil), showing
cryptocrystalline quartz with distinct salt-and-pepper extinction pattern.
Figure S2: Photomicrograph (crossed nicols) of petrographic thin section of void-
filling silica phases in chert from wall of siliceous cone (Teresina Formation, Permian,
Anhembi, Brazil). Note salt-and-pepper extinction pattern of micro- to cryptocrystalline
quartz and radial-fibrous length-fast chalcedony and megaquartz occluding an original
void. This trend is also seen macroscopically as botryoidal surfaces and radiating coarse
quartz crystals that partially fill large vesicles in the walls of the cones.